1/* 2 * Sierra VMD Format Demuxer 3 * Copyright (c) 2004 The ffmpeg Project 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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/intreadwrite.h" 31#include "avformat.h" 32#include "internal.h" 33 34#define VMD_HEADER_SIZE 0x0330 35#define BYTES_PER_FRAME_RECORD 16 36 37typedef struct { 38 int stream_index; 39 int64_t frame_offset; 40 unsigned int frame_size; 41 int64_t pts; 42 int keyframe; 43 unsigned char frame_record[BYTES_PER_FRAME_RECORD]; 44} vmd_frame; 45 46typedef struct VmdDemuxContext { 47 int video_stream_index; 48 int audio_stream_index; 49 50 unsigned int frame_count; 51 unsigned int frames_per_block; 52 vmd_frame *frame_table; 53 unsigned int current_frame; 54 int is_indeo3; 55 56 int sample_rate; 57 int64_t audio_sample_counter; 58 int skiphdr; 59 60 unsigned char vmd_header[VMD_HEADER_SIZE]; 61} VmdDemuxContext; 62 63static int vmd_probe(AVProbeData *p) 64{ 65 int w, h; 66 if (p->buf_size < 16) 67 return 0; 68 /* check if the first 2 bytes of the file contain the appropriate size 69 * of a VMD header chunk */ 70 if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2) 71 return 0; 72 w = AV_RL16(&p->buf[12]); 73 h = AV_RL16(&p->buf[14]); 74 if (!w || w > 2048 || !h || h > 2048) 75 return 0; 76 77 /* only return half certainty since this check is a bit sketchy */ 78 return AVPROBE_SCORE_MAX / 2; 79} 80 81static int vmd_read_header(AVFormatContext *s, 82 AVFormatParameters *ap) 83{ 84 VmdDemuxContext *vmd = s->priv_data; 85 AVIOContext *pb = s->pb; 86 AVStream *st = NULL, *vst; 87 unsigned int toc_offset; 88 unsigned char *raw_frame_table; 89 int raw_frame_table_size; 90 int64_t current_offset; 91 int i, j; 92 unsigned int total_frames; 93 int64_t current_audio_pts = 0; 94 unsigned char chunk[BYTES_PER_FRAME_RECORD]; 95 int num, den; 96 int sound_buffers; 97 98 /* fetch the main header, including the 2 header length bytes */ 99 avio_seek(pb, 0, SEEK_SET); 100 if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE) 101 return AVERROR(EIO); 102 103 if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') 104 vmd->is_indeo3 = 1; 105 else 106 vmd->is_indeo3 = 0; 107 /* start up the decoders */ 108 vst = avformat_new_stream(s, NULL); 109 if (!vst) 110 return AVERROR(ENOMEM); 111 avpriv_set_pts_info(vst, 33, 1, 10); 112 vmd->video_stream_index = vst->index; 113 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 114 vst->codec->codec_id = vmd->is_indeo3 ? CODEC_ID_INDEO3 : CODEC_ID_VMDVIDEO; 115 vst->codec->codec_tag = 0; /* no fourcc */ 116 vst->codec->width = AV_RL16(&vmd->vmd_header[12]); 117 vst->codec->height = AV_RL16(&vmd->vmd_header[14]); 118 if(vmd->is_indeo3 && vst->codec->width > 320){ 119 vst->codec->width >>= 1; 120 vst->codec->height >>= 1; 121 } 122 vst->codec->extradata_size = VMD_HEADER_SIZE; 123 vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); 124 memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE); 125 126 /* if sample rate is 0, assume no audio */ 127 vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]); 128 if (vmd->sample_rate) { 129 st = avformat_new_stream(s, NULL); 130 if (!st) 131 return AVERROR(ENOMEM); 132 vmd->audio_stream_index = st->index; 133 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 134 st->codec->codec_id = CODEC_ID_VMDAUDIO; 135 st->codec->codec_tag = 0; /* no fourcc */ 136 st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1; 137 st->codec->sample_rate = vmd->sample_rate; 138 st->codec->block_align = AV_RL16(&vmd->vmd_header[806]); 139 if (st->codec->block_align & 0x8000) { 140 st->codec->bits_per_coded_sample = 16; 141 st->codec->block_align = -(st->codec->block_align - 0x10000); 142 } else { 143 st->codec->bits_per_coded_sample = 8; 144 } 145 st->codec->bit_rate = st->codec->sample_rate * 146 st->codec->bits_per_coded_sample * st->codec->channels; 147 148 /* calculate pts */ 149 num = st->codec->block_align; 150 den = st->codec->sample_rate * st->codec->channels; 151 av_reduce(&den, &num, den, num, (1UL<<31)-1); 152 avpriv_set_pts_info(vst, 33, num, den); 153 avpriv_set_pts_info(st, 33, num, den); 154 } 155 156 toc_offset = AV_RL32(&vmd->vmd_header[812]); 157 vmd->frame_count = AV_RL16(&vmd->vmd_header[6]); 158 vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]); 159 avio_seek(pb, toc_offset, SEEK_SET); 160 161 raw_frame_table = NULL; 162 vmd->frame_table = NULL; 163 sound_buffers = AV_RL16(&vmd->vmd_header[808]); 164 raw_frame_table_size = vmd->frame_count * 6; 165 if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){ 166 av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n"); 167 return -1; 168 } 169 raw_frame_table = av_malloc(raw_frame_table_size); 170 vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame)); 171 if (!raw_frame_table || !vmd->frame_table) { 172 av_free(raw_frame_table); 173 av_free(vmd->frame_table); 174 return AVERROR(ENOMEM); 175 } 176 if (avio_read(pb, raw_frame_table, raw_frame_table_size) != 177 raw_frame_table_size) { 178 av_free(raw_frame_table); 179 av_free(vmd->frame_table); 180 return AVERROR(EIO); 181 } 182 183 total_frames = 0; 184 for (i = 0; i < vmd->frame_count; i++) { 185 186 current_offset = AV_RL32(&raw_frame_table[6 * i + 2]); 187 188 /* handle each entry in index block */ 189 for (j = 0; j < vmd->frames_per_block; j++) { 190 int type; 191 uint32_t size; 192 193 avio_read(pb, chunk, BYTES_PER_FRAME_RECORD); 194 type = chunk[0]; 195 size = AV_RL32(&chunk[2]); 196 if(!size && type != 1) 197 continue; 198 switch(type) { 199 case 1: /* Audio Chunk */ 200 if (!st) break; 201 /* first audio chunk contains several audio buffers */ 202 vmd->frame_table[total_frames].frame_offset = current_offset; 203 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index; 204 vmd->frame_table[total_frames].frame_size = size; 205 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); 206 vmd->frame_table[total_frames].pts = current_audio_pts; 207 total_frames++; 208 if(!current_audio_pts) 209 current_audio_pts += sound_buffers - 1; 210 else 211 current_audio_pts++; 212 break; 213 case 2: /* Video Chunk */ 214 vmd->frame_table[total_frames].frame_offset = current_offset; 215 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index; 216 vmd->frame_table[total_frames].frame_size = size; 217 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); 218 vmd->frame_table[total_frames].pts = i; 219 total_frames++; 220 break; 221 } 222 current_offset += size; 223 } 224 } 225 226 av_free(raw_frame_table); 227 228 vmd->current_frame = 0; 229 vmd->frame_count = total_frames; 230 231 return 0; 232} 233 234static int vmd_read_packet(AVFormatContext *s, 235 AVPacket *pkt) 236{ 237 VmdDemuxContext *vmd = s->priv_data; 238 AVIOContext *pb = s->pb; 239 int ret = 0; 240 vmd_frame *frame; 241 242 if (vmd->current_frame >= vmd->frame_count) 243 return AVERROR(EIO); 244 245 frame = &vmd->frame_table[vmd->current_frame]; 246 /* position the stream (will probably be there already) */ 247 avio_seek(pb, frame->frame_offset, SEEK_SET); 248 249 if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD)) 250 return AVERROR(ENOMEM); 251 pkt->pos= avio_tell(pb); 252 memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD); 253 if(vmd->is_indeo3 && frame->frame_record[0] == 0x02) 254 ret = avio_read(pb, pkt->data, frame->frame_size); 255 else 256 ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD, 257 frame->frame_size); 258 259 if (ret != frame->frame_size) { 260 av_free_packet(pkt); 261 ret = AVERROR(EIO); 262 } 263 pkt->stream_index = frame->stream_index; 264 pkt->pts = frame->pts; 265 av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n", 266 (frame->frame_record[0] == 0x02) ? "video" : "audio", 267 frame->frame_size + BYTES_PER_FRAME_RECORD, 268 pkt->pts); 269 270 vmd->current_frame++; 271 272 return ret; 273} 274 275static int vmd_read_close(AVFormatContext *s) 276{ 277 VmdDemuxContext *vmd = s->priv_data; 278 279 av_free(vmd->frame_table); 280 281 return 0; 282} 283 284AVInputFormat ff_vmd_demuxer = { 285 .name = "vmd", 286 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD format"), 287 .priv_data_size = sizeof(VmdDemuxContext), 288 .read_probe = vmd_probe, 289 .read_header = vmd_read_header, 290 .read_packet = vmd_read_packet, 291 .read_close = vmd_read_close, 292}; 293