| 1 | /* |
| 2 | * GXF demuxer. |
| 3 | * Copyright (c) 2006 Reimar Doeffinger |
| 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 | #include <inttypes.h> |
| 23 | |
| 24 | #include "libavutil/channel_layout.h" |
| 25 | #include "libavutil/common.h" |
| 26 | #include "avformat.h" |
| 27 | #include "internal.h" |
| 28 | #include "gxf.h" |
| 29 | #include "libavcodec/mpeg12data.h" |
| 30 | |
| 31 | struct gxf_stream_info { |
| 32 | int64_t first_field; |
| 33 | int64_t last_field; |
| 34 | AVRational frames_per_second; |
| 35 | int32_t fields_per_frame; |
| 36 | int64_t track_aux_data; |
| 37 | }; |
| 38 | |
| 39 | /** |
| 40 | * @brief parse gxf timecode and add it to metadata |
| 41 | */ |
| 42 | static int add_timecode_metadata(AVDictionary **pm, const char *key, uint32_t timecode, int fields_per_frame) |
| 43 | { |
| 44 | char tmp[128]; |
| 45 | int field = timecode & 0xff; |
| 46 | int frame = fields_per_frame ? field / fields_per_frame : field; |
| 47 | int second = (timecode >> 8) & 0xff; |
| 48 | int minute = (timecode >> 16) & 0xff; |
| 49 | int hour = (timecode >> 24) & 0x1f; |
| 50 | int drop = (timecode >> 29) & 1; |
| 51 | // bit 30: color_frame, unused |
| 52 | // ignore invalid time code |
| 53 | if (timecode >> 31) |
| 54 | return 0; |
| 55 | snprintf(tmp, sizeof(tmp), "%02d:%02d:%02d%c%02d", |
| 56 | hour, minute, second, drop ? ';' : ':', frame); |
| 57 | return av_dict_set(pm, key, tmp, 0); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * @brief parses a packet header, extracting type and length |
| 62 | * @param pb AVIOContext to read header from |
| 63 | * @param type detected packet type is stored here |
| 64 | * @param length detected packet length, excluding header is stored here |
| 65 | * @return 0 if header not found or contains invalid data, 1 otherwise |
| 66 | */ |
| 67 | static int parse_packet_header(AVIOContext *pb, GXFPktType *type, int *length) { |
| 68 | if (avio_rb32(pb)) |
| 69 | return 0; |
| 70 | if (avio_r8(pb) != 1) |
| 71 | return 0; |
| 72 | *type = avio_r8(pb); |
| 73 | *length = avio_rb32(pb); |
| 74 | if ((*length >> 24) || *length < 16) |
| 75 | return 0; |
| 76 | *length -= 16; |
| 77 | if (avio_rb32(pb)) |
| 78 | return 0; |
| 79 | if (avio_r8(pb) != 0xe1) |
| 80 | return 0; |
| 81 | if (avio_r8(pb) != 0xe2) |
| 82 | return 0; |
| 83 | return 1; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * @brief check if file starts with a PKT_MAP header |
| 88 | */ |
| 89 | static int gxf_probe(AVProbeData *p) { |
| 90 | static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet |
| 91 | static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2}; |
| 92 | if (!memcmp(p->buf, startcode, sizeof(startcode)) && |
| 93 | !memcmp(&p->buf[16 - sizeof(endcode)], endcode, sizeof(endcode))) |
| 94 | return AVPROBE_SCORE_MAX; |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * @brief gets the stream index for the track with the specified id, creates new |
| 100 | * stream if not found |
| 101 | * @param id id of stream to find / add |
| 102 | * @param format stream format identifier |
| 103 | */ |
