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FFmpeg/libavformat/asf.c
Ronald S. Bultje f27544fd5b Separate the packet fetching from the data reading, so that the data reading 
function is assured to parse at most one packet. This makes this function
useful for ASF data packet parsing in a "push-mode" in addition to the
current "pull-mode", and therefore allows for use of these functions in,
for example, the RTSP demuxer (for MS-RTSP support). Tested to give identical
output before and after for regular ASF playback, also see discussion in the
ML thread "[PATCH] asf.c: move packet_time_start=0 statement". Testsuite also
works after the patch, tested by Benoit Fouet.

Originally committed as revision 16108 to svn://svn.ffmpeg.org/ffmpeg/trunk
2008-12-13 17:18:11 +00:00

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/*
* ASF compatible demuxer
* Copyright (c) 2000, 2001 Fabrice Bellard.
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "libavcodec/mpegaudio.h"
#include "avformat.h"
#include "riff.h"
#include "asf.h"
#include "asfcrypt.h"
void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
#undef NDEBUG
#include <assert.h>
#define FRAME_HEADER_SIZE 17
// Fix Me! FRAME_HEADER_SIZE may be different.
static const GUID index_guid = {
0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
};
static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
};
/**********************************/
/* decoding */
//#define DEBUG
#ifdef DEBUG
#define PRINT_IF_GUID(g,cmp) \
if (!memcmp(g, &cmp, sizeof(GUID))) \
dprintf(NULL, "(GUID: %s) ", #cmp)
static void print_guid(const GUID *g)
{
int i;
PRINT_IF_GUID(g, asf_header);
else PRINT_IF_GUID(g, file_header);
else PRINT_IF_GUID(g, stream_header);
else PRINT_IF_GUID(g, audio_stream);
else PRINT_IF_GUID(g, audio_conceal_none);
else PRINT_IF_GUID(g, video_stream);
else PRINT_IF_GUID(g, video_conceal_none);
else PRINT_IF_GUID(g, command_stream);
else PRINT_IF_GUID(g, comment_header);
else PRINT_IF_GUID(g, codec_comment_header);
else PRINT_IF_GUID(g, codec_comment1_header);
else PRINT_IF_GUID(g, data_header);
else PRINT_IF_GUID(g, index_guid);
else PRINT_IF_GUID(g, head1_guid);
else PRINT_IF_GUID(g, head2_guid);
else PRINT_IF_GUID(g, my_guid);
else PRINT_IF_GUID(g, ext_stream_header);
else PRINT_IF_GUID(g, extended_content_header);
else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
else PRINT_IF_GUID(g, ext_stream_audio_stream);
else PRINT_IF_GUID(g, metadata_header);
else PRINT_IF_GUID(g, stream_bitrate_guid);
else
dprintf(NULL, "(GUID: unknown) ");
for(i=0;i<16;i++)
dprintf(NULL, " 0x%02x,", (*g)[i]);
dprintf(NULL, "}\n");
}
#undef PRINT_IF_GUID
#else
#define print_guid(g)
#endif
static void get_guid(ByteIOContext *s, GUID *g)
{
assert(sizeof(*g) == 16);
get_buffer(s, *g, sizeof(*g));
}
#if 0
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
{
int len, c;
char *q;
len = get_le16(pb);
q = buf;
while (len > 0) {
c = get_le16(pb);
if ((q - buf) < buf_size - 1)
*q++ = c;
len--;
}
*q = '\0';
}
#endif
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
{
char* q = buf;
len /= 2;
while (len--) {
uint8_t tmp;
PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
}
*q = '\0';
}
static int asf_probe(AVProbeData *pd)
{
/* check file header */
if (!memcmp(pd->buf, &asf_header, sizeof(GUID)))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int get_value(ByteIOContext *pb, int type){
