FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/smoothstreamingenc.c
Date: 2024-03-29 11:55:30
Exec Total Coverage
Lines: 0 391 0.0%
Functions: 0 13 0.0%
Branches: 0 228 0.0%

Line Branch Exec Source
1 /*
2 * Live smooth streaming fragmenter
3 * Copyright (c) 2012 Martin Storsjo
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 "config.h"
23 #if HAVE_UNISTD_H
24 #include <unistd.h>
25 #endif
26
27 #include "avformat.h"
28 #include "internal.h"
29 #include "mux.h"
30 #include "os_support.h"
31 #include "avc.h"
32 #include "url.h"
33
34 #include "libavutil/opt.h"
35 #include "libavutil/avstring.h"
36 #include "libavutil/mathematics.h"
37 #include "libavutil/uuid.h"
38
39 typedef struct Fragment {
40 int64_t start_time, duration;
41 int n;
42 int64_t start_pos, size;
43 char file[1024];
44 char infofile[1024];
45 } Fragment;
46
47 typedef struct OutputStream {
48 AVFormatContext *ctx;
49 URLContext *out; // Current output stream where all output is written
50 URLContext *out2; // Auxiliary output stream where all output is also written
51 URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
52 int64_t tail_pos, cur_pos, cur_start_pos;
53 int packets_written;
54 const char *stream_type_tag;
55 int nb_fragments, fragments_size, fragment_index;
56 Fragment **fragments;
57
58 const char *fourcc;
59 char *private_str;
60 int packet_size;
61 int audio_tag;
62 char dirname[1024];
63 uint8_t iobuf[32768];
64 } OutputStream;
65
66 typedef struct SmoothStreamingContext {
67 const AVClass *class; /* Class for private options. */
68 int window_size;
69 int extra_window_size;
70 int lookahead_count;
71 int min_frag_duration;
72 int remove_at_exit;
73 OutputStream *streams;
74 int has_video, has_audio;
75 int nb_fragments;
76 } SmoothStreamingContext;
77
78 static int ism_write(void *opaque, const uint8_t *buf, int buf_size)
79 {
80 OutputStream *os = opaque;
81 if (os->out)
82 ffurl_write(os->out, buf, buf_size);
83 if (os->out2)
84 ffurl_write(os->out2, buf, buf_size);
85 os->cur_pos += buf_size;
86 if (os->cur_pos >= os->tail_pos)
87 os->tail_pos = os->cur_pos;
88 return buf_size;
89 }
90
91 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
92 {
93 OutputStream *os = opaque;
94 int i;
95 if (whence != SEEK_SET)
96 return AVERROR(ENOSYS);
97 if (os->tail_out) {
98 ffurl_closep(&os->out);
99 ffurl_closep(&os->out2);
100 os->out = os->tail_out;
101 os->tail_out = NULL;
102 }
103 if (offset >= os->cur_start_pos) {
104 if (os->out)
105 ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
106 os->cur_pos = offset;
107 return offset;
108 }
109 for (i = os->nb_fragments - 1; i >= 0; i--) {
110 Fragment *frag = os->fragments[i];
111 if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
112 int ret;
113 AVDictionary *opts = NULL;
114 os->tail_out = os->out;
115 av_dict_set(&opts, "truncate", "0", 0);
116 ret = ffurl_open_whitelist(&os->out, frag->file, AVIO_FLAG_WRITE,
117 &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
118 av_dict_free(&opts);
119 if (ret < 0) {
120 os->out = os->tail_out;
121 os->tail_out = NULL;
122 return ret;
123 }
124 av_dict_set(&opts, "truncate", "0", 0);
125 ffurl_open_whitelist(&os->out2, frag->infofile, AVIO_FLAG_WRITE,
126 &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
127 av_dict_free(&opts);
128 ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
129 if (os->out2)
130 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
131 os->cur_pos = offset;
132 return offset;
133 }
134 }
135 return AVERROR(EIO);
136 }
137
138 static void get_private_data(OutputStream *os)
139 {
140 AVCodecParameters *par = os->ctx->streams[0]->codecpar;
141 uint8_t *ptr = par->extradata;
142 int size = par->extradata_size;
143 int i;
144 if (par->codec_id == AV_CODEC_ID_H264) {
145 ff_avc_write_annexb_extradata(ptr, &ptr, &size);
146 if (!ptr)
147 ptr = par->extradata;
148 }
149 if (!ptr)
150 return;
151 os->private_str = av_mallocz(2*size + 1);
152 if (!os->private_str)
153 goto fail;
154 for (i = 0; i < size; i++)
155 snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
156 fail:
157 if (ptr != par->extradata)
158 av_free(ptr);
159 }
160
161 static void ism_free(AVFormatContext *s)
162 {
163 SmoothStreamingContext *c = s->priv_data;
164 int i, j;
165 if (!c->streams)
166 return;
167 for (i = 0; i < s->nb_streams; i++) {
168 OutputStream *os = &c->streams[i];
169 ffurl_closep(&os->out);
170 ffurl_closep(&os->out2);
171 ffurl_closep(&os->tail_out);
172 if (os->ctx && os->ctx->pb)
173 avio_context_free(&os->ctx->pb);
174 avformat_free_context(os->ctx);
175 av_freep(&os->private_str);
176 for (j = 0; j < os->nb_fragments; j++)
177 av_freep(&os->fragments[j]);
178 av_freep(&os->fragments);
179 }
180 av_freep(&c->streams);
181 }
182
183 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
184 {
185 int removed = 0, i, start = 0;
186 if (os->nb_fragments <= 0)
187 return;
188 if (os->fragments[0]->n > 0)
189 removed = 1;
190 if (final)
191 skip = 0;
192 if (window_size)
193 start = FFMAX(os->nb_fragments - skip - window_size, 0);
194 for (i = start; i < os->nb_fragments - skip; i++) {
195 Fragment *frag = os->fragments[i];