| 104 | static int get_sindex(AVFormatContext *s, int id, int format) { |
| 105 | int i; |
| 106 | AVStream *st = NULL; |
| 107 | i = ff_find_stream_index(s, id); |
| 108 | if (i >= 0) |
| 109 | return i; |
| 110 | st = avformat_new_stream(s, NULL); |
| 111 | if (!st) |
| 112 | return AVERROR(ENOMEM); |
| 113 | st->id = id; |
| 114 | switch (format) { |
| 115 | case 3: |
| 116 | case 4: |
| 117 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 118 | st->codec->codec_id = AV_CODEC_ID_MJPEG; |
| 119 | break; |
| 120 | case 13: |
| 121 | case 14: |
| 122 | case 15: |
| 123 | case 16: |
| 124 | case 25: |
| 125 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 126 | st->codec->codec_id = AV_CODEC_ID_DVVIDEO; |
| 127 | break; |
| 128 | case 11: |
| 129 | case 12: |
| 130 | case 20: |
| 131 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 132 | st->codec->codec_id = AV_CODEC_ID_MPEG2VIDEO; |
| 133 | st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. |
| 134 | break; |
| 135 | case 22: |
| 136 | case 23: |
| 137 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 138 | st->codec->codec_id = AV_CODEC_ID_MPEG1VIDEO; |
| 139 | st->need_parsing = AVSTREAM_PARSE_HEADERS; //get keyframe flag etc. |
| 140 | break; |
| 141 | case 9: |
| 142 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 143 | st->codec->codec_id = AV_CODEC_ID_PCM_S24LE; |
| 144 | st->codec->channels = 1; |
| 145 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| 146 | st->codec->sample_rate = 48000; |
| 147 | st->codec->bit_rate = 3 * 1 * 48000 * 8; |
| 148 | st->codec->block_align = 3 * 1; |
| 149 | st->codec->bits_per_coded_sample = 24; |
| 150 | break; |
| 151 | case 10: |
| 152 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 153 | st->codec->codec_id = AV_CODEC_ID_PCM_S16LE; |
| 154 | st->codec->channels = 1; |
| 155 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| 156 | st->codec->sample_rate = 48000; |
| 157 | st->codec->bit_rate = 2 * 1 * 48000 * 8; |
| 158 | st->codec->block_align = 2 * 1; |
| 159 | st->codec->bits_per_coded_sample = 16; |
| 160 | break; |
| 161 | case 17: |
| 162 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 163 | st->codec->codec_id = AV_CODEC_ID_AC3; |
| 164 | st->codec->channels = 2; |
| 165 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
| 166 | st->codec->sample_rate = 48000; |
| 167 | break; |
| 168 | case 26: /* AVCi50 / AVCi100 (AVC Intra) */ |
| 169 | case 29: /* AVCHD */ |
| 170 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 171 | st->codec->codec_id = AV_CODEC_ID_H264; |
| 172 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
| 173 | break; |
| 174 | // timecode tracks: |
| 175 | case 7: |
| 176 | case 8: |
| 177 | case 24: |
| 178 | st->codec->codec_type = AVMEDIA_TYPE_DATA; |
| 179 | st->codec->codec_id = AV_CODEC_ID_NONE; |
| 180 | break; |
| 181 | case 30: |
| 182 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 183 | st->codec->codec_id = AV_CODEC_ID_DNXHD; |
| 184 | break; |
| 185 | default: |
| 186 | st->codec->codec_type = AVMEDIA_TYPE_UNKNOWN; |
