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 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 /**
  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 #include "avio_internal.h"
  34
  35 #define RoQ_MAGIC_NUMBER 0x1084
  36 #define RoQ_CHUNK_PREAMBLE_SIZE 8
  37 #define RoQ_AUDIO_SAMPLE_RATE 22050
  38 #define RoQ_CHUNKS_TO_SCAN 30
  39
  40 #define RoQ_INFO           0x1001
  41 #define RoQ_QUAD_CODEBOOK  0x1002
  42 #define RoQ_QUAD_VQ        0x1011
  43 #define RoQ_SOUND_MONO     0x1020
  44 #define RoQ_SOUND_STEREO   0x1021
  45
  46 typedef struct RoqDemuxContext {
  47
  48     int frame_rate;
  49     int width;
  50     int height;
  51     int audio_channels;
  52
  53     int video_stream_index;
  54     int audio_stream_index;
  55
  56     int64_t video_pts;
  57     unsigned int audio_frame_count;
  58
  59 } RoqDemuxContext;
  60
  61 static int roq_probe(AVProbeData *p)
  62 {
  63     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
  64         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
  65         return 0;
  66
  67     return AVPROBE_SCORE_MAX;
  68 }
  69
  70 static int roq_read_header(AVFormatContext *s,
  71                            AVFormatParameters *ap)
  72 {
  73     RoqDemuxContext *roq = s->priv_data;
  74     AVIOContext *pb = s->pb;
  75     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
  76
  77     /* get the main header */
  78     if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
  79         RoQ_CHUNK_PREAMBLE_SIZE)
  80         return AVERROR(EIO);
  81     roq->frame_rate = AV_RL16(&preamble[6]);
  82
  83     /* init private context parameters */
  84     roq->width = roq->height = roq->audio_channels = roq->video_pts =
  85     roq->audio_frame_count = 0;
  86     roq->audio_stream_index = -1;
  87     roq->video_stream_index = -1;
  88
  89     s->ctx_flags |= AVFMTCTX_NOHEADER;
  90
  91     return 0;
  92 }
  93
  94 static int roq_read_packet(AVFormatContext *s,
  95                            AVPacket *pkt)
  96 {
  97     RoqDemuxContext *roq = s->priv_data;
  98     AVIOContext *pb = s->pb;
  99     int ret = 0;
 100     unsigned int chunk_size;
 101     unsigned int chunk_type;
 102     unsigned int codebook_size;
 103     unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
 104     int packet_read = 0;
 105     int64_t codebook_offset;
 106
 107     while (!packet_read) {
 108
 109         if (url_feof(s->pb))
 110             return AVERROR(EIO);
 111
 112         /* get the next chunk preamble */
 113         if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
 114             RoQ_CHUNK_PREAMBLE_SIZE)
 115             return AVERROR(EIO);
 116
 117         chunk_type = AV_RL16(&preamble[0]);
 118         chunk_size = AV_RL32(&preamble[2]);
 119         if(chunk_size > INT_MAX)
 120             return AVERROR_INVALIDDATA;
 121
 122         chunk_size = ffio_limit(pb, chunk_size);
 123
 124         switch (chunk_type) {
 125
 126         case RoQ_INFO:
 127             if (roq->video_stream_index == -1) {
 128                 AVStream *st = avformat_new_stream(s, NULL);
 129                 if (!st)
 130                     return AVERROR(ENOMEM);
 131                 avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
 132                 roq->video_stream_index = st->index;
 133                 st->codec->codec_type   = AVMEDIA_TYPE_VIDEO;
 134                 st->codec->codec_id     = CODEC_ID_ROQ;
 135                 st->codec->codec_tag    = 0;  /* no fourcc */
 136
 137                 if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
 138                     return AVERROR(EIO);
 139                 st->codec->width  = roq->width  = AV_RL16(preamble);
 140                 st->codec->height = roq->height = AV_RL16(preamble + 2);
 141                 break;
 142             }
 143             /* don't care about this chunk anymore */
 144             avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
 145             break;
 146
 147         case RoQ_QUAD_CODEBOOK:
 148             /* packet needs to contain both this codebook and next VQ chunk */
 149             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
 150             codebook_size = chunk_size;
 151             avio_skip(pb, codebook_size);
 152             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
 153                 RoQ_CHUNK_PREAMBLE_SIZE)
 154                 return AVERROR(EIO);
 155             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
 156                 codebook_size;
 157
 158             /* rewind */
 159             avio_seek(pb, codebook_offset, SEEK_SET);
 160
 161             /* load up the packet */
 162             ret= av_get_packet(pb, pkt, chunk_size);
 163             if (ret != chunk_size)
 164                 return AVERROR(EIO);
 165             pkt->stream_index = roq->video_stream_index;
 166             pkt->pts = roq->video_pts++;
 167
 168             packet_read = 1;
 169             break;
 170
 171         case RoQ_SOUND_MONO:
 172         case RoQ_SOUND_STEREO:
 173             if (roq->audio_stream_index == -1) {
 174                 AVStream *st = avformat_new_stream(s, NULL);
 175                 if (!st)
 176                     return AVERROR(ENOMEM);
 177                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
 178                 roq->audio_stream_index = st->index;
 179                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 180                 st->codec->codec_id = CODEC_ID_ROQ_DPCM;
 181                 st->codec->codec_tag = 0;  /* no tag */
 182                 st->codec->channels = roq->audio_channels = chunk_type == RoQ_SOUND_STEREO ? 2 : 1;
 183                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
 184                 st->codec->bits_per_coded_sample = 16;
 185                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
 186                     st->codec->bits_per_coded_sample;
 187                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 188             }
 189         case RoQ_QUAD_VQ:
 190             /* load up the packet */
 191             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
 192                 return AVERROR(EIO);
 193             /* copy over preamble */
 194             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
 195
 196             if (chunk_type == RoQ_QUAD_VQ) {
 197                 pkt->stream_index = roq->video_stream_index;
 198                 pkt->pts = roq->video_pts++;
 199             } else {
 200                 pkt->stream_index = roq->audio_stream_index;
 201                 pkt->pts = roq->audio_frame_count;
 202                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
 203             }
 204
 205             pkt->pos= avio_tell(pb);
 206             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
 207                 chunk_size);
 208             if (ret != chunk_size)
 209                 ret = AVERROR(EIO);
 210
 211             packet_read = 1;
 212             break;
 213
 214         default:
 215             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
 216             return AVERROR_INVALIDDATA;
 217         }
 218     }
 219
 220     return ret;
 221 }
 222
 223 AVInputFormat ff_roq_demuxer = {
 224     .name           = "RoQ",
 225     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ format"),
 226     .priv_data_size = sizeof(RoqDemuxContext),
 227     .read_probe     = roq_probe,
 228     .read_header    = roq_read_header,
 229     .read_packet    = roq_read_packet,
 230 };