| 1 | /* |
| 2 | * FFM (ffserver live feed) demuxer |
| 3 | * Copyright (c) 2001 Fabrice Bellard |
| 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 <stdint.h> |
| 23 | |
| 24 | #include "libavutil/intreadwrite.h" |
| 25 | #include "libavutil/intfloat.h" |
| 26 | #include "libavutil/opt.h" |
| 27 | #include "libavutil/avassert.h" |
| 28 | #include "libavutil/avstring.h" |
| 29 | #include "avformat.h" |
| 30 | #include "internal.h" |
| 31 | #include "ffm.h" |
| 32 | #include "avio_internal.h" |
| 33 | |
| 34 | static int ffm_is_avail_data(AVFormatContext *s, int size) |
| 35 | { |
| 36 | FFMContext *ffm = s->priv_data; |
| 37 | int64_t pos, avail_size; |
| 38 | int len; |
| 39 | |
| 40 | len = ffm->packet_end - ffm->packet_ptr; |
| 41 | if (size <= len) |
| 42 | return 1; |
| 43 | pos = avio_tell(s->pb); |
| 44 | if (!ffm->write_index) { |
| 45 | if (pos == ffm->file_size) |
| 46 | return AVERROR_EOF; |
| 47 | avail_size = ffm->file_size - pos; |
| 48 | } else { |
| 49 | if (pos == ffm->write_index) { |
| 50 | /* exactly at the end of stream */ |
| 51 | return AVERROR(EAGAIN); |
| 52 | } else if (pos < ffm->write_index) { |
| 53 | avail_size = ffm->write_index - pos; |
| 54 | } else { |
| 55 | avail_size = (ffm->file_size - pos) + (ffm->write_index - FFM_PACKET_SIZE); |
| 56 | } |
| 57 | } |
| 58 | avail_size = (avail_size / ffm->packet_size) * (ffm->packet_size - FFM_HEADER_SIZE) + len; |
| 59 | if (size <= avail_size) |
| 60 | return 1; |
| 61 | else |
| 62 | return AVERROR(EAGAIN); |
| 63 | } |
| 64 | |
| 65 | static int ffm_resync(AVFormatContext *s, int state) |
| 66 | { |
| 67 | av_log(s, AV_LOG_ERROR, "resyncing\n"); |
| 68 | while (state != PACKET_ID) { |
| 69 | if (avio_feof(s->pb)) { |
| 70 | av_log(s, AV_LOG_ERROR, "cannot find FFM syncword\n"); |
| 71 | return -1; |
| 72 | } |
| 73 | state = (state << 8) | avio_r8(s->pb); |
| 74 | } |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | /* first is true if we read the frame header */ |
| 79 | static int ffm_read_data(AVFormatContext *s, |
| 80 | uint8_t *buf, int size, int header) |
| 81 | { |
| 82 | FFMContext *ffm = s->priv_data; |
| 83 | AVIOContext *pb = s->pb; |
| 84 | int len, fill_size, size1, frame_offset, id; |
| 85 | |
| 86 | size1 = size; |
| 87 | while (size > 0) { |
| 88 | redo: |
| 89 | len = ffm->packet_end - ffm->packet_ptr; |
| 90 | if (len < 0) |
| 91 | return -1; |
| 92 | if (len > size) |
| 93 | len = size; |
| 94 | if (len == 0) { |
| 95 | if (avio_tell(pb) == ffm->file_size) |
| 96 | avio_seek(pb, ffm->packet_size, SEEK_SET); |
| 97 | retry_read: |
| 98 | if (pb->buffer_size != ffm->packet_size) { |
| 99 | int64_t tell = avio_tell(pb); |
| 100 | ffio_set_buf_size(pb, ffm->packet_size); |
| 101 | avio_seek(pb, tell, SEEK_SET); |
| 102 | } |
| 103 | id = avio_rb16(pb); /* PACKET_ID */ |
| 104 | if (id != PACKET_ID) |
| 105 | if (ffm_resync(s, id) < 0) |
| 106 | return -1; |
| 107 | fill_size = avio_rb16(pb); |
| 108 | ffm->dts = avio_rb64(pb); |
| 109 | frame_offset = avio_rb16(pb); |
| 110 | avio_read(pb, ffm->packet, ffm->packet_size - FFM_HEADER_SIZE); |
