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 libavformat/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 "libavutil/intreadwrite.h"
  31 #include "avformat.h"
  32
  33 #define VMD_HEADER_SIZE 0x0330
  34 #define BYTES_PER_FRAME_RECORD 16
  35
  36 typedef struct {
  37   int stream_index;
  38   int64_t frame_offset;
  39   unsigned int frame_size;
  40   int64_t pts;
  41   int keyframe;
  42   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
  43 } vmd_frame;
  44
  45 typedef struct VmdDemuxContext {
  46     int video_stream_index;
  47     int audio_stream_index;
  48
  49     unsigned int frame_count;
  50     unsigned int frames_per_block;
  51     vmd_frame *frame_table;
  52     unsigned int current_frame;
  53     int is_indeo3;
  54
  55     int sample_rate;
  56     int64_t audio_sample_counter;
  57     int skiphdr;
  58
  59     unsigned char vmd_header[VMD_HEADER_SIZE];
  60 } VmdDemuxContext;
  61
  62 static int vmd_probe(AVProbeData *p)
  63 {
  64     int w, h;
  65     if (p->buf_size < 16)
  66         return 0;
  67     /* check if the first 2 bytes of the file contain the appropriate size
  68      * of a VMD header chunk */
  69     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
  70         return 0;
  71     w = AV_RL16(&p->buf[12]);
  72     h = AV_RL16(&p->buf[14]);
  73     if (!w || w > 2048 || !h || h > 2048)
  74         return 0;
  75
  76     /* only return half certainty since this check is a bit sketchy */
  77     return AVPROBE_SCORE_MAX / 2;
  78 }
  79
  80 static int vmd_read_header(AVFormatContext *s,
  81                            AVFormatParameters *ap)
  82 {
  83     VmdDemuxContext *vmd = s->priv_data;
  84     ByteIOContext *pb = s->pb;
  85     AVStream *st = NULL, *vst;
  86     unsigned int toc_offset;
  87     unsigned char *raw_frame_table;
  88     int raw_frame_table_size;
  89     int64_t current_offset;
  90     int i, j;
  91     unsigned int total_frames;
  92     int64_t current_audio_pts = 0;
  93     unsigned char chunk[BYTES_PER_FRAME_RECORD];
  94     int num, den;
  95     int sound_buffers;
  96
  97     /* fetch the main header, including the 2 header length bytes */
  98     url_fseek(pb, 0, SEEK_SET);
  99     if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
 100         return AVERROR(EIO);
 101
 102     if(vmd->vmd_header[16] == 'i' && vmd->vmd_header[17] == 'v' && vmd->vmd_header[18] == '3')
 103         vmd->is_indeo3 = 1;
 104     else
 105         vmd->is_indeo3 = 0;
 106     /* start up the decoders */
 107     vst = av_new_stream(s, 0);
 108     if (!vst)
 109         return AVERROR(ENOMEM);
 110     av_set_pts_info(vst, 33, 1, 10);
 111     vmd->video_stream_index = vst->index;
 112     vst->codec->codec_type = CODEC_TYPE_VIDEO;
 113     vst->codec->codec_id = vmd->is_indeo3 ? CODEC_ID_INDEO3 : CODEC_ID_VMDVIDEO;
 114     vst->codec->codec_tag = 0;  /* no fourcc */
 115     vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
 116     vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
 117     if(vmd->is_indeo3 && vst->codec->width > 320){
 118         vst->codec->width >>= 1;
 119         vst->codec->height >>= 1;
 120     }
 121     vst->codec->extradata_size = VMD_HEADER_SIZE;
 122     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
 123     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
 124
 125     /* if sample rate is 0, assume no audio */
 126     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
 127     if (vmd->sample_rate) {
 128         st = av_new_stream(s, 0);
 129         if (!st)
 130             return AVERROR(ENOMEM);
 131         vmd->audio_stream_index = st->index;
 132         st->codec->codec_type = CODEC_TYPE_AUDIO;
 133         st->codec->codec_id = CODEC_ID_VMDAUDIO;
 134         st->codec->codec_tag = 0;  /* no fourcc */
 135         st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
 136         st->codec->sample_rate = vmd->sample_rate;
 137         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
 138         if (st->codec->block_align & 0x8000) {
 139             st->codec->bits_per_coded_sample = 16;
 140             st->codec->block_align = -(st->codec->block_align - 0x10000);
 141         } else {
 142             st->codec->bits_per_coded_sample = 8;
 143         }
 144         st->codec->bit_rate = st->codec->sample_rate *
 145             st->codec->bits_per_coded_sample * st->codec->channels;
 146
 147         /* calculate pts */
 148         num = st->codec->block_align;
 149         den = st->codec->sample_rate * st->codec->channels;
 150         av_reduce(&den, &num, den, num, (1UL<<31)-1);
 151         av_set_pts_info(vst, 33, num, den);
 152         av_set_pts_info(st, 33, num, den);
 153     }
 154
 155     toc_offset = AV_RL32(&vmd->vmd_header[812]);
 156     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
