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FFmpeg/libavformat/mov.c
Justin Ruggles 1fdf18f4b7 mov: add support for reading and writing the 'chan' tag 
This implements reading the tag in the demuxer and adds support for writing it
in the muxer. Some example channel layout tables for muxing are included for
ac3, aac, and alac, but they are not utilized yet.
2011-12-09 16:12:58 -05:00

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/*
* MOV demuxer
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <limits.h>
//#define DEBUG
//#define MOV_EXPORT_ALL_METADATA
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat_readwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "riff.h"
#include "isom.h"
#include "libavcodec/get_bits.h"
#include "id3v1.h"
#include "mov_chan.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
/*
* First version by Francois Revol revol@free.fr
* Seek function by Gael Chardon gael.dev@4now.net
*/
#include "qtpalette.h"
#undef NDEBUG
#include <assert.h>
/* those functions parse an atom */
/* links atom IDs to parse functions */
typedef struct MOVParseTableEntry {
uint32_t type;
int (*parse)(MOVContext *ctx, AVIOContext *pb, MOVAtom atom);
} MOVParseTableEntry;
static const MOVParseTableEntry mov_default_parse_table[];
static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
unsigned len, const char *key)
{
char buf[16];
short current, total;
avio_rb16(pb); // unknown
current = avio_rb16(pb);
total = avio_rb16(pb);
if (!total)
snprintf(buf, sizeof(buf), "%d", current);
else
snprintf(buf, sizeof(buf), "%d/%d", current, total);
av_dict_set(&c->fc->metadata, key, buf, 0);
return 0;
}
static int mov_metadata_int8_bypass_padding(MOVContext *c, AVIOContext *pb,
unsigned len, const char *key)
{
char buf[16];
/* bypass padding bytes */
avio_r8(pb);
avio_r8(pb);
avio_r8(pb);
snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
av_dict_set(&c->fc->metadata, key, buf, 0);
return 0;
}
static int mov_metadata_int8_no_padding(MOVContext *c, AVIOContext *pb,
unsigned len, const char *key)
{
char buf[16];
snprintf(buf, sizeof(buf), "%d", avio_r8(pb));
av_dict_set(&c->fc->metadata, key, buf, 0);
return 0;
}
static int mov_metadata_gnre(MOVContext *c, AVIOContext *pb,
unsigned len, const char *key)
{
short genre;
char buf[20];
avio_r8(pb); // unknown
genre = avio_r8(pb);
if (genre < 1 || genre > ID3v1_GENRE_MAX)
return 0;
snprintf(buf, sizeof(buf), "%s", ff_id3v1_genre_str[genre-1]);
av_dict_set(&c->fc->metadata, key, buf, 0);
return 0;
}
static const uint32_t mac_to_unicode[128] = {
0x00C4,0x00C5,0x00C7,0x00C9,0x00D1,0x00D6,0x00DC,0x00E1,
0x00E0,0x00E2,0x00E4,0x00E3,0x00E5,0x00E7,0x00E9,0x00E8,
0x00EA,0x00EB,0x00ED,0x00EC,0x00EE,0x00EF,0x00F1,0x00F3,
0x00F2,0x00F4,0x00F6,0x00F5,0x00FA,0x00F9,0x00FB,0x00FC,
0x2020,0x00B0,0x00A2,0x00A3,0x00A7,0x2022,0x00B6,0x00DF,
0x00AE,0x00A9,0x2122,0x00B4,0x00A8,0x2260,0x00C6,0x00D8,
0x221E,0x00B1,0x2264,0x2265,0x00A5,0x00B5,0x2202,0x2211,
0x220F,0x03C0,0x222B,0x00AA,0x00BA,0x03A9,0x00E6,0x00F8,
0x00BF,0x00A1,0x00AC,0x221A,0x0192,0x2248,0x2206,0x00AB,
0x00BB,0x2026,0x00A0,0x00C0,0x00C3,0x00D5,0x0152,0x0153,
0x2013,0x2014,0x201C,0x201D,0x2018,0x2019,0x00F7,0x25CA,
0x00FF,0x0178,0x2044,0x20AC,0x2039,0x203A,0xFB01,0xFB02,
0x2021,0x00B7,0x201A,0x201E,0x2030,0x00C2,0x00CA,0x00C1,
0x00CB,0x00C8,0x00CD,0x00CE,0x00CF,0x00CC,0x00D3,0x00D4,
0xF8FF,0x00D2,0x00DA,0x00DB,0x00D9,0x0131,0x02C6,0x02DC,
0x00AF,0x02D8,0x02D9,0x02DA,0x00B8,0x02DD,0x02DB,0x02C7,
};
static int mov_read_mac_string(MOVContext *c, AVIOContext *pb, int len,
char *dst, int dstlen)
{
char *p = dst;
char *end = dst+dstlen-1;
int i;
for (i = 0; i < len; i++) {
uint8_t t, c = avio_r8(pb);
if (c < 0x80 && p < end)
*p++ = c;
else
PUT_UTF8(mac_to_unicode[c-0x80], t, if (p < end) *p++ = t;);
}
*p = 0;
return p - dst;
}
static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
#ifdef MOV_EXPORT_ALL_METADATA
char tmp_key[5];
#endif
char str[1024], key2[16], language[4] = {0};
const char *key = NULL;
uint16_t str_size, langcode = 0;
uint32_t data_type = 0;
int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;
switch (atom.type) {
case MKTAG(0xa9,'n','a','m'): key = "title"; break;
case MKTAG(0xa9,'a','u','t'):
case MKTAG(0xa9,'A','R','T'): key = "artist"; break;
case MKTAG( 'a','A','R','T'): key = "album_artist"; break;
case MKTAG(0xa9,'w','r','t'): key = "composer"; break;
case MKTAG( 'c','p','r','t'):
case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
case MKTAG(0xa9,'c','m','t'):
case MKTAG(0xa9,'i','n','f'): key = "comment"; break;
case MKTAG(0xa9,'a','l','b'): key = "album"; break;
case MKTAG(0xa9,'d','a','y'): key = "date"; break;
case MKTAG(0xa9,'g','e','n'): key = "genre"; break;
case MKTAG( 'g','n','r','e'): key = "genre";
parse = mov_metadata_gnre; break;
case MKTAG(0xa9,'t','o','o'):
case MKTAG(0xa9,'s','w','r'): key = "encoder"; break;
case MKTAG(0xa9,'e','n','c'): key = "encoder"; break;
case MKTAG( 'd','e','s','c'): key = "description";break;
case MKTAG( 'l','d','e','s'): key = "synopsis"; break;
case MKTAG( 't','v','s','h'): key = "show"; break;
case MKTAG( 't','v','e','n'): key = "episode_id";break;
case MKTAG( 't','v','n','n'): key = "network"; break;
case MKTAG( 't','r','k','n'): key = "track";
parse = mov_metadata_track_or_disc_number; break;
case MKTAG( 'd','i','s','k'): key = "disc";
parse = mov_metadata_track_or_disc_number; break;
case MKTAG( 't','v','e','s'): key = "episode_sort";
parse = mov_metadata_int8_bypass_padding; break;
case MKTAG( 't','v','s','n'): key = "season_number";
parse = mov_metadata_int8_bypass_padding; break;
case MKTAG( 's','t','i','k'): key = "media_type";
parse = mov_metadata_int8_no_padding; break;
case MKTAG( 'h','d','v','d'): key = "hd_video";
parse = mov_metadata_int8_no_padding; break;
case MKTAG( 'p','g','a','p'): key = "gapless_playback";
parse = mov_metadata_int8_no_padding; break;
}
if (c->itunes_metadata && atom.size > 8) {
int data_size = avio_rb32(pb);
int tag = avio_rl32(pb);
if (tag == MKTAG('d','a','t','a')) {
data_type = avio_rb32(pb); // type
avio_rb32(pb); // unknown
str_size = data_size - 16;
atom.size -= 16;
} else return 0;
} else if (atom.size > 4 && key && !c->itunes_metadata) {
str_size = avio_rb16(pb); // string length
langcode = avio_rb16(pb);
ff_mov_lang_to_iso639(langcode, language);
atom.size -= 4;
} else
str_size = atom.size;
#ifdef MOV_EXPORT_ALL_METADATA
if (!key) {
snprintf(tmp_key, 5, "%.4s", (char*)&atom.type);
key = tmp_key;
}
#endif
if (!key)
return 0;
if (atom.size < 0)
return -1;
str_size = FFMIN3(sizeof(str)-1, str_size, atom.size);
if (parse)
parse(c, pb, str_size, key);
else {
if (data_type == 3 || (data_type == 0 && langcode < 0x800)) { // MAC Encoded
mov_read_mac_string(c, pb, str_size, str, sizeof(str));
} else {
avio_read(pb, str, str_size);
str[str_size] = 0;
}
av_dict_set(&c->fc->metadata, key, str, 0);
if (*language && strcmp(language, "und")) {
snprintf(key2, sizeof(key2), "%s-%s", key, language);
av_dict_set(&c->fc->metadata, key2, str, 0);
}
}
av_dlog(c->fc, "lang \"%3s\" ", language);
av_dlog(c->fc, "tag \"%s\" value \"%s\" atom \"%.4s\" %d %"PRId64"\n",
key, str, (char*)&atom.type, str_size, atom.size);
return 0;
}
static int mov_read_chpl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int64_t start;
int i, nb_chapters, str_len, version;
char str[256+1];
if ((atom.size -= 5) < 0)
return 0;
version = avio_r8(pb);
avio_rb24(pb);
if (version)
avio_rb32(pb); // ???
