git.sesse.net Git - ffmpeg/blob - 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 sierravmd.c
  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 "avformat.h"
  31
  32 #define VMD_HEADER_SIZE 0x0330
  33 #define BYTES_PER_FRAME_RECORD 16
  34
  35 typedef struct {
  36   int stream_index;
  37   offset_t frame_offset;
  38   unsigned int frame_size;
  39   int64_t pts;
  40   int keyframe;
  41   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
  42 } vmd_frame_t;
  43
  44 typedef struct VmdDemuxContext {
  45     int video_stream_index;
  46     int audio_stream_index;
  47
  48     unsigned int frame_count;
  49     unsigned int frames_per_block;
  50     vmd_frame_t *frame_table;
  51     unsigned int current_frame;
  52
  53     int sample_rate;
  54     int64_t audio_sample_counter;
  55     int skiphdr;
  56
  57     unsigned char vmd_header[VMD_HEADER_SIZE];
  58 } VmdDemuxContext;
  59
  60 static int vmd_probe(AVProbeData *p)
  61 {
  62     if (p->buf_size < 2)
  63         return 0;
  64
  65     /* check if the first 2 bytes of the file contain the appropriate size
  66      * of a VMD header chunk */
  67     if (LE_16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
  68         return 0;
  69
  70     /* only return half certainty since this check is a bit sketchy */
  71     return AVPROBE_SCORE_MAX / 2;
  72 }
  73
  74 static int vmd_read_header(AVFormatContext *s,
  75                            AVFormatParameters *ap)
  76 {
  77     VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
  78     ByteIOContext *pb = &s->pb;
  79     AVStream *st, *vst;
  80     unsigned int toc_offset;
  81     unsigned char *raw_frame_table;
  82     int raw_frame_table_size;
  83     offset_t current_offset;
  84     int i, j;
  85     unsigned int total_frames;
  86     int64_t pts_inc = 1;
  87     int64_t current_video_pts = 0, current_audio_pts = 0;
  88     unsigned char chunk[BYTES_PER_FRAME_RECORD];
  89     int num, den;
  90     int sound_buffers;
  91
  92     /* fetch the main header, including the 2 header length bytes */
  93     url_fseek(pb, 0, SEEK_SET);
  94     if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
  95         return AVERROR_IO;
  96
  97     /* start up the decoders */
  98     vst = av_new_stream(s, 0);
  99     if (!vst)
 100         return AVERROR_NOMEM;
 101     av_set_pts_info(vst, 33, 1, 10);
 102     vmd->video_stream_index = vst->index;
 103     vst->codec->codec_type = CODEC_TYPE_VIDEO;
 104     vst->codec->codec_id = CODEC_ID_VMDVIDEO;
 105     vst->codec->codec_tag = 0;  /* no fourcc */
 106     vst->codec->width = LE_16(&vmd->vmd_header[12]);
 107     vst->codec->height = LE_16(&vmd->vmd_header[14]);
 108     vst->codec->extradata_size = VMD_HEADER_SIZE;
 109     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 110     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
 111
 112     /* if sample rate is 0, assume no audio */
 113     vmd->sample_rate = LE_16(&vmd->vmd_header[804]);
 114     if (vmd->sample_rate) {
 115         st = av_new_stream(s, 0);
 116         if (!st)
 117             return AVERROR_NOMEM;
 118         vmd->audio_stream_index = st->index;
 119         st->codec->codec_type = CODEC_TYPE_AUDIO;
 120         st->codec->codec_id = CODEC_ID_VMDAUDIO;
 121         st->codec->codec_tag = 0;  /* no fourcc */
 122         st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
 123         st->codec->sample_rate = vmd->sample_rate;
 124         st->codec->block_align = LE_16(&vmd->vmd_header[806]);
 125         if (st->codec->block_align & 0x8000) {
 126             st->codec->bits_per_sample = 16;
 127             st->codec->block_align = -(st->codec->block_align - 0x10000);
 128         } else {
 129             st->codec->bits_per_sample = 8;
 130         }
 131         st->codec->bit_rate = st->codec->sample_rate *
 132             st->codec->bits_per_sample * st->codec->channels;
 133
 134         /* calculate pts */
 135         num = st->codec->block_align;
 136         den = st->codec->sample_rate * st->codec->channels;
 137         av_reduce(&den, &num, den, num, (1UL<<31)-1);
 138         av_set_pts_info(vst, 33, num, den);
 139         av_set_pts_info(st, 33, num, den);
 140         pts_inc = num;
 141     }
 142
 143     toc_offset = LE_32(&vmd->vmd_header[812]);
 144     vmd->frame_count = LE_16(&vmd->vmd_header[6]);
 145     vmd->frames_per_block = LE_16(&vmd->vmd_header[18]);
 146     url_fseek(pb, toc_offset, SEEK_SET);
 147
 148     raw_frame_table = NULL;
 149     vmd->frame_table = NULL;
 150     sound_buffers = LE_16(&vmd->vmd_header[808]);
 151     raw_frame_table_size = vmd->frame_count * 6;
 152     raw_frame_table = av_malloc(raw_frame_table_size);
 153     if(vmd->frame_count * vmd->frames_per_block  >= UINT_MAX / sizeof(vmd_frame_t)){
 154         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
 155         return -1;
 156     }
 157     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame_t));
 158     if (!raw_frame_table || !vmd->frame_table) {
 159         av_free(raw_frame_table);
 160         av_free(vmd->frame_table);
 161         return AVERROR_NOMEM;
 162     }
 163     if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
 164         raw_frame_table_size) {
 165         av_free(raw_frame_table);
 166         av_free(vmd->frame_table);