| 187 | st->codec->codec_id = AV_CODEC_ID_NONE; |
| 188 | break; |
| 189 | } |
| 190 | return s->nb_streams - 1; |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * @brief filters out interesting tags from material information. |
| 195 | * @param len length of tag section, will be adjusted to contain remaining bytes |
| 196 | * @param si struct to store collected information into |
| 197 | */ |
| 198 | static void gxf_material_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) { |
| 199 | si->first_field = AV_NOPTS_VALUE; |
| 200 | si->last_field = AV_NOPTS_VALUE; |
| 201 | while (*len >= 2) { |
| 202 | GXFMatTag tag = avio_r8(pb); |
| 203 | int tlen = avio_r8(pb); |
| 204 | *len -= 2; |
| 205 | if (tlen > *len) |
| 206 | return; |
| 207 | *len -= tlen; |
| 208 | if (tlen == 4) { |
| 209 | uint32_t value = avio_rb32(pb); |
| 210 | if (tag == MAT_FIRST_FIELD) |
| 211 | si->first_field = value; |
| 212 | else if (tag == MAT_LAST_FIELD) |
| 213 | si->last_field = value; |
| 214 | } else |
| 215 | avio_skip(pb, tlen); |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | static const AVRational frame_rate_tab[] = { |
| 220 | { 60, 1}, |
| 221 | {60000, 1001}, |
| 222 | { 50, 1}, |
| 223 | { 30, 1}, |
| 224 | {30000, 1001}, |
| 225 | { 25, 1}, |
| 226 | { 24, 1}, |
| 227 | {24000, 1001}, |
| 228 | { 0, 0}, |
| 229 | }; |
| 230 | |
| 231 | /** |
| 232 | * @brief convert fps tag value to AVRational fps |
| 233 | * @param fps fps value from tag |
| 234 | * @return fps as AVRational, or 0 / 0 if unknown |
| 235 | */ |
| 236 | static AVRational fps_tag2avr(int32_t fps) { |
| 237 | if (fps < 1 || fps > 9) fps = 9; |
| 238 | return frame_rate_tab[fps - 1]; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * @brief convert UMF attributes flags to AVRational fps |
| 243 | * @param flags UMF flags to convert |
| 244 | * @return fps as AVRational, or 0 / 0 if unknown |
| 245 | */ |
| 246 | static AVRational fps_umf2avr(uint32_t flags) { |
| 247 | static const AVRational map[] = {{50, 1}, {60000, 1001}, {24, 1}, |
| 248 | {25, 1}, {30000, 1001}}; |
| 249 | int idx = av_log2((flags & 0x7c0) >> 6); |
| 250 | return map[idx]; |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * @brief filters out interesting tags from track information. |
| 255 | * @param len length of tag section, will be adjusted to contain remaining bytes |
| 256 | * @param si struct to store collected information into |
| 257 | */ |
| 258 | static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si) { |
| 259 | si->frames_per_second = (AVRational){0, 0}; |
| 260 | si->fields_per_frame = 0; |
| 261 | si->track_aux_data = 0x80000000; |
| 262 | while (*len >= 2) { |
| 263 | GXFTrackTag tag = avio_r8(pb); |
| 264 | int tlen = avio_r8(pb); |
| 265 | *len -= 2; |
| 266 | if (tlen > *len) |
| 267 | return; |
| 268 | *len -= tlen; |
| 269 | if (tlen == 4) { |
| 270 | uint32_t value = avio_rb32(pb); |
| 271 | if (tag == TRACK_FPS) |
| 272 | si->frames_per_second = fps_tag2avr(value); |
| 273 | else if (tag == TRACK_FPF && (value == 1 || value == 2)) |
| 274 | si->fields_per_frame = value; |