nb_chapters = avio_r8(pb);
for (i = 0; i < nb_chapters; i++) {
if (atom.size < 9)
return 0;
start = avio_rb64(pb);
str_len = avio_r8(pb);
if ((atom.size -= 9+str_len) < 0)
return 0;
avio_read(pb, str, str_len);
str[str_len] = 0;
avpriv_new_chapter(c->fc, i, (AVRational){1,10000000}, start, AV_NOPTS_VALUE, str);
}
return 0;
}
static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int64_t total_size = 0;
MOVAtom a;
int i;
if (atom.size < 0)
atom.size = INT64_MAX;
while (total_size + 8 < atom.size && !pb->eof_reached) {
int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
a.size = atom.size;
a.type=0;
if (atom.size >= 8) {
a.size = avio_rb32(pb);
a.type = avio_rl32(pb);
}
av_dlog(c->fc, "type: %08x '%.4s' parent:'%.4s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
a.type, (char*)&a.type, (char*)&atom.type, a.size, total_size, atom.size);
total_size += 8;
if (a.size == 1) { /* 64 bit extended size */
a.size = avio_rb64(pb) - 8;
total_size += 8;
}
if (a.size == 0) {
a.size = atom.size - total_size;
if (a.size <= 8)
break;
}
a.size -= 8;
if (a.size < 0)
break;
a.size = FFMIN(a.size, atom.size - total_size);
for (i = 0; mov_default_parse_table[i].type; i++)
if (mov_default_parse_table[i].type == a.type) {
parse = mov_default_parse_table[i].parse;
break;
}
// container is user data
if (!parse && (atom.type == MKTAG('u','d','t','a') ||
atom.type == MKTAG('i','l','s','t')))
parse = mov_read_udta_string;
if (!parse) { /* skip leaf atoms data */
avio_skip(pb, a.size);
} else {
int64_t start_pos = avio_tell(pb);
int64_t left;
int err = parse(c, pb, a);
if (err < 0)
return err;
if (c->found_moov && c->found_mdat &&
(!pb->seekable || start_pos + a.size == avio_size(pb)))
return 0;
left = a.size - avio_tell(pb) + start_pos;
if (left > 0) /* skip garbage at atom end */
avio_skip(pb, left);
}
total_size += a.size;
}
if (total_size < atom.size && atom.size < 0x7ffff)
avio_skip(pb, atom.size - total_size);
return 0;
}
static int mov_read_dref(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
int entries, i, j;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_rb32(pb); // version + flags
entries = avio_rb32(pb);
if (entries >= UINT_MAX / sizeof(*sc->drefs))
return -1;
sc->drefs = av_mallocz(entries * sizeof(*sc->drefs));
if (!sc->drefs)
return AVERROR(ENOMEM);
sc->drefs_count = entries;
for (i = 0; i < sc->drefs_count; i++) {
MOVDref *dref = &sc->drefs[i];
uint32_t size = avio_rb32(pb);
int64_t next = avio_tell(pb) + size - 4;
if (size < 12)
return -1;
dref->type = avio_rl32(pb);
avio_rb32(pb); // version + flags
av_dlog(c->fc, "type %.4s size %d\n", (char*)&dref->type, size);
if (dref->type == MKTAG('a','l','i','s') && size > 150) {
/* macintosh alias record */
uint16_t volume_len, len;
int16_t type;
avio_skip(pb, 10);
volume_len = avio_r8(pb);
volume_len = FFMIN(volume_len, 27);
avio_read(pb, dref->volume, 27);
dref->volume[volume_len] = 0;
av_log(c->fc, AV_LOG_DEBUG, "volume %s, len %d\n", dref->volume, volume_len);
avio_skip(pb, 12);
len = avio_r8(pb);
len = FFMIN(len, 63);
avio_read(pb, dref->filename, 63);
dref->filename[len] = 0;
av_log(c->fc, AV_LOG_DEBUG, "filename %s, len %d\n", dref->filename, len);
avio_skip(pb, 16);
/* read next level up_from_alias/down_to_target */
dref->nlvl_from = avio_rb16(pb);
dref->nlvl_to = avio_rb16(pb);
av_log(c->fc, AV_LOG_DEBUG, "nlvl from %d, nlvl to %d\n",
dref->nlvl_from, dref->nlvl_to);
avio_skip(pb, 16);
for (type = 0; type != -1 && avio_tell(pb) < next; ) {
type = avio_rb16(pb);
len = avio_rb16(pb);
av_log(c->fc, AV_LOG_DEBUG, "type %d, len %d\n", type, len);
if (len&1)
len += 1;
if (type == 2) { // absolute path
av_free(dref->path);
dref->path = av_mallocz(len+1);
if (!dref->path)
return AVERROR(ENOMEM);
avio_read(pb, dref->path, len);
if (len > volume_len && !strncmp(dref->path, dref->volume, volume_len)) {
len -= volume_len;
memmove(dref->path, dref->path+volume_len, len);
dref->path[len] = 0;
}
for (j = 0; j < len; j++)
if (dref->path[j] == ':')
dref->path[j] = '/';
av_log(c->fc, AV_LOG_DEBUG, "path %s\n", dref->path);
} else if (type == 0) { // directory name
av_free(dref->dir);
dref->dir = av_malloc(len+1);
if (!dref->dir)
return AVERROR(ENOMEM);
avio_read(pb, dref->dir, len);
dref->dir[len] = 0;
for (j = 0; j < len; j++)
if (dref->dir[j] == ':')
dref->dir[j] = '/';
av_log(c->fc, AV_LOG_DEBUG, "dir %s\n", dref->dir);
} else
avio_skip(pb, len);
}
}
avio_seek(pb, next, SEEK_SET);
}
return 0;
}
static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
uint32_t type;
uint32_t av_unused ctype;
if (c->fc->nb_streams < 1) // meta before first trak
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
/* component type */
ctype = avio_rl32(pb);
type = avio_rl32(pb); /* component subtype */
av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
av_dlog(c->fc, "stype= %.4s\n", (char*)&type);
if (type == MKTAG('v','i','d','e'))
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
else if (type == MKTAG('s','o','u','n'))
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
else if (type == MKTAG('m','1','a',' '))
st->codec->codec_id = CODEC_ID_MP2;
else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
avio_rb32(pb); /* component manufacture */
avio_rb32(pb); /* component flags */
avio_rb32(pb); /* component flags mask */
return 0;
}
int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
int tag;
if (fc->nb_streams < 1)
return 0;
st = fc->streams[fc->nb_streams-1];
avio_rb32(pb); /* version + flags */
ff_mp4_read_descr(fc, pb, &tag);
if (tag == MP4ESDescrTag) {
ff_mp4_parse_es_descr(pb, NULL);
} else
avio_rb16(pb); /* ID */
ff_mp4_read_descr(fc, pb, &tag);
if (tag == MP4DecConfigDescrTag)
ff_mp4_read_dec_config_descr(fc, st, pb);
return 0;
}
static int mov_read_esds(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
return ff_mov_read_esds(c->fc, pb, atom);
}
static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
int ac3info, acmod, lfeon, bsmod;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
ac3info = avio_rb24(pb);
bsmod = (ac3info >> 14) & 0x7;
acmod = (ac3info >> 11) & 0x7;
lfeon = (ac3info >> 10) & 0x1;
st->codec->channels = ((int[]){2,1,2,3,3,4,4,5})[acmod] + lfeon;
st->codec->audio_service_type = bsmod;
if (st->codec->channels > 1 && bsmod == 0x7)
st->codec->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
return 0;
}
static int mov_read_chan(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
uint8_t version;
uint32_t flags, layout_tag, bitmap, num_descr;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if (atom.size < 16)
return 0;
version = avio_r8(pb);
flags = avio_rb24(pb);
layout_tag = avio_rb32(pb);
bitmap = avio_rb32(pb);
num_descr = avio_rb32(pb);
if (atom.size < 16ULL + num_descr * 20ULL)
return 0;
av_dlog(c->fc, "chan: size=%ld version=%u flags=%u layout=%u bitmap=%u num_descr=%u\n",
atom.size, version, flags, layout_tag, bitmap, num_descr);
#if 0
/* TODO: use the channel descriptions if the layout tag is 0 */
int i;
for (i = 0; i < num_descr; i++) {
uint32_t label, cflags;
float coords[3];
label = avio_rb32(pb); // mChannelLabel
cflags = avio_rb32(pb); // mChannelFlags
AV_WN32(&coords[0], avio_rl32(pb)); // mCoordinates[0]
AV_WN32(&coords[1], avio_rl32(pb)); // mCoordinates[1]
AV_WN32(&coords[2], avio_rl32(pb)); // mCoordinates[2]
}
#endif
st->codec->channel_layout = ff_mov_get_channel_layout(layout_tag, bitmap);
return 0;
}
static int mov_read_wfex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
ff_get_wav_header(pb, st->codec, atom.size);
return 0;
}
static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
const int num = avio_rb32(pb);
const int den = avio_rb32(pb);
AVStream *st;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((st->sample_aspect_ratio.den != 1 || st->sample_aspect_ratio.num) && // default
(den != st->sample_aspect_ratio.den || num != st->sample_aspect_ratio.num)) {
av_log(c->fc, AV_LOG_WARNING,
"sample aspect ratio already set to %d:%d, ignoring 'pasp' atom (%d:%d)\n",
st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
num, den);
} else if (den != 0) {
st->sample_aspect_ratio.num = num;
st->sample_aspect_ratio.den = den;
}
return 0;
}
/* this atom contains actual media data */
static int mov_read_mdat(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
if (atom.size == 0) /* wrong one (MP4) */
return 0;
c->found_mdat=1;
return 0; /* now go for moov */
}
/* read major brand, minor version and compatible brands and store them as metadata */
static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
uint32_t minor_ver;
int comp_brand_size;
char minor_ver_str[11]; /* 32 bit integer -> 10 digits + null */
char* comp_brands_str;
uint8_t type[5] = {0};
avio_read(pb, type, 4);
if (strcmp(type, "qt "))
c->isom = 1;
av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
av_dict_set(&c->fc->metadata, "major_brand", type, 0);
minor_ver = avio_rb32(pb); /* minor version */
snprintf(minor_ver_str, sizeof(minor_ver_str), "%d", minor_ver);
av_dict_set(&c->fc->metadata, "minor_version", minor_ver_str, 0);
comp_brand_size = atom.size - 8;
if (comp_brand_size < 0)
return -1;
comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
if (!comp_brands_str)
return AVERROR(ENOMEM);
