libavformat/thp.c

   1 /*
   2  * THP Demuxer
   3  * Copyright (c) 2007 Marco Gerards
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "avio_internal.h"
  26 #include "demux.h"
  27 #include "internal.h"
  28
  29 typedef struct ThpDemuxContext {
  30     int              version;
  31     unsigned         first_frame;
  32     unsigned         first_framesz;
  33     unsigned         last_frame;
  34     int              compoff;
  35     unsigned         framecnt;
  36     AVRational       fps;
  37     unsigned         frame;
  38     int64_t          next_frame;
  39     unsigned         next_framesz;
  40     int              video_stream_index;
  41     int              audio_stream_index;
  42     int              compcount;
  43     unsigned char    components[16];
  44     AVStream*        vst;
  45     int              has_audio;
  46     unsigned         audiosize;
  47 } ThpDemuxContext;
  48
  49
  50 static int thp_probe(const AVProbeData *p)
  51 {
  52     double d;
  53     /* check file header */
  54     if (AV_RL32(p->buf) != MKTAG('T', 'H', 'P', '\0'))
  55         return 0;
  56
  57     d = av_int2float(AV_RB32(p->buf + 16));
  58     if (d < 0.1 || d > 1000 || isnan(d))
  59         return AVPROBE_SCORE_MAX/4;
  60
  61     return AVPROBE_SCORE_MAX;
  62 }
  63
  64 static int thp_read_header(AVFormatContext *s)
  65 {
  66     ThpDemuxContext *thp = s->priv_data;
  67     AVStream *st;
  68     AVIOContext *pb = s->pb;
  69     int64_t fsize= avio_size(pb);
  70     uint32_t maxsize;
  71     int i;
  72
  73     /* Read the file header.  */
  74                            avio_rb32(pb); /* Skip Magic.  */
  75     thp->version         = avio_rb32(pb);
  76
  77                            avio_rb32(pb); /* Max buf size.  */
  78                            avio_rb32(pb); /* Max samples.  */
  79
  80     thp->fps             = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
  81     if (thp->fps.den <= 0 || thp->fps.num < 0)
  82         return AVERROR_INVALIDDATA;
  83     thp->framecnt        = avio_rb32(pb);
  84     thp->first_framesz   = avio_rb32(pb);
  85     maxsize              = avio_rb32(pb);
  86     if (fsize > 0 && (!maxsize || fsize < maxsize))
  87         maxsize = fsize;
  88     ffiocontext(pb)->maxsize = fsize;
  89
  90     thp->compoff         = avio_rb32(pb);
  91                            avio_rb32(pb); /* offsetDataOffset.  */
  92     thp->first_frame     = avio_rb32(pb);
  93     thp->last_frame      = avio_rb32(pb);
  94
  95     thp->next_framesz    = thp->first_framesz;
  96     thp->next_frame      = thp->first_frame;
  97
  98     /* Read the component structure.  */
  99     avio_seek (pb, thp->compoff, SEEK_SET);
 100     thp->compcount       = avio_rb32(pb);
 101
 102     if (thp->compcount > FF_ARRAY_ELEMS(thp->components))
 103         return AVERROR_INVALIDDATA;
 104
 105     /* Read the list of component types.  */
 106     avio_read(pb, thp->components, 16);
 107
 108     for (i = 0; i < thp->compcount; i++) {
 109         if (thp->components[i] == 0) {
 110             if (thp->vst)
 111                 break;
 112
 113             /* Video component.  */
 114             st = avformat_new_stream(s, NULL);
 115             if (!st)
 116                 return AVERROR(ENOMEM);
 117
 118             /* The denominator and numerator are switched because 1/fps
 119                is required.  */
 120             avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
 121             st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 122             st->codecpar->codec_id = AV_CODEC_ID_THP;
 123             st->codecpar->codec_tag = 0;  /* no fourcc */
 124             st->codecpar->width = avio_rb32(pb);
 125             st->codecpar->height = avio_rb32(pb);
 126             st->codecpar->sample_rate = av_q2d(thp->fps);
 127             st->nb_frames =
 128             st->duration = thp->framecnt;
 129             thp->vst = st;
 130             thp->video_stream_index = st->index;
 131
 132             if (thp->version == 0x11000)
 133                 avio_rb32(pb); /* Unknown.  */
 134         } else if (thp->components[i] == 1) {
 135             if (thp->has_audio != 0)
 136                 break;
 137
 138             /* Audio component.  */
 139             st = avformat_new_stream(s, NULL);
 140             if (!st)
 141                 return AVERROR(ENOMEM);
 142
 143             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 144             st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP;
 145             st->codecpar->codec_tag = 0;  /* no fourcc */
 146             st->codecpar->ch_layout.nb_channels = avio_rb32(pb);
 147             st->codecpar->sample_rate = avio_rb32(pb); /* Frequency.  */
 148             st->duration           = avio_rb32(pb);
 149
 150             avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 151
 152             thp->audio_stream_index = st->index;
 153             thp->has_audio = 1;
 154         }
 155     }
 156
 157     if (!thp->vst)
 158         return AVERROR_INVALIDDATA;
 159
 160     return 0;
 161 }
 162
 163 static int thp_read_packet(AVFormatContext *s,
 164                             AVPacket *pkt)
 165 {
 166     ThpDemuxContext *thp = s->priv_data;
 167     AVIOContext *pb = s->pb;
 168     unsigned int size;
 169     int ret;
 170
 171     if (thp->audiosize == 0) {
 172         /* Terminate when last frame is reached.  */
 173         if (thp->frame >= thp->framecnt)
 174             return AVERROR_EOF;
 175
 176         avio_seek(pb, thp->next_frame, SEEK_SET);
 177
 178         /* Locate the next frame and read out its size.  */
 179         thp->next_frame += FFMAX(thp->next_framesz, 1);
 180         thp->next_framesz = avio_rb32(pb);
 181
 182                         avio_rb32(pb); /* Previous total size.  */
 183         size          = avio_rb32(pb); /* Total size of this frame.  */
 184
 185         /* Store the audiosize so the next time this function is called,
 186            the audio can be read.  */
 187         if (thp->has_audio)
 188             thp->audiosize = avio_rb32(pb); /* Audio size.  */
 189         else
 190             thp->frame++;
 191
 192         ret = av_get_packet(pb, pkt, size);
 193         if (ret < 0)
 194             return ret;
 195         if (ret != size) {
 196             return AVERROR_INVALIDDATA;
 197         }
 198
 199         pkt->stream_index = thp->video_stream_index;
 200     } else {
 201         ret = av_get_packet(pb, pkt, thp->audiosize);
 202         if (ret < 0)
 203             return ret;
 204         if (ret != thp->audiosize) {
 205             return AVERROR_INVALIDDATA;
 206         }
 207
 208         pkt->stream_index = thp->audio_stream_index;
 209         if (thp->audiosize >= 8)
 210             pkt->duration = AV_RB32(&pkt->data[4]);
 211
 212         thp->audiosize = 0;
 213         thp->frame++;
 214     }
 215
 216     return 0;
 217 }
 218
 219 const FFInputFormat ff_thp_demuxer = {
 220     .p.name         = "thp",
 221     .p.long_name    = NULL_IF_CONFIG_SMALL("THP"),
 222     .priv_data_size = sizeof(ThpDemuxContext),
 223     .read_probe     = thp_probe,
 224     .read_header    = thp_read_header,
 225     .read_packet    = thp_read_packet
 226 };