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