FFmpeg: libavformat/smoothstreamingenc.c Source File

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libavformat

smoothstreamingenc.c

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1 /*

2 * Live smooth streaming fragmenter

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 */

22 #include "config.h"

23 #include <float.h>

24 #if HAVE_UNISTD_H

25 #include <unistd.h>

26 #endif

28 #include "avformat.h"

29 #include "internal.h"

30 #include "os_support.h"

31 #include "avc.h"

32 #include "url.h"

33 #include "isom.h"

35 #include "libavutil/opt.h"

36 #include "libavutil/avstring.h"

37 #include "libavutil/mathematics.h"

38 #include "libavutil/intreadwrite.h"

40 typedef struct {

41 char file[1024];

42 char infofile[1024];

43 int64_t start_time, duration;

44 int n;

45 int64_t start_pos, size;

46 } Fragment;

48 typedef struct {

49 AVFormatContext *ctx;

50 int ctx_inited;

51 char dirname[1024];

52 uint8_t iobuf[32768];

53 URLContext *out; // Current output stream where all output is written

54 URLContext *out2; // Auxiliary output stream where all output is also written

55 URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere

56 int64_t tail_pos, cur_pos, cur_start_pos;

57 int packets_written;

58 const char *stream_type_tag;

59 int nb_fragments, fragments_size, fragment_index;

60 Fragment **fragments;

62 const char *fourcc;

63 char *private_str;

64 int packet_size;

65 int audio_tag;

66 } OutputStream;

68 typedef struct {

69 const AVClass *class; /* Class for private options. */

70 int window_size;

71 int extra_window_size;

72 int lookahead_count;

73 int min_frag_duration;

74 int remove_at_exit;

75 OutputStream *streams;

76 int has_video, has_audio;

77 int nb_fragments;

78 } SmoothStreamingContext;

80 static int ism_write(void *opaque, uint8_t *buf, int buf_size)

81 {

82 OutputStream *os = opaque;

83 if (os->out)

84 ffurl_write(os->out, buf, buf_size);

85 if (os->out2)

86 ffurl_write(os->out2, buf, buf_size);

87 os->cur_pos += buf_size;

88 if (os->cur_pos >= os->tail_pos)

89 os->tail_pos = os->cur_pos;

90 return buf_size;

91 }

93 static int64_t ism_seek(void *opaque, int64_t offset, int whence)

94 {

95 OutputStream *os = opaque;

96 int i;

97 if (whence != SEEK_SET)

98 return AVERROR(ENOSYS);

99 if (os->tail_out) {

100 if (os->out) {

101 ffurl_close(os->out);

102 }

103 if (os->out2) {

104 ffurl_close(os->out2);

105 }

106 os->out = os->tail_out;

107 os->out2 = NULL;

108 os->tail_out = NULL;

109 }

110 if (offset >= os->cur_start_pos) {

111 if (os->out)

112 ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);

113 os->cur_pos = offset;

114 return offset;

115 }

116 for (i = os->nb_fragments - 1; i >= 0; i--) {

117 Fragment *frag = os->fragments[i];

118 if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {

119 int ret;

120 AVDictionary *opts = NULL;

121 os->tail_out = os->out;

122 av_dict_set(&opts, "truncate", "0", 0);

123 ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);

124 av_dict_free(&opts);

125 if (ret < 0) {

126 os->out = os->tail_out;

127 os->tail_out = NULL;

128 return ret;

129 }

130 av_dict_set(&opts, "truncate", "0", 0);

131 ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);

132 av_dict_free(&opts);

133 ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);

134 if (os->out2)

135 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);

136 os->cur_pos = offset;

137 return offset;

138 }

139 }

140 return AVERROR(EIO);

141 }

142

143 static void get_private_data(OutputStream *os)

144 {

145 AVCodecContext *codec = os->ctx->streams[0]->codec;

146 uint8_t *ptr = codec->extradata;

147 int size = codec->extradata_size;

148 int i;

149 if (codec->codec_id == AV_CODEC_ID_H264) {

150 ff_avc_write_annexb_extradata(ptr, &ptr, &size);

151 if (!ptr)

152 ptr = codec->extradata;

153 }

154 if (!ptr)

155 return;

156 os->private_str = av_mallocz(2*size + 1);

157 if (!os->private_str)

158 goto fail;

159 for (i = 0; i < size; i++)

160 snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);

161 fail:

162 if (ptr != codec->extradata)

163 av_free(ptr);

164 }

165

166 static void ism_free(AVFormatContext *s)

167 {

168 SmoothStreamingContext *c = s->priv_data;

169 int i, j;

170 if (!c->streams)

171 return;

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

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

174 ffurl_close(os->out);

175 ffurl_close(os->out2);

176 ffurl_close(os->tail_out);

177 os->out = os->out2 = os->tail_out = NULL;

178 if (os->ctx && os->ctx_inited)

179 av_write_trailer(os->ctx);

180 if (os->ctx && os->ctx->pb)

181 av_free(os->ctx->pb);

182 if (os->ctx)

183 avformat_free_context(os->ctx);

184 av_free(os->private_str);

185 for (j = 0; j < os->nb_fragments; j++)

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

187 av_free(os->fragments);

188 }

189 av_freep(&c->streams);

190 }

191

192 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)

193 {

194 int removed = 0, i, start = 0;

