FFmpeg: libavformat/smoothstreamingenc.c Source File

257 avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);

258 for (i = 0; i < s->nb_streams; i++) {

259 OutputStream *os = &c->streams[i];

260 if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)

261 continue;

262 last = i;

263 avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->width, s->streams[i]->codec->height, os->private_str);

264 index++;

265 }

266 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);

267 avio_printf(out, "</StreamIndex>\n");

268 }

269 if (c->has_audio) {

270 int last = -1, index = 0;

271 avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);

272 for (i = 0; i < s->nb_streams; i++) {

273 OutputStream *os = &c->streams[i];

274 if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)

275 continue;

276 last = i;

277 avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->sample_rate, s->streams[i]->codec->channels, os->packet_size, os->audio_tag, os->private_str);

278 index++;

279 }

280 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);

281 avio_printf(out, "</StreamIndex>\n");

282 }

283 avio_printf(out, "</SmoothStreamingMedia>\n");

284 avio_flush(out);

285 avio_close(out);

286 return ff_rename(temp_filename, filename, s);

287 }

288

289 static int ism_write_header(AVFormatContext *s)

290 {

291 SmoothStreamingContext *c = s->priv_data;

292 int ret = 0, i;

293 AVOutputFormat *oformat;

294

295 if (mkdir(s->filename, 0777) == -1 && errno != EEXIST) {

296 ret = AVERROR(errno);

297 av_log(s, AV_LOG_ERROR, "mkdir failed\n");

298 goto fail;

299 }

300

301 oformat = av_guess_format("ismv", NULL, NULL);

302 if (!oformat) {

303 ret = AVERROR_MUXER_NOT_FOUND;

304 goto fail;

305 }

306

307 c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams));

308 if (!c->streams) {

309 ret = AVERROR(ENOMEM);

310 goto fail;

311 }

312

313 for (i = 0; i < s->nb_streams; i++) {

314 OutputStream *os = &c->streams[i];

315 AVFormatContext *ctx;

316 AVStream *st;

317 AVDictionary *opts = NULL;

318

319 if (!s->streams[i]->codec->bit_rate) {

320 av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);

321 ret = AVERROR(EINVAL);

322 goto fail;

323 }

324 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);

325 if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {

326 ret = AVERROR(errno);

327 av_log(s, AV_LOG_ERROR, "mkdir failed\n");

328 goto fail;

329 }

330

331 ctx = avformat_alloc_context();

332 if (!ctx) {

333 ret = AVERROR(ENOMEM);

334 goto fail;

335 }

336 os->ctx = ctx;

337 ctx->oformat = oformat;

338 ctx->interrupt_callback = s->interrupt_callback;

339

340 if (!(st = avformat_new_stream(ctx, NULL))) {

341 ret = AVERROR(ENOMEM);

342 goto fail;

343 }

344 avcodec_copy_context(st->codec, s->streams[i]->codec);

345 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;

346 st->time_base = s->streams[i]->time_base;

347

348 ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);

349 if (!ctx->pb) {

350 ret = AVERROR(ENOMEM);

351 goto fail;

352 }

353

354 av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);

355 av_dict_set(&opts, "movflags", "frag_custom", 0);

356 if ((ret = avformat_write_header(ctx, &opts)) < 0) {

357 goto fail;

358 }

359 os->ctx_inited = 1;

360 avio_flush(ctx->pb);

361 av_dict_free(&opts);

362 s->streams[i]->time_base = st->time_base;

363 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

364 c->has_video = 1;

365 os->stream_type_tag = "video";

366 if (st->codec->codec_id == AV_CODEC_ID_H264) {

367 os->fourcc = "H264";

368 } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {

369 os->fourcc = "WVC1";

370 } else {

371 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");

372 ret = AVERROR(EINVAL);

373 goto fail;

374 }

375 } else {

376 c->has_audio = 1;

377 os->stream_type_tag = "audio";