switch(type){
case 2: return get_le32(pb);
case 3: return get_le32(pb);
case 4: return get_le64(pb);
case 5: return get_le16(pb);
default:return INT_MIN;
}
}
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
ASFContext *asf = s->priv_data;
GUID g;
ByteIOContext *pb = s->pb;
AVStream *st;
ASFStream *asf_st;
int size, i;
int64_t gsize;
AVRational dar[128];
uint32_t bitrate[128];
memset(dar, 0, sizeof(dar));
memset(bitrate, 0, sizeof(bitrate));
get_guid(pb, &g);
if (memcmp(&g, &asf_header, sizeof(GUID)))
return -1;
get_le64(pb);
get_le32(pb);
get_byte(pb);
get_byte(pb);
memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
for(;;) {
get_guid(pb, &g);
gsize = get_le64(pb);
dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
print_guid(&g);
dprintf(s, " size=0x%"PRIx64"\n", gsize);
if (!memcmp(&g, &data_header, sizeof(GUID))) {
asf->data_object_offset = url_ftell(pb);
// if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
asf->data_object_size = gsize - 24;
} else {
asf->data_object_size = (uint64_t)-1;
}
break;
}
if (gsize < 24)
return -1;
if (!memcmp(&g, &file_header, sizeof(GUID))) {
get_guid(pb, &asf->hdr.guid);
asf->hdr.file_size = get_le64(pb);
asf->hdr.create_time = get_le64(pb);
asf->nb_packets = get_le64(pb);
asf->hdr.play_time = get_le64(pb);
asf->hdr.send_time = get_le64(pb);
asf->hdr.preroll = get_le32(pb);
asf->hdr.ignore = get_le32(pb);
asf->hdr.flags = get_le32(pb);
asf->hdr.min_pktsize = get_le32(pb);
asf->hdr.max_pktsize = get_le32(pb);
asf->hdr.max_bitrate = get_le32(pb);
asf->packet_size = asf->hdr.max_pktsize;
} else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
enum CodecType type;
int type_specific_size, sizeX;
uint64_t total_size;
unsigned int tag1;
int64_t pos1, pos2, start_time;
int test_for_ext_stream_audio, is_dvr_ms_audio=0;
pos1 = url_ftell(pb);
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
asf_st = av_mallocz(sizeof(ASFStream));
if (!asf_st)
return AVERROR(ENOMEM);
st->priv_data = asf_st;
start_time = asf->hdr.preroll;
if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
st->duration = asf->hdr.send_time /
(10000000 / 1000) - start_time;
}
get_guid(pb, &g);
test_for_ext_stream_audio = 0;
if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
type = CODEC_TYPE_AUDIO;
} else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
type = CODEC_TYPE_VIDEO;
} else if (!memcmp(&g, &command_stream, sizeof(GUID))) {
type = CODEC_TYPE_DATA;
} else if (!memcmp(&g, &ext_stream_embed_stream_header, sizeof(GUID))) {
test_for_ext_stream_audio = 1;
type = CODEC_TYPE_UNKNOWN;
} else {
return -1;
}
get_guid(pb, &g);
total_size = get_le64(pb);
type_specific_size = get_le32(pb);
get_le32(pb);
st->id = get_le16(pb) & 0x7f; /* stream id */
// mapping of asf ID to AV stream ID;
asf->asfid2avid[st->id] = s->nb_streams - 1;
get_le32(pb);
if (test_for_ext_stream_audio) {
get_guid(pb, &g);
if (!memcmp(&g, &ext_stream_audio_stream, sizeof(GUID))) {
type = CODEC_TYPE_AUDIO;
is_dvr_ms_audio=1;
get_guid(pb, &g);
get_le32(pb);
get_le32(pb);
get_le32(pb);
get_guid(pb, &g);
get_le32(pb);
}
}
st->codec->codec_type = type;
if (type == CODEC_TYPE_AUDIO) {
get_wav_header(pb, st->codec, type_specific_size);
if (is_dvr_ms_audio) {
// codec_id and codec_tag are unreliable in dvr_ms
// files. Set them later by probing stream.
