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ffmpeg/libavformat/siff.c

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/*
* Beam Software SIFF demuxer
* Copyright (c) 2007 Konstantin Shishkov
*
* 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/intreadwrite.h"
#include "avformat.h"
enum SIFFTags{
TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
};
enum VBFlags{
VB_HAS_GMC = 0x01,
VB_HAS_AUDIO = 0x04,
VB_HAS_VIDEO = 0x08,
VB_HAS_PALETTE = 0x10,
VB_HAS_LENGTH = 0x20
};
typedef struct SIFFContext{
int frames;
int cur_frame;
int rate;
int bits;
int block_align;
int has_video;
int has_audio;
int curstrm;
int pktsize;
int gmcsize;
int sndsize;
int flags;
uint8_t gmc[4];
}SIFFContext;
static int siff_probe(AVProbeData *p)
{
uint32_t tag = AV_RL32(p->buf + 8);
/* check file header */
if (AV_RL32(p->buf) != TAG_SIFF ||
(tag != TAG_VBV1 && tag != TAG_SOUN))
return 0;
return AVPROBE_SCORE_MAX;
}
static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
{
AVStream *ast;
ast = av_new_stream(s, 0);
if (!ast)
return -1;
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codec->codec_id = CODEC_ID_PCM_U8;
ast->codec->channels = 1;
ast->codec->bits_per_coded_sample = c->bits;
ast->codec->sample_rate = c->rate;
ast->codec->frame_size = c->block_align;
av_set_pts_info(ast, 16, 1, c->rate);
return 0;
}
static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
{
AVStream *st;
int width, height;
if (avio_rl32(pb) != TAG_VBHD){
av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
return -1;
}
if(avio_rb32(pb) != 32){
av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
return -1;
}
if(avio_rl16(pb) != 1){
av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
return -1;
}
width = avio_rl16(pb);
height = avio_rl16(pb);
avio_skip(pb, 4);
c->frames = avio_rl16(pb);
if(!c->frames){
av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
return -1;
}
c->bits = avio_rl16(pb);
c->rate = avio_rl16(pb);
c->block_align = c->rate * (c->bits >> 3);
avio_skip(pb, 16); //zeroes
st = av_new_stream(s, 0);
if (!st)
return -1;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_VB;
st->codec->codec_tag = MKTAG('V', 'B', 'V', '1');
st->codec->width = width;
st->codec->height = height;
st->codec->pix_fmt = PIX_FMT_PAL8;
av_set_pts_info(st, 16, 1, 12);
c->cur_frame = 0;
c->has_video = 1;
c->has_audio = !!c->rate;
c->curstrm = -1;
if (c->has_audio && create_audio_stream(s, c) < 0)
return -1;
return 0;
}
static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
{
if (avio_rl32(pb) != TAG_SHDR){
av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
return -1;
}
if(avio_rb32(pb) != 8){
av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
return -1;
}
avio_skip(pb, 4); //unknown value
c->rate = avio_rl16(pb);
c->bits = avio_rl16(pb);
c->block_align = c->rate * (c->bits >> 3);
return create_audio_stream(s, c);
}
static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVIOContext *pb = s->pb;
SIFFContext *c = s->priv_data;
uint32_t tag;
if (avio_rl32(pb) != TAG_SIFF)
return -1;
avio_skip(pb, 4); //ignore size
tag = avio_rl32(pb);
if (tag != TAG_VBV1 && tag != TAG_SOUN){
av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
return -1;
}
if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
return -1;
if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
return -1;
if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')){
av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
return -1;
}
avio_skip(pb, 4); //ignore size
return 0;
}
static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
{
SIFFContext *c = s->priv_data;
int size;
if (c->has_video){
if (c->cur_frame >= c->frames)
return AVERROR(EIO);
if (c->curstrm == -1){
c->pktsize = avio_rl32(s->pb) - 4;
c->flags = avio_rl16(s->pb);
c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
if (c->gmcsize)
avio_read(s->pb, c->gmc, c->gmcsize);
c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb): 0;
c->curstrm = !!(c->flags & VB_HAS_AUDIO);
}
if (!c->curstrm){
size = c->pktsize - c->sndsize;
if (av_new_packet(pkt, size) < 0)
return AVERROR(ENOMEM);
AV_WL16(pkt->data, c->flags);
if (c->gmcsize)
memcpy(pkt->data + 2, c->gmc, c->gmcsize);
avio_read(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
pkt->stream_index = 0;
c->curstrm = -1;
}else{
if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
return AVERROR(EIO);
pkt->stream_index = 1;
c->curstrm = 0;
}
if(!c->cur_frame || c->curstrm)
pkt->flags |= AV_PKT_FLAG_KEY;
if (c->curstrm == -1)
c->cur_frame++;
}else{
size = av_get_packet(s->pb, pkt, c->block_align);
if(size <= 0)
return AVERROR(EIO);
}
return pkt->size;
}
AVInputFormat ff_siff_demuxer = {
.name = "siff",
.long_name = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
.priv_data_size = sizeof(SIFFContext),
.read_probe = siff_probe,
.read_header = siff_read_header,
.read_packet = siff_read_packet,
.extensions = "vb,son"
};
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