378 if (st->codec->codec_id == AV_CODEC_ID_AAC) {

379 os->fourcc = "AACL";

380 os->audio_tag = 0xff;

381 } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {

382 os->fourcc = "WMAP";

383 os->audio_tag = 0x0162;

384 } else {

385 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");

386 ret = AVERROR(EINVAL);

387 goto fail;

388 }

389 os->packet_size = st->codec->block_align ? st->codec->block_align : 4;

390 }

391 get_private_data(os);

392 }

393

394 if (!c->has_video && c->min_frag_duration <= 0) {

395 av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");

396 ret = AVERROR(EINVAL);

397 goto fail;

398 }

399 ret = write_manifest(s, 0);

400

401 fail:

402 if (ret)

403 ism_free(s);

404 return ret;

405 }

406

407 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)

408 {

409 AVIOContext *in;

410 int ret;

411 uint32_t len;

412 if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)

413 return ret;

414 ret = AVERROR(EIO);

415 *moof_size = avio_rb32(in);

416 if (*moof_size < 8 || *moof_size > size)

417 goto fail;

418 if (avio_rl32(in) != MKTAG('m','o','o','f'))

419 goto fail;

420 len = avio_rb32(in);

421 if (len > *moof_size)

422 goto fail;

423 if (avio_rl32(in) != MKTAG('m','f','h','d'))

424 goto fail;

425 avio_seek(in, len - 8, SEEK_CUR);

426 avio_rb32(in); /* traf size */

427 if (avio_rl32(in) != MKTAG('t','r','a','f'))

428 goto fail;

429 while (avio_tell(in) < *moof_size) {

430 uint32_t len = avio_rb32(in);

431 uint32_t tag = avio_rl32(in);

432 int64_t end = avio_tell(in) + len - 8;

433 if (len < 8 || len >= *moof_size)

434 goto fail;

435 if (tag == MKTAG('u','u','i','d')) {

436 static const uint8_t tfxd[] = {

437 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,

438 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2

439 };

440 uint8_t uuid[16];

441 avio_read(in, uuid, 16);

442 if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {

443 avio_seek(in, 4, SEEK_CUR);

444 *start_ts = avio_rb64(in);

445 *duration = avio_rb64(in);

446 ret = 0;

447 break;

448 }

449 }

450 avio_seek(in, end, SEEK_SET);

451 }

452 fail:

453 avio_close(in);

454 return ret;

455 }

456

457 static int add_fragment(OutputStream *os, const char *file, const char *infofile, int64_t start_time, int64_t duration, int64_t start_pos, int64_t size)

458 {

459 int err;

460 Fragment *frag;

461 if (os->nb_fragments >= os->fragments_size) {

462 os->fragments_size = (os->fragments_size + 1) * 2;

463 if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) *

464 os->fragments_size)) < 0) {

465 os->fragments_size = 0;

466 os->nb_fragments = 0;

467 return err;

468 }

469 }

470 frag = av_mallocz(sizeof(*frag));

471 if (!frag)

472 return AVERROR(ENOMEM);

473 av_strlcpy(frag->file, file, sizeof(frag->file));

474 av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));

475 frag->start_time = start_time;

476 frag->duration = duration;

477 frag->start_pos = start_pos;

478 frag->size = size;

479 frag->n = os->fragment_index;

480 os->fragments[os->nb_fragments++] = frag;

481 os->fragment_index++;

482 return 0;

483 }

484

485 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)

486 {

487 AVIOContext *in, *out;

488 int ret = 0;

489 if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)

490 return ret;

491 if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {

492 avio_close(in);

493 return ret;

494 }

495 while (size > 0) {

496 uint8_t buf[8192];

497 int n = FFMIN(size, sizeof(buf));

498 n = avio_read(in, buf, n);

499 if (n <= 0) {

500 ret = AVERROR(EIO);

501 break;

502 }

503 avio_write(out, buf, n);

504 size -= n;

505 }

506 avio_flush(out);

