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FFmpeg/libavformat/iff.c
Diego Elio Pettenò c6610a216e Prefix all _demuxer, _muxer, _protocol from libavformat and libavdevice. 
This also lists the objects from those two libraries as internal (by adding
the ff_ prefix) so that they can then be hidden via linker scripts.
2011-01-26 22:10:09 +00:00

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/*
* IFF (.iff) file demuxer
* Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
* Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
*
* 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
*/
/**
* @file
* IFF file demuxer
* by Jaikrishnan Menon
* for more information on the .iff file format, visit:
* http://wiki.multimedia.cx/index.php?title=IFF
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#define ID_8SVX MKTAG('8','S','V','X')
#define ID_VHDR MKTAG('V','H','D','R')
#define ID_ATAK MKTAG('A','T','A','K')
#define ID_RLSE MKTAG('R','L','S','E')
#define ID_CHAN MKTAG('C','H','A','N')
#define ID_PBM MKTAG('P','B','M',' ')
#define ID_ILBM MKTAG('I','L','B','M')
#define ID_BMHD MKTAG('B','M','H','D')
#define ID_CMAP MKTAG('C','M','A','P')
#define ID_FORM MKTAG('F','O','R','M')
#define ID_ANNO MKTAG('A','N','N','O')
#define ID_AUTH MKTAG('A','U','T','H')
#define ID_CHRS MKTAG('C','H','R','S')
#define ID_COPYRIGHT MKTAG('(','c',')',' ')
#define ID_CSET MKTAG('C','S','E','T')
#define ID_FVER MKTAG('F','V','E','R')
#define ID_NAME MKTAG('N','A','M','E')
#define ID_TEXT MKTAG('T','E','X','T')
#define ID_BODY MKTAG('B','O','D','Y')
#define ID_ANNO MKTAG('A','N','N','O')
#define LEFT 2
#define RIGHT 4
#define STEREO 6
#define PACKET_SIZE 1024
typedef enum {
COMP_NONE,
COMP_FIB,
COMP_EXP
} svx8_compression_type;
typedef enum {
BITMAP_RAW,
BITMAP_BYTERUN1
} bitmap_compression_type;
typedef struct {
uint64_t body_pos;
uint32_t body_size;
uint32_t sent_bytes;
uint32_t audio_frame_count;
} IffDemuxContext;
static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size)
{
uint8_t *end = dest + size;
size = size>>1;
while(dest < end) {
*dest++ = *src;
*dest++ = *(src+size);
src++;
}
}
/* Metadata string read */
static int get_metadata(AVFormatContext *s,
const char *const tag,
const unsigned data_size)
{
uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
if (!buf)
return AVERROR(ENOMEM);
if (get_buffer(s->pb, buf, data_size) < 0) {
av_free(buf);
return AVERROR(EIO);
}
buf[data_size] = 0;
av_metadata_set2(&s->metadata, tag, buf, AV_METADATA_DONT_STRDUP_VAL);
return 0;
}
static int iff_probe(AVProbeData *p)
{
const uint8_t *d = p->buf;
if ( AV_RL32(d) == ID_FORM &&
(AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )
return AVPROBE_SCORE_MAX;
return 0;
}
static int iff_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
IffDemuxContext *iff = s->priv_data;
ByteIOContext *pb = s->pb;
AVStream *st;
uint32_t chunk_id, data_size;
int compression = -1;
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->channels = 1;
url_fskip(pb, 8);
// codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
st->codec->codec_tag = get_le32(pb);
while(!url_feof(pb)) {
uint64_t orig_pos;
int res;
const char *metadata_tag = NULL;
chunk_id = get_le32(pb);
data_size = get_be32(pb);
orig_pos = url_ftell(pb);
switch(chunk_id) {
case ID_VHDR:
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
if (data_size < 14)
return AVERROR_INVALIDDATA;
url_fskip(pb, 12);
st->codec->sample_rate = get_be16(pb);
if (data_size >= 16) {
url_fskip(pb, 1);