avio_read(pb, comp_brands_str, comp_brand_size);
comp_brands_str[comp_brand_size] = 0;
av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, 0);
av_freep(&comp_brands_str);
return 0;
}
/* this atom should contain all header atoms */
static int mov_read_moov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
if (mov_read_default(c, pb, atom) < 0)
return -1;
/* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
/* so we don't parse the whole file if over a network */
c->found_moov=1;
return 0; /* now go for mdat */
}
static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
c->fragment.moof_offset = avio_tell(pb) - 8;
av_dlog(c->fc, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
return mov_read_default(c, pb, atom);
}
static void mov_metadata_creation_time(AVDictionary **metadata, time_t time)
{
char buffer[32];
if (time) {
struct tm *ptm;
time -= 2082844800; /* seconds between 1904-01-01 and Epoch */
ptm = gmtime(&time);
if (!ptm) return;
strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ptm);
av_dict_set(metadata, "creation_time", buffer, 0);
}
}
static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
int version;
char language[4] = {0};
unsigned lang;
time_t creation_time;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
version = avio_r8(pb);
if (version > 1)
return -1; /* unsupported */
avio_rb24(pb); /* flags */
if (version == 1) {
creation_time = avio_rb64(pb);
avio_rb64(pb);
} else {
creation_time = avio_rb32(pb);
avio_rb32(pb); /* modification time */
}
mov_metadata_creation_time(&st->metadata, creation_time);
sc->time_scale = avio_rb32(pb);
st->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
lang = avio_rb16(pb); /* language */
if (ff_mov_lang_to_iso639(lang, language))
av_dict_set(&st->metadata, "language", language, 0);
avio_rb16(pb); /* quality */
return 0;
}
static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
time_t creation_time;
int version = avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
if (version == 1) {
creation_time = avio_rb64(pb);
avio_rb64(pb);
} else {
creation_time = avio_rb32(pb);
avio_rb32(pb); /* modification time */
}
mov_metadata_creation_time(&c->fc->metadata, creation_time);
c->time_scale = avio_rb32(pb); /* time scale */
av_dlog(c->fc, "time scale = %i\n", c->time_scale);
c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
avio_rb32(pb); /* preferred scale */
avio_rb16(pb); /* preferred volume */
avio_skip(pb, 10); /* reserved */
avio_skip(pb, 36); /* display matrix */
avio_rb32(pb); /* preview time */
avio_rb32(pb); /* preview duration */
avio_rb32(pb); /* poster time */
avio_rb32(pb); /* selection time */
avio_rb32(pb); /* selection duration */
avio_rb32(pb); /* current time */
avio_rb32(pb); /* next track ID */
return 0;
}
static int mov_read_smi(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((uint64_t)atom.size > (1<<30))
return -1;
// currently SVQ3 decoder expect full STSD header - so let's fake it
// this should be fixed and just SMI header should be passed
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(atom.size + 0x5a + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = 0x5a + atom.size;
memcpy(st->codec->extradata, "SVQ3", 4); // fake
avio_read(pb, st->codec->extradata + 0x5a, atom.size);
av_dlog(c->fc, "Reading SMI %"PRId64" %s\n", atom.size, st->codec->extradata + 0x5a);
return 0;
}
static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
int little_endian;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
little_endian = avio_rb16(pb);
av_dlog(c->fc, "enda %d\n", little_endian);
if (little_endian == 1) {
switch (st->codec->codec_id) {
case CODEC_ID_PCM_S24BE:
st->codec->codec_id = CODEC_ID_PCM_S24LE;
break;
case CODEC_ID_PCM_S32BE:
st->codec->codec_id = CODEC_ID_PCM_S32LE;
break;
case CODEC_ID_PCM_F32BE:
st->codec->codec_id = CODEC_ID_PCM_F32LE;
break;
case CODEC_ID_PCM_F64BE:
st->codec->codec_id = CODEC_ID_PCM_F64LE;
break;
default:
break;
}
}
return 0;
}
/* FIXME modify qdm2/svq3/h264 decoders to take full atom as extradata */
static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
uint64_t size;
uint8_t *buf;
if (c->fc->nb_streams < 1) // will happen with jp2 files
return 0;
st= c->fc->streams[c->fc->nb_streams-1];
size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)
return -1;
buf= av_realloc(st->codec->extradata, size);
if (!buf)
return -1;
st->codec->extradata= buf;
buf+= st->codec->extradata_size;
st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
AV_WB32( buf , atom.size + 8);
AV_WL32( buf + 4, atom.type);
avio_read(pb, buf + 8, atom.size);
return 0;
}
static int mov_read_wave(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((uint64_t)atom.size > (1<<30))
return -1;
if (st->codec->codec_id == CODEC_ID_QDM2 || st->codec->codec_id == CODEC_ID_QDMC) {
// pass all frma atom to codec, needed at least for QDMC and QDM2
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = atom.size;
avio_read(pb, st->codec->extradata, atom.size);
} else if (atom.size > 8) { /* to read frma, esds atoms */
if (mov_read_default(c, pb, atom) < 0)
return -1;
} else
avio_skip(pb, atom.size);
return 0;
}
/**
* This function reads atom content and puts data in extradata without tag
* nor size unlike mov_read_extradata.
*/
static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((uint64_t)atom.size > (1<<30))
return -1;
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(atom.size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = atom.size;
avio_read(pb, st->codec->extradata, atom.size);
return 0;
}
/**
* An strf atom is a BITMAPINFOHEADER struct. This struct is 40 bytes itself,
* but can have extradata appended at the end after the 40 bytes belonging
* to the struct.
*/
static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
if (c->fc->nb_streams < 1)
return 0;
if (atom.size <= 40)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((uint64_t)atom.size > (1<<30))
return -1;
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(atom.size - 40 + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = atom.size - 40;
avio_skip(pb, 40);
avio_read(pb, st->codec->extradata, atom.size - 40);
return 0;
}
static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
entries = avio_rb32(pb);
if (!entries)
return 0;
if (entries >= UINT_MAX/sizeof(int64_t))
return -1;
sc->chunk_offsets = av_malloc(entries * sizeof(int64_t));
if (!sc->chunk_offsets)
return AVERROR(ENOMEM);
sc->chunk_count = entries;
if (atom.type == MKTAG('s','t','c','o'))
for (i=0; i<entries; i++)
sc->chunk_offsets[i] = avio_rb32(pb);
else if (atom.type == MKTAG('c','o','6','4'))
for (i=0; i<entries; i++)
sc->chunk_offsets[i] = avio_rb64(pb);
else
return -1;
return 0;
}
/**
* Compute codec id for 'lpcm' tag.
* See CoreAudioTypes and AudioStreamBasicDescription at Apple.
*/
enum CodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
{
if (flags & 1) { // floating point
if (flags & 2) { // big endian
if (bps == 32) return CODEC_ID_PCM_F32BE;
else if (bps == 64) return CODEC_ID_PCM_F64BE;
} else {
if (bps == 32) return CODEC_ID_PCM_F32LE;
else if (bps == 64) return CODEC_ID_PCM_F64LE;
}
} else {
if (flags & 2) {
if (bps == 8)
// signed integer
if (flags & 4) return CODEC_ID_PCM_S8;
else return CODEC_ID_PCM_U8;
else if (bps == 16) return CODEC_ID_PCM_S16BE;
else if (bps == 24) return CODEC_ID_PCM_S24BE;
else if (bps == 32) return CODEC_ID_PCM_S32BE;
} else {
if (bps == 8)
if (flags & 4) return CODEC_ID_PCM_S8;
else return CODEC_ID_PCM_U8;
else if (bps == 16) return CODEC_ID_PCM_S16LE;
else if (bps == 24) return CODEC_ID_PCM_S24LE;
else if (bps == 32) return CODEC_ID_PCM_S32LE;
}
}
return CODEC_ID_NONE;
}
int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
{
AVStream *st;
MOVStreamContext *sc;
int j, pseudo_stream_id;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
for (pseudo_stream_id=0; pseudo_stream_id<entries; pseudo_stream_id++) {
//Parsing Sample description table
enum CodecID id;
int dref_id = 1;
MOVAtom a = { AV_RL32("stsd") };
int64_t start_pos = avio_tell(pb);
int size = avio_rb32(pb); /* size */
uint32_t format = avio_rl32(pb); /* data format */
if (size >= 16) {
avio_rb32(pb); /* reserved */
avio_rb16(pb); /* reserved */
dref_id = avio_rb16(pb);
}
if (st->codec->codec_tag &&
st->codec->codec_tag != format &&
(c->fc->video_codec_id ? ff_codec_get_id(codec_movvideo_tags, format) != c->fc->video_codec_id
: st->codec->codec_tag != MKTAG('j','p','e','g'))
){
/* Multiple fourcc, we skip JPEG. This is not correct, we should
* export it as a separate AVStream but this needs a few changes
* in the MOV demuxer, patch welcome. */
multiple_stsd:
av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
avio_skip(pb, size - (avio_tell(pb) - start_pos));
continue;
}
/* we cannot demux concatenated h264 streams because of different extradata */
if (st->codec->codec_tag && st->codec->codec_tag == AV_RL32("avc1"))
goto multiple_stsd;
sc->pseudo_stream_id = st->codec->codec_tag ? -1 : pseudo_stream_id;
sc->dref_id= dref_id;
st->codec->codec_tag = format;
id = ff_codec_get_id(codec_movaudio_tags, format);
if (id<=0 && ((format&0xFFFF) == 'm'+('s'<<8) || (format&0xFFFF) == 'T'+('S'<<8)))
