| 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 | |
| 39 | typedef 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 | |
| 48 | typedef 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 | |
| 65 | static 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 | |
| 85 | static 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 | |
| 257 | error: |
| 258 | av_freep(&raw_frame_table); |
| 259 | av_freep(&vmd->frame_table); |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | static 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 | |
| 306 | static 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 | |
| 315 | AVInputFormat 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 | }; |