| 111 | ffm->packet_end = ffm->packet + (ffm->packet_size - FFM_HEADER_SIZE - fill_size); |
| 112 | if (ffm->packet_end < ffm->packet || frame_offset < 0) |
| 113 | return -1; |
| 114 | /* if first packet or resynchronization packet, we must |
| 115 | handle it specifically */ |
| 116 | if (ffm->first_packet || (frame_offset & 0x8000)) { |
| 117 | if (!frame_offset) { |
| 118 | /* This packet has no frame headers in it */ |
| 119 | if (avio_tell(pb) >= ffm->packet_size * 3LL) { |
| 120 | avio_seek(pb, -ffm->packet_size * 2LL, SEEK_CUR); |
| 121 | goto retry_read; |
| 122 | } |
| 123 | /* This is bad, we cannot find a valid frame header */ |
| 124 | return 0; |
| 125 | } |
| 126 | ffm->first_packet = 0; |
| 127 | if ((frame_offset & 0x7fff) < FFM_HEADER_SIZE) |
| 128 | return -1; |
| 129 | ffm->packet_ptr = ffm->packet + (frame_offset & 0x7fff) - FFM_HEADER_SIZE; |
| 130 | if (!header) |
| 131 | break; |
| 132 | } else { |
| 133 | ffm->packet_ptr = ffm->packet; |
| 134 | } |
| 135 | goto redo; |
| 136 | } |
| 137 | memcpy(buf, ffm->packet_ptr, len); |
| 138 | buf += len; |
| 139 | ffm->packet_ptr += len; |
| 140 | size -= len; |
| 141 | header = 0; |
| 142 | } |
| 143 | return size1 - size; |
| 144 | } |
| 145 | |
| 146 | /* ensure that acutal seeking happens between FFM_PACKET_SIZE |
| 147 | and file_size - FFM_PACKET_SIZE */ |
| 148 | static int64_t ffm_seek1(AVFormatContext *s, int64_t pos1) |
| 149 | { |
| 150 | FFMContext *ffm = s->priv_data; |
| 151 | AVIOContext *pb = s->pb; |
| 152 | int64_t pos; |
| 153 | |
| 154 | pos = FFMIN(pos1, ffm->file_size - FFM_PACKET_SIZE); |
| 155 | pos = FFMAX(pos, FFM_PACKET_SIZE); |
| 156 | av_dlog(s, "seek to %"PRIx64" -> %"PRIx64"\n", pos1, pos); |
| 157 | return avio_seek(pb, pos, SEEK_SET); |
| 158 | } |
| 159 | |
| 160 | static int64_t get_dts(AVFormatContext *s, int64_t pos) |
| 161 | { |
| 162 | AVIOContext *pb = s->pb; |
| 163 | int64_t dts; |
| 164 | |
| 165 | ffm_seek1(s, pos); |
| 166 | avio_skip(pb, 4); |
| 167 | dts = avio_rb64(pb); |
| 168 | av_dlog(s, "dts=%0.6f\n", dts / 1000000.0); |
| 169 | return dts; |
| 170 | } |
| 171 | |
| 172 | static void adjust_write_index(AVFormatContext *s) |
| 173 | { |
| 174 | FFMContext *ffm = s->priv_data; |
| 175 | AVIOContext *pb = s->pb; |
| 176 | int64_t pts; |
| 177 | //int64_t orig_write_index = ffm->write_index; |
| 178 | int64_t pos_min, pos_max; |
| 179 | int64_t pts_start; |
| 180 | int64_t ptr = avio_tell(pb); |
| 181 | |
| 182 | |
| 183 | pos_min = 0; |
| 184 | pos_max = ffm->file_size - 2 * FFM_PACKET_SIZE; |
| 185 | |
| 186 | pts_start = get_dts(s, pos_min); |
| 187 | |
| 188 | pts = get_dts(s, pos_max); |
| 189 | |
| 190 | if (pts - 100000 > pts_start) |
| 191 | goto end; |
| 192 | |
| 193 | ffm->write_index = FFM_PACKET_SIZE; |
| 194 | |
| 195 | pts_start = get_dts(s, pos_min); |
| 196 | |
| 197 | pts = get_dts(s, pos_max); |
| 198 | |
| 199 | if (pts - 100000 <= pts_start) { |
| 200 | while (1) { |
| 201 | int64_t newpos; |
| 202 | int64_t newpts; |
| 203 | |