st->codec->codec_id = CODEC_ID_PROBE;
st->codec->codec_tag = 0;
}
st->need_parsing = AVSTREAM_PARSE_FULL;
/* We have to init the frame size at some point .... */
pos2 = url_ftell(pb);
if (gsize >= (pos2 + 8 - pos1 + 24)) {
asf_st->ds_span = get_byte(pb);
asf_st->ds_packet_size = get_le16(pb);
asf_st->ds_chunk_size = get_le16(pb);
get_le16(pb); //ds_data_size
get_byte(pb); //ds_silence_data
}
//printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
// asf_st->ds_packet_size, asf_st->ds_chunk_size,
// asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
if (asf_st->ds_span > 1) {
if (!asf_st->ds_chunk_size
|| (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
|| asf_st->ds_packet_size % asf_st->ds_chunk_size)
asf_st->ds_span = 0; // disable descrambling
}
switch (st->codec->codec_id) {
case CODEC_ID_MP3:
st->codec->frame_size = MPA_FRAME_SIZE;
break;
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
st->codec->frame_size = 1;
break;
default:
/* This is probably wrong, but it prevents a crash later */
st->codec->frame_size = 1;
break;
}
} else if (type == CODEC_TYPE_VIDEO) {
get_le32(pb);
get_le32(pb);
get_byte(pb);
size = get_le16(pb); /* size */
sizeX= get_le32(pb); /* size */
st->codec->width = get_le32(pb);
st->codec->height = get_le32(pb);
/* not available for asf */
get_le16(pb); /* panes */
st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
tag1 = get_le32(pb);
url_fskip(pb, 20);
// av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
size= sizeX;
if (size > 40) {
st->codec->extradata_size = size - 40;
st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
}
/* Extract palette from extradata if bpp <= 8 */
/* This code assumes that extradata contains only palette */
/* This is true for all paletted codecs implemented in ffmpeg */
if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
#ifdef WORDS_BIGENDIAN
for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
#else
memcpy(st->codec->palctrl->palette, st->codec->extradata,
FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
#endif
st->codec->palctrl->palette_changed = 1;
}
st->codec->codec_tag = tag1;
st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
if(tag1 == MKTAG('D', 'V', 'R', ' '))
st->need_parsing = AVSTREAM_PARSE_FULL;
}
pos2 = url_ftell(pb);
url_fskip(pb, gsize - (pos2 - pos1 + 24));
} else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
int len1, len2, len3, len4, len5;
len1 = get_le16(pb);
len2 = get_le16(pb);
len3 = get_le16(pb);
len4 = get_le16(pb);
len5 = get_le16(pb);
get_str16_nolen(pb, len1, s->title , sizeof(s->title));
get_str16_nolen(pb, len2, s->author , sizeof(s->author));
get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
get_str16_nolen(pb, len4, s->comment , sizeof(s->comment));
url_fskip(pb, len5);
} else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
int stream_count = get_le16(pb);
int j;
// av_log(NULL, AV_LOG_ERROR, "stream bitrate properties\n");
// av_log(NULL, AV_LOG_ERROR, "streams %d\n", streams);
for(j = 0; j < stream_count; j++) {
int flags, bitrate, stream_id;
flags= get_le16(pb);
bitrate= get_le32(pb);
stream_id= (flags & 0x7f);
// av_log(NULL, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
asf->stream_bitrates[stream_id]= bitrate;
}
} else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
int desc_count, i;
desc_count = get_le16(pb);
for(i=0;i<desc_count;i++)
{
int name_len,value_type,value_len;
uint64_t value_num = 0;
char name[1024];
name_len = get_le16(pb);
get_str16_nolen(pb, name_len, name, sizeof(name));
value_type = get_le16(pb);
value_len = get_le16(pb);
if (value_type <= 1) // unicode or byte
{
if (!strcmp(name,"WM/AlbumTitle")) get_str16_nolen(pb, value_len, s->album, sizeof(s->album));
else if(!strcmp(name,"WM/Genre" )) get_str16_nolen(pb, value_len, s->genre, sizeof(s->genre));
else if(!strcmp(name,"WM/Year" )) {
char year[8];
get_str16_nolen(pb, value_len, year, sizeof(year));
s->year = atoi(year);
}
else if(!strcmp(name,"WM/Track") && s->track == 0) {
char track[8];
get_str16_nolen(pb, value_len, track, sizeof(track));
s->track = strtol(track, NULL, 10) + 1;
}
else if(!strcmp(name,"WM/TrackNumber")) {
char track[8];
get_str16_nolen(pb, value_len, track, sizeof(track));
s->track = strtol(track, NULL, 10);
}
else url_fskip(pb, value_len);
}
else if (value_type <= 5) // boolean or DWORD or QWORD or WORD
{
value_num= get_value(pb, value_type);
if (!strcmp(name,"WM/Track" ) && s->track == 0) s->track = value_num + 1;
if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
}else
url_fskip(pb, value_len);
}
} else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
int n, stream_num, name_len, value_len, value_type, value_num;
n = get_le16(pb);
for(i=0;i<n;i++) {
char name[1024];
get_le16(pb); //lang_list_index
stream_num= get_le16(pb);
name_len= get_le16(pb);
value_type= get_le16(pb);
