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 "avformat.h" 33#include "internal.h" 34#include "avio_internal.h" 35 36#define VMD_HEADER_SIZE 0x0330 37#define BYTES_PER_FRAME_RECORD 16 38 39typedef struct { 40 int stream_index; 41 int64_t frame_offset; 42 unsigned int frame_size; 43 int64_t pts; 44 int keyframe; 45 unsigned char frame_record[BYTES_PER_FRAME_RECORD]; 46} vmd_frame; 47 48typedef struct VmdDemuxContext { 49 int video_stream_index; 50 int audio_stream_index; 51 52 unsigned int frame_count; 53 unsigned int frames_per_block; 54 vmd_frame *frame_table; 55 unsigned int current_frame; 56 int is_indeo3; 57 58 int sample_rate; 59 int64_t audio_sample_counter; 60 int skiphdr; 61 62 unsigned char vmd_header[VMD_HEADER_SIZE]; 63} VmdDemuxContext; 64 65static int vmd_probe(AVProbeData *p) 66{ 67 int w, h, sample_rate; 68 if (p->buf_size < 806) 69 return 0; 70 /* check if the first 2 bytes of the file contain the appropriate size 71 * of a VMD header chunk */ 72 if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2) 73 return 0; 74 w = AV_RL16(&p->buf[12]); 75 h = AV_RL16(&p->buf[14]); 76 sample_rate = AV_RL16(&p->buf[804]); 77 if ((!w || w > 2048 || !h || h > 2048) && 78 sample_rate != 22050) 79 return 0; 80 81 /* only return half certainty since this check is a bit sketchy */ 82 return AVPROBE_SCORE_EXTENSION; 83} 84 85static int vmd_read_header(AVFormatContext *s) 86{ 87 VmdDemuxContext *vmd = s->priv_data; 88 AVIOContext *pb = s->pb; 89 AVStream *st = NULL, *vst = NULL; 90 unsigned int toc_offset; 91 unsigned char *raw_frame_table; 92 int raw_frame_table_size; 93 int64_t current_offset; 94 int i, j, ret; 95 int width, height; 96 unsigned int total_frames; 97 int64_t current_audio_pts = 0; 98 unsigned char chunk[BYTES_PER_FRAME_RECORD]; 99 int num, den; 100 int sound_buffers; 101 102 /* fetch the main header, including the 2 header length bytes */ 103 avio_seek(pb, 0, SEEK_SET); 104 if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE) 105 return AVERROR(EIO); 106 107 width = AV_RL16(&vmd->vmd_header[12]); 108 height = AV_RL16(&vmd->vmd_header[14]); 109 if (width && height) { 110 if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') { 111 vmd->is_indeo3 = 1; 112 } else { 113 vmd->is_indeo3 = 0; 114 } 115 /* start up the decoders */ 116 vst = avformat_new_stream(s, NULL); 117 if (!vst) 118 return AVERROR(ENOMEM); 119 avpriv_set_pts_info(vst, 33, 1, 10); 120 vmd->video_stream_index = vst->index; 121 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 122 vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO; 123 vst->codec->codec_tag = 0; /* no fourcc */ 124 vst->codec->width = width; 125 vst->codec->height = height; 126 if(vmd->is_indeo3 && vst->codec->width > 320){ 127 vst->codec->width >>= 1; 128 vst->codec->height >>= 1; 129 } 130 if (ff_alloc_extradata(vst->codec, VMD_HEADER_SIZE)) 131 return AVERROR(ENOMEM); 132 memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE); 133 } 134 135 /* if sample rate is 0, assume no audio */ 136 vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]); 137 if (vmd->sample_rate) { 138 st = avformat_new_stream(s, NULL); 139 if (!st) 140 return AVERROR(ENOMEM); 141 vmd->audio_stream_index = st->index; 142 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 143 st->codec->codec_id = AV_CODEC_ID_VMDAUDIO; 144 st->codec->codec_tag = 0; /* no fourcc */ 145 if (vmd->vmd_header[811] & 0x80) { 146 st->codec->channels = 2; 147 st->codec->channel_layout = AV_CH_LAYOUT_STEREO; 148 } else { 149 st->codec->channels = 1; 150 st->codec->channel_layout = AV_CH_LAYOUT_MONO; 151 } 152 st->codec->sample_rate = vmd->sample_rate; 153 st->codec->block_align = AV_RL16(&vmd->vmd_header[806]); 154 if (st->codec->block_align & 0x8000) { 155 st->codec->bits_per_coded_sample = 16; 156 st->codec->block_align = -(st->codec->block_align - 0x10000); 157 } else { 158 st->codec->bits_per_coded_sample = 8; 159 } 160 st->codec->bit_rate = st->codec->sample_rate * 161 st->codec->bits_per_coded_sample * st->codec->channels; 162 163 /* calculate pts */ 164 num = st->codec->block_align; 165 den = st->codec->sample_rate * st->codec->channels; 166 av_reduce(&num, &den, num, den, (1UL<<31)-1); 167 if (vst) 168 avpriv_set_pts_info(vst, 33, num, den); 169 avpriv_set_pts_info(st, 33, num, den); 170 } 171 172 toc_offset = AV_RL32(&vmd->vmd_header[812]); 173 