| 204 | newpos = ((pos_max + pos_min) / (2 * FFM_PACKET_SIZE)) * FFM_PACKET_SIZE; |
| 205 | |
| 206 | if (newpos == pos_min) |
| 207 | break; |
| 208 | |
| 209 | newpts = get_dts(s, newpos); |
| 210 | |
| 211 | if (newpts - 100000 <= pts) { |
| 212 | pos_max = newpos; |
| 213 | pts = newpts; |
| 214 | } else { |
| 215 | pos_min = newpos; |
| 216 | } |
| 217 | } |
| 218 | ffm->write_index += pos_max; |
| 219 | } |
| 220 | |
| 221 | end: |
| 222 | avio_seek(pb, ptr, SEEK_SET); |
| 223 | } |
| 224 | |
| 225 | |
| 226 | static int ffm_close(AVFormatContext *s) |
| 227 | { |
| 228 | int i; |
| 229 | |
| 230 | for (i = 0; i < s->nb_streams; i++) |
| 231 | av_freep(&s->streams[i]->codec->rc_eq); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | static int ffm_append_recommended_configuration(AVStream *st, char **conf) |
| 237 | { |
| 238 | int ret; |
| 239 | size_t newsize; |
| 240 | av_assert0(conf && st); |
| 241 | if (!*conf) |
| 242 | return 0; |
| 243 | if (!st->recommended_encoder_configuration) { |
| 244 | st->recommended_encoder_configuration = *conf; |
| 245 | *conf = 0; |
| 246 | return 0; |
| 247 | } |
| 248 | newsize = strlen(*conf) + strlen(st->recommended_encoder_configuration) + 2; |
| 249 | if ((ret = av_reallocp(&st->recommended_encoder_configuration, newsize)) < 0) |
| 250 | return ret; |
| 251 | av_strlcat(st->recommended_encoder_configuration, ",", newsize); |
| 252 | av_strlcat(st->recommended_encoder_configuration, *conf, newsize); |
| 253 | av_freep(conf); |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static int ffm2_read_header(AVFormatContext *s) |
| 258 | { |
| 259 | FFMContext *ffm = s->priv_data; |
| 260 | AVStream *st; |
| 261 | AVIOContext *pb = s->pb; |
| 262 | AVCodecContext *codec; |
| 263 | int ret; |
| 264 | int f_main = 0, f_cprv, f_stvi, f_stau; |
| 265 | AVCodec *enc; |
| 266 | char *buffer; |
| 267 | |
| 268 | ffm->packet_size = avio_rb32(pb); |
| 269 | if (ffm->packet_size != FFM_PACKET_SIZE) { |
| 270 | av_log(s, AV_LOG_ERROR, "Invalid packet size %d, expected size was %d\n", |
| 271 | ffm->packet_size, FFM_PACKET_SIZE); |
| 272 | ret = AVERROR_INVALIDDATA; |
| 273 | goto fail; |
| 274 | } |
| 275 | |
| 276 | ffm->write_index = avio_rb64(pb); |
| 277 | /* get also filesize */ |
| 278 | if (pb->seekable) { |
| 279 | ffm->file_size = avio_size(pb); |
| 280 | if (ffm->write_index && 0) |
| 281 | adjust_write_index(s); |
| 282 | } else { |
| 283 | ffm->file_size = (UINT64_C(1) << 63) - 1; |
| 284 | } |
| 285 | |
| 286 | while(!avio_feof(pb)) { |
| 287 | unsigned id = avio_rb32(pb); |
| 288 | unsigned size = avio_rb32(pb); |
| 289 | int64_t next = avio_tell(pb) + size; |
| 290 | char rc_eq_buf[128]; |
| 291 | |
| 292 | if(!id) |
| 293 | break; |
| 294 | |
| 295 | switch(id) { |
| 296 | case MKBETAG('M', 'A', 'I', 'N'): |
| 297 | if (f_main++) { |
| 298 | ret = AVERROR(EINVAL); |
| 299 | goto fail; |
| 300 | } |
| 301 | avio_rb32(pb); /* nb_streams */ |
| 302 | avio_rb32(pb); /* total bitrate */ |
| 303 | break; |
| 304 | case MKBETAG('C', 'O', 'M', 'M'): |
| 305 | f_cprv = f_stvi = f_stau = 0; |