195 if (os->nb_fragments <= 0)

196 return;

197 if (os->fragments[0]->n > 0)

198 removed = 1;

199 if (final)

200 skip = 0;

201 if (window_size)

202 start = FFMAX(os->nb_fragments - skip - window_size, 0);

203 for (i = start; i < os->nb_fragments - skip; i++) {

204 Fragment *frag = os->fragments[i];

205 if (!final || removed)

206 avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);

207 else

208 avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);

209 }

210 }

211

212 static int write_manifest(AVFormatContext *s, int final)

213 {

214 SmoothStreamingContext *c = s->priv_data;

215 AVIOContext *out;

216 char filename[1024], temp_filename[1024];

217 int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;

218 int64_t duration = 0;

219

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

221 snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename);

222 ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);

223 if (ret < 0) {

224 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);

225 return ret;

226 }

227 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");

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

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

230 if (os->nb_fragments > 0) {

231 Fragment *last = os->fragments[os->nb_fragments - 1];

232 duration = last->start_time + last->duration;

233 }

234 if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

235 video_chunks = os->nb_fragments;

236 video_streams++;

237 } else {

238 audio_chunks = os->nb_fragments;

239 audio_streams++;

240 }

241 }

242 if (!final) {

243 duration = 0;

244 video_chunks = audio_chunks = 0;

245 }

246 if (c->window_size) {

247 video_chunks = FFMIN(video_chunks, c->window_size);

248 audio_chunks = FFMIN(audio_chunks, c->window_size);

249 }

250 avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);

251 if (!final)

252 avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);

253 avio_printf(out, ">\n");

254 if (c->has_video) {

255 int last = -1, index = 0;

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

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

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

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

260 continue;

261 last = i;

262 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);

263 index++;

264 }

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

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

267 }

268 if (c->has_audio) {

269 int last = -1, index = 0;

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

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

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

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

274 continue;

275 last = i;

276 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);

277 index++;

278 }

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

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

281 }

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

283 avio_flush(out);

284 avio_close(out);

285 rename(temp_filename, filename);

286 return 0;

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) < 0) {

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

297 ret = AVERROR(errno);

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 char buf[10];

319

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

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

322 ret = AVERROR(EINVAL);

323 goto fail;

324 }

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

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

327 ret = AVERROR(errno);

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

329 goto fail;

330 }

331

332 ctx = avformat_alloc_context();

333 if (!ctx) {

334 ret = AVERROR(ENOMEM);

335 goto fail;

336 }

337 os->ctx = ctx;

338 ctx->oformat = oformat;

339 ctx->interrupt_callback = s->interrupt_callback;

340

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

342 ret = AVERROR(ENOMEM);

343 goto fail;

344 }

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

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

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

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

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

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

358 goto fail;

359 }

360 os->ctx_inited = 1;

361 avio_flush(ctx->pb);

362 av_dict_free(&opts);

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

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

365 c->has_video = 1;

366 os->stream_type_tag = "video";

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

368 os->fourcc = "H264";

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

370 os->fourcc = "WVC1";

371 } else {

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

373 ret = AVERROR(EINVAL);

374 goto fail;

375 }

376 } else {

377 c->has_audio = 1;

378 os->stream_type_tag = "audio";

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

380 os->fourcc = "AACL";

381 os->audio_tag = 0xff;

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

383 os->fourcc = "WMAP";

384 os->audio_tag = 0x0162;

385 } else {

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

387 ret = AVERROR(EINVAL);

388 goto fail;

389 }

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

391 }

392 get_private_data(os);

393 }

394

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

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

397 ret = AVERROR(EINVAL);

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 start_pos = os->tail_pos, 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 - 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 rename(filename, target_filename);

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

546 }

547

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

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

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

551 int j;

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

553 if (final && c->remove_at_exit)

554 remove = os->nb_fragments;

555 if (remove > 0) {

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

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

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

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

560 }

561 os->nb_fragments -= remove;

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

563 }

564 if (final && c->remove_at_exit)

565 rmdir(os->dirname);

566 }

567 }

568

569 if (ret >= 0)

570 ret = write_manifest(s, final);

571 return ret;

572 }

573

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

575 {

576 SmoothStreamingContext *c = s->priv_data;

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

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

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

580 int ret;

581

582 if (st->first_dts == AV_NOPTS_VALUE)

583 st->first_dts = pkt->dts;

584

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

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

587 end_dts, AV_TIME_BASE_Q) >= 0 &&

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

589

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

591 return ret;

592 c->nb_fragments++;

593 }

594

595 os->packets_written++;

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

597 }

598

599 static int ism_write_trailer(AVFormatContext *s)

600 {

601 SmoothStreamingContext *c = s->priv_data;

602 ism_flush(s, 1);

603

604 if (c->remove_at_exit) {

605 char filename[1024];

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

607 unlink(filename);

608 rmdir(s->filename);

609 }

610

611 ism_free(s);

612 return 0;

613 }

614

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

616 #define E AV_OPT_FLAG_ENCODING_PARAM

617 static const AVOption options[] = {

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

619 { "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 },

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

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

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

623 { NULL },

624 };

625

626 static const AVClass ism_class = {

627 .class_name = "smooth streaming muxer",

628 .item_name = av_default_item_name,

629 .option = options,

630 .version = LIBAVUTIL_VERSION_INT,

631 };

632

633