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/channel_layout.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "avformat.h"
  33 #include "internal.h"
  34 #include "avio_internal.h"
  35
  36 #define RoQ_MAGIC_NUMBER 0x1084
  37 #define RoQ_CHUNK_PREAMBLE_SIZE 8
  38 #define RoQ_AUDIO_SAMPLE_RATE 22050
  39 #define RoQ_CHUNKS_TO_SCAN 30
  40
  41 #define RoQ_INFO           0x1001
  42 #define RoQ_QUAD_CODEBOOK  0x1002
  43 #define RoQ_QUAD_VQ        0x1011
  44 #define RoQ_SOUND_MONO     0x1020
  45 #define RoQ_SOUND_STEREO   0x1021
  46
  47 typedef struct RoqDemuxContext {
  48
  49     int frame_rate;
  50     int width;
  51     int height;
  52     int audio_channels;
  53
  54     int video_stream_index;
  55     int audio_stream_index;
  56
  57     int64_t video_pts;
  58     unsigned int audio_frame_count;
  59
  60 } RoqDemuxContext;
  61
  62 static int roq_probe(AVProbeData *p)
  63 {
  64     if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
  65         (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
  66         return 0;
  67
  68     return AVPROBE_SCORE_MAX;
  69 }
  70
  71 static int roq_read_header(AVFormatContext *s)
  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 (avio_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     = AV_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             if (roq->video_stream_index < 0)
 149                 return AVERROR_INVALIDDATA;
 150             /* packet needs to contain both this codebook and next VQ chunk */
 151             codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
 152             codebook_size = chunk_size;
 153             avio_skip(pb, codebook_size);
 154             if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
 155                 RoQ_CHUNK_PREAMBLE_SIZE)
 156                 return AVERROR(EIO);
 157             chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
 158                 codebook_size;
 159
 160             /* rewind */
 161             avio_seek(pb, codebook_offset, SEEK_SET);
 162
 163             /* load up the packet */
 164             ret= av_get_packet(pb, pkt, chunk_size);
 165             if (ret != chunk_size)
 166                 return AVERROR(EIO);
 167             pkt->stream_index = roq->video_stream_index;
 168             pkt->pts = roq->video_pts++;
 169
 170             packet_read = 1;
 171             break;
 172
 173         case RoQ_SOUND_MONO:
 174         case RoQ_SOUND_STEREO:
 175             if (roq->audio_stream_index == -1) {
 176                 AVStream *st = avformat_new_stream(s, NULL);
 177                 if (!st)
 178                     return AVERROR(ENOMEM);
 179                 avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
 180                 roq->audio_stream_index = st->index;
 181                 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
 182                 st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM;
 183                 st->codec->codec_tag = 0;  /* no tag */
 184                 if (chunk_type == RoQ_SOUND_STEREO) {
 185                     st->codec->channels       = 2;
 186                     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
 187                 } else {
 188                     st->codec->channels       = 1;
 189                     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
 190                 }
 191                 roq->audio_channels    = st->codec->channels;
 192                 st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
 193                 st->codec->bits_per_coded_sample = 16;
 194                 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
 195                     st->codec->bits_per_coded_sample;
 196                 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 197             }
 198         case RoQ_QUAD_VQ:
 199             if (chunk_type == RoQ_QUAD_VQ) {
 200                 if (roq->video_stream_index < 0)
 201                     return AVERROR_INVALIDDATA;
 202             }
 203
 204             /* load up the packet */
 205             if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
 206                 return AVERROR(EIO);
 207             /* copy over preamble */
 208             memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
 209
 210             if (chunk_type == RoQ_QUAD_VQ) {
 211                 pkt->stream_index = roq->video_stream_index;
 212                 pkt->pts = roq->video_pts++;
 213             } else {
 214                 pkt->stream_index = roq->audio_stream_index;
 215                 pkt->pts = roq->audio_frame_count;
 216                 roq->audio_frame_count += (chunk_size / roq->audio_channels);
 217             }
 218
 219             pkt->pos= avio_tell(pb);
 220             ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
 221                 chunk_size);
 222             if (ret != chunk_size)
 223                 ret = AVERROR(EIO);
 224
 225             packet_read = 1;
 226             break;
 227
 228         default:
 229             av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
 230             return AVERROR_INVALIDDATA;
 231         }
 232     }
 233
 234     return ret;
 235 }
 236
 237 AVInputFormat ff_roq_demuxer = {
 238     .name           = "roq",
 239     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ"),
 240     .priv_data_size = sizeof(RoqDemuxContext),
 241     .read_probe     = roq_probe,
 242     .read_header    = roq_read_header,
 243     .read_packet    = roq_read_packet,
 244 };