| 275 | } else if (tlen == 8 && tag == TRACK_AUX) |
| 276 | si->track_aux_data = avio_rl64(pb); |
| 277 | else |
| 278 | avio_skip(pb, tlen); |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | /** |
| 283 | * @brief read index from FLT packet into stream 0 av_index |
| 284 | */ |
| 285 | static void gxf_read_index(AVFormatContext *s, int pkt_len) { |
| 286 | AVIOContext *pb = s->pb; |
| 287 | AVStream *st; |
| 288 | uint32_t fields_per_map = avio_rl32(pb); |
| 289 | uint32_t map_cnt = avio_rl32(pb); |
| 290 | int i; |
| 291 | pkt_len -= 8; |
| 292 | if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) { |
| 293 | avio_skip(pb, pkt_len); |
| 294 | return; |
| 295 | } |
| 296 | st = s->streams[0]; |
| 297 | if (map_cnt > 1000) { |
| 298 | av_log(s, AV_LOG_ERROR, |
| 299 | "too many index entries %"PRIu32" (%"PRIx32")\n", |
| 300 | map_cnt, map_cnt); |
| 301 | map_cnt = 1000; |
| 302 | } |
| 303 | if (pkt_len < 4 * map_cnt) { |
| 304 | av_log(s, AV_LOG_ERROR, "invalid index length\n"); |
| 305 | avio_skip(pb, pkt_len); |
| 306 | return; |
| 307 | } |
| 308 | pkt_len -= 4 * map_cnt; |
| 309 | av_add_index_entry(st, 0, 0, 0, 0, 0); |
| 310 | for (i = 0; i < map_cnt; i++) |
| 311 | av_add_index_entry(st, (uint64_t)avio_rl32(pb) * 1024, |
| 312 | i * (uint64_t)fields_per_map + 1, 0, 0, 0); |
| 313 | avio_skip(pb, pkt_len); |
| 314 | } |
| 315 | |
| 316 | static int gxf_header(AVFormatContext *s) { |
| 317 | AVIOContext *pb = s->pb; |
| 318 | GXFPktType pkt_type; |
| 319 | int map_len; |
| 320 | int len; |
| 321 | AVRational main_timebase = {0, 0}; |
| 322 | struct gxf_stream_info *si = s->priv_data; |
| 323 | int i; |
| 324 | if (!parse_packet_header(pb, &pkt_type, &map_len) || pkt_type != PKT_MAP) { |
| 325 | av_log(s, AV_LOG_ERROR, "map packet not found\n"); |
| 326 | return 0; |
| 327 | } |
| 328 | map_len -= 2; |
| 329 | if (avio_r8(pb) != 0x0e0 || avio_r8(pb) != 0xff) { |
| 330 | av_log(s, AV_LOG_ERROR, "unknown version or invalid map preamble\n"); |
| 331 | return 0; |
| 332 | } |
| 333 | map_len -= 2; |
| 334 | len = avio_rb16(pb); // length of material data section |
| 335 | if (len > map_len) { |
| 336 | av_log(s, AV_LOG_ERROR, "material data longer than map data\n"); |
| 337 | return 0; |
| 338 | } |
| 339 | map_len -= len; |
| 340 | gxf_material_tags(pb, &len, si); |
| 341 | avio_skip(pb, len); |
| 342 | map_len -= 2; |
| 343 | len = avio_rb16(pb); // length of track description |
| 344 | if (len > map_len) { |
| 345 | av_log(s, AV_LOG_ERROR, "track description longer than map data\n"); |
| 346 | return 0; |
| 347 | } |
| 348 | map_len -= len; |
| 349 | while (len > 0) { |
| 350 | int track_type, track_id, track_len; |
| 351 | AVStream *st; |
| 352 | int idx; |
| 353 | len -= 4; |
| 354 | track_type = avio_r8(pb); |
| 355 | track_id = avio_r8(pb); |
| 356 | track_len = avio_rb16(pb); |
| 357 | len -= track_len; |
| 358 | if (!(track_type & 0x80)) { |
| 359 | av_log(s, AV_LOG_ERROR, "invalid track type %x\n", track_type); |
| 360 | continue; |
| 361 | } |
| 362 | track_type &= 0x7f; |
| 363 | if ((track_id & 0xc0) != 0xc0) { |