507 avio_close(out);

508 avio_close(in);

509 return ret;

510 }

511

512 static int ism_flush(AVFormatContext *s, int final)

513 {

514 SmoothStreamingContext *c = s->priv_data;

515 int i, ret = 0;

516

517 for (i = 0; i < s->nb_streams; i++) {

518 OutputStream *os = &c->streams[i];

519 char filename[1024], target_filename[1024], header_filename[1024];

520 int64_t size;

521 int64_t start_ts, duration, moof_size;

522 if (!os->packets_written)

523 continue;

524

525 snprintf(filename, sizeof(filename), "%s/temp", os->dirname);

526 ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);

527 if (ret < 0)

528 break;

529 os->cur_start_pos = os->tail_pos;

530 av_write_frame(os->ctx, NULL);

531 avio_flush(os->ctx->pb);

532 os->packets_written = 0;

533 if (!os->out || os->tail_out)

534 return AVERROR(EIO);

535

536 ffurl_close(os->out);

537 os->out = NULL;

538 size = os->tail_pos - os->cur_start_pos;

539 if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)

540 break;

541 snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);

542 snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);

543 copy_moof(s, filename, header_filename, moof_size);

544 ret = ff_rename(filename, target_filename, s);

545 if (ret < 0)

546 break;

547 add_fragment(os, target_filename, header_filename, start_ts, duration,

548 os->cur_start_pos, size);

549 }

550

551 if (c->window_size || (final && c->remove_at_exit)) {

552 for (i = 0; i < s->nb_streams; i++) {

553 OutputStream *os = &c->streams[i];

554 int j;

555 int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;

556 if (final && c->remove_at_exit)

557 remove = os->nb_fragments;

558 if (remove > 0) {

559 for (j = 0; j < remove; j++) {

560 unlink(os->fragments[j]->file);

561 unlink(os->fragments[j]->infofile);

562 av_freep(&os->fragments[j]);

563 }

564 os->nb_fragments -= remove;

565 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));

566 }

567 if (final && c->remove_at_exit)

568 rmdir(os->dirname);

569 }

570 }

571

572 if (ret >= 0)

573 ret = write_manifest(s, final);

574 return ret;

575 }

576

577 static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)

578 {

579 SmoothStreamingContext *c = s->priv_data;

580 AVStream *st = s->streams[pkt->stream_index];

581 OutputStream *os = &c->streams[pkt->stream_index];

582 int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration;

583 int ret;

584

585 if (st->first_dts == AV_NOPTS_VALUE)

586 st->first_dts = pkt->dts;

587

588 if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&

589 av_compare_ts(pkt->dts - st->first_dts, st->time_base,

590 end_dts, AV_TIME_BASE_Q) >= 0 &&

591 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {

592

593 if ((ret = ism_flush(s, 0)) < 0)

594 return ret;

595 c->nb_fragments++;

596 }

597

598 os->packets_written++;

599 return ff_write_chained(os->ctx, 0, pkt, s, 0);

600 }

601

602 static int ism_write_trailer(AVFormatContext *s)

603 {

604 SmoothStreamingContext *c = s->priv_data;

605 ism_flush(s, 1);

606

607 if (c->remove_at_exit) {

608 char filename[1024];

609 snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);

610 unlink(filename);

611 rmdir(s->filename);

612 }

613

614 ism_free(s);

615 return 0;

616 }

617

618 #define OFFSET(x) offsetof(SmoothStreamingContext, x)

619 #define E AV_OPT_FLAG_ENCODING_PARAM

620 static const AVOption options[] = {

621 { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },

622 { "extra_window_size", "number of fragments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },

623 { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },

624 { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },

625 { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },

626 { NULL },

627 };

628

629 static const AVClass ism_class = {

630 .class_name = "smooth streaming muxer",

631 .item_name = av_default_item_name,

632 .option = options,

633 .version = LIBAVUTIL_VERSION_INT,

634 };

635

636