| 306 | st = avformat_new_stream(s, NULL); |
| 307 | if (!st) { |
| 308 | ret = AVERROR(ENOMEM); |
| 309 | goto fail; |
| 310 | } |
| 311 | |
| 312 | avpriv_set_pts_info(st, 64, 1, 1000000); |
| 313 | |
| 314 | codec = st->codec; |
| 315 | /* generic info */ |
| 316 | codec->codec_id = avio_rb32(pb); |
| 317 | codec->codec_type = avio_r8(pb); |
| 318 | codec->bit_rate = avio_rb32(pb); |
| 319 | codec->flags = avio_rb32(pb); |
| 320 | codec->flags2 = avio_rb32(pb); |
| 321 | codec->debug = avio_rb32(pb); |
| 322 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| 323 | if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0) |
| 324 | return AVERROR(ENOMEM); |
| 325 | } |
| 326 | break; |
| 327 | case MKBETAG('S', 'T', 'V', 'I'): |
| 328 | if (f_stvi++) { |
| 329 | ret = AVERROR(EINVAL); |
| 330 | goto fail; |
| 331 | } |
| 332 | codec->time_base.num = avio_rb32(pb); |
| 333 | codec->time_base.den = avio_rb32(pb); |
| 334 | codec->width = avio_rb16(pb); |
| 335 | codec->height = avio_rb16(pb); |
| 336 | codec->gop_size = avio_rb16(pb); |
| 337 | codec->pix_fmt = avio_rb32(pb); |
| 338 | codec->qmin = avio_r8(pb); |
| 339 | codec->qmax = avio_r8(pb); |
| 340 | codec->max_qdiff = avio_r8(pb); |
| 341 | codec->qcompress = avio_rb16(pb) / 10000.0; |
| 342 | codec->qblur = avio_rb16(pb) / 10000.0; |
| 343 | codec->bit_rate_tolerance = avio_rb32(pb); |
| 344 | avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); |
| 345 | codec->rc_eq = av_strdup(rc_eq_buf); |
| 346 | codec->rc_max_rate = avio_rb32(pb); |
| 347 | codec->rc_min_rate = avio_rb32(pb); |
| 348 | codec->rc_buffer_size = avio_rb32(pb); |
| 349 | codec->i_quant_factor = av_int2double(avio_rb64(pb)); |
| 350 | codec->b_quant_factor = av_int2double(avio_rb64(pb)); |
| 351 | codec->i_quant_offset = av_int2double(avio_rb64(pb)); |
| 352 | codec->b_quant_offset = av_int2double(avio_rb64(pb)); |
| 353 | codec->dct_algo = avio_rb32(pb); |
| 354 | codec->strict_std_compliance = avio_rb32(pb); |
| 355 | codec->max_b_frames = avio_rb32(pb); |
| 356 | codec->mpeg_quant = avio_rb32(pb); |
| 357 | codec->intra_dc_precision = avio_rb32(pb); |
| 358 | codec->me_method = avio_rb32(pb); |
| 359 | codec->mb_decision = avio_rb32(pb); |
| 360 | codec->nsse_weight = avio_rb32(pb); |
| 361 | codec->frame_skip_cmp = avio_rb32(pb); |
| 362 | codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); |
| 363 | codec->codec_tag = avio_rb32(pb); |
| 364 | codec->thread_count = avio_r8(pb); |
| 365 | codec->coder_type = avio_rb32(pb); |
| 366 | codec->me_cmp = avio_rb32(pb); |
| 367 | codec->me_subpel_quality = avio_rb32(pb); |
| 368 | codec->me_range = avio_rb32(pb); |
| 369 | codec->keyint_min = avio_rb32(pb); |
| 370 | codec->scenechange_threshold = avio_rb32(pb); |
| 371 | codec->b_frame_strategy = avio_rb32(pb); |
| 372 | codec->qcompress = av_int2double(avio_rb64(pb)); |
| 373 | codec->qblur = av_int2double(avio_rb64(pb)); |
| 374 | codec->max_qdiff = avio_rb32(pb); |
| 375 | codec->refs = avio_rb32(pb); |
| 376 | break; |
| 377 | case MKBETAG('S', 'T', 'A', 'U'): |
| 378 | if (f_stau++) { |
