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/*
* THP Demuxer
* Copyright (c) 2007 Marco Gerards
*
* 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 "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;
AVIOContext *pb = s->pb;
int i;
/* Read the file header. */
avio_rb32(pb); /* Skip Magic. */
thp->version = avio_rb32(pb);
avio_rb32(pb); /* Max buf size. */
avio_rb32(pb); /* Max samples. */
thp->fps = av_d2q(av_int2flt(avio_rb32(pb)), INT_MAX);
thp->framecnt = avio_rb32(pb);
thp->first_framesz = avio_rb32(pb);
avio_rb32(pb); /* Data size. */
thp->compoff = avio_rb32(pb);
avio_rb32(pb); /* offsetDataOffset. */
thp->first_frame = avio_rb32(pb);
thp->last_frame = avio_rb32(pb);
thp->next_framesz = thp->first_framesz;
thp->next_frame = thp->first_frame;
/* Read the component structure. */
avio_seek (pb, thp->compoff, SEEK_SET);
thp->compcount = avio_rb32(pb);
/* Read the list of component types. */
avio_read(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 = avio_rb32(pb);
st->codec->height = avio_rb32(pb);
st->codec->sample_rate = av_q2d(thp->fps);
thp->vst = st;
thp->video_stream_index = st->index;
if (thp->version == 0x11000)
avio_rb32(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 = avio_rb32(pb); /* numChannels. */
st->codec->sample_rate = avio_rb32(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;
AVIOContext *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);
avio_seek(pb, thp->next_frame, SEEK_SET);
/* Locate the next frame and read out its size. */
thp->next_frame += thp->next_framesz;
thp->next_framesz = avio_rb32(pb);
avio_rb32(pb); /* Previous total size. */
size = avio_rb32(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 = avio_rb32(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 ff_thp_demuxer = {
"thp",
NULL_IF_CONFIG_SMALL("THP"),
sizeof(ThpDemuxContext),
thp_probe,
thp_read_header,
thp_read_packet
};
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