value_len= get_le32(pb);
get_str16_nolen(pb, name_len, name, sizeof(name));
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
url_fskip(pb, value_len - 2);
if(stream_num<128){
if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
}
}
} else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
int ext_len, payload_ext_ct, stream_ct;
uint32_t ext_d, leak_rate, stream_num;
int64_t pos_ex_st;
pos_ex_st = url_ftell(pb);
get_le64(pb); // starttime
get_le64(pb); // endtime
leak_rate = get_le32(pb); // leak-datarate
get_le32(pb); // bucket-datasize
get_le32(pb); // init-bucket-fullness
get_le32(pb); // alt-leak-datarate
get_le32(pb); // alt-bucket-datasize
get_le32(pb); // alt-init-bucket-fullness
get_le32(pb); // max-object-size
get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
stream_num = get_le16(pb); // stream-num
get_le16(pb); // stream-language-id-index
get_le64(pb); // avg frametime in 100ns units
stream_ct = get_le16(pb); //stream-name-count
payload_ext_ct = get_le16(pb); //payload-extension-system-count
if (stream_num < 128)
bitrate[stream_num] = leak_rate;
for (i=0; i<stream_ct; i++){
get_le16(pb);
ext_len = get_le16(pb);
url_fseek(pb, ext_len, SEEK_CUR);
}
for (i=0; i<payload_ext_ct; i++){
get_guid(pb, &g);
ext_d=get_le16(pb);
ext_len=get_le32(pb);
url_fseek(pb, ext_len, SEEK_CUR);
}
// there could be a optional stream properties object to follow
// if so the next iteration will pick it up
} else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
int v1, v2;
get_guid(pb, &g);
v1 = get_le32(pb);
v2 = get_le16(pb);
#if 0
} else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
int len, v1, n, num;
char str[256], *q;
char tag[16];
get_guid(pb, &g);
print_guid(&g);
n = get_le32(pb);
for(i=0;i<n;i++) {
num = get_le16(pb); /* stream number */
get_str16(pb, str, sizeof(str));
get_str16(pb, str, sizeof(str));
len = get_le16(pb);
q = tag;
while (len > 0) {
v1 = get_byte(pb);
if ((q - tag) < sizeof(tag) - 1)
*q++ = v1;
len--;
}
*q = '\0';
}
#endif
} else if (url_feof(pb)) {
return -1;
} else {
url_fseek(pb, gsize - 24, SEEK_CUR);
}
}
get_guid(pb, &g);
get_le64(pb);
get_byte(pb);
get_byte(pb);
if (url_feof(pb))
return -1;
asf->data_offset = url_ftell(pb);
asf->packet_size_left = 0;
for(i=0; i<128; i++){
int stream_num= asf->asfid2avid[i];
if(stream_num>=0){
AVStream *st = s->streams[stream_num];
if (!st->codec->bit_rate)
st->codec->bit_rate = bitrate[i];
if (dar[i].num > 0 && dar[i].den > 0)
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
dar[i].num, dar[i].den, INT_MAX);
//av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
}
}
return 0;
}
#define DO_2BITS(bits, var, defval) \
switch (bits & 3) \
{ \
case 3: var = get_le32(pb); rsize += 4; break; \
case 2: var = get_le16(pb); rsize += 2; break; \
case 1: var = get_byte(pb); rsize++; break; \
default: var = defval; break; \
}
/**
*
* @return <0 in case of an error
*/
static int asf_get_packet(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
ByteIOContext *pb = s->pb;
uint32_t packet_length, padsize;
int rsize = 8;
int c, d, e, off;
off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
c=d=e=-1;
while(off-- > 0){
c=d; d=e;
e= get_byte(pb);
if(c == 0x82 && !d && !e)
break;
}
if (c != 0x82) {
if (!url_feof(pb))
av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%"PRId64"\n", c, url_ftell(pb));
}
if ((c & 0x8f) == 0x82) {
if (d || e) {
if (!url_feof(pb))
av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
return -1;
}
c= get_byte(pb);
d= get_byte(pb);
rsize+=3;
}else{
url_fseek(pb, -1, SEEK_CUR); //FIXME
}
asf->packet_flags = c;
asf->packet_property = d;
DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
//the following checks prevent overflows and infinite loops
if(packet_length >= (1U<<29)){
av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
return -1;
}
if(padsize >= packet_length){
av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
return -1;
}
asf->packet_timestamp = get_le32(pb);
get_le16(pb); /* duration */
// rsize has at least 11 bytes which have to be present
if (asf->packet_flags & 0x01) {
asf->packet_segsizetype = get_byte(pb); rsize++;
asf->packet_segments = asf->packet_segsizetype & 0x3f;
} else {
asf->packet_segments = 1;
asf->packet_segsizetype = 0x80;
}
asf->packet_size_left = packet_length - padsize - rsize;
if (packet_length < asf->hdr.min_pktsize)
padsize += asf->hdr.min_pktsize - packet_length;
asf->packet_padsize = padsize;
dprintf(s, "packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
return 0;
}
/**
*
* @return <0 if error
*/
static int asf_read_frame_header(AVFormatContext *s){
ASFContext *asf = s->priv_data;
ByteIOContext *pb = s->pb;
int rsize = 1;
int num = get_byte(pb);
int64_t ts0, ts1;
asf->packet_segments--;
asf->packet_key_frame = num >> 7;
asf->stream_index = asf->asfid2avid[num & 0x7f];
// sequence should be ignored!
DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
//printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
if (asf->packet_replic_size >= 8) {
asf->packet_obj_size = get_le32(pb);
if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
return -1;
}
asf->packet_frag_timestamp = get_le32(pb); // timestamp
if(asf->packet_replic_size >= 8+38+4){
// for(i=0; i<asf->packet_replic_size-8; i++)
// av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
// av_log(s, AV_LOG_DEBUG, "\n");
url_fskip(pb, 10);
ts0= get_le64(pb);
ts1= get_le64(pb);
url_fskip(pb, 12);
get_le32(pb);
url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
else asf->packet_frag_timestamp= AV_NOPTS_VALUE;
}else
url_fskip(pb, asf->packet_replic_size - 8);
rsize += asf->packet_replic_size; // FIXME - check validity
} else if (asf->packet_replic_size==1){
// multipacket - frag_offset is beginning timestamp
asf->packet_time_start = asf->packet_frag_offset;
asf->packet_frag_offset = 0;
asf->packet_frag_timestamp = asf->packet_timestamp;
asf->packet_time_delta = get_byte(pb);
rsize++;
}else if(asf->packet_replic_size!=0){
av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
return -1;
}
if (asf->packet_flags & 0x01) {
DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
if(asf->packet_frag_size > asf->packet_size_left - rsize){
av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
return -1;
}
//printf("Fragsize %d\n", asf->packet_frag_size);
} else {
asf->packet_frag_size = asf->packet_size_left - rsize;
//printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
}
if (asf->packet_replic_size == 1) {
asf->packet_multi_size = asf->packet_frag_size;
if (asf->packet_multi_size > asf->packet_size_left)
return -1;
}
asf->packet_size_left -= rsize;
//printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
return 0;
}
/**
* Parse data from individual ASF packets (which were previously loaded
* with asf_get_packet()).
* @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
* packets need to be loaded (through asf_get_packet())
*/
static int asf_parse_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
ASFStream *asf_st = 0;
ByteIOContext *pb = s->pb;
for (;;) {
if(url_feof(pb))
return AVERROR(EIO);
if (asf->packet_size_left < FRAME_HEADER_SIZE
|| asf->packet_segments < 1) {
//asf->packet_size_left <= asf->packet_padsize) {
int ret = asf->packet_size_left + asf->packet_padsize;
//printf("PacketLeftSize:%d Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
assert(ret>=0);
/* fail safe */
url_fskip(pb, ret);
asf->packet_pos= url_ftell(pb);
if (asf->data_object_size != (uint64_t)-1 &&
(asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
return AVERROR(EIO); /* Do not exceed the size of the data object */
return 1;
}
if (asf->packet_time_start == 0) {
if(asf_read_frame_header(s) < 0){
asf->packet_segments= 0;
continue;
}
if (asf->stream_index < 0
|| s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
|| (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
) {
asf->packet_time_start = 0;
/* unhandled packet (should not happen) */
url_fskip(pb, asf->packet_frag_size);
asf->packet_size_left -= asf->packet_frag_size;
if(asf->stream_index < 0)
av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
continue;
}
asf->asf_st = s->streams[asf->stream_index]->priv_data;
}
asf_st = asf->asf_st;
if (asf->packet_replic_size == 1) {
// frag_offset is here used as the beginning timestamp
asf->packet_frag_timestamp = asf->packet_time_start;
asf->packet_time_start += asf->packet_time_delta;
asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
asf->packet_size_left--;
asf->packet_multi_size--;
if (asf->packet_multi_size < asf->packet_obj_size)
{
asf->packet_time_start = 0;
url_fskip(pb, asf->packet_multi_size);
asf->packet_size_left -= asf->packet_multi_size;
continue;
}
asf->packet_multi_size -= asf->packet_obj_size;
//printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