| 379 | ret = AVERROR(EINVAL); |
| 380 | goto fail; |
| 381 | } |
| 382 | codec->sample_rate = avio_rb32(pb); |
| 383 | codec->channels = avio_rl16(pb); |
| 384 | codec->frame_size = avio_rl16(pb); |
| 385 | break; |
| 386 | case MKBETAG('C', 'P', 'R', 'V'): |
| 387 | if (f_cprv++) { |
| 388 | ret = AVERROR(EINVAL); |
| 389 | goto fail; |
| 390 | } |
| 391 | enc = avcodec_find_encoder(codec->codec_id); |
| 392 | if (enc && enc->priv_data_size && enc->priv_class) { |
| 393 | buffer = av_malloc(size + 1); |
| 394 | if (!buffer) { |
| 395 | ret = AVERROR(ENOMEM); |
| 396 | goto fail; |
| 397 | } |
| 398 | avio_get_str(pb, size, buffer, size + 1); |
| 399 | if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0) |
| 400 | goto fail; |
| 401 | } |
| 402 | break; |
| 403 | case MKBETAG('S', '2', 'V', 'I'): |
| 404 | if (f_stvi++) { |
| 405 | ret = AVERROR(EINVAL); |
| 406 | goto fail; |
| 407 | } |
| 408 | buffer = av_malloc(size); |
| 409 | if (!buffer) { |
| 410 | ret = AVERROR(ENOMEM); |
| 411 | goto fail; |
| 412 | } |
| 413 | avio_get_str(pb, INT_MAX, buffer, size); |
| 414 | av_set_options_string(codec, buffer, "=", ","); |
| 415 | if ((ret = ffm_append_recommended_configuration(st, &buffer)) < 0) |
| 416 | goto fail; |
| 417 | break; |
| 418 | case MKBETAG('S', '2', 'A', 'U'): |
| 419 | if (f_stau++) { |
| 420 | ret = AVERROR(EINVAL); |
| 421 | goto fail; |
| 422 | } |
| 423 | buffer = av_malloc(size); |
| 424 | if (!buffer) { |
| 425 | ret = AVERROR(ENOMEM); |
| 426 | goto fail; |
| 427 | } |
| 428 | avio_get_str(pb, INT_MAX, buffer, size); |
| 429 | av_set_options_string(codec, buffer, "=", ","); |
| 430 | ffm_append_recommended_configuration(st, &buffer); |
| 431 | break; |
| 432 | } |
| 433 | avio_seek(pb, next, SEEK_SET); |
| 434 | } |
| 435 | |
| 436 | /* get until end of block reached */ |
| 437 | while ((avio_tell(pb) % ffm->packet_size) != 0) |
| 438 | avio_r8(pb); |
| 439 | |
| 440 | /* init packet demux */ |
| 441 | ffm->packet_ptr = ffm->packet; |
| 442 | ffm->packet_end = ffm->packet; |
| 443 | ffm->frame_offset = 0; |
| 444 | ffm->dts = 0; |
| 445 | ffm->read_state = READ_HEADER; |
| 446 | ffm->first_packet = 1; |
| 447 | return 0; |
| 448 | fail: |
| 449 | ffm_close(s); |
| 450 | return ret; |
| 451 | } |
| 452 | |
| 453 | static int ffm_read_header(AVFormatContext *s) |
| 454 | { |
| 455 | FFMContext *ffm = s->priv_data; |
| 456 | AVStream *st; |
| 457 | AVIOContext *pb = s->pb; |
| 458 | AVCodecContext *codec; |
| 459 | int i, nb_streams; |
| 460 | uint32_t tag; |
| 461 | |
| 462 | /* header */ |
| 463 | tag = avio_rl32(pb); |
| 464 | if (tag == MKTAG('F', 'F', 'M', '2')) |
| 465 | return ffm2_read_header(s); |
| 466 | if (tag != MKTAG('F', 'F', 'M', '1')) |
| 467 | goto fail; |
| 468 | ffm->packet_size = avio_rb32(pb); |
| 469 | if (ffm->packet_size != FFM_PACKET_SIZE) |
| 470 | goto fail; |
| 471 | ffm->write_index = avio_rb64(pb); |
| 472 | /* get also filesize */ |
| 473 | if (pb->seekable) { |
| 474 | ffm->file_size = avio_size(pb); |
| 475 | if (ffm->write_index && 0) |
