libavformat/thp.c

   1 /*
   2  * THP Demuxer
   3  * Copyright (c) 2007 Marco Gerards
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/intreadwrite.h"
  23 #include "libavutil/intfloat.h"
  24 #include "avformat.h"
  25 #include "internal.h"
  26
  27 typedef struct ThpDemuxContext {
  28     int              version;
  29     int              first_frame;
  30     int              first_framesz;
  31     int              last_frame;
  32     int              compoff;
  33     int              framecnt;
  34     AVRational       fps;
  35     int              frame;
  36     int              next_frame;
  37     int              next_framesz;
  38     int              video_stream_index;
  39     int              audio_stream_index;
  40     int              compcount;
  41     unsigned char    components[16];
  42     AVStream*        vst;
  43     int              has_audio;
  44     int              audiosize;
  45 } ThpDemuxContext;
  46
  47
  48 static int thp_probe(AVProbeData *p)
  49 {
  50     /* check file header */
  51     if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0'))
  52         return AVPROBE_SCORE_MAX;
  53     else
  54         return 0;
  55 }
  56
  57 static int thp_read_header(AVFormatContext *s)
  58 {
  59     ThpDemuxContext *thp = s->priv_data;
  60     AVStream *st;
  61     AVIOContext *pb = s->pb;
  62     int i;
  63
  64     /* Read the file header.  */
  65                            avio_rb32(pb); /* Skip Magic.  */
  66     thp->version         = avio_rb32(pb);
  67
  68                            avio_rb32(pb); /* Max buf size.  */
  69                            avio_rb32(pb); /* Max samples.  */
  70
  71     thp->fps             = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
  72     thp->framecnt        = avio_rb32(pb);
  73     thp->first_framesz   = avio_rb32(pb);
  74                            avio_rb32(pb); /* Data size.  */
  75
  76     thp->compoff         = avio_rb32(pb);
  77                            avio_rb32(pb); /* offsetDataOffset.  */
  78     thp->first_frame     = avio_rb32(pb);
  79     thp->last_frame      = avio_rb32(pb);
  80
  81     thp->next_framesz    = thp->first_framesz;
  82     thp->next_frame      = thp->first_frame;
  83
  84     /* Read the component structure.  */
  85     avio_seek (pb, thp->compoff, SEEK_SET);
  86     thp->compcount       = avio_rb32(pb);
  87
  88     /* Read the list of component types.  */
  89     avio_read(pb, thp->components, 16);
  90
  91     for (i = 0; i < thp->compcount; i++) {
  92         if (thp->components[i] == 0) {
  93             if (thp->vst != 0)
  94                 break;
  95
  96             /* Video component.  */
  97             st = avformat_new_stream(s, NULL);
  98             if (!st)
  99                 return AVERROR(ENOMEM);
 100
 101             /* The denominator and numerator are switched because 1/fps
 102                is required.  */
 103             avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
 104             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 105             st->codec->codec_id = AV_CODEC_ID_THP;
 106             st->codec->codec_tag = 0;  /* no fourcc */
 107             st->codec->width = avio_rb32(pb);
 108             st->codec->height = avio_rb32(pb);
 109             st->codec->sample_rate = av_q2d(thp->fps);
 110             thp->vst = st;
 111             thp->video_stream_index = st->index;
 112
 113             if (thp->version == 0x11000)
 114                 avio_rb32(pb); /* Unknown.  */
 115         } else if (thp->components[i] == 1) {
 116             if (thp->has_audio != 0)
 117                 break;
 118
 119             /* Audio component.  */
 120             st = avformat_new_stream(s, NULL);
 121             if (!st)
 122                 return AVERROR(ENOMEM);
 123
 124             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 125             st->codec->codec_id = AV_CODEC_ID_ADPCM_THP;
 126             st->codec->codec_tag = 0;  /* no fourcc */
 127             st->codec->channels    = avio_rb32(pb); /* numChannels.  */
 128             st->codec->sample_rate = avio_rb32(pb); /* Frequency.  */
 129
 130             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
 131
 132             thp->audio_stream_index = st->index;
 133             thp->has_audio = 1;
 134         }
 135     }
 136
 137     return 0;
 138 }
 139
 140 static int thp_read_packet(AVFormatContext *s,
 141                             AVPacket *pkt)
 142 {
 143     ThpDemuxContext *thp = s->priv_data;
 144     AVIOContext *pb = s->pb;
 145     int size;
 146     int ret;
 147
 148     if (thp->audiosize == 0) {
 149         /* Terminate when last frame is reached.  */
 150         if (thp->frame >= thp->framecnt)
 151             return AVERROR(EIO);
 152
 153         avio_seek(pb, thp->next_frame, SEEK_SET);
 154
 155         /* Locate the next frame and read out its size.  */
 156         thp->next_frame += thp->next_framesz;
 157         thp->next_framesz = avio_rb32(pb);
 158
 159                         avio_rb32(pb); /* Previous total size.  */
 160         size          = avio_rb32(pb); /* Total size of this frame.  */
 161
 162         /* Store the audiosize so the next time this function is called,
 163            the audio can be read.  */
 164         if (thp->has_audio)
 165             thp->audiosize = avio_rb32(pb); /* Audio size.  */
 166         else
 167             thp->frame++;
 168
 169         ret = av_get_packet(pb, pkt, size);
 170         if (ret != size) {
 171             av_free_packet(pkt);
 172             return AVERROR(EIO);
 173         }
 174
 175         pkt->stream_index = thp->video_stream_index;
 176     } else {
 177         ret = av_get_packet(pb, pkt, thp->audiosize);
 178         if (ret != thp->audiosize) {
 179             av_free_packet(pkt);
 180             return AVERROR(EIO);
 181         }
 182
 183         pkt->stream_index = thp->audio_stream_index;
 184         if (thp->audiosize >= 8)
 185             pkt->duration = AV_RB32(&pkt->data[4]);
 186
 187         thp->audiosize = 0;
 188         thp->frame++;
 189     }
 190
 191     return 0;
 192 }
 193
 194 AVInputFormat ff_thp_demuxer = {
 195     .name           = "thp",
 196     .long_name      = NULL_IF_CONFIG_SMALL("THP"),
 197     .priv_data_size = sizeof(ThpDemuxContext),
 198     .read_probe     = thp_probe,
 199     .read_header    = thp_read_header,
 200     .read_packet    = thp_read_packet
 201 };