| 364 | av_log(s, AV_LOG_ERROR, "invalid track id %x\n", track_id); |
| 365 | continue; |
| 366 | } |
| 367 | track_id &= 0x3f; |
| 368 | gxf_track_tags(pb, &track_len, si); |
| 369 | // check for timecode tracks |
| 370 | if (track_type == 7 || track_type == 8 || track_type == 24) { |
| 371 | add_timecode_metadata(&s->metadata, "timecode", |
| 372 | si->track_aux_data & 0xffffffff, |
| 373 | si->fields_per_frame); |
| 374 | |
| 375 | } |
| 376 | avio_skip(pb, track_len); |
| 377 | |
| 378 | idx = get_sindex(s, track_id, track_type); |
| 379 | if (idx < 0) continue; |
| 380 | st = s->streams[idx]; |
| 381 | if (!main_timebase.num || !main_timebase.den) { |
| 382 | main_timebase.num = si->frames_per_second.den; |
| 383 | main_timebase.den = si->frames_per_second.num * 2; |
| 384 | } |
| 385 | st->start_time = si->first_field; |
| 386 | if (si->first_field != AV_NOPTS_VALUE && si->last_field != AV_NOPTS_VALUE) |
| 387 | st->duration = si->last_field - si->first_field; |
| 388 | } |
| 389 | if (len < 0) |
| 390 | av_log(s, AV_LOG_ERROR, "invalid track description length specified\n"); |
| 391 | if (map_len) |
| 392 | avio_skip(pb, map_len); |
| 393 | if (!parse_packet_header(pb, &pkt_type, &len)) { |
| 394 | av_log(s, AV_LOG_ERROR, "sync lost in header\n"); |
| 395 | return -1; |
| 396 | } |
| 397 | if (pkt_type == PKT_FLT) { |
| 398 | gxf_read_index(s, len); |
| 399 | if (!parse_packet_header(pb, &pkt_type, &len)) { |
| 400 | av_log(s, AV_LOG_ERROR, "sync lost in header\n"); |
| 401 | return -1; |
| 402 | } |
| 403 | } |
| 404 | if (pkt_type == PKT_UMF) { |
| 405 | if (len >= 0x39) { |
| 406 | AVRational fps; |
| 407 | len -= 0x39; |
| 408 | avio_skip(pb, 5); // preamble |
| 409 | avio_skip(pb, 0x30); // payload description |
| 410 | fps = fps_umf2avr(avio_rl32(pb)); |
| 411 | if (!main_timebase.num || !main_timebase.den) { |
| 412 | av_log(s, AV_LOG_WARNING, "No FPS track tag, using UMF fps tag." |
| 413 | " This might give wrong results.\n"); |
| 414 | // this may not always be correct, but simply the best we can get |
| 415 | main_timebase.num = fps.den; |
| 416 | main_timebase.den = fps.num * 2; |
| 417 | } |
| 418 | |
| 419 | if (len >= 0x18) { |
| 420 | len -= 0x18; |
| 421 | avio_skip(pb, 0x10); |
| 422 | add_timecode_metadata(&s->metadata, "timecode_at_mark_in", |
| 423 | avio_rl32(pb), si->fields_per_frame); |
| 424 | add_timecode_metadata(&s->metadata, "timecode_at_mark_out", |
| 425 | avio_rl32(pb), si->fields_per_frame); |
| 426 | } |
| 427 | } else |
| 428 | av_log(s, AV_LOG_INFO, "UMF packet too short\n"); |
| 429 | } else |
| 430 | av_log(s, AV_LOG_INFO, "UMF packet missing\n"); |
| 431 | avio_skip(pb, len); |
| 432 | // set a fallback value, 60000/1001 is specified for audio-only files |
| 433 | // so use that regardless of why we do not know the video frame rate. |
| 434 | if (!main_timebase.num || !main_timebase.den) |
| 435 | main_timebase = (AVRational){1001, 60000}; |
| 436 | for (i = 0; i < s->nb_streams; i++) { |
| 437 | AVStream *st = s->streams[i]; |
| 438 | avpriv_set_pts_info(st, 32, main_timebase.num, main_timebase.den); |