id = ff_codec_get_id(ff_codec_wav_tags, av_bswap32(format)&0xFFFF);
if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO && id > 0) {
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
} else if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO && /* do not overwrite codec type */
format && format != MKTAG('m','p','4','s')) { /* skip old asf mpeg4 tag */
id = ff_codec_get_id(codec_movvideo_tags, format);
if (id <= 0)
id = ff_codec_get_id(ff_codec_bmp_tags, format);
if (id > 0)
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
else if (st->codec->codec_type == AVMEDIA_TYPE_DATA){
id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
if (id > 0)
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
}
}
av_dlog(c->fc, "size=%d 4CC= %c%c%c%c codec_type=%d\n", size,
(format >> 0) & 0xff, (format >> 8) & 0xff, (format >> 16) & 0xff,
(format >> 24) & 0xff, st->codec->codec_type);
if (st->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
unsigned int color_depth, len;
int color_greyscale;
st->codec->codec_id = id;
avio_rb16(pb); /* version */
avio_rb16(pb); /* revision level */
avio_rb32(pb); /* vendor */
avio_rb32(pb); /* temporal quality */
avio_rb32(pb); /* spatial quality */
st->codec->width = avio_rb16(pb); /* width */
st->codec->height = avio_rb16(pb); /* height */
avio_rb32(pb); /* horiz resolution */
avio_rb32(pb); /* vert resolution */
avio_rb32(pb); /* data size, always 0 */
avio_rb16(pb); /* frames per samples */
len = avio_r8(pb); /* codec name, pascal string */
if (len > 31)
len = 31;
mov_read_mac_string(c, pb, len, st->codec->codec_name, 32);
if (len < 31)
avio_skip(pb, 31 - len);
/* codec_tag YV12 triggers an UV swap in rawdec.c */
if (!memcmp(st->codec->codec_name, "Planar Y'CbCr 8-bit 4:2:0", 25))
st->codec->codec_tag=MKTAG('I', '4', '2', '0');
st->codec->bits_per_coded_sample = avio_rb16(pb); /* depth */
st->codec->color_table_id = avio_rb16(pb); /* colortable id */
av_dlog(c->fc, "depth %d, ctab id %d\n",
st->codec->bits_per_coded_sample, st->codec->color_table_id);
/* figure out the palette situation */
color_depth = st->codec->bits_per_coded_sample & 0x1F;
color_greyscale = st->codec->bits_per_coded_sample & 0x20;
/* if the depth is 2, 4, or 8 bpp, file is palettized */
if ((color_depth == 2) || (color_depth == 4) ||
(color_depth == 8)) {
/* for palette traversal */
unsigned int color_start, color_count, color_end;
unsigned char r, g, b;
if (color_greyscale) {
int color_index, color_dec;
/* compute the greyscale palette */
st->codec->bits_per_coded_sample = color_depth;
color_count = 1 << color_depth;
color_index = 255;
color_dec = 256 / (color_count - 1);
for (j = 0; j < color_count; j++) {
r = g = b = color_index;
sc->palette[j] =
(r << 16) | (g << 8) | (b);
color_index -= color_dec;
if (color_index < 0)
color_index = 0;
}
} else if (st->codec->color_table_id) {
const uint8_t *color_table;
/* if flag bit 3 is set, use the default palette */
color_count = 1 << color_depth;
if (color_depth == 2)
color_table = ff_qt_default_palette_4;
else if (color_depth == 4)
color_table = ff_qt_default_palette_16;
else
color_table = ff_qt_default_palette_256;
for (j = 0; j < color_count; j++) {
r = color_table[j * 3 + 0];
g = color_table[j * 3 + 1];
b = color_table[j * 3 + 2];
sc->palette[j] =
(r << 16) | (g << 8) | (b);
}
} else {
/* load the palette from the file */
color_start = avio_rb32(pb);
color_count = avio_rb16(pb);
color_end = avio_rb16(pb);
if ((color_start <= 255) &&
(color_end <= 255)) {
for (j = color_start; j <= color_end; j++) {
/* each R, G, or B component is 16 bits;
* only use the top 8 bits; skip alpha bytes
* up front */
avio_r8(pb);
avio_r8(pb);
r = avio_r8(pb);
avio_r8(pb);
g = avio_r8(pb);
avio_r8(pb);
b = avio_r8(pb);
avio_r8(pb);
sc->palette[j] =
(r << 16) | (g << 8) | (b);
}
}
}
sc->has_palette = 1;
}
} else if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
int bits_per_sample, flags;
uint16_t version = avio_rb16(pb);
st->codec->codec_id = id;
avio_rb16(pb); /* revision level */
avio_rb32(pb); /* vendor */
st->codec->channels = avio_rb16(pb); /* channel count */
av_dlog(c->fc, "audio channels %d\n", st->codec->channels);
st->codec->bits_per_coded_sample = avio_rb16(pb); /* sample size */
sc->audio_cid = avio_rb16(pb);
avio_rb16(pb); /* packet size = 0 */
st->codec->sample_rate = ((avio_rb32(pb) >> 16));
//Read QT version 1 fields. In version 0 these do not exist.
av_dlog(c->fc, "version =%d, isom =%d\n",version,c->isom);
if (!c->isom) {
if (version==1) {
sc->samples_per_frame = avio_rb32(pb);
avio_rb32(pb); /* bytes per packet */
sc->bytes_per_frame = avio_rb32(pb);
avio_rb32(pb); /* bytes per sample */
} else if (version==2) {
avio_rb32(pb); /* sizeof struct only */
st->codec->sample_rate = av_int2dbl(avio_rb64(pb)); /* float 64 */
st->codec->channels = avio_rb32(pb);
avio_rb32(pb); /* always 0x7F000000 */
st->codec->bits_per_coded_sample = avio_rb32(pb); /* bits per channel if sound is uncompressed */
flags = avio_rb32(pb); /* lpcm format specific flag */
sc->bytes_per_frame = avio_rb32(pb); /* bytes per audio packet if constant */
sc->samples_per_frame = avio_rb32(pb); /* lpcm frames per audio packet if constant */
if (format == MKTAG('l','p','c','m'))
st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, flags);
}
}
switch (st->codec->codec_id) {
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
if (st->codec->bits_per_coded_sample == 16)
st->codec->codec_id = CODEC_ID_PCM_S16BE;
break;
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
if (st->codec->bits_per_coded_sample == 8)
st->codec->codec_id = CODEC_ID_PCM_S8;
else if (st->codec->bits_per_coded_sample == 24)
st->codec->codec_id =
st->codec->codec_id == CODEC_ID_PCM_S16BE ?
CODEC_ID_PCM_S24BE : CODEC_ID_PCM_S24LE;
break;
/* set values for old format before stsd version 1 appeared */
case CODEC_ID_MACE3:
sc->samples_per_frame = 6;
sc->bytes_per_frame = 2*st->codec->channels;
break;
case CODEC_ID_MACE6:
sc->samples_per_frame = 6;
sc->bytes_per_frame = 1*st->codec->channels;
break;
case CODEC_ID_ADPCM_IMA_QT:
sc->samples_per_frame = 64;
sc->bytes_per_frame = 34*st->codec->channels;
break;
case CODEC_ID_GSM:
sc->samples_per_frame = 160;
sc->bytes_per_frame = 33;
break;
default:
break;
}
bits_per_sample = av_get_bits_per_sample(st->codec->codec_id);
if (bits_per_sample) {
st->codec->bits_per_coded_sample = bits_per_sample;
sc->sample_size = (bits_per_sample >> 3) * st->codec->channels;
}
} else if (st->codec->codec_type==AVMEDIA_TYPE_SUBTITLE){
// ttxt stsd contains display flags, justification, background
// color, fonts, and default styles, so fake an atom to read it
MOVAtom fake_atom = { .size = size - (avio_tell(pb) - start_pos) };
if (format != AV_RL32("mp4s")) // mp4s contains a regular esds atom
mov_read_glbl(c, pb, fake_atom);
st->codec->codec_id= id;
st->codec->width = sc->width;
st->codec->height = sc->height;
} else {
/* other codec type, just skip (rtp, mp4s, tmcd ...) */
avio_skip(pb, size - (avio_tell(pb) - start_pos));
}
/* this will read extra atoms at the end (wave, alac, damr, avcC, SMI ...) */
a.size = size - (avio_tell(pb) - start_pos);
if (a.size > 8) {
if (mov_read_default(c, pb, a) < 0)
return -1;
} else if (a.size > 0)
avio_skip(pb, a.size);
}
if (st->codec->codec_type==AVMEDIA_TYPE_AUDIO && st->codec->sample_rate==0 && sc->time_scale>1)
st->codec->sample_rate= sc->time_scale;
/* special codec parameters handling */
switch (st->codec->codec_id) {
#if CONFIG_DV_DEMUXER
case CODEC_ID_DVAUDIO:
c->dv_fctx = avformat_alloc_context();
c->dv_demux = avpriv_dv_init_demux(c->dv_fctx);
if (!c->dv_demux) {
av_log(c->fc, AV_LOG_ERROR, "dv demux context init error\n");
return -1;
}
sc->dv_audio_container = 1;
st->codec->codec_id = CODEC_ID_PCM_S16LE;
break;
#endif
/* no ifdef since parameters are always those */
case CODEC_ID_QCELP:
// force sample rate for qcelp when not stored in mov
if (st->codec->codec_tag != MKTAG('Q','c','l','p'))
st->codec->sample_rate = 8000;
st->codec->frame_size= 160;
st->codec->channels= 1; /* really needed */
break;
case CODEC_ID_AMR_NB:
st->codec->channels= 1; /* really needed */
/* force sample rate for amr, stsd in 3gp does not store sample rate */
st->codec->sample_rate = 8000;
/* force frame_size, too, samples_per_frame isn't always set properly */
st->codec->frame_size = 160;
break;
case CODEC_ID_AMR_WB:
st->codec->channels = 1;
st->codec->sample_rate = 16000;
st->codec->frame_size = 320;
break;
case CODEC_ID_MP2:
case CODEC_ID_MP3:
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; /* force type after stsd for m1a hdlr */
st->need_parsing = AVSTREAM_PARSE_FULL;
break;
case CODEC_ID_GSM:
case CODEC_ID_ADPCM_MS:
case CODEC_ID_ADPCM_IMA_WAV:
st->codec->frame_size = sc->samples_per_frame;
st->codec->block_align = sc->bytes_per_frame;
break;
case CODEC_ID_ALAC:
if (st->codec->extradata_size == 36) {
st->codec->frame_size = AV_RB32(st->codec->extradata+12);
st->codec->channels = AV_RB8 (st->codec->extradata+21);
st->codec->sample_rate = AV_RB32(st->codec->extradata+32);
}
break;
default:
break;
}
return 0;
}
static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int entries;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