 157     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
 158     url_fseek(pb, toc_offset, SEEK_SET);
 159
 160     raw_frame_table = NULL;
 161     vmd->frame_table = NULL;
 162     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
 163     raw_frame_table_size = vmd->frame_count * 6;
 164     if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
 165         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
 166         return -1;
 167     }
 168     raw_frame_table = av_malloc(raw_frame_table_size);
 169     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
 170     if (!raw_frame_table || !vmd->frame_table) {
 171         av_free(raw_frame_table);
 172         av_free(vmd->frame_table);
 173         return AVERROR(ENOMEM);
 174     }
 175     if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
 176         raw_frame_table_size) {
 177         av_free(raw_frame_table);
 178         av_free(vmd->frame_table);
 179         return AVERROR(EIO);
 180     }
 181
 182     total_frames = 0;
 183     for (i = 0; i < vmd->frame_count; i++) {
 184
 185         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
 186
 187         /* handle each entry in index block */
 188         for (j = 0; j < vmd->frames_per_block; j++) {
 189             int type;
 190             uint32_t size;
 191
 192             get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
 193             type = chunk[0];
 194             size = AV_RL32(&chunk[2]);
 195             if(!size && type != 1)
 196                 continue;
 197             switch(type) {
 198             case 1: /* Audio Chunk */
 199                 if (!st) break;
 200                 /* first audio chunk contains several audio buffers */
 201                 vmd->frame_table[total_frames].frame_offset = current_offset;
 202                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
 203                 vmd->frame_table[total_frames].frame_size = size;
 204                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 205                 vmd->frame_table[total_frames].pts = current_audio_pts;
 206                 total_frames++;
 207                 if(!current_audio_pts)
 208                     current_audio_pts += sound_buffers;
 209                 else
 210                     current_audio_pts++;
 211                 break;
 212             case 2: /* Video Chunk */
 213                 vmd->frame_table[total_frames].frame_offset = current_offset;
 214                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
 215                 vmd->frame_table[total_frames].frame_size = size;
 216                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
 217                 vmd->frame_table[total_frames].pts = i;
 218                 total_frames++;
 219                 break;
 220             }
 221             current_offset += size;
 222         }
 223     }
 224
 225     av_free(raw_frame_table);
 226
 227     vmd->current_frame = 0;
 228     vmd->frame_count = total_frames;
 229
 230     return 0;
 231 }
 232
 233 static int vmd_read_packet(AVFormatContext *s,
 234                            AVPacket *pkt)
 235 {
 236     VmdDemuxContext *vmd = s->priv_data;
 237     ByteIOContext *pb = s->pb;
 238     int ret = 0;
 239     vmd_frame *frame;
 240
 241     if (vmd->current_frame >= vmd->frame_count)
 242         return AVERROR(EIO);
 243
 244     frame = &vmd->frame_table[vmd->current_frame];
 245     /* position the stream (will probably be there already) */
 246     url_fseek(pb, frame->frame_offset, SEEK_SET);
 247
 248     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
 249         return AVERROR(ENOMEM);
 250     pkt->pos= url_ftell(pb);
 251     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
 252     if(vmd->is_indeo3)
 253         ret = get_buffer(pb, pkt->data, frame->frame_size);
 254     else
 255         ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
 256             frame->frame_size);
 257
 258     if (ret != frame->frame_size) {
 259         av_free_packet(pkt);
 260         ret = AVERROR(EIO);
 261     }
 262     pkt->stream_index = frame->stream_index;
 263     pkt->pts = frame->pts;
 264     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
 265             (frame->frame_record[0] == 0x02) ? "video" : "audio",
 266             frame->frame_size + BYTES_PER_FRAME_RECORD,
 267             pkt->pts);
 268
 269     vmd->current_frame++;
 270
 271     return ret;
 272 }
 273
 274 static int vmd_read_close(AVFormatContext *s)
 275 {
 276     VmdDemuxContext *vmd = s->priv_data;
 277
 278     av_free(vmd->frame_table);
 279
 280     return 0;
 281 }
 282
 283 AVInputFormat vmd_demuxer = {
 284     "vmd",
 285     NULL_IF_CONFIG_SMALL("Sierra VMD format"),
 286     sizeof(VmdDemuxContext),
 287     vmd_probe,
 288     vmd_read_header,
 289     vmd_read_packet,
 290     vmd_read_close,
 291 };