| 439 | } |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | #define READ_ONE() \ |
| 444 | { \ |
| 445 | if (!max_interval-- || avio_feof(pb)) \ |
| 446 | goto out; \ |
| 447 | tmp = tmp << 8 | avio_r8(pb); \ |
| 448 | } |
| 449 | |
| 450 | /** |
| 451 | * @brief resync the stream on the next media packet with specified properties |
| 452 | * @param max_interval how many bytes to search for matching packet at most |
| 453 | * @param track track id the media packet must belong to, -1 for any |
| 454 | * @param timestamp minimum timestamp (== field number) the packet must have, -1 for any |
| 455 | * @return timestamp of packet found |
| 456 | */ |
| 457 | static int64_t gxf_resync_media(AVFormatContext *s, uint64_t max_interval, int track, int timestamp) { |
| 458 | uint32_t tmp; |
| 459 | uint64_t last_pos; |
| 460 | uint64_t last_found_pos = 0; |
| 461 | int cur_track; |
| 462 | int64_t cur_timestamp = AV_NOPTS_VALUE; |
| 463 | int len; |
| 464 | AVIOContext *pb = s->pb; |
| 465 | GXFPktType type; |
| 466 | tmp = avio_rb32(pb); |
| 467 | start: |
| 468 | while (tmp) |
| 469 | READ_ONE(); |
| 470 | READ_ONE(); |
| 471 | if (tmp != 1) |
| 472 | goto start; |
| 473 | last_pos = avio_tell(pb); |
| 474 | if (avio_seek(pb, -5, SEEK_CUR) < 0) |
| 475 | goto out; |
| 476 | if (!parse_packet_header(pb, &type, &len) || type != PKT_MEDIA) { |
| 477 | if (avio_seek(pb, last_pos, SEEK_SET) < 0) |
| 478 | goto out; |
| 479 | goto start; |
| 480 | } |
| 481 | avio_r8(pb); |
| 482 | cur_track = avio_r8(pb); |
| 483 | cur_timestamp = avio_rb32(pb); |
| 484 | last_found_pos = avio_tell(pb) - 16 - 6; |
| 485 | if ((track >= 0 && track != cur_track) || (timestamp >= 0 && timestamp > cur_timestamp)) { |
| 486 | if (avio_seek(pb, last_pos, SEEK_SET) >= 0) |
| 487 | goto start; |
| 488 | } |
| 489 | out: |
| 490 | if (last_found_pos) |
| 491 | avio_seek(pb, last_found_pos, SEEK_SET); |
| 492 | return cur_timestamp; |
| 493 | } |
| 494 | |
| 495 | static int gxf_packet(AVFormatContext *s, AVPacket *pkt) { |
| 496 | AVIOContext *pb = s->pb; |
| 497 | GXFPktType pkt_type; |
| 498 | int pkt_len; |
| 499 | struct gxf_stream_info *si = s->priv_data; |
| 500 | |
| 501 | while (!pb->eof_reached) { |
| 502 | AVStream *st; |
| 503 | int track_type, track_id, ret; |
| 504 | int field_nr, field_info, skip = 0; |
| 505 | int stream_index; |
| 506 | if (!parse_packet_header(pb, &pkt_type, &pkt_len)) { |
| 507 | if (!avio_feof(pb)) |
| 508 | av_log(s, AV_LOG_ERROR, "sync lost\n"); |
| 509 | return -1; |
| 510 | } |
| 511 | if (pkt_type == PKT_FLT) { |
| 512 | gxf_read_index(s, pkt_len); |
| 513 | continue; |
| 514 | } |
| 515 | if (pkt_type != PKT_MEDIA) { |
| 516 | avio_skip(pb, pkt_len); |
| 517 | continue; |
| 518 | } |
| 519 | if (pkt_len < 16) { |
| 520 | av_log(s, AV_LOG_ERROR, "invalid media packet length\n"); |
| 521 | continue; |
| 522 | } |
| 523 | pkt_len -= 16; |
| 524 | track_type = avio_r8(pb); |
| 525 | track_id = avio_r8(pb); |
| 526 | stream_index = get_sindex(s, track_id, track_type); |
| 527 | if (stream_index < 0) |
| 528 | return stream_index; |
| 529 | st = s->streams[stream_index]; |