| 476 | adjust_write_index(s); |
| 477 | } else { |
| 478 | ffm->file_size = (UINT64_C(1) << 63) - 1; |
| 479 | } |
| 480 | |
| 481 | nb_streams = avio_rb32(pb); |
| 482 | avio_rb32(pb); /* total bitrate */ |
| 483 | /* read each stream */ |
| 484 | for(i=0;i<nb_streams;i++) { |
| 485 | char rc_eq_buf[128]; |
| 486 | |
| 487 | st = avformat_new_stream(s, NULL); |
| 488 | if (!st) |
| 489 | goto fail; |
| 490 | |
| 491 | avpriv_set_pts_info(st, 64, 1, 1000000); |
| 492 | |
| 493 | codec = st->codec; |
| 494 | /* generic info */ |
| 495 | codec->codec_id = avio_rb32(pb); |
| 496 | codec->codec_type = avio_r8(pb); /* codec_type */ |
| 497 | codec->bit_rate = avio_rb32(pb); |
| 498 | codec->flags = avio_rb32(pb); |
| 499 | codec->flags2 = avio_rb32(pb); |
| 500 | codec->debug = avio_rb32(pb); |
| 501 | /* specific info */ |
| 502 | switch(codec->codec_type) { |
| 503 | case AVMEDIA_TYPE_VIDEO: |
| 504 | codec->time_base.num = avio_rb32(pb); |
| 505 | codec->time_base.den = avio_rb32(pb); |
| 506 | codec->width = avio_rb16(pb); |
| 507 | codec->height = avio_rb16(pb); |
| 508 | codec->gop_size = avio_rb16(pb); |
| 509 | codec->pix_fmt = avio_rb32(pb); |
| 510 | codec->qmin = avio_r8(pb); |
| 511 | codec->qmax = avio_r8(pb); |
| 512 | codec->max_qdiff = avio_r8(pb); |
| 513 | codec->qcompress = avio_rb16(pb) / 10000.0; |
| 514 | codec->qblur = avio_rb16(pb) / 10000.0; |
| 515 | codec->bit_rate_tolerance = avio_rb32(pb); |
| 516 | avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); |
| 517 | codec->rc_eq = av_strdup(rc_eq_buf); |
| 518 | codec->rc_max_rate = avio_rb32(pb); |
| 519 | codec->rc_min_rate = avio_rb32(pb); |
| 520 | codec->rc_buffer_size = avio_rb32(pb); |
| 521 | codec->i_quant_factor = av_int2double(avio_rb64(pb)); |
| 522 | codec->b_quant_factor = av_int2double(avio_rb64(pb)); |
| 523 | codec->i_quant_offset = av_int2double(avio_rb64(pb)); |
| 524 | codec->b_quant_offset = av_int2double(avio_rb64(pb)); |
| 525 | codec->dct_algo = avio_rb32(pb); |
| 526 | codec->strict_std_compliance = avio_rb32(pb); |
| 527 | codec->max_b_frames = avio_rb32(pb); |
| 528 | codec->mpeg_quant = avio_rb32(pb); |
| 529 | codec->intra_dc_precision = avio_rb32(pb); |
| 530 | codec->me_method = avio_rb32(pb); |
| 531 | codec->mb_decision = avio_rb32(pb); |
| 532 | codec->nsse_weight = avio_rb32(pb); |
| 533 | codec->frame_skip_cmp = avio_rb32(pb); |
| 534 | codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); |
| 535 | codec->codec_tag = avio_rb32(pb); |
| 536 | codec->thread_count = avio_r8(pb); |
| 537 | codec->coder_type = avio_rb32(pb); |
| 538 | codec->me_cmp = avio_rb32(pb); |
| 539 | codec->me_subpel_quality = avio_rb32(pb); |
| 540 | codec->me_range = avio_rb32(pb); |
| 541 | codec->keyint_min = avio_rb32(pb); |
| 542 | codec->scenechange_threshold = avio_rb32(pb); |
| 543 | codec->b_frame_strategy = avio_rb32(pb); |
| 544 | codec->qcompress = av_int2double(avio_rb64(pb)); |
| 545 | codec->qblur = av_int2double(avio_rb64(pb)); |
| 546 | codec->max_qdiff = avio_rb32(pb); |
| 547 | codec->refs = avio_rb32(pb); |
| 548 | break; |