vmd->frame_count = AV_RL16(&vmd->vmd_header[6]); 174 vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]); 175 avio_seek(pb, toc_offset, SEEK_SET); 176 177 raw_frame_table = NULL; 178 vmd->frame_table = NULL; 179 sound_buffers = AV_RL16(&vmd->vmd_header[808]); 180 raw_frame_table_size = vmd->frame_count * 6; 181 if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){ 182 av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n"); 183 return -1; 184 } 185 raw_frame_table = av_malloc(raw_frame_table_size); 186 vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame)); 187 if (!raw_frame_table || !vmd->frame_table) { 188 ret = AVERROR(ENOMEM); 189 goto error; 190 } 191 if (avio_read(pb, raw_frame_table, raw_frame_table_size) != 192 raw_frame_table_size) { 193 ret = AVERROR(EIO); 194 goto error; 195 } 196 197 total_frames = 0; 198 for (i = 0; i < vmd->frame_count; i++) { 199 200 current_offset = AV_RL32(&raw_frame_table[6 * i + 2]); 201 202 /* handle each entry in index block */ 203 for (j = 0; j < vmd->frames_per_block; j++) { 204 int type; 205 uint32_t size; 206 207 if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) { 208 av_log(s, AV_LOG_ERROR, "Failed to read frame record\n"); 209 if (ret >= 0) 210 ret = AVERROR_INVALIDDATA; 211 goto error; 212 } 213 type = chunk[0]; 214 size = AV_RL32(&chunk[2]); 215 if (size > INT_MAX / 2) { 216 av_log(s, AV_LOG_ERROR, "Invalid frame size\n"); 217 ret = AVERROR_INVALIDDATA; 218 goto error; 219 } 220 if(!size && type != 1) 221 continue; 222 switch(type) { 223 case 1: /* Audio Chunk */ 224 if (!st) break; 225 /* first audio chunk contains several audio buffers */ 226 vmd->frame_table[total_frames].frame_offset = current_offset; 227 vmd->frame_table[total_frames].stream_index = vmd->audio_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_audio_pts; 231 total_frames++; 232 if(!current_audio_pts) 233 current_audio_pts += sound_buffers - 1; 234 else 235 current_audio_pts++; 236 break; 237 case 2: /* Video Chunk */ 238 vmd->frame_table[total_frames].frame_offset = current_offset; 239 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index; 240 vmd->frame_table[total_frames].frame_size = size; 241 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); 242 vmd->frame_table[total_frames].pts = i; 243 total_frames++; 244 break; 245 } 246 current_offset += size; 247 } 248 } 249 250 av_free(raw_frame_table); 251 252 vmd->current_frame = 0; 253 vmd->frame_count = total_frames; 254 255 return 0; 256 257error: 258 av_freep(&raw_frame_table); 259 av_freep(&vmd->frame_table); 260 return ret; 261} 262 263static int vmd_read_packet(AVFormatContext *s, 264 AVPacket *pkt) 265{ 266 VmdDemuxContext *vmd = s->priv_data; 267 AVIOContext *pb = s->pb; 268 int ret = 0; 269 vmd_frame *frame; 270 271 if (vmd->current_frame >= vmd->frame_count) 272 return AVERROR_EOF; 273 274 frame = &vmd->frame_table[vmd->current_frame]; 275 /* position the stream (will probably be there already) */ 276 avio_seek(pb, frame->frame_offset, SEEK_SET); 277 278 if(ffio_limit(pb, frame->frame_size) != frame->frame_size) 279 return AVERROR(EIO); 280 if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD)) 281 return AVERROR(ENOMEM); 282 pkt->pos= avio_tell(pb); 283 memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD); 284 if(vmd->is_indeo3 && frame->frame_record[0] == 0x02) 285 ret = avio_read(pb, pkt->data, frame->frame_size); 286 else 287 ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD, 288 frame->frame_size); 289 290 if (ret != frame->frame_size) { 291 av_free_packet(pkt); 292 ret = AVERROR(EIO); 293 } 294 pkt->stream_index = frame->stream_index; 295 pkt->pts = frame->pts; 296 av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n", 297 (frame->frame_record[0] == 0x02) ? "video" : "audio", 298 frame->frame_size + BYTES_PER_FRAME_RECORD, 299 pkt->pts); 300 301 vmd->current_frame++; 302 303 return ret; 304} 305 306static int vmd_read_close(AVFormatContext *s) 307{ 308 VmdDemuxContext *vmd = s->priv_data; 309 310 av_freep(&vmd->frame_table); 311 312 return 0; 313} 314 315AVInputFormat ff_vmd_demuxer = { 316 .name = "vmd", 317 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"), 318 .priv_data_size = sizeof(VmdDemuxContext), 319 .read_probe = vmd_probe, 320 .read_header = vmd_read_header, 321 .read_packet = vmd_read_packet, 322 .read_close = vmd_read_close, 323}; 324