| 530 | field_nr = avio_rb32(pb); |
| 531 | field_info = avio_rb32(pb); |
| 532 | avio_rb32(pb); // "timeline" field number |
| 533 | avio_r8(pb); // flags |
| 534 | avio_r8(pb); // reserved |
| 535 | if (st->codec->codec_id == AV_CODEC_ID_PCM_S24LE || |
| 536 | st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) { |
| 537 | int first = field_info >> 16; |
| 538 | int last = field_info & 0xffff; // last is exclusive |
| 539 | int bps = av_get_bits_per_sample(st->codec->codec_id)>>3; |
| 540 | if (first <= last && last*bps <= pkt_len) { |
| 541 | avio_skip(pb, first*bps); |
| 542 | skip = pkt_len - last*bps; |
| 543 | pkt_len = (last-first)*bps; |
| 544 | } else |
| 545 | av_log(s, AV_LOG_ERROR, "invalid first and last sample values\n"); |
| 546 | } |
| 547 | ret = av_get_packet(pb, pkt, pkt_len); |
| 548 | if (skip) |
| 549 | avio_skip(pb, skip); |
| 550 | pkt->stream_index = stream_index; |
| 551 | pkt->dts = field_nr; |
| 552 | |
| 553 | //set duration manually for DV or else lavf misdetects the frame rate |
| 554 | if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) |
| 555 | pkt->duration = si->fields_per_frame; |
| 556 | |
| 557 | return ret; |
| 558 | } |
| 559 | return AVERROR_EOF; |
| 560 | } |
| 561 | |
| 562 | static int gxf_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { |
| 563 | int res = 0; |
| 564 | uint64_t pos; |
| 565 | uint64_t maxlen = 100 * 1024 * 1024; |
| 566 | AVStream *st = s->streams[0]; |
| 567 | int64_t start_time = s->streams[stream_index]->start_time; |
| 568 | int64_t found; |
| 569 | int idx; |
| 570 | if (timestamp < start_time) timestamp = start_time; |
| 571 | idx = av_index_search_timestamp(st, timestamp - start_time, |
| 572 | AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD); |
| 573 | if (idx < 0) |
| 574 | return -1; |
| 575 | pos = st->index_entries[idx].pos; |
| 576 | if (idx < st->nb_index_entries - 2) |
| 577 | maxlen = st->index_entries[idx + 2].pos - pos; |
| 578 | maxlen = FFMAX(maxlen, 200 * 1024); |
| 579 | res = avio_seek(s->pb, pos, SEEK_SET); |
| 580 | if (res < 0) |
| 581 | return res; |
| 582 | found = gxf_resync_media(s, maxlen, -1, timestamp); |
| 583 | if (FFABS(found - timestamp) > 4) |
| 584 | return -1; |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | static int64_t gxf_read_timestamp(AVFormatContext *s, int stream_index, |
| 589 | int64_t *pos, int64_t pos_limit) { |
| 590 | AVIOContext *pb = s->pb; |
| 591 | int64_t res; |
| 592 | if (avio_seek(pb, *pos, SEEK_SET) < 0) |
| 593 | return AV_NOPTS_VALUE; |
| 594 | res = gxf_resync_media(s, pos_limit - *pos, -1, -1); |
| 595 | *pos = avio_tell(pb); |
| 596 | return res; |
| 597 | } |
| 598 | |
| 599 | AVInputFormat ff_gxf_demuxer = { |
| 600 | .name = "gxf", |
| 601 | .long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"), |
| 602 | .priv_data_size = sizeof(struct gxf_stream_info), |
| 603 | .read_probe = gxf_probe, |
| 604 | .read_header = gxf_header, |
| 605 | .read_packet = gxf_packet, |
| 606 | .read_seek = gxf_seek, |
| 607 | .read_timestamp = gxf_read_timestamp, |
| 608 | }; |