entries = avio_rb32(pb);
return ff_mov_read_stsd_entries(c, pb, entries);
}
static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
entries = avio_rb32(pb);
av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(*sc->stsc_data))
return -1;
sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
if (!sc->stsc_data)
return AVERROR(ENOMEM);
sc->stsc_count = entries;
for (i=0; i<entries; i++) {
sc->stsc_data[i].first = avio_rb32(pb);
sc->stsc_data[i].count = avio_rb32(pb);
sc->stsc_data[i].id = avio_rb32(pb);
}
return 0;
}
static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned i, entries;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_rb32(pb); // version + flags
entries = avio_rb32(pb);
if (entries >= UINT_MAX / sizeof(*sc->stps_data))
return -1;
sc->stps_data = av_malloc(entries * sizeof(*sc->stps_data));
if (!sc->stps_data)
return AVERROR(ENOMEM);
sc->stps_count = entries;
for (i = 0; i < entries; i++) {
sc->stps_data[i] = avio_rb32(pb);
//av_dlog(c->fc, "stps %d\n", sc->stps_data[i]);
}
return 0;
}
static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
entries = avio_rb32(pb);
av_dlog(c->fc, "keyframe_count = %d\n", entries);
if (entries >= UINT_MAX / sizeof(int))
return -1;
sc->keyframes = av_malloc(entries * sizeof(int));
if (!sc->keyframes)
return AVERROR(ENOMEM);
sc->keyframe_count = entries;
for (i=0; i<entries; i++) {
sc->keyframes[i] = avio_rb32(pb);
//av_dlog(c->fc, "keyframes[]=%d\n", sc->keyframes[i]);
}
return 0;
}
static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries, sample_size, field_size, num_bytes;
GetBitContext gb;
unsigned char* buf;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
if (atom.type == MKTAG('s','t','s','z')) {
sample_size = avio_rb32(pb);
if (!sc->sample_size) /* do not overwrite value computed in stsd */
sc->sample_size = sample_size;
field_size = 32;
} else {
sample_size = 0;
avio_rb24(pb); /* reserved */
field_size = avio_r8(pb);
}
entries = avio_rb32(pb);
av_dlog(c->fc, "sample_size = %d sample_count = %d\n", sc->sample_size, entries);
sc->sample_count = entries;
if (sample_size)
return 0;
if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %d\n", field_size);
return -1;
}
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
return -1;
sc->sample_sizes = av_malloc(entries * sizeof(int));
if (!sc->sample_sizes)
return AVERROR(ENOMEM);
num_bytes = (entries*field_size+4)>>3;
buf = av_malloc(num_bytes+FF_INPUT_BUFFER_PADDING_SIZE);
if (!buf) {
av_freep(&sc->sample_sizes);
return AVERROR(ENOMEM);
}
if (avio_read(pb, buf, num_bytes) < num_bytes) {
av_freep(&sc->sample_sizes);
av_free(buf);
return -1;
}
init_get_bits(&gb, buf, 8*num_bytes);
for (i=0; i<entries; i++)
sc->sample_sizes[i] = get_bits_long(&gb, field_size);
av_free(buf);
return 0;
}
static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries;
int64_t duration=0;
int64_t total_sample_count=0;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
entries = avio_rb32(pb);
av_dlog(c->fc, "track[%i].stts.entries = %i\n",
c->fc->nb_streams-1, entries);
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(*sc->stts_data))
return AVERROR(EINVAL);
sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
if (!sc->stts_data)
return AVERROR(ENOMEM);
sc->stts_count = entries;
for (i=0; i<entries; i++) {
int sample_duration;
int sample_count;
sample_count=avio_rb32(pb);
sample_duration = avio_rb32(pb);
sc->stts_data[i].count= sample_count;
sc->stts_data[i].duration= sample_duration;
av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",
sample_count, sample_duration);
duration+=(int64_t)sample_duration*sample_count;
total_sample_count+=sample_count;
}
st->nb_frames= total_sample_count;
if (duration)
st->duration= duration;
return 0;
}
static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
unsigned int i, entries;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
entries = avio_rb32(pb);
av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
return -1;
sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
if (!sc->ctts_data)
return AVERROR(ENOMEM);
sc->ctts_count = entries;
for (i=0; i<entries; i++) {
int count =avio_rb32(pb);
int duration =avio_rb32(pb);
sc->ctts_data[i].count = count;
sc->ctts_data[i].duration= duration;
if (duration < 0)
sc->dts_shift = FFMAX(sc->dts_shift, -duration);
}
av_dlog(c->fc, "dts shift %d\n", sc->dts_shift);
return 0;
}
static void mov_build_index(MOVContext *mov, AVStream *st)
{
MOVStreamContext *sc = st->priv_data;
int64_t current_offset;
int64_t current_dts = 0;
unsigned int stts_index = 0;
unsigned int stsc_index = 0;
unsigned int stss_index = 0;
unsigned int stps_index = 0;
unsigned int i, j;
uint64_t stream_size = 0;
/* adjust first dts according to edit list */
if (sc->time_offset && mov->time_scale > 0) {
if (sc->time_offset < 0)
sc->time_offset = av_rescale(sc->time_offset, sc->time_scale, mov->time_scale);
current_dts = -sc->time_offset;
if (sc->ctts_data && sc->stts_data && sc->stts_data[0].duration &&
sc->ctts_data[0].duration / sc->stts_data[0].duration > 16) {
/* more than 16 frames delay, dts are likely wrong
this happens with files created by iMovie */
sc->wrong_dts = 1;
st->codec->has_b_frames = 1;
}
}
/* only use old uncompressed audio chunk demuxing when stts specifies it */
if (!(st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
unsigned int current_sample = 0;
unsigned int stts_sample = 0;
unsigned int sample_size;
unsigned int distance = 0;
int key_off = sc->keyframes && sc->keyframes[0] == 1;
current_dts -= sc->dts_shift;
if (!sc->sample_count)
return;
if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries))
return;
st->index_entries = av_malloc(sc->sample_count*sizeof(*st->index_entries));
if (!st->index_entries)
return;
st->index_entries_allocated_size = sc->sample_count*sizeof(*st->index_entries);
for (i = 0; i < sc->chunk_count; i++) {
current_offset = sc->chunk_offsets[i];
while (stsc_index + 1 < sc->stsc_count &&
i + 1 == sc->stsc_data[stsc_index + 1].first)
stsc_index++;
for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
int keyframe = 0;
if (current_sample >= sc->sample_count) {
av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
return;
}
if (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index]) {
keyframe = 1;
if (stss_index + 1 < sc->keyframe_count)
stss_index++;
} else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
keyframe = 1;
if (stps_index + 1 < sc->stps_count)
stps_index++;
}
if (keyframe)
distance = 0;
sample_size = sc->sample_size > 0 ? sc->sample_size : sc->sample_sizes[current_sample];
if (sc->pseudo_stream_id == -1 ||
sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
AVIndexEntry *e = &st->index_entries[st->nb_index_entries++];
e->pos = current_offset;
e->timestamp = current_dts;
e->size = sample_size;
e->min_distance = distance;
e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
av_dlog(mov->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
"size %d, distance %d, keyframe %d\n", st->index, current_sample,
current_offset, current_dts, sample_size, distance, keyframe);
}
current_offset += sample_size;
stream_size += sample_size;
current_dts += sc->stts_data[stts_index].duration;
distance++;
stts_sample++;
current_sample++;
if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
stts_sample = 0;
stts_index++;
}
}
}
if (st->duration > 0)
st->codec->bit_rate = stream_size*8*sc->time_scale/st->duration;
} else {
unsigned chunk_samples, total = 0;
// compute total chunk count
for (i = 0; i < sc->stsc_count; i++) {
unsigned count, chunk_count;
chunk_samples = sc->stsc_data[i].count;
if (sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
return;
}
if (sc->samples_per_frame >= 160) { // gsm
count = chunk_samples / sc->samples_per_frame;
} else if (sc->samples_per_frame > 1) {
unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
count = (chunk_samples+samples-1) / samples;
} else {
count = (chunk_samples+1023) / 1024;
}
if (i < sc->stsc_count - 1)
chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
else
chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
total += chunk_count * count;
}
av_dlog(mov->fc, "chunk count %d\n", total);
if (total >= UINT_MAX / sizeof(*st->index_entries))
return;
st->index_entries = av_malloc(total*sizeof(*st->index_entries));
if (!st->index_entries)
return;
st->index_entries_allocated_size = total*sizeof(*st->index_entries);
// populate index
for (i = 0; i < sc->chunk_count; i++) {
current_offset = sc->chunk_offsets[i];
if (stsc_index + 1 < sc->stsc_count &&
i + 1 == sc->stsc_data[stsc_index + 1].first)
stsc_index++;
chunk_samples = sc->stsc_data[stsc_index].count;
while (chunk_samples > 0) {
AVIndexEntry *e;
unsigned size, samples;
if (sc->samples_per_frame >= 160) { // gsm
samples = sc->samples_per_frame;
size = sc->bytes_per_frame;
} else {
if (sc->samples_per_frame > 1) {
samples = FFMIN((1024 / sc->samples_per_frame)*
sc->samples_per_frame, chunk_samples);
size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
} else {
samples = FFMIN(1024, chunk_samples);
size = samples * sc->sample_size;
}
}
if (st->nb_index_entries >= total) {
av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %d\n", total);