 167         return AVERROR_IO;
 168     }
 169
 170     total_frames = 0;
 171     for (i = 0; i < vmd->frame_count; i++) {
 172
 173         current_offset = LE_32(&raw_frame_table[6 * i + 2]);
 174
 175         /* handle each entry in index block */
 176         for (j = 0; j < vmd->frames_per_block; j++) {
 177             int type;
 178             uint32_t size;
 179
 180             get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
 181             type = chunk[0];
 182             size = LE_32(&chunk[2]);
 183             if(!size)
 184                 continue;
 185             switch(type) {
 186             case 1: /* Audio Chunk */
 187                 /* first audio chunk contains several audio buffers */
 188                 if(current_audio_pts){
 189                     vmd->frame_table[total_frames].frame_offset = current_offset;
 190                     vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
 191                     vmd->frame_table[total_frames].frame_size = size;
 192                     memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 193                     vmd->frame_table[total_frames].pts = current_audio_pts;
 194                     total_frames++;
 195                     current_audio_pts += pts_inc;
 196                 }else{
 197                     uint32_t flags;
 198                     int k;
 199                     int noff;
 200                     int64_t pos;
 201
 202                     pos = url_ftell(pb);
 203                     url_fseek(pb, current_offset, SEEK_SET);
 204                     flags = get_le32(pb);
 205                     noff = 4;
 206                     url_fseek(pb, pos, SEEK_SET);
 207                     av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers);
 208                     for(k = 0; k < sound_buffers - 1; k++){
 209                         if(flags & 1) { /* silent block */
 210                             vmd->frame_table[total_frames].frame_size = 0;
 211                         }else{
 212                             vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1);
 213                         }
 214                         noff += vmd->frame_table[total_frames].frame_size;
 215                         vmd->frame_table[total_frames].frame_offset = current_offset + noff;
 216                         vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
 217                         memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 218                         vmd->frame_table[total_frames].pts = current_audio_pts;
 219                         total_frames++;
 220                         current_audio_pts += pts_inc;
 221                         flags >>= 1;
 222                     }
 223                 }
 224                 break;
 225             case 2: /* Video Chunk */
 226                 vmd->frame_table[total_frames].frame_offset = current_offset;
 227                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
 228                 vmd->frame_table[total_frames].frame_size = size;
 229                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 230                 vmd->frame_table[total_frames].pts = current_video_pts;
 231                 total_frames++;
 232                 break;
 233             }
 234             current_offset += size;
 235         }
 236         current_video_pts += pts_inc;
 237     }
 238
 239     av_free(raw_frame_table);
 240
 241     vmd->current_frame = 0;
 242     vmd->frame_count = total_frames;
 243
 244     return 0;
 245 }
 246
 247 static int vmd_read_packet(AVFormatContext *s,
 248                            AVPacket *pkt)
 249 {
 250     VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
 251     ByteIOContext *pb = &s->pb;
 252     int ret = 0;
 253     vmd_frame_t *frame;
 254
 255     if (vmd->current_frame >= vmd->frame_count)
 256         return AVERROR_IO;
 257
 258     frame = &vmd->frame_table[vmd->current_frame];
 259     /* position the stream (will probably be there already) */
 260     url_fseek(pb, frame->frame_offset, SEEK_SET);
 261
 262     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
 263         return AVERROR_NOMEM;
 264     pkt->pos= url_ftell(pb);
 265     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
 266     ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
 267         frame->frame_size);
 268
 269     if (ret != frame->frame_size) {
 270         av_free_packet(pkt);
 271         ret = AVERROR_IO;
 272     }
 273     pkt->stream_index = frame->stream_index;
 274     pkt->pts = frame->pts;
 275     av_log(NULL, AV_LOG_INFO, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
 276             (frame->frame_record[0] == 0x02) ? "video" : "audio",
 277             frame->frame_size + BYTES_PER_FRAME_RECORD,
 278             pkt->pts);
 279
 280     vmd->current_frame++;
 281
 282     return ret;
 283 }
 284
 285 static int vmd_read_close(AVFormatContext *s)
 286 {
 287     VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
 288
 289     av_free(vmd->frame_table);
 290
 291     return 0;
 292 }
 293
 294 AVInputFormat vmd_demuxer = {
 295     "vmd",
 296     "Sierra VMD format",
 297     sizeof(VmdDemuxContext),
 298     vmd_probe,
 299     vmd_read_header,
 300     vmd_read_packet,
 301     vmd_read_close,
 302 };