| 549 | case AVMEDIA_TYPE_AUDIO: |
| 550 | codec->sample_rate = avio_rb32(pb); |
| 551 | codec->channels = avio_rl16(pb); |
| 552 | codec->frame_size = avio_rl16(pb); |
| 553 | break; |
| 554 | default: |
| 555 | goto fail; |
| 556 | } |
| 557 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| 558 | if (ff_get_extradata(codec, pb, avio_rb32(pb)) < 0) |
| 559 | return AVERROR(ENOMEM); |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | /* get until end of block reached */ |
| 564 | while ((avio_tell(pb) % ffm->packet_size) != 0) |
| 565 | avio_r8(pb); |
| 566 | |
| 567 | /* init packet demux */ |
| 568 | ffm->packet_ptr = ffm->packet; |
| 569 | ffm->packet_end = ffm->packet; |
| 570 | ffm->frame_offset = 0; |
| 571 | ffm->dts = 0; |
| 572 | ffm->read_state = READ_HEADER; |
| 573 | ffm->first_packet = 1; |
| 574 | return 0; |
| 575 | fail: |
| 576 | ffm_close(s); |
| 577 | return -1; |
| 578 | } |
| 579 | |
| 580 | /* return < 0 if eof */ |
| 581 | static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 582 | { |
| 583 | int size; |
| 584 | FFMContext *ffm = s->priv_data; |
| 585 | int duration, ret; |
| 586 | |
| 587 | switch(ffm->read_state) { |
| 588 | case READ_HEADER: |
| 589 | if ((ret = ffm_is_avail_data(s, FRAME_HEADER_SIZE+4)) < 0) |
| 590 | return ret; |
| 591 | |
| 592 | av_dlog(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n", |
| 593 | avio_tell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size); |
| 594 | if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) != |
| 595 | FRAME_HEADER_SIZE) |
| 596 | return -1; |
| 597 | if (ffm->header[1] & FLAG_DTS) |
| 598 | if (ffm_read_data(s, ffm->header+16, 4, 1) != 4) |
| 599 | return -1; |
| 600 | ffm->read_state = READ_DATA; |
| 601 | /* fall through */ |
| 602 | case READ_DATA: |
| 603 | size = AV_RB24(ffm->header + 2); |
| 604 | if ((ret = ffm_is_avail_data(s, size)) < 0) |
| 605 | return ret; |
| 606 | |
| 607 | duration = AV_RB24(ffm->header + 5); |
| 608 | |
| 609 | if (av_new_packet(pkt, size) < 0) { |
| 610 | return AVERROR(ENOMEM); |
| 611 | } |
| 612 | pkt->stream_index = ffm->header[0]; |
| 613 | if ((unsigned)pkt->stream_index >= s->nb_streams) { |
| 614 | av_log(s, AV_LOG_ERROR, "invalid stream index %d\n", pkt->stream_index); |
| 615 | av_free_packet(pkt); |
| 616 | ffm->read_state = READ_HEADER; |
| 617 | return -1; |
| 618 | } |
| 619 | pkt->pos = avio_tell(s->pb); |
| 620 | if (ffm->header[1] & FLAG_KEY_FRAME) |
| 621 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 622 | |
| 623 | ffm->read_state = READ_HEADER; |
| 624 | if (ffm_read_data(s, pkt->data, size, 0) != size) { |
| 625 | /* bad case: desynchronized packet. we cancel all the packet loading */ |
| 626 | av_free_packet(pkt); |
| 627 | return -1; |
| 628 | } |
| 629 | pkt->pts = AV_RB64(ffm->header+8); |
| 630 | if (ffm->header[1] & FLAG_DTS) |
| 631 | pkt->dts = pkt->pts - AV_RB32(ffm->header+16); |
| 632 | else |
| 633 | pkt->dts = pkt->pts; |
| 634 | pkt->duration = duration; |
| 635 | break; |
| 636 | } |
| 637 | return 0; |
| 638 | } |
| 639 | |
