FFmpeg: libavformat/smoothstreamingenc.c Source File

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

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

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

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

257 continue;

258 last = i;

259 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);

260 index++;

261 }

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

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

264 }

265 if (c->has_audio) {

266 int last = -1, index = 0;

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

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

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

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

271 continue;

272 last = i;

273 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);

274 index++;

275 }

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

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

278 }

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

280 avio_flush(out);

281 avio_close(out);

282 rename(temp_filename, filename);

283 return 0;

284 }

285

286 static int ism_write_header(AVFormatContext *s)

287 {

288 SmoothStreamingContext *c = s->priv_data;

289 int ret = 0, i;

290 AVOutputFormat *oformat;

291

292 if (mkdir(s->filename, 0777) < 0) {

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

294 ret = AVERROR(errno);

295 goto fail;

296 }

297

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

299 if (!oformat) {

300 ret = AVERROR_MUXER_NOT_FOUND;

301 goto fail;

302 }

303

304 c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);

305 if (!c->streams) {

306 ret = AVERROR(ENOMEM);

307 goto fail;

308 }

309

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

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

312 AVFormatContext *ctx;

313 AVStream *st;

314 AVDictionary *opts = NULL;

315 char buf[10];

316

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

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

319 ret = AVERROR(EINVAL);

320 goto fail;

321 }

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

323 if (mkdir(os->dirname, 0777) < 0) {

324 ret = AVERROR(errno);

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

326 goto fail;

327 }

328

329 ctx = avformat_alloc_context();

330 if (!ctx) {

331 ret = AVERROR(ENOMEM);

332 goto fail;

333 }

334 os->ctx = ctx;

335 ctx->oformat = oformat;

336 ctx->interrupt_callback = s->interrupt_callback;

337

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

339 ret = AVERROR(ENOMEM);

340 goto fail;

341 }

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

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

344

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

346 if (!ctx->pb) {

347 ret = AVERROR(ENOMEM);

348 goto fail;

349 }

350

351 snprintf(buf, sizeof(buf), "%d", c->lookahead_count);

352 av_dict_set(&opts, "ism_lookahead", buf, 0);

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

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

355 goto fail;

356 }

357 os->ctx_inited = 1;

358 avio_flush(ctx->pb);

359 av_dict_free(&opts);

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

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

362 c->has_video = 1;

363 os->stream_type_tag = "video";

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

365 os->fourcc = "H264";

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

367 os->fourcc = "WVC1";

368 } else {

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

370 ret = AVERROR(EINVAL);

371 goto fail;

372 }

373 } else {

374 c->has_audio = 1;

375 os->stream_type_tag = "audio";

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

377 os->fourcc = "AACL";

378 os->audio_tag = 0xff;

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

380 os->fourcc = "WMAP";

381 os->audio_tag = 0x0162;

382 } else {

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

384 ret = AVERROR(EINVAL);

385 goto fail;

386 }

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

388 }

389 get_private_data(os);

390 }

391

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

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

394 ret = AVERROR(EINVAL);

395 }

396 ret = write_manifest(s, 0);

397

398 fail:

399 if (ret)

400 ism_free(s);

401 return ret;

402 }

403

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

405 {

406 AVIOContext *in;

407 int ret;

408 uint32_t len;

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

410 return ret;

411 ret = AVERROR(EIO);

412 *moof_size = avio_rb32(in);

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

414 goto fail;

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

416 goto fail;

417 len = avio_rb32(in);

418 if (len > *moof_size)

419 goto fail;

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

421 goto fail;

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

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

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

425 goto fail;

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

427 uint32_t len = avio_rb32(in);

428 uint32_t tag = avio_rl32(in);

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

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

431 goto fail;

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

433 static const uint8_t tfxd[] = {

434 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,

435 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2

436 };

437 uint8_t uuid[16];

438 avio_read(in, uuid, 16);

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

440 avio_seek(in, 4, SEEK_CUR);

441 *start_ts = avio_rb64(in);

442 *duration = avio_rb64(in);

443 ret = 0;

444 break;

445 }

446 }

447 avio_seek(in, end, SEEK_SET);

448 }

449 fail:

450 avio_close(in);

451 return ret;

452 }

453

454 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)

455 {

456 int err;

457 Fragment *frag;

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

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

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

461 os->fragments_size)) < 0) {

462 os->fragments_size = 0;

463 os->nb_fragments = 0;

464 return err;

465 }

466 }

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

468 if (!frag)

469 return AVERROR(ENOMEM);

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

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

472 frag->start_time = start_time;

473 frag->duration = duration;

474 frag->start_pos = start_pos;

475 frag->size = size;

476 frag->n = os->fragment_index;

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

478 os->fragment_index++;

479 return 0;

480 }

481

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

483 {

484 AVIOContext *in, *out;

485 int ret = 0;

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

487 return ret;

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

489 avio_close(in);

490 return ret;

491 }

492 while (size > 0) {

493 uint8_t buf[8192];

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

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

496 if (n <= 0) {

497 ret = AVERROR(EIO);

498 break;

499 }

500 avio_write(out, buf, n);

501 size -= n;

502 }

503 avio_flush(out);

504 avio_close(out);

505 avio_close(in);

506 return ret;

507 }

508

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

510 {

511 SmoothStreamingContext *c = s->priv_data;

512 int i, ret = 0;

513

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

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

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

517 int64_t start_pos = os->tail_pos, size;

518 int64_t start_ts, duration, moof_size;

519 if (!os->packets_written)

520 continue;

521

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

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

524 if (ret < 0)

525 break;

526 os->cur_start_pos = os->tail_pos;

527 av_write_frame(os->ctx, NULL);

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

529 os->packets_written = 0;

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

531 return AVERROR(EIO);

532

533 ffurl_close(os->out);

534 os->out = NULL;

535 size = os->tail_pos - start_pos;

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

537 break;

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

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

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

541 rename(filename, target_filename);

542 add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size);

543 }

544

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

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

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

548 int j;

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

550 if (final && c->remove_at_exit)

551 remove = os->nb_fragments;

552 if (remove > 0) {

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

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

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

556 av_free(os->fragments[j]);

557 }

558 os->nb_fragments -= remove;

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

560 }

561 if (final && c->remove_at_exit)

562 rmdir(os->dirname);

563 }

564 }

565

566 if (ret >= 0)

567 ret = write_manifest(s, final);

568 return ret;

569 }

570

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

572 {

573 SmoothStreamingContext *c = s->priv_data;

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

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

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

577 int ret;

578

579 if (st->first_dts == AV_NOPTS_VALUE)

580 st->first_dts = pkt->dts;

581

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

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

584 end_dts, AV_TIME_BASE_Q) >= 0 &&

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

586

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

588 return ret;

589 c->nb_fragments++;

590 }

591

592 os->packets_written++;

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

594 }

595

596 static int ism_write_trailer(AVFormatContext *s)

597 {

598 SmoothStreamingContext *c = s->priv_data;

599 ism_flush(s, 1);

600

601 if (c->remove_at_exit) {

602 char filename[1024];

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

604 unlink(filename);

605 rmdir(s->filename);

606 }

607

608 ism_free(s);

609 return 0;

610 }

611

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

613 #define E AV_OPT_FLAG_ENCODING_PARAM

614 static const AVOption options[] = {

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

616 { "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 },

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

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

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

620 { NULL },

621 };

622

623 static const AVClass ism_class = {

624 .class_name = "smooth streaming muxer",

625 .item_name = av_default_item_name,

626 .option = options,

627 .version = LIBAVUTIL_VERSION_INT,

628 };

629

630