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/*
* THP Demuxer |
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* Copyright (c) 2007 Marco Gerards |
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*
* 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
*/
|
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/intfloat.h" |
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#include "avformat.h" |
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#include "internal.h" |
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typedef struct ThpDemuxContext {
int version; |
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unsigned first_frame;
unsigned first_framesz;
unsigned last_frame; |
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int compoff; |
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unsigned framecnt; |
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AVRational fps; |
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unsigned frame;
int64_t next_frame;
unsigned next_framesz; |
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int video_stream_index; |
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int audio_stream_index; |
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int compcount;
unsigned char components[16];
AVStream* vst;
int has_audio; |
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unsigned audiosize; |
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} ThpDemuxContext;
static int thp_probe(AVProbeData *p)
{ |
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double d; |
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/* check file header */ |
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if (AV_RL32(p->buf) != MKTAG('T', 'H', 'P', '\0')) |
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return 0; |
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d = av_int2float(AV_RB32(p->buf + 16));
if (d < 0.1 || d > 1000 || isnan(d))
return AVPROBE_SCORE_MAX/4;
return AVPROBE_SCORE_MAX; |
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}
|
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static int thp_read_header(AVFormatContext *s) |
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{ |
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ThpDemuxContext *thp = s->priv_data;
AVStream *st; |
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AVIOContext *pb = s->pb; |
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int64_t fsize= avio_size(pb); |
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int i;
/* Read the file header. */ |
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avio_rb32(pb); /* Skip Magic. */
thp->version = avio_rb32(pb); |
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|
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avio_rb32(pb); /* Max buf size. */
avio_rb32(pb); /* Max samples. */ |
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|
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thp->fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX); |
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thp->framecnt = avio_rb32(pb);
thp->first_framesz = avio_rb32(pb); |
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pb->maxsize = avio_rb32(pb);
if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
pb->maxsize= fsize; |
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|
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thp->compoff = avio_rb32(pb);
avio_rb32(pb); /* offsetDataOffset. */
thp->first_frame = avio_rb32(pb);
thp->last_frame = avio_rb32(pb); |
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thp->next_framesz = thp->first_framesz;
thp->next_frame = thp->first_frame;
/* Read the component structure. */ |
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avio_seek (pb, thp->compoff, SEEK_SET); |
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thp->compcount = avio_rb32(pb); |
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/* Read the list of component types. */ |
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avio_read(pb, thp->components, 16); |
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for (i = 0; i < thp->compcount; i++) {
if (thp->components[i] == 0) { |
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if (thp->vst) |
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break;
/* Video component. */ |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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/* The denominator and numerator are switched because 1/fps
is required. */ |
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avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num); |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = AV_CODEC_ID_THP; |
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st->codec->codec_tag = 0; /* no fourcc */ |
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st->codec->width = avio_rb32(pb);
st->codec->height = avio_rb32(pb); |
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st->nb_frames =
st->duration = thp->framecnt; |
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thp->vst = st;
thp->video_stream_index = st->index;
if (thp->version == 0x11000) |
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avio_rb32(pb); /* Unknown. */ |
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} else if (thp->components[i] == 1) {
if (thp->has_audio != 0)
break;
/* Audio component. */ |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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|
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = AV_CODEC_ID_ADPCM_THP; |
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st->codec->codec_tag = 0; /* no fourcc */ |
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st->codec->channels = avio_rb32(pb); /* numChannels. */
st->codec->sample_rate = avio_rb32(pb); /* Frequency. */ |
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st->duration = avio_rb32(pb); |
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|
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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thp->audio_stream_index = st->index;
thp->has_audio = 1; |
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}
}
|
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return 0; |
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}
static int thp_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
ThpDemuxContext *thp = s->priv_data; |
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AVIOContext *pb = s->pb; |
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unsigned int size; |
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int ret;
|
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if (thp->audiosize == 0) { |
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/* Terminate when last frame is reached. */
if (thp->frame >= thp->framecnt) |
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return AVERROR_EOF; |
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|
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avio_seek(pb, thp->next_frame, SEEK_SET); |
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|
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/* Locate the next frame and read out its size. */ |
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thp->next_frame += FFMAX(thp->next_framesz, 1); |
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thp->next_framesz = avio_rb32(pb); |
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|
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avio_rb32(pb); /* Previous total size. */
size = avio_rb32(pb); /* Total size of this frame. */ |
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|
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/* Store the audiosize so the next time this function is called,
the audio can be read. */
if (thp->has_audio) |
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thp->audiosize = avio_rb32(pb); /* Audio size. */ |
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else
thp->frame++; |
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|
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ret = av_get_packet(pb, pkt, size); |
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if (ret < 0)
return ret; |
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if (ret != size) { |
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av_packet_unref(pkt); |
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return AVERROR(EIO); |
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} |
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|
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pkt->stream_index = thp->video_stream_index;
} else { |
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ret = av_get_packet(pb, pkt, thp->audiosize); |
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if (ret < 0)
return ret; |
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if (ret != thp->audiosize) { |
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av_packet_unref(pkt); |
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return AVERROR(EIO); |
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}
pkt->stream_index = thp->audio_stream_index; |
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if (thp->audiosize >= 8)
pkt->duration = AV_RB32(&pkt->data[4]);
|
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thp->audiosize = 0;
thp->frame++;
} |
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return 0;
}
|
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AVInputFormat ff_thp_demuxer = { |
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.name = "thp",
.long_name = NULL_IF_CONFIG_SMALL("THP"),
.priv_data_size = sizeof(ThpDemuxContext),
.read_probe = thp_probe,
.read_header = thp_read_header,
.read_packet = thp_read_packet |
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}; |