return;
}
e = &st->index_entries[st->nb_index_entries++];
e->pos = current_offset;
e->timestamp = current_dts;
e->size = size;
e->min_distance = 0;
e->flags = AVINDEX_KEYFRAME;
av_dlog(mov->fc, "AVIndex stream %d, chunk %d, offset %"PRIx64", dts %"PRId64", "
"size %d, duration %d\n", st->index, i, current_offset, current_dts,
size, samples);
current_offset += size;
current_dts += samples;
chunk_samples -= samples;
}
}
}
}
static int mov_open_dref(AVIOContext **pb, char *src, MOVDref *ref,
AVIOInterruptCB *int_cb)
{
/* try relative path, we do not try the absolute because it can leak information about our
system to an attacker */
if (ref->nlvl_to > 0 && ref->nlvl_from > 0) {
char filename[1024];
char *src_path;
int i, l;
/* find a source dir */
src_path = strrchr(src, '/');
if (src_path)
src_path++;
else
src_path = src;
/* find a next level down to target */
for (i = 0, l = strlen(ref->path) - 1; l >= 0; l--)
if (ref->path[l] == '/') {
if (i == ref->nlvl_to - 1)
break;
else
i++;
}
/* compose filename if next level down to target was found */
if (i == ref->nlvl_to - 1 && src_path - src < sizeof(filename)) {
memcpy(filename, src, src_path - src);
filename[src_path - src] = 0;
for (i = 1; i < ref->nlvl_from; i++)
av_strlcat(filename, "../", 1024);
av_strlcat(filename, ref->path + l + 1, 1024);
if (!avio_open2(pb, filename, AVIO_FLAG_READ, int_cb, NULL))
return 0;
}
}
return AVERROR(ENOENT);
}
static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
MOVStreamContext *sc;
int ret;
st = avformat_new_stream(c->fc, NULL);
if (!st) return AVERROR(ENOMEM);
st->id = c->fc->nb_streams;
sc = av_mallocz(sizeof(MOVStreamContext));
if (!sc) return AVERROR(ENOMEM);
st->priv_data = sc;
st->codec->codec_type = AVMEDIA_TYPE_DATA;
sc->ffindex = st->index;
if ((ret = mov_read_default(c, pb, atom)) < 0)
return ret;
/* sanity checks */
if (sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
(!sc->sample_size && !sc->sample_count))) {
av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
st->index);
return 0;
}
if (sc->time_scale <= 0) {
av_log(c->fc, AV_LOG_WARNING, "stream %d, timescale not set\n", st->index);
sc->time_scale = c->time_scale;
if (sc->time_scale <= 0)
sc->time_scale = 1;
}
avpriv_set_pts_info(st, 64, 1, sc->time_scale);
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
!st->codec->frame_size && sc->stts_count == 1) {
st->codec->frame_size = av_rescale(sc->stts_data[0].duration,
st->codec->sample_rate, sc->time_scale);
av_dlog(c->fc, "frame size %d\n", st->codec->frame_size);
}
mov_build_index(c, st);
if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
MOVDref *dref = &sc->drefs[sc->dref_id - 1];
if (mov_open_dref(&sc->pb, c->fc->filename, dref, &c->fc->interrupt_callback) < 0)
av_log(c->fc, AV_LOG_ERROR,
"stream %d, error opening alias: path='%s', dir='%s', "
"filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
st->index, dref->path, dref->dir, dref->filename,
dref->volume, dref->nlvl_from, dref->nlvl_to);
} else
sc->pb = c->fc->pb;
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if (!st->sample_aspect_ratio.num &&
(st->codec->width != sc->width || st->codec->height != sc->height)) {
st->sample_aspect_ratio = av_d2q(((double)st->codec->height * sc->width) /
((double)st->codec->width * sc->height), INT_MAX);
}
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
sc->time_scale*st->nb_frames, st->duration, INT_MAX);
if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
sc->time_scale, sc->stts_data[0].duration, INT_MAX);
}
switch (st->codec->codec_id) {
#if CONFIG_H261_DECODER
case CODEC_ID_H261:
#endif
#if CONFIG_H263_DECODER
case CODEC_ID_H263:
#endif
#if CONFIG_H264_DECODER
case CODEC_ID_H264:
#endif
#if CONFIG_MPEG4_DECODER
case CODEC_ID_MPEG4:
#endif
st->codec->width = 0; /* let decoder init width/height */
st->codec->height= 0;
break;
}
/* Do not need those anymore. */
av_freep(&sc->chunk_offsets);
av_freep(&sc->stsc_data);
av_freep(&sc->sample_sizes);
av_freep(&sc->keyframes);
av_freep(&sc->stts_data);
av_freep(&sc->stps_data);
return 0;
}
static int mov_read_ilst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int ret;
c->itunes_metadata = 1;
ret = mov_read_default(c, pb, atom);
c->itunes_metadata = 0;
return ret;
}
static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
while (atom.size > 8) {
uint32_t tag = avio_rl32(pb);
atom.size -= 4;
if (tag == MKTAG('h','d','l','r')) {
avio_seek(pb, -8, SEEK_CUR);
atom.size += 8;
return mov_read_default(c, pb, atom);
}
}
return 0;
}
static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int i;
int width;
int height;
int64_t disp_transform[2];
int display_matrix[3][2];
AVStream *st;
MOVStreamContext *sc;
int version;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
sc = st->priv_data;
version = avio_r8(pb);
avio_rb24(pb); /* flags */
/*
MOV_TRACK_ENABLED 0x0001
MOV_TRACK_IN_MOVIE 0x0002
MOV_TRACK_IN_PREVIEW 0x0004
MOV_TRACK_IN_POSTER 0x0008
*/
if (version == 1) {
avio_rb64(pb);
avio_rb64(pb);
} else {
avio_rb32(pb); /* creation time */
avio_rb32(pb); /* modification time */
}
st->id = (int)avio_rb32(pb); /* track id (NOT 0 !)*/
avio_rb32(pb); /* reserved */
/* highlevel (considering edits) duration in movie timebase */
(version == 1) ? avio_rb64(pb) : avio_rb32(pb);
avio_rb32(pb); /* reserved */
avio_rb32(pb); /* reserved */
avio_rb16(pb); /* layer */
avio_rb16(pb); /* alternate group */
avio_rb16(pb); /* volume */
avio_rb16(pb); /* reserved */
//read in the display matrix (outlined in ISO 14496-12, Section 6.2.2)
// they're kept in fixed point format through all calculations
// ignore u,v,z b/c we don't need the scale factor to calc aspect ratio
for (i = 0; i < 3; i++) {
display_matrix[i][0] = avio_rb32(pb); // 16.16 fixed point
display_matrix[i][1] = avio_rb32(pb); // 16.16 fixed point
avio_rb32(pb); // 2.30 fixed point (not used)
}
width = avio_rb32(pb); // 16.16 fixed point track width
height = avio_rb32(pb); // 16.16 fixed point track height
sc->width = width >> 16;
sc->height = height >> 16;
// transform the display width/height according to the matrix
// skip this if the display matrix is the default identity matrix
// or if it is rotating the picture, ex iPhone 3GS
// to keep the same scale, use [width height 1<<16]
if (width && height &&
((display_matrix[0][0] != 65536 ||
display_matrix[1][1] != 65536) &&
!display_matrix[0][1] &&
!display_matrix[1][0] &&
!display_matrix[2][0] && !display_matrix[2][1])) {
for (i = 0; i < 2; i++)
disp_transform[i] =
(int64_t) width * display_matrix[0][i] +
(int64_t) height * display_matrix[1][i] +
((int64_t) display_matrix[2][i] << 16);
//sample aspect ratio is new width/height divided by old width/height
st->sample_aspect_ratio = av_d2q(
((double) disp_transform[0] * height) /
((double) disp_transform[1] * width), INT_MAX);
}
return 0;
}
static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
MOVFragment *frag = &c->fragment;
MOVTrackExt *trex = NULL;
int flags, track_id, i;
avio_r8(pb); /* version */
flags = avio_rb24(pb);
track_id = avio_rb32(pb);
if (!track_id)
return -1;
frag->track_id = track_id;
for (i = 0; i < c->trex_count; i++)
if (c->trex_data[i].track_id == frag->track_id) {
trex = &c->trex_data[i];
break;
}
if (!trex) {
av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
return -1;
}
if (flags & 0x01) frag->base_data_offset = avio_rb64(pb);
else frag->base_data_offset = frag->moof_offset;
if (flags & 0x02) frag->stsd_id = avio_rb32(pb);
else frag->stsd_id = trex->stsd_id;
frag->duration = flags & 0x08 ? avio_rb32(pb) : trex->duration;
frag->size = flags & 0x10 ? avio_rb32(pb) : trex->size;
frag->flags = flags & 0x20 ? avio_rb32(pb) : trex->flags;
av_dlog(c->fc, "frag flags 0x%x\n", frag->flags);
return 0;
}
static int mov_read_chap(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
c->chapter_track = avio_rb32(pb);
return 0;
}
static int mov_read_trex(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
MOVTrackExt *trex;
if ((uint64_t)c->trex_count+1 >= UINT_MAX / sizeof(*c->trex_data))
return -1;
trex = av_realloc(c->trex_data, (c->trex_count+1)*sizeof(*c->trex_data));
if (!trex)
return AVERROR(ENOMEM);
c->trex_data = trex;
trex = &c->trex_data[c->trex_count++];
avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
trex->track_id = avio_rb32(pb);
trex->stsd_id = avio_rb32(pb);
trex->duration = avio_rb32(pb);
trex->size = avio_rb32(pb);
trex->flags = avio_rb32(pb);
return 0;
}
static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
MOVFragment *frag = &c->fragment;
AVStream *st = NULL;
MOVStreamContext *sc;
MOVStts *ctts_data;
uint64_t offset;
int64_t dts;
int data_offset = 0;
unsigned entries, first_sample_flags = frag->flags;
int flags, distance, i;
for (i = 0; i < c->fc->nb_streams; i++) {
if (c->fc->streams[i]->id == frag->track_id) {
st = c->fc->streams[i];
break;
}
}
if (!st) {
av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", frag->track_id);
return -1;
}
sc = st->priv_data;
if (sc->pseudo_stream_id+1 != frag->stsd_id)
return 0;
avio_r8(pb); /* version */
flags = avio_rb24(pb);
entries = avio_rb32(pb);
av_dlog(c->fc, "flags 0x%x entries %d\n", flags, entries);
/* Always assume the presence of composition time offsets.