compression = get_byte(pb);
}
break;
case ID_BODY:
iff->body_pos = url_ftell(pb);
iff->body_size = data_size;
break;
case ID_CHAN:
if (data_size < 4)
return AVERROR_INVALIDDATA;
st->codec->channels = (get_be32(pb) < 6) ? 1 : 2;
break;
case ID_CMAP:
st->codec->extradata_size = data_size;
st->codec->extradata = av_malloc(data_size);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
if (get_buffer(pb, st->codec->extradata, data_size) < 0)
return AVERROR(EIO);
break;
case ID_BMHD:
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
if (data_size <= 8)
return AVERROR_INVALIDDATA;
st->codec->width = get_be16(pb);
st->codec->height = get_be16(pb);
url_fskip(pb, 4); // x, y offset
st->codec->bits_per_coded_sample = get_byte(pb);
if (data_size >= 11) {
url_fskip(pb, 1); // masking
compression = get_byte(pb);
}
if (data_size >= 16) {
url_fskip(pb, 3); // paddding, transparent
st->sample_aspect_ratio.num = get_byte(pb);
st->sample_aspect_ratio.den = get_byte(pb);
}
break;
case ID_ANNO:
case ID_TEXT:
metadata_tag = "comment";
break;
case ID_AUTH:
metadata_tag = "artist";
break;
case ID_COPYRIGHT:
metadata_tag = "copyright";
break;
case ID_NAME:
metadata_tag = "title";
break;
}
if (metadata_tag) {
if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
return res;
}
}
url_fskip(pb, data_size - (url_ftell(pb) - orig_pos) + (data_size & 1));
}
url_fseek(pb, iff->body_pos, SEEK_SET);
switch(st->codec->codec_type) {
case AVMEDIA_TYPE_AUDIO:
av_set_pts_info(st, 32, 1, st->codec->sample_rate);
switch(compression) {
case COMP_NONE:
st->codec->codec_id = CODEC_ID_PCM_S8;
break;
case COMP_FIB:
st->codec->codec_id = CODEC_ID_8SVX_FIB;
break;
case COMP_EXP:
st->codec->codec_id = CODEC_ID_8SVX_EXP;
break;
default:
av_log(s, AV_LOG_ERROR, "unknown compression method\n");
return -1;
}
st->codec->bits_per_coded_sample = 8;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
break;
case AVMEDIA_TYPE_VIDEO:
switch (compression) {
case BITMAP_RAW:
st->codec->codec_id = CODEC_ID_IFF_ILBM;
break;
case BITMAP_BYTERUN1:
st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
break;
default:
av_log(s, AV_LOG_ERROR, "unknown compression method\n");
return AVERROR_INVALIDDATA;
}
break;
default:
return -1;
}
return 0;
}
static int iff_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
IffDemuxContext *iff = s->priv_data;
ByteIOContext *pb = s->pb;
AVStream *st = s->streams[0];
int ret;
if(iff->sent_bytes >= iff->body_size)
return AVERROR(EIO);
if(st->codec->channels == 2) {
uint8_t sample_buffer[PACKET_SIZE];
ret = get_buffer(pb, sample_buffer, PACKET_SIZE);
if(av_new_packet(pkt, PACKET_SIZE) < 0) {
av_log(s, AV_LOG_ERROR, "cannot allocate packet\n");
return AVERROR(ENOMEM);
}
interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE);
} else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
ret = av_get_packet(pb, pkt, iff->body_size);
} else {
ret = av_get_packet(pb, pkt, PACKET_SIZE);
}
if(iff->sent_bytes == 0)
pkt->flags |= AV_PKT_FLAG_KEY;
if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
iff->sent_bytes += PACKET_SIZE;
} else {
iff->sent_bytes = iff->body_size;
}
pkt->stream_index = 0;
if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
pkt->pts = iff->audio_frame_count;
iff->audio_frame_count += ret / st->codec->channels;
}
return ret;
}
AVInputFormat ff_iff_demuxer = {
"IFF",
NULL_IF_CONFIG_SMALL("IFF format"),
sizeof(IffDemuxContext),
iff_probe,
iff_read_header,
iff_read_packet,
};
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