yading@11: /*
yading@11:  * THP Demuxer
yading@11:  * Copyright (c) 2007 Marco Gerards
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/intfloat.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: typedef struct ThpDemuxContext {
yading@11:     int              version;
yading@11:     int              first_frame;
yading@11:     int              first_framesz;
yading@11:     int              last_frame;
yading@11:     int              compoff;
yading@11:     int              framecnt;
yading@11:     AVRational       fps;
yading@11:     int              frame;
yading@11:     int              next_frame;
yading@11:     int              next_framesz;
yading@11:     int              video_stream_index;
yading@11:     int              audio_stream_index;
yading@11:     int              compcount;
yading@11:     unsigned char    components[16];
yading@11:     AVStream*        vst;
yading@11:     int              has_audio;
yading@11:     unsigned         audiosize;
yading@11: } ThpDemuxContext;
yading@11: 
yading@11: 
yading@11: static int thp_probe(AVProbeData *p)
yading@11: {
yading@11:     /* check file header */
yading@11:     if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0'))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     else
yading@11:         return 0;
yading@11: }
yading@11: 
yading@11: static int thp_read_header(AVFormatContext *s)
yading@11: {
yading@11:     ThpDemuxContext *thp = s->priv_data;
yading@11:     AVStream *st;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int64_t fsize= avio_size(pb);
yading@11:     int i;
yading@11: 
yading@11:     /* Read the file header.  */
yading@11:                            avio_rb32(pb); /* Skip Magic.  */
yading@11:     thp->version         = avio_rb32(pb);
yading@11: 
yading@11:                            avio_rb32(pb); /* Max buf size.  */
yading@11:                            avio_rb32(pb); /* Max samples.  */
yading@11: 
yading@11:     thp->fps             = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
yading@11:     thp->framecnt        = avio_rb32(pb);
yading@11:     thp->first_framesz   = avio_rb32(pb);
yading@11:     pb->maxsize          = avio_rb32(pb);
yading@11:     if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
yading@11:         pb->maxsize= fsize;
yading@11: 
yading@11:     thp->compoff         = avio_rb32(pb);
yading@11:                            avio_rb32(pb); /* offsetDataOffset.  */
yading@11:     thp->first_frame     = avio_rb32(pb);
yading@11:     thp->last_frame      = avio_rb32(pb);
yading@11: 
yading@11:     thp->next_framesz    = thp->first_framesz;
yading@11:     thp->next_frame      = thp->first_frame;
yading@11: 
yading@11:     /* Read the component structure.  */
yading@11:     avio_seek (pb, thp->compoff, SEEK_SET);
yading@11:     thp->compcount       = avio_rb32(pb);
yading@11: 
yading@11:     /* Read the list of component types.  */
yading@11:     avio_read(pb, thp->components, 16);
yading@11: 
yading@11:     for (i = 0; i < thp->compcount; i++) {
yading@11:         if (thp->components[i] == 0) {
yading@11:             if (thp->vst != 0)
yading@11:                 break;
yading@11: 
yading@11:             /* Video component.  */
yading@11:             st = avformat_new_stream(s, NULL);
yading@11:             if (!st)
yading@11:                 return AVERROR(ENOMEM);
yading@11: 
yading@11:             /* The denominator and numerator are switched because 1/fps
yading@11:                is required.  */
yading@11:             avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:             st->codec->codec_id = AV_CODEC_ID_THP;
yading@11:             st->codec->codec_tag = 0;  /* no fourcc */
yading@11:             st->codec->width = avio_rb32(pb);
yading@11:             st->codec->height = avio_rb32(pb);
yading@11:             st->codec->sample_rate = av_q2d(thp->fps);
yading@11:             st->nb_frames =
yading@11:             st->duration = thp->framecnt;
yading@11:             thp->vst = st;
yading@11:             thp->video_stream_index = st->index;
yading@11: 
yading@11:             if (thp->version == 0x11000)
yading@11:                 avio_rb32(pb); /* Unknown.  */
yading@11:         } else if (thp->components[i] == 1) {
yading@11:             if (thp->has_audio != 0)
yading@11:                 break;
yading@11: 
yading@11:             /* Audio component.  */
yading@11:             st = avformat_new_stream(s, NULL);
yading@11:             if (!st)
yading@11:                 return AVERROR(ENOMEM);
yading@11: 
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:             st->codec->codec_id = AV_CODEC_ID_ADPCM_THP;
yading@11:             st->codec->codec_tag = 0;  /* no fourcc */
yading@11:             st->codec->channels    = avio_rb32(pb); /* numChannels.  */
yading@11:             st->codec->sample_rate = avio_rb32(pb); /* Frequency.  */
yading@11: 
yading@11:             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11: 
yading@11:             thp->audio_stream_index = st->index;
yading@11:             thp->has_audio = 1;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int thp_read_packet(AVFormatContext *s,
yading@11:                             AVPacket *pkt)
yading@11: {
yading@11:     ThpDemuxContext *thp = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     unsigned int size;
yading@11:     int ret;
yading@11: 
yading@11:     if (thp->audiosize == 0) {
yading@11:         /* Terminate when last frame is reached.  */
yading@11:         if (thp->frame >= thp->framecnt)
yading@11:             return AVERROR_EOF;
yading@11: 
yading@11:         avio_seek(pb, thp->next_frame, SEEK_SET);
yading@11: 
yading@11:         /* Locate the next frame and read out its size.  */
yading@11:         thp->next_frame += thp->next_framesz;
yading@11:         thp->next_framesz = avio_rb32(pb);
yading@11: 
yading@11:                         avio_rb32(pb); /* Previous total size.  */
yading@11:         size          = avio_rb32(pb); /* Total size of this frame.  */
yading@11: 
yading@11:         /* Store the audiosize so the next time this function is called,
yading@11:            the audio can be read.  */
yading@11:         if (thp->has_audio)
yading@11:             thp->audiosize = avio_rb32(pb); /* Audio size.  */
yading@11:         else
yading@11:             thp->frame++;
yading@11: 
yading@11:         ret = av_get_packet(pb, pkt, size);
yading@11:         if (ret != size) {
yading@11:             av_free_packet(pkt);
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11: 
yading@11:         pkt->stream_index = thp->video_stream_index;
yading@11:     } else {
yading@11:         ret = av_get_packet(pb, pkt, thp->audiosize);
yading@11:         if (ret != thp->audiosize) {
yading@11:             av_free_packet(pkt);
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11: 
yading@11:         pkt->stream_index = thp->audio_stream_index;
yading@11:         if (thp->audiosize >= 8)
yading@11:             pkt->duration = AV_RB32(&pkt->data[4]);
yading@11: 
yading@11:         thp->audiosize = 0;
yading@11:         thp->frame++;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_thp_demuxer = {
yading@11:     .name           = "thp",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("THP"),
yading@11:     .priv_data_size = sizeof(ThpDemuxContext),
yading@11:     .read_probe     = thp_probe,
yading@11:     .read_header    = thp_read_header,
yading@11:     .read_packet    = thp_read_packet
yading@11: };