| 640 | /* seek to a given time in the file. The file read pointer is |
| 641 | positioned at or before pts. XXX: the following code is quite |
| 642 | approximative */ |
| 643 | static int ffm_seek(AVFormatContext *s, int stream_index, int64_t wanted_pts, int flags) |
| 644 | { |
| 645 | FFMContext *ffm = s->priv_data; |
| 646 | int64_t pos_min, pos_max, pos; |
| 647 | int64_t pts_min, pts_max, pts; |
| 648 | double pos1; |
| 649 | |
| 650 | av_dlog(s, "wanted_pts=%0.6f\n", wanted_pts / 1000000.0); |
| 651 | /* find the position using linear interpolation (better than |
| 652 | dichotomy in typical cases) */ |
| 653 | if (ffm->write_index && ffm->write_index < ffm->file_size) { |
| 654 | if (get_dts(s, FFM_PACKET_SIZE) < wanted_pts) { |
| 655 | pos_min = FFM_PACKET_SIZE; |
| 656 | pos_max = ffm->write_index - FFM_PACKET_SIZE; |
| 657 | } else { |
| 658 | pos_min = ffm->write_index; |
| 659 | pos_max = ffm->file_size - FFM_PACKET_SIZE; |
| 660 | } |
| 661 | } else { |
| 662 | pos_min = FFM_PACKET_SIZE; |
| 663 | pos_max = ffm->file_size - FFM_PACKET_SIZE; |
| 664 | } |
| 665 | while (pos_min <= pos_max) { |
| 666 | pts_min = get_dts(s, pos_min); |
| 667 | pts_max = get_dts(s, pos_max); |
| 668 | if (pts_min > wanted_pts || pts_max <= wanted_pts) { |
| 669 | pos = pts_min > wanted_pts ? pos_min : pos_max; |
| 670 | goto found; |
| 671 | } |
| 672 | /* linear interpolation */ |
| 673 | pos1 = (double)(pos_max - pos_min) * (double)(wanted_pts - pts_min) / |
| 674 | (double)(pts_max - pts_min); |
| 675 | pos = (((int64_t)pos1) / FFM_PACKET_SIZE) * FFM_PACKET_SIZE; |
| 676 | if (pos <= pos_min) |
| 677 | pos = pos_min; |
| 678 | else if (pos >= pos_max) |
| 679 | pos = pos_max; |
| 680 | pts = get_dts(s, pos); |
| 681 | /* check if we are lucky */ |
| 682 | if (pts == wanted_pts) { |
| 683 | goto found; |
| 684 | } else if (pts > wanted_pts) { |
| 685 | pos_max = pos - FFM_PACKET_SIZE; |
| 686 | } else { |
| 687 | pos_min = pos + FFM_PACKET_SIZE; |
| 688 | } |
| 689 | } |
| 690 | pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max; |
| 691 | |
| 692 | found: |
| 693 | if (ffm_seek1(s, pos) < 0) |
| 694 | return -1; |
| 695 | |
| 696 | /* reset read state */ |
| 697 | ffm->read_state = READ_HEADER; |
| 698 | ffm->packet_ptr = ffm->packet; |
| 699 | ffm->packet_end = ffm->packet; |
| 700 | ffm->first_packet = 1; |
| 701 | |
| 702 | return 0; |
| 703 | } |
| 704 | |
| 705 | static int ffm_probe(AVProbeData *p) |
| 706 | { |
| 707 | if ( |
| 708 | p->buf[0] == 'F' && p->buf[1] == 'F' && p->buf[2] == 'M' && |
| 709 | (p->buf[3] == '1' || p->buf[3] == '2')) |
| 710 | return AVPROBE_SCORE_MAX + 1; |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | AVInputFormat ff_ffm_demuxer = { |
| 715 | .name = "ffm", |
| 716 | .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), |
| 717 | .priv_data_size = sizeof(FFMContext), |
| 718 | .read_probe = ffm_probe, |
| 719 | .read_header = ffm_read_header, |
| 720 | .read_packet = ffm_read_packet, |
| 721 | .read_close = ffm_close, |
| 722 | .read_seek = ffm_seek, |
| 723 | }; |