}
if( /*asf->packet_frag_size == asf->packet_obj_size*/
asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
&& asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
asf_st->frag_offset, asf->packet_frag_size,
asf->packet_obj_size, asf_st->pkt.size);
asf->packet_obj_size= asf_st->pkt.size;
}
if ( asf_st->pkt.size != asf->packet_obj_size
|| asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
if(asf_st->pkt.data){
av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
asf_st->frag_offset = 0;
av_free_packet(&asf_st->pkt);
}
/* new packet */
av_new_packet(&asf_st->pkt, asf->packet_obj_size);
asf_st->seq = asf->packet_seq;
asf_st->pkt.dts = asf->packet_frag_timestamp;
asf_st->pkt.stream_index = asf->stream_index;
asf_st->pkt.pos =
asf_st->packet_pos= asf->packet_pos;
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
asf->packet_key_frame = 1;
if (asf->packet_key_frame)
asf_st->pkt.flags |= PKT_FLAG_KEY;
}
/* read data */
//printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
// asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
// asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
asf->packet_size_left -= asf->packet_frag_size;
if (asf->packet_size_left < 0)
continue;
if( asf->packet_frag_offset >= asf_st->pkt.size
|| asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
continue;
}
get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
asf->packet_frag_size);
if (s->key && s->keylen == 20)
ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
asf->packet_frag_size);
asf_st->frag_offset += asf->packet_frag_size;
/* test if whole packet is read */
if (asf_st->frag_offset == asf_st->pkt.size) {
//workaround for macroshit radio DVR-MS files
if( s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
&& asf_st->pkt.size > 100){
int i;
for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
if(i == asf_st->pkt.size){
av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
asf_st->frag_offset = 0;
av_free_packet(&asf_st->pkt);
continue;
}
}
/* return packet */
if (asf_st->ds_span > 1) {
if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
}else{
/* packet descrambling */
uint8_t *newdata = av_malloc(asf_st->pkt.size);
if (newdata) {
int offset = 0;
while (offset < asf_st->pkt.size) {
int off = offset / asf_st->ds_chunk_size;
int row = off / asf_st->ds_span;
int col = off % asf_st->ds_span;
int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
//printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
memcpy(newdata + offset,
asf_st->pkt.data + idx * asf_st->ds_chunk_size,
asf_st->ds_chunk_size);
offset += asf_st->ds_chunk_size;
}
av_free(asf_st->pkt.data);
asf_st->pkt.data = newdata;
}
}
}
asf_st->frag_offset = 0;
*pkt= asf_st->pkt;
//printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
asf_st->pkt.size = 0;
asf_st->pkt.data = 0;
break; // packet completed
}
}
return 0;
}
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
for (;;) {
int ret;
/* parse cached packets, if any */
if ((ret = asf_parse_packet(s, pkt)) <= 0)
return ret;
if ((ret = asf_get_packet(s)) < 0)
assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
asf->packet_time_start = 0;
}
return 0;
}
// Added to support seeking after packets have been read
// If information is not reset, read_packet fails due to
// leftover information from previous reads
static void asf_reset_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
ASFStream *asf_st;
int i;
asf->packet_nb_frames = 0;
asf->packet_size_left = 0;
asf->packet_segments = 0;
asf->packet_flags = 0;
asf->packet_property = 0;
asf->packet_timestamp = 0;
asf->packet_segsizetype = 0;
asf->packet_segments = 0;
asf->packet_seq = 0;
asf->packet_replic_size = 0;
asf->packet_key_frame = 0;
asf->packet_padsize = 0;
asf->packet_frag_offset = 0;
asf->packet_frag_size = 0;
asf->packet_frag_timestamp = 0;
asf->packet_multi_size = 0;
