FFmpeg/libavformat/thp.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

198 lines
5.9 KiB
C

/*
* THP Demuxer
* Copyright (c) 2007 Marco Gerards
*
* 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"
typedef struct ThpDemuxContext {
int version;
int first_frame;
int first_framesz;
int last_frame;
int compoff;
int framecnt;
AVRational fps;
int frame;
int next_frame;
int next_framesz;
int video_stream_index;
int audio_stream_index;
int compcount;
unsigned char components[16];
AVStream* vst;
int has_audio;
int audiosize;
} ThpDemuxContext;
static int thp_probe(AVProbeData *p)
{
/* check file header */
if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0'))
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int thp_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
ThpDemuxContext *thp = s->priv_data;
AVStream *st;
ByteIOContext *pb = s->pb;
int i;
/* Read the file header. */
get_be32(pb); /* Skip Magic. */
thp->version = get_be32(pb);
get_be32(pb); /* Max buf size. */
get_be32(pb); /* Max samples. */
thp->fps = av_d2q(av_int2flt(get_be32(pb)), INT_MAX);
thp->framecnt = get_be32(pb);
thp->first_framesz = get_be32(pb);
get_be32(pb); /* Data size. */
thp->compoff = get_be32(pb);
get_be32(pb); /* offsetDataOffset. */
thp->first_frame = get_be32(pb);
thp->last_frame = get_be32(pb);
thp->next_framesz = thp->first_framesz;
thp->next_frame = thp->first_frame;
/* Read the component structure. */
url_fseek (pb, thp->compoff, SEEK_SET);
thp->compcount = get_be32(pb);
/* Read the list of component types. */
get_buffer(pb, thp->components, 16);
for (i = 0; i < thp->compcount; i++) {
if (thp->components[i] == 0) {
if (thp->vst != 0)
break;
/* Video component. */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
/* The denominator and numerator are switched because 1/fps
is required. */
av_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_THP;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = get_be32(pb);
st->codec->height = get_be32(pb);
st->codec->sample_rate = av_q2d(thp->fps);
thp->vst = st;
thp->video_stream_index = st->index;
if (thp->version == 0x11000)
get_be32(pb); /* Unknown. */
} else if (thp->components[i] == 1) {
if (thp->has_audio != 0)
break;
/* Audio component. */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_ADPCM_THP;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->channels = get_be32(pb); /* numChannels. */
st->codec->sample_rate = get_be32(pb); /* Frequency. */
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
thp->audio_stream_index = st->index;
thp->has_audio = 1;
}
}
return 0;
}
static int thp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
ThpDemuxContext *thp = s->priv_data;
ByteIOContext *pb = s->pb;
int size;
int ret;
if (thp->audiosize == 0) {
/* Terminate when last frame is reached. */
if (thp->frame >= thp->framecnt)
return AVERROR(EIO);
url_fseek(pb, thp->next_frame, SEEK_SET);
/* Locate the next frame and read out its size. */
thp->next_frame += thp->next_framesz;
thp->next_framesz = get_be32(pb);
get_be32(pb); /* Previous total size. */
size = get_be32(pb); /* Total size of this frame. */
/* Store the audiosize so the next time this function is called,
the audio can be read. */
if (thp->has_audio)
thp->audiosize = get_be32(pb); /* Audio size. */
else
thp->frame++;
ret = av_get_packet(pb, pkt, size);
if (ret != size) {
av_free_packet(pkt);
return AVERROR(EIO);
}
pkt->stream_index = thp->video_stream_index;
} else {
ret = av_get_packet(pb, pkt, thp->audiosize);
if (ret != thp->audiosize) {
av_free_packet(pkt);
return AVERROR(EIO);
}
pkt->stream_index = thp->audio_stream_index;
thp->audiosize = 0;
thp->frame++;
}
return 0;
}
AVInputFormat thp_demuxer = {
"thp",
NULL_IF_CONFIG_SMALL("THP"),
sizeof(ThpDemuxContext),
thp_probe,
thp_read_header,
thp_read_packet
};