* Without this assumption, for instance, we cannot deal with a track in fragmented movies that meet the following.
* 1) in the initial movie, there are no samples.
* 2) in the first movie fragment, there is only one sample without composition time offset.
* 3) in the subsequent movie fragments, there are samples with composition time offset. */
if (!sc->ctts_count && sc->sample_count)
{
/* Complement ctts table if moov atom doesn't have ctts atom. */
ctts_data = av_malloc(sizeof(*sc->ctts_data));
if (!ctts_data)
return AVERROR(ENOMEM);
sc->ctts_data = ctts_data;
sc->ctts_data[sc->ctts_count].count = sc->sample_count;
sc->ctts_data[sc->ctts_count].duration = 0;
sc->ctts_count++;
}
if ((uint64_t)entries+sc->ctts_count >= UINT_MAX/sizeof(*sc->ctts_data))
return -1;
ctts_data = av_realloc(sc->ctts_data,
(entries+sc->ctts_count)*sizeof(*sc->ctts_data));
if (!ctts_data)
return AVERROR(ENOMEM);
sc->ctts_data = ctts_data;
if (flags & 0x001) data_offset = avio_rb32(pb);
if (flags & 0x004) first_sample_flags = avio_rb32(pb);
dts = st->duration - sc->time_offset;
offset = frag->base_data_offset + data_offset;
distance = 0;
av_dlog(c->fc, "first sample flags 0x%x\n", first_sample_flags);
for (i = 0; i < entries; i++) {
unsigned sample_size = frag->size;
int sample_flags = i ? frag->flags : first_sample_flags;
unsigned sample_duration = frag->duration;
int keyframe;
if (flags & 0x100) sample_duration = avio_rb32(pb);
if (flags & 0x200) sample_size = avio_rb32(pb);
if (flags & 0x400) sample_flags = avio_rb32(pb);
sc->ctts_data[sc->ctts_count].count = 1;
sc->ctts_data[sc->ctts_count].duration = (flags & 0x800) ? avio_rb32(pb) : 0;
sc->ctts_count++;
if ((keyframe = st->codec->codec_type == AVMEDIA_TYPE_AUDIO ||
(flags & 0x004 && !i && !sample_flags) || sample_flags & 0x2000000))
distance = 0;
av_add_index_entry(st, offset, dts, sample_size, distance,
keyframe ? AVINDEX_KEYFRAME : 0);
av_dlog(c->fc, "AVIndex stream %d, sample %d, offset %"PRIx64", dts %"PRId64", "
"size %d, distance %d, keyframe %d\n", st->index, sc->sample_count+i,
offset, dts, sample_size, distance, keyframe);
distance++;
dts += sample_duration;
offset += sample_size;
}
frag->moof_offset = offset;
st->duration = dts + sc->time_offset;
return 0;
}
/* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
/* like the files created with Adobe Premiere 5.0, for samples see */
/* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
static int mov_read_wide(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int err;
if (atom.size < 8)
return 0; /* continue */
if (avio_rb32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
avio_skip(pb, atom.size - 4);
return 0;
}
atom.type = avio_rl32(pb);
atom.size -= 8;
if (atom.type != MKTAG('m','d','a','t')) {
avio_skip(pb, atom.size);
return 0;
}
err = mov_read_mdat(c, pb, atom);
return err;
}
static int mov_read_cmov(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
#if CONFIG_ZLIB
AVIOContext ctx;
uint8_t *cmov_data;
uint8_t *moov_data; /* uncompressed data */
long cmov_len, moov_len;
int ret = -1;
avio_rb32(pb); /* dcom atom */
if (avio_rl32(pb) != MKTAG('d','c','o','m'))
return -1;
if (avio_rl32(pb) != MKTAG('z','l','i','b')) {
av_log(c->fc, AV_LOG_ERROR, "unknown compression for cmov atom !");
return -1;
}
avio_rb32(pb); /* cmvd atom */
if (avio_rl32(pb) != MKTAG('c','m','v','d'))
return -1;
moov_len = avio_rb32(pb); /* uncompressed size */
cmov_len = atom.size - 6 * 4;
cmov_data = av_malloc(cmov_len);
if (!cmov_data)
return AVERROR(ENOMEM);
moov_data = av_malloc(moov_len);
if (!moov_data) {
av_free(cmov_data);
return AVERROR(ENOMEM);
}
avio_read(pb, cmov_data, cmov_len);
if (uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
goto free_and_return;
if (ffio_init_context(&ctx, moov_data, moov_len, 0, NULL, NULL, NULL, NULL) != 0)
goto free_and_return;
atom.type = MKTAG('m','o','o','v');
atom.size = moov_len;
ret = mov_read_default(c, &ctx, atom);
free_and_return:
av_free(moov_data);
av_free(cmov_data);
return ret;
#else
av_log(c->fc, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
return -1;
#endif
}
/* edit list atom */
static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
MOVStreamContext *sc;
int i, edit_count, version;
if (c->fc->nb_streams < 1)
return 0;
sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;
version = avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
edit_count = avio_rb32(pb); /* entries */
if ((uint64_t)edit_count*12+8 > atom.size)
return -1;
for (i=0; i<edit_count; i++){
int64_t time;
int64_t duration;
if (version == 1) {
duration = avio_rb64(pb);
time = avio_rb64(pb);
} else {
duration = avio_rb32(pb); /* segment duration */
time = (int32_t)avio_rb32(pb); /* media time */
}
avio_rb32(pb); /* Media rate */
if (i == 0 && time >= -1) {
sc->time_offset = time != -1 ? time : -duration;
}
}
if (edit_count > 1)
av_log(c->fc, AV_LOG_WARNING, "multiple edit list entries, "
"a/v desync might occur, patch welcome\n");
av_dlog(c->fc, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, edit_count);
return 0;
}
static const MOVParseTableEntry mov_default_parse_table[] = {
{ MKTAG('a','v','s','s'), mov_read_extradata },
{ MKTAG('c','h','p','l'), mov_read_chpl },
{ MKTAG('c','o','6','4'), mov_read_stco },
{ MKTAG('c','t','t','s'), mov_read_ctts }, /* composition time to sample */
{ MKTAG('d','i','n','f'), mov_read_default },
{ MKTAG('d','r','e','f'), mov_read_dref },
{ MKTAG('e','d','t','s'), mov_read_default },
{ MKTAG('e','l','s','t'), mov_read_elst },
{ MKTAG('e','n','d','a'), mov_read_enda },
{ MKTAG('f','i','e','l'), mov_read_extradata },
{ MKTAG('f','t','y','p'), mov_read_ftyp },
{ MKTAG('g','l','b','l'), mov_read_glbl },
{ MKTAG('h','d','l','r'), mov_read_hdlr },
{ MKTAG('i','l','s','t'), mov_read_ilst },
{ MKTAG('j','p','2','h'), mov_read_extradata },
{ MKTAG('m','d','a','t'), mov_read_mdat },
{ MKTAG('m','d','h','d'), mov_read_mdhd },
{ MKTAG('m','d','i','a'), mov_read_default },
{ MKTAG('m','e','t','a'), mov_read_meta },
{ MKTAG('m','i','n','f'), mov_read_default },
{ MKTAG('m','o','o','f'), mov_read_moof },
{ MKTAG('m','o','o','v'), mov_read_moov },
{ MKTAG('m','v','e','x'), mov_read_default },
{ MKTAG('m','v','h','d'), mov_read_mvhd },
{ MKTAG('S','M','I',' '), mov_read_smi }, /* Sorenson extension ??? */
{ MKTAG('a','l','a','c'), mov_read_extradata }, /* alac specific atom */
{ MKTAG('a','v','c','C'), mov_read_glbl },
{ MKTAG('p','a','s','p'), mov_read_pasp },
{ MKTAG('s','t','b','l'), mov_read_default },
{ MKTAG('s','t','c','o'), mov_read_stco },
{ MKTAG('s','t','p','s'), mov_read_stps },
{ MKTAG('s','t','r','f'), mov_read_strf },
{ MKTAG('s','t','s','c'), mov_read_stsc },
{ MKTAG('s','t','s','d'), mov_read_stsd }, /* sample description */
{ MKTAG('s','t','s','s'), mov_read_stss }, /* sync sample */
{ MKTAG('s','t','s','z'), mov_read_stsz }, /* sample size */
{ MKTAG('s','t','t','s'), mov_read_stts },
{ MKTAG('s','t','z','2'), mov_read_stsz }, /* compact sample size */
{ MKTAG('t','k','h','d'), mov_read_tkhd }, /* track header */
{ MKTAG('t','f','h','d'), mov_read_tfhd }, /* track fragment header */
{ MKTAG('t','r','a','k'), mov_read_trak },
{ MKTAG('t','r','a','f'), mov_read_default },
{ MKTAG('t','r','e','f'), mov_read_default },
{ MKTAG('c','h','a','p'), mov_read_chap },
{ MKTAG('t','r','e','x'), mov_read_trex },
{ MKTAG('t','r','u','n'), mov_read_trun },
{ MKTAG('u','d','t','a'), mov_read_default },
{ MKTAG('w','a','v','e'), mov_read_wave },
{ MKTAG('e','s','d','s'), mov_read_esds },
{ MKTAG('d','a','c','3'), mov_read_dac3 }, /* AC-3 info */
{ MKTAG('w','i','d','e'), mov_read_wide }, /* place holder */
{ MKTAG('w','f','e','x'), mov_read_wfex },
{ MKTAG('c','m','o','v'), mov_read_cmov },
{ MKTAG('c','h','a','n'), mov_read_chan }, /* channel layout */
{ 0, NULL }
};
static int mov_probe(AVProbeData *p)
{
unsigned int offset;
uint32_t tag;
int score = 0;
/* check file header */
offset = 0;
for (;;) {
/* ignore invalid offset */
if ((offset + 8) > (unsigned int)p->buf_size)
return score;
tag = AV_RL32(p->buf + offset + 4);
switch(tag) {
/* check for obvious tags */
case MKTAG('j','P',' ',' '): /* jpeg 2000 signature */
case MKTAG('m','o','o','v'):
case MKTAG('m','d','a','t'):
case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