asf->packet_obj_size = 0;
asf->packet_time_delta = 0;
asf->packet_time_start = 0;
for(i=0; i<s->nb_streams; i++){
asf_st= s->streams[i]->priv_data;
av_free_packet(&asf_st->pkt);
asf_st->frag_offset=0;
asf_st->seq=0;
}
asf->asf_st= NULL;
}
static int asf_read_close(AVFormatContext *s)
{
int i;
asf_reset_header(s);
for(i=0;i<s->nb_streams;i++) {
AVStream *st = s->streams[i];
av_free(st->codec->palctrl);
}
return 0;
}
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
{
ASFContext *asf = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
ASFStream *asf_st;
int64_t pts;
int64_t pos= *ppos;
int i;
int64_t start_pos[s->nb_streams];
for(i=0; i<s->nb_streams; i++){
start_pos[i]= pos;
}
pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
*ppos= pos;
url_fseek(s->pb, pos, SEEK_SET);
//printf("asf_read_pts\n");
asf_reset_header(s);
for(;;){
if (av_read_frame(s, pkt) < 0){
av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
return AV_NOPTS_VALUE;
}
pts= pkt->pts;
av_free_packet(pkt);
if(pkt->flags&PKT_FLAG_KEY){
i= pkt->stream_index;
asf_st= s->streams[i]->priv_data;
// assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
pos= asf_st->packet_pos;
av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
start_pos[i]= asf_st->packet_pos + 1;
if(pkt->stream_index == stream_index)
break;
}
}
*ppos= pos;
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
return pts;
}
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
{
GUID g;
ASFContext *asf = s->priv_data;
int64_t gsize, itime;
int64_t pos, current_pos, index_pts;
int i;
int pct,ict;
current_pos = url_ftell(s->pb);
url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
get_guid(s->pb, &g);
if (!memcmp(&g, &index_guid, sizeof(GUID))) {
gsize = get_le64(s->pb);
get_guid(s->pb, &g);
itime=get_le64(s->pb);
pct=get_le32(s->pb);
ict=get_le32(s->pb);
av_log(NULL, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
for (i=0;i<ict;i++){
int pktnum=get_le32(s->pb);
int pktct =get_le16(s->pb);
av_log(NULL, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
pos=s->data_offset + asf->packet_size*(int64_t)pktnum;
index_pts=av_rescale(itime, i, 10000);
av_add_index_entry(s->streams[stream_index], pos, index_pts, asf->packet_size, 0, AVINDEX_KEYFRAME);
}
asf->index_read= 1;
}
url_fseek(s->pb, current_pos, SEEK_SET);
}
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
{
ASFContext *asf = s->priv_data;
AVStream *st = s->streams[stream_index];
int64_t pos;
int index;
if (asf->packet_size <= 0)
return -1;
/* Try using the protocol's read_seek if available */
if(s->pb) {
int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
if(ret >= 0)
asf_reset_header(s);
if (ret != AVERROR(ENOSYS))
return ret;
}
if (!asf->index_read)
asf_build_simple_index(s, stream_index);
if(!(asf->index_read && st->index_entries)){
if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
return -1;
}else{
index= av_index_search_timestamp(st, pts, flags);
if(index<0)
return -1;
/* find the position */
pos = st->index_entries[index].pos;
pts = st->index_entries[index].timestamp;
// various attempts to find key frame have failed so far
// asf_reset_header(s);
// url_fseek(s->pb, pos, SEEK_SET);
// key_pos = pos;
// for(i=0;i<16;i++){
// pos = url_ftell(s->pb);
// if (av_read_frame(s, &pkt) < 0){
// av_log(s, AV_LOG_INFO, "seek failed\n");
// return -1;
// }
// asf_st = s->streams[stream_index]->priv_data;
// pos += st->parser->frame_offset;
//
// if (pkt.size > b) {
// b = pkt.size;
// key_pos = pos;
// }
//
// av_free_packet(&pkt);
// }
/* do the seek */
av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
url_fseek(s->pb, pos, SEEK_SET);
}
asf_reset_header(s);
return 0;
}
AVInputFormat asf_demuxer = {
"asf",
NULL_IF_CONFIG_SMALL("ASF format"),
sizeof(ASFContext),
asf_probe,
asf_read_header,
asf_read_packet,
asf_read_close,
asf_read_seek,
asf_read_pts,
};
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