libavformat/sierravmd.c

   1 /*
   2  * Sierra VMD Format Demuxer
   3  * Copyright (c) 2004 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  * Sierra VMD file demuxer
  25  * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
  26  * for more information on the Sierra VMD file format, visit:
  27  *   http://www.pcisys.net/~melanson/codecs/
  28  */
  29
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/intreadwrite.h"
  32 #include "libavutil/mem.h"
  33 #include "avformat.h"
  34 #include "avio_internal.h"
  35 #include "demux.h"
  36 #include "internal.h"
  37 #include "avio_internal.h"
  38
  39 #define VMD_HEADER_SIZE 0x0330
  40 #define BYTES_PER_FRAME_RECORD 16
  41
  42 typedef struct vmd_frame {
  43   int stream_index;
  44   unsigned int frame_size;
  45   int64_t frame_offset;
  46   int64_t pts;
  47   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
  48 } vmd_frame;
  49
  50 typedef struct VmdDemuxContext {
  51     int video_stream_index;
  52     int audio_stream_index;
  53
  54     unsigned int frame_count;
  55     unsigned int frames_per_block;
  56     vmd_frame *frame_table;
  57     unsigned int current_frame;
  58     int is_indeo3;
  59
  60     int sample_rate;
  61     int64_t audio_sample_counter;
  62     int skiphdr;
  63
  64     unsigned char vmd_header[VMD_HEADER_SIZE];
  65 } VmdDemuxContext;
  66
  67 static int vmd_probe(const AVProbeData *p)
  68 {
  69     int w, h, sample_rate;
  70     if (p->buf_size < 806)
  71         return 0;
  72     /* check if the first 2 bytes of the file contain the appropriate size
  73      * of a VMD header chunk */
  74     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
  75         return 0;
  76     w = AV_RL16(&p->buf[12]);
  77     h = AV_RL16(&p->buf[14]);
  78     sample_rate = AV_RL16(&p->buf[804]);
  79     if ((!w || w > 2048 || !h || h > 2048) &&
  80         sample_rate != 22050)
  81         return 0;
  82
  83     /* only return half certainty since this check is a bit sketchy */
  84     return AVPROBE_SCORE_EXTENSION;
  85 }
  86
  87 static int vmd_read_header(AVFormatContext *s)
  88 {
  89     VmdDemuxContext *vmd = s->priv_data;
  90     AVIOContext *pb = s->pb;
  91     AVStream *st = NULL, *vst = NULL;
  92     unsigned int toc_offset;
  93     unsigned char *raw_frame_table;
  94     int raw_frame_table_size;
  95     int64_t current_offset;
  96     int i, j, ret;
  97     int width, height;
  98     unsigned int total_frames;
  99     int64_t current_audio_pts = 0;
 100     unsigned char chunk[BYTES_PER_FRAME_RECORD];
 101     int num, den;
 102     int sound_buffers;
 103
 104     /* fetch the main header, including the 2 header length bytes */
 105     avio_seek(pb, 0, SEEK_SET);
 106     if ((ret = ffio_read_size(pb, vmd->vmd_header, VMD_HEADER_SIZE) < 0))
 107         return ret;
 108
 109     width = AV_RL16(&vmd->vmd_header[12]);
 110     height = AV_RL16(&vmd->vmd_header[14]);
 111     if (width && height) {
 112         if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
 113             vmd->is_indeo3 = 1;
 114         } else {
 115             vmd->is_indeo3 = 0;
 116         }
 117         /* start up the decoders */
 118         vst = avformat_new_stream(s, NULL);
 119         if (!vst)
 120             return AVERROR(ENOMEM);
 121         avpriv_set_pts_info(vst, 33, 1, 10);
 122         vmd->video_stream_index = vst->index;
 123         vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
 124         vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
 125         vst->codecpar->codec_tag = 0;  /* no fourcc */
 126         vst->codecpar->width = width;
 127         vst->codecpar->height = height;
 128         if(vmd->is_indeo3 && vst->codecpar->width > 320){
 129             vst->codecpar->width >>= 1;
 130             vst->codecpar->height >>= 1;
 131         }
 132         if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
 133             return ret;
 134         memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
 135     }
 136
 137     /* if sample rate is 0, assume no audio */
 138     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
 139     if (vmd->sample_rate) {
 140         int channels;
 141         st = avformat_new_stream(s, NULL);
 142         if (!st)
 143             return AVERROR(ENOMEM);
 144         vmd->audio_stream_index = st->index;
 145         st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
 146         st->codecpar->codec_id   = AV_CODEC_ID_VMDAUDIO;
 147         st->codecpar->codec_tag  = 0;  /* no fourcc */
 148         st->codecpar->sample_rate = vmd->sample_rate;
 149         st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
 150         if (st->codecpar->block_align & 0x8000) {
 151             st->codecpar->bits_per_coded_sample = 16;
 152             st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
 153         } else {
 154             st->codecpar->bits_per_coded_sample = 8;
 155         }
 156         if (vmd->vmd_header[811] & 0x80) {
 157             channels = 2;
 158         } else if (vmd->vmd_header[811] & 0x2) {
 159             /* Shivers 2 stereo audio */
 160             /* Frame length is for 1 channel */
 161             channels        = 2;
 162             st->codecpar->block_align = st->codecpar->block_align << 1;
 163         } else {
 164             channels = 1;
 165         }
 166         av_channel_layout_default(&st->codecpar->ch_layout, channels);
 167         st->codecpar->bit_rate = st->codecpar->sample_rate *
 168             st->codecpar->bits_per_coded_sample * channels;
 169
 170         /* calculate pts */
 171         num = st->codecpar->block_align;
 172         den = st->codecpar->sample_rate * channels;
