git.sesse.net Git - ffmpeg/blob - libavformat/idroqdec.c

   1 /*
   2  * id RoQ (.roq) File Demuxer
   3  * Copyright (c) 2003 The ffmpeg Project
   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 /**
  23  * @file
  24  * id RoQ format file demuxer
  25  * by Mike Melanson (melanson@pcisys.net)
  26  * for more information on the .roq file format, visit:
  27  *   http://www.csse.monash.edu.au/~timf/
  28  */
  29
  30 #include "libavutil/intreadwrite.h"
  31 #include "avformat.h"
  32 #include "internal.h"
  33
  34 #define RoQ_MAGIC_NUMBER 0x1084
  35 #define RoQ_CHUNK_PREAMBLE_SIZE 8
  36 #define RoQ_AUDIO_SAMPLE_RATE 22050
  37 #define RoQ_CHUNKS_TO_SCAN 30
  38
  39 #define RoQ_INFO           0x1001
  40 #define RoQ_QUAD_CODEBOOK  0x1002
  41 #define RoQ_QUAD_VQ        0x1011
  42 #define RoQ_SOUND_MONO     0x1020
  43 #define RoQ_SOUND_STEREO   0x1021
  44
  45 typedef struct RoqDemuxContext {
  46
  47     int frame_rate;
  48     int width;
  49     int height;
  50     int audio_channels;
  51
  52     int video_stream_index;
  53     int audio_stream_index;
  54
  55     int64_t video_pts;
  56     unsigned int audio_frame_count;
  57
  58 } RoqDemuxContext;
  59
  60 static int roq_probe(AVProbeData *p)
  61 {
  62     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
  63         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
  64         return 0;
  65
  66     return AVPROBE_SCORE_MAX;
  67 }
  68
  69 static int roq_read_header(AVFormatContext *s,
  70                            AVFormatParameters *ap)
  71 {
  72     RoqDemuxContext *roq = s->priv_data;
  73     AVIOContext *pb = s->pb;
  74     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
  75
  76     /* get the main header */
  77     if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
  78         RoQ_CHUNK_PREAMBLE_SIZE)
  79         return AVERROR(EIO);
  80     roq->frame_rate = AV_RL16(&preamble[6]);
  81
  82     /* init private context parameters */
  83     roq->width = roq->height = roq->audio_channels = roq->video_pts =
  84     roq->audio_frame_count = 0;
  85     roq->audio_stream_index = -1;
  86     roq->video_stream_index = -1;
  87
  88     s->ctx_flags |= AVFMTCTX_NOHEADER;
  89
  90     return 0;
  91 }
  92
  93 static int roq_read_packet(AVFormatContext *s,
  94                            AVPacket *pkt)
  95 {
  96     RoqDemuxContext *roq = s->priv_data;
  97     AVIOContext *pb = s->pb;
  98     int ret = 0;
  99     unsigned int chunk_size;
 100     unsigned int chunk_type;
 101     unsigned int codebook_size;
 102     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
 103     int packet_read = 0;
 104     int64_t codebook_offset;
 105
 106     while (!packet_read) {
 107
 108         if (s->pb->eof_reached)
 109             return AVERROR(EIO);
 110
 111         /* get the next chunk preamble */
 112         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
 113             RoQ_CHUNK_PREAMBLE_SIZE)
 114             return AVERROR(EIO);
 115
 116         chunk_type = AV_RL16(&preamble[0]);
 117         chunk_size = AV_RL32(&preamble[2]);
 118         if(chunk_size > INT_MAX)
 119             return AVERROR_INVALIDDATA;
 120
 121         switch (chunk_type) {
 122
 123         case RoQ_INFO:
 124             if (roq->video_stream_index == -1) {
 125                 AVStream *st = avformat_new_stream(s, NULL);
 126                 if (!st)
 127                     return AVERROR(ENOMEM);
 128                 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
 129                 roq->video_stream_index = st->index;
 130                 st->codec->codec_type   = AVMEDIA_TYPE_VIDEO;
 131                 st->codec->codec_id     = CODEC_ID_ROQ;
 132                 st->codec->codec_tag    = 0;  /* no fourcc */
 133
 134                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
 135                     return AVERROR(EIO);
 136                 st->codec->width  = roq->width  = AV_RL16(preamble);
 137                 st->codec->height = roq->height = AV_RL16(preamble + 2);
 138                 break;
 139             }
 140             /* don't care about this chunk anymore */
 141             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
 142             break;
 143
 144         case RoQ_QUAD_CODEBOOK:
 145             /* packet needs to contain both this codebook and next VQ chunk */
 146             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
 147             codebook_size = chunk_size;
 148             avio_skip(pb, codebook_size);
 149             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
 150                 RoQ_CHUNK_PREAMBLE_SIZE)
 151                 return AVERROR(EIO);
 152             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
 153                 codebook_size;
 154
 155             /* rewind */
 156             avio_seek(pb, codebook_offset, SEEK_SET);
 157
 158             /* load up the packet */
 159             ret= av_get_packet(pb, pkt, chunk_size);
 160             if (ret != chunk_size)
 161                 return AVERROR(EIO);
 162             pkt->stream_index = roq->video_stream_index;
 163             pkt->pts = roq->video_pts++;
 164
 165             packet_read = 1;
 166             break;
 167
 168         case RoQ_SOUND_MONO:
 169         case RoQ_SOUND_STEREO:
 170             if (roq->audio_stream_index == -1) {
 171                 AVStream *st = avformat_new_stream(s, NULL);
 172                 if (!st)
 173                     return AVERROR(ENOMEM);
 174                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
 175                 roq->audio_stream_index = st->index;
 176                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 177                 st->codec->codec_id = CODEC_ID_ROQ_DPCM;
 178                 st->codec->codec_tag = 0;  /* no tag */
 179                 st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
 180                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
 181                 st->codec->bits_per_coded_sample = 16;
 182                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
 183                     st->codec->bits_per_coded_sample;
 184                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 185             }
 186         case RoQ_QUAD_VQ:
 187             /* load up the packet */
 188             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
 189                 return AVERROR(EIO);
 190             /* copy over preamble */
 191             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
 192
 193             if (chunk_type == RoQ_QUAD_VQ) {
 194                 pkt->stream_index = roq->video_stream_index;
 195                 pkt->pts = roq->video_pts++;
 196             } else {
 197                 pkt->stream_index = roq->audio_stream_index;
 198                 pkt->pts = roq->audio_frame_count;
 199                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
 200             }
 201
 202             pkt->pos= avio_tell(pb);
 203             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
 204                 chunk_size);
 205             if (ret != chunk_size)
 206                 ret = AVERROR(EIO);
 207
 208             packet_read = 1;
 209             break;
 210
 211         default:
 212             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
 213             return AVERROR_INVALIDDATA;
 214         }
 215     }
 216
 217     return ret;
 218 }
 219
 220 AVInputFormat ff_roq_demuxer = {
 221     .name           = "RoQ",
 222     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ format"),
 223     .priv_data_size = sizeof(RoqDemuxContext),
 224     .read_probe     = roq_probe,
 225     .read_header    = roq_read_header,
 226     .read_packet    = roq_read_packet,
 227 };