case MKTAG('f','t','y','p'):
return AVPROBE_SCORE_MAX;
/* those are more common words, so rate then a bit less */
case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
case MKTAG('w','i','d','e'):
case MKTAG('f','r','e','e'):
case MKTAG('j','u','n','k'):
case MKTAG('p','i','c','t'):
return AVPROBE_SCORE_MAX - 5;
case MKTAG(0x82,0x82,0x7f,0x7d):
case MKTAG('s','k','i','p'):
case MKTAG('u','u','i','d'):
case MKTAG('p','r','f','l'):
offset = AV_RB32(p->buf+offset) + offset;
/* if we only find those cause probedata is too small at least rate them */
score = AVPROBE_SCORE_MAX - 50;
break;
default:
/* unrecognized tag */
return score;
}
}
}
// must be done after parsing all trak because there's no order requirement
static void mov_read_chapters(AVFormatContext *s)
{
MOVContext *mov = s->priv_data;
AVStream *st = NULL;
MOVStreamContext *sc;
int64_t cur_pos;
int i;
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->id == mov->chapter_track) {
st = s->streams[i];
break;
}
if (!st) {
av_log(s, AV_LOG_ERROR, "Referenced QT chapter track not found\n");
return;
}
st->discard = AVDISCARD_ALL;
sc = st->priv_data;
cur_pos = avio_tell(sc->pb);
for (i = 0; i < st->nb_index_entries; i++) {
AVIndexEntry *sample = &st->index_entries[i];
int64_t end = i+1 < st->nb_index_entries ? st->index_entries[i+1].timestamp : st->duration;
uint8_t *title;
uint16_t ch;
int len, title_len;
if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
av_log(s, AV_LOG_ERROR, "Chapter %d not found in file\n", i);
goto finish;
}
// the first two bytes are the length of the title
len = avio_rb16(sc->pb);
if (len > sample->size-2)
continue;
title_len = 2*len + 1;
if (!(title = av_mallocz(title_len)))
goto finish;
// The samples could theoretically be in any encoding if there's an encd
// atom following, but in practice are only utf-8 or utf-16, distinguished
// instead by the presence of a BOM
if (!len) {
title[0] = 0;
} else {
ch = avio_rb16(sc->pb);
if (ch == 0xfeff)
avio_get_str16be(sc->pb, len, title, title_len);
else if (ch == 0xfffe)
avio_get_str16le(sc->pb, len, title, title_len);
else {
AV_WB16(title, ch);
if (len == 1 || len == 2)
title[len] = 0;
else
avio_get_str(sc->pb, len - 2, title + 2, title_len - 2);
}
}
avpriv_new_chapter(s, i, st->time_base, sample->timestamp, end, title);
av_freep(&title);
}
finish:
avio_seek(sc->pb, cur_pos, SEEK_SET);
}
static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MOVContext *mov = s->priv_data;
AVIOContext *pb = s->pb;
int err;
MOVAtom atom = { AV_RL32("root") };
mov->fc = s;
/* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
if (pb->seekable)
atom.size = avio_size(pb);
else
atom.size = INT64_MAX;
/* check MOV header */
if ((err = mov_read_default(mov, pb, atom)) < 0) {
av_log(s, AV_LOG_ERROR, "error reading header: %d\n", err);
return err;
}
if (!mov->found_moov) {
av_log(s, AV_LOG_ERROR, "moov atom not found\n");
return -1;
}
av_dlog(mov->fc, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));
if (pb->seekable && mov->chapter_track > 0)
mov_read_chapters(s);
return 0;
}
static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
{
AVIndexEntry *sample = NULL;
int64_t best_dts = INT64_MAX;
int i;
for (i = 0; i < s->nb_streams; i++) {
AVStream *avst = s->streams[i];
MOVStreamContext *msc = avst->priv_data;
if (msc->pb && msc->current_sample < avst->nb_index_entries) {
AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
(s->pb->seekable &&
((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
(FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
sample = current_sample;
best_dts = dts;
*st = avst;
}
}
}
return sample;
}
static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MOVContext *mov = s->priv_data;
MOVStreamContext *sc;
AVIndexEntry *sample;
AVStream *st = NULL;
int ret;
retry:
sample = mov_find_next_sample(s, &st);
if (!sample) {
mov->found_mdat = 0;
if (s->pb->seekable||
mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
s->pb->eof_reached)
return AVERROR_EOF;
av_dlog(s, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
goto retry;
}
sc = st->priv_data;
/* must be done just before reading, to avoid infinite loop on sample */
sc->current_sample++;
if (st->discard != AVDISCARD_ALL) {
if (avio_seek(sc->pb, sample->pos, SEEK_SET) != sample->pos) {
av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
sc->ffindex, sample->pos);
return -1;
}
ret = av_get_packet(sc->pb, pkt, sample->size);
if (ret < 0)
return ret;
if (sc->has_palette) {
uint8_t *pal;
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
if (!pal) {
av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");
} else {
memcpy(pal, sc->palette, AVPALETTE_SIZE);
sc->has_palette = 0;
}
}
#if CONFIG_DV_DEMUXER
if (mov->dv_demux && sc->dv_audio_container) {
avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size);
av_free(pkt->data);
pkt->size = 0;
ret = avpriv_dv_get_packet(mov->dv_demux, pkt);
if (ret < 0)
return ret;
}
#endif
}
pkt->stream_index = sc->ffindex;
pkt->dts = sample->timestamp;
if (sc->ctts_data) {
pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
/* update ctts context */
sc->ctts_sample++;
if (sc->ctts_index < sc->ctts_count &&
sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
sc->ctts_index++;
sc->ctts_sample = 0;
}
if (sc->wrong_dts)
pkt->dts = AV_NOPTS_VALUE;
} else {
int64_t next_dts = (sc->current_sample < st->nb_index_entries) ?
st->index_entries[sc->current_sample].timestamp : st->duration;
pkt->duration = next_dts - pkt->dts;
pkt->pts = pkt->dts;
}
if (st->discard == AVDISCARD_ALL)
goto retry;
pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
pkt->pos = sample->pos;
av_dlog(s, "stream %d, pts %"PRId64", dts %"PRId64", pos 0x%"PRIx64", duration %d\n",
pkt->stream_index, pkt->pts, pkt->dts, pkt->pos, pkt->duration);
return 0;
}
static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
{
MOVStreamContext *sc = st->priv_data;
int sample, time_sample;
int i;
sample = av_index_search_timestamp(st, timestamp, flags);
av_dlog(s, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)
sample = 0;
if (sample < 0) /* not sure what to do */
return -1;
sc->current_sample = sample;
av_dlog(s, "stream %d, found sample %d\n", st->index, sc->current_sample);
/* adjust ctts index */
if (sc->ctts_data) {
time_sample = 0;
for (i = 0; i < sc->ctts_count; i++) {
int next = time_sample + sc->ctts_data[i].count;
if (next > sc->current_sample) {
sc->ctts_index = i;
sc->ctts_sample = sc->current_sample - time_sample;
break;
}
time_sample = next;
}
}
return sample;
}
static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
{
AVStream *st;
int64_t seek_timestamp, timestamp;
int sample;
int i;
if (stream_index >= s->nb_streams)
return -1;
if (sample_time < 0)
sample_time = 0;
st = s->streams[stream_index];
sample = mov_seek_stream(s, st, sample_time, flags);
if (sample < 0)
return -1;
/* adjust seek timestamp to found sample timestamp */
seek_timestamp = st->index_entries[sample].timestamp;
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (stream_index == i)
continue;
timestamp = av_rescale_q(seek_timestamp, s->streams[stream_index]->time_base, st->time_base);
mov_seek_stream(s, st, timestamp, flags);
}
return 0;
}
static int mov_read_close(AVFormatContext *s)
{
MOVContext *mov = s->priv_data;
int i, j;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
MOVStreamContext *sc = st->priv_data;
av_freep(&sc->ctts_data);
for (j = 0; j < sc->drefs_count; j++) {
av_freep(&sc->drefs[j].path);
av_freep(&sc->drefs[j].dir);
}
av_freep(&sc->drefs);
if (sc->pb && sc->pb != s->pb)
avio_close(sc->pb);
}
if (mov->dv_demux) {
for (i = 0; i < mov->dv_fctx->nb_streams; i++) {
av_freep(&mov->dv_fctx->streams[i]->codec);
av_freep(&mov->dv_fctx->streams[i]);
}
av_freep(&mov->dv_fctx);
av_freep(&mov->dv_demux);
}
av_freep(&mov->trex_data);
return 0;
}
AVInputFormat ff_mov_demuxer = {
.name = "mov,mp4,m4a,3gp,3g2,mj2",
.long_name = NULL_IF_CONFIG_SMALL("QuickTime/MPEG-4/Motion JPEG 2000 format"),
.priv_data_size = sizeof(MOVContext),
.read_probe = mov_probe,
.read_header = mov_read_header,
.read_packet = mov_read_packet,
.read_close = mov_read_close,
.read_seek = mov_read_seek,
};
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