 173         av_reduce(&num, &den, num, den, (1UL<<31)-1);
 174         if (vst)
 175             avpriv_set_pts_info(vst, 33, num, den);
 176         avpriv_set_pts_info(st, 33, num, den);
 177     }
 178     if (!s->nb_streams)
 179         return AVERROR_INVALIDDATA;
 180
 181     toc_offset = AV_RL32(&vmd->vmd_header[812]);
 182     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
 183     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
 184     avio_seek(pb, toc_offset, SEEK_SET);
 185
 186     raw_frame_table = NULL;
 187     vmd->frame_table = NULL;
 188     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
 189     raw_frame_table_size = vmd->frame_count * 6;
 190     raw_frame_table = av_malloc(raw_frame_table_size);
 191     vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
 192     if (!raw_frame_table || !vmd->frame_table) {
 193         ret = AVERROR(ENOMEM);
 194         goto error;
 195     }
 196     if ((ret = ffio_read_size(pb, raw_frame_table, raw_frame_table_size)) < 0)
 197         goto error;
 198
 199     total_frames = 0;
 200     for (i = 0; i < vmd->frame_count; i++) {
 201
 202         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
 203
 204         /* handle each entry in index block */
 205         for (j = 0; j < vmd->frames_per_block; j++) {
 206             int type;
 207             uint32_t size;
 208
 209             if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
 210                 av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
 211                 if (ret >= 0)
 212                     ret = AVERROR_INVALIDDATA;
 213                 goto error;
 214             }
 215             type = chunk[0];
 216             size = AV_RL32(&chunk[2]);
 217             if (size > INT_MAX / 2) {
 218                 av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
 219                 ret = AVERROR_INVALIDDATA;
 220                 goto error;
 221             }
 222             if(!size && type != 1)
 223                 continue;
 224             switch(type) {
 225             case 1: /* Audio Chunk */
 226                 if (!st) break;
 227                 /* first audio chunk contains several audio buffers */
 228                 vmd->frame_table[total_frames].frame_offset = current_offset;
 229                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
 230                 vmd->frame_table[total_frames].frame_size = size;
 231                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 232                 vmd->frame_table[total_frames].pts = current_audio_pts;
 233                 total_frames++;
 234                 if(!current_audio_pts)
 235                     current_audio_pts += sound_buffers - 1;
 236                 else
 237                     current_audio_pts++;
 238                 break;
 239             case 2: /* Video Chunk */
 240                 if (!vst)
 241                     break;
 242                 vmd->frame_table[total_frames].frame_offset = current_offset;
 243                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
 244                 vmd->frame_table[total_frames].frame_size = size;
 245                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 246                 vmd->frame_table[total_frames].pts = i;
 247                 total_frames++;
 248                 break;
 249             }
 250             current_offset += size;
 251         }
 252     }
 253
 254
 255     vmd->current_frame = 0;
 256     vmd->frame_count = total_frames;
 257
 258     ret = 0;
 259 error:
 260     av_freep(&raw_frame_table);
 261     return ret;
 262 }
 263
 264 static int vmd_read_packet(AVFormatContext *s,
 265                            AVPacket *pkt)
 266 {
 267     VmdDemuxContext *vmd = s->priv_data;
 268     AVIOContext *pb = s->pb;
 269     int ret = 0;
 270     vmd_frame *frame;
 271
 272     if (vmd->current_frame >= vmd->frame_count)
 273         return AVERROR_EOF;
 274
 275     frame = &vmd->frame_table[vmd->current_frame];
 276     /* position the stream (will probably be there already) */
 277     avio_seek(pb, frame->frame_offset, SEEK_SET);
 278
 279     if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
 280         return AVERROR_INVALIDDATA;
 281     ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
 282     if (ret < 0)
 283         return ret;
 284     pkt->pos= avio_tell(pb);
 285     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
 286     if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
 287         ret = ffio_read_size(pb, pkt->data, frame->frame_size);
 288     else
 289         ret = ffio_read_size(pb, pkt->data + BYTES_PER_FRAME_RECORD,
 290             frame->frame_size);
 291
 292     pkt->stream_index = frame->stream_index;
 293     pkt->pts = frame->pts;
 294     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
 295             (frame->frame_record[0] == 0x02) ? "video" : "audio",
 296             frame->frame_size + BYTES_PER_FRAME_RECORD,
 297             pkt->pts);
 298
 299     vmd->current_frame++;
 300
 301     return ret;
 302 }
 303
 304 static int vmd_read_close(AVFormatContext *s)
 305 {
 306     VmdDemuxContext *vmd = s->priv_data;
 307
 308     av_freep(&vmd->frame_table);
 309
 310     return 0;
 311 }
 312
 313 const FFInputFormat ff_vmd_demuxer = {
 314     .p.name         = "vmd",
 315     .p.long_name    = NULL_IF_CONFIG_SMALL("Sierra VMD"),
 316     .priv_data_size = sizeof(VmdDemuxContext),
 317     .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
 318     .read_probe     = vmd_probe,
 319     .read_header    = vmd_read_header,
 320     .read_packet    = vmd_read_packet,
 321     .read_close     = vmd_read_close,
 322 };