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