196 if (!final || removed)
197 avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
198 else
199 avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
200 }
201 }
202
203 static int write_manifest(AVFormatContext *s, int final)
204 {
205 SmoothStreamingContext *c = s->priv_data;
206 AVIOContext *out;
207 char filename[1024], temp_filename[1024];
208 int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
209 int64_t duration = 0;
210
211 snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
212 snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->url);
213 ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
214 if (ret < 0) {
215 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
216 return ret;
217 }
218 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
219 for (i = 0; i < s->nb_streams; i++) {
220 OutputStream *os = &c->streams[i];
221 if (os->nb_fragments > 0) {
222 Fragment *last = os->fragments[os->nb_fragments - 1];
223 duration = last->start_time + last->duration;
224 }
225 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
226 video_chunks = os->nb_fragments;
227 video_streams++;
228 } else {
229 audio_chunks = os->nb_fragments;
230 audio_streams++;
231 }
232 }
233 if (!final) {
234 duration = 0;
235 video_chunks = audio_chunks = 0;
236 }
237 if (c->window_size) {
238 video_chunks = FFMIN(video_chunks, c->window_size);
239 audio_chunks = FFMIN(audio_chunks, c->window_size);
240 }
241 avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
242 if (!final)
243 avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
244 avio_printf(out, ">\n");
245 if (c->has_video) {
246 int last = -1, index = 0;
247 avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
248 for (i = 0; i < s->nb_streams; i++) {
249 OutputStream *os = &c->streams[i];
250 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
251 continue;
252 last = i;
253 avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height, os->private_str);
254 index++;
255 }
256 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
257 avio_printf(out, "</StreamIndex>\n");
258 }
259 if (c->has_audio) {
260 int last = -1, index = 0;
261 avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
262 for (i = 0; i < s->nb_streams; i++) {
263 OutputStream *os = &c->streams[i];
264 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
265 continue;
266 last = i;
267 avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n",
268 index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate,
269 s->streams[i]->codecpar->ch_layout.nb_channels, os->packet_size, os->audio_tag, os->private_str);
270 index++;
271 }
272 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
273 avio_printf(out, "</StreamIndex>\n");
274 }
275 avio_printf(out, "</SmoothStreamingMedia>\n");
276 avio_flush(out);
277 ff_format_io_close(s, &out);
278 return ff_rename(temp_filename, filename, s);
279 }
280
281 static int ism_write_header(AVFormatContext *s)
282 {
283 SmoothStreamingContext *c = s->priv_data;
284 int ret = 0, i;
285 const AVOutputFormat *oformat;
286
287 if (mkdir(s->url, 0777) == -1 && errno != EEXIST) {
288 av_log(s, AV_LOG_ERROR, "mkdir failed\n");
289 return AVERROR(errno);
290 }
291
292 oformat = av_guess_format("ismv", NULL, NULL);
293 if (!oformat) {
294 return AVERROR_MUXER_NOT_FOUND;
295 }
296
297 c->streams = av_calloc(s->nb_streams, sizeof(*c->streams));
298 if (!c->streams) {
299 return AVERROR(ENOMEM);
300 }
301
302 for (i = 0; i < s->nb_streams; i++) {
303 OutputStream *os = &c->streams[i];
304 AVFormatContext *ctx;
305 AVStream *st;
306 AVDictionary *opts = NULL;
307
308 if (!s->streams[i]->codecpar->bit_rate) {
309 av_log(s, AV_LOG_WARNING, "No bit rate set for stream %d\n", i);
310 // create a tmp name for the directory of fragments
311 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(Tmp_%d)", s->url, i);
312 } else {
313 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
314 }
315
316 if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
317 av_log(s, AV_LOG_ERROR, "mkdir failed\n");
318 return AVERROR(errno);
319 }
320
321 os->ctx = ctx = avformat_alloc_context();
322 if (!ctx) {
323 return AVERROR(ENOMEM);
324 }
325 if ((ret = ff_copy_whiteblacklists(ctx, s)) < 0)
326 return ret;
327 ctx->oformat = oformat;
328 ctx->interrupt_callback = s->interrupt_callback;
329
330 if (!(st = avformat_new_stream(ctx, NULL))) {
331 return AVERROR(ENOMEM);
332 }
333 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
334 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
335 st->time_base = s->streams[i]->time_base;
336
337 ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), 1, os, NULL, ism_write, ism_seek);
338 if (!ctx->pb) {
339 return AVERROR(ENOMEM);
340 }
341
342 av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
343 av_dict_set(&opts, "movflags", "+frag_custom", 0);
344 ret = avformat_write_header(ctx, &opts);
345 av_dict_free(&opts);
346 if (ret < 0) {
347 return ret;
348 }
349 avio_flush(ctx->pb);
350 s->streams[i]->time_base = st->time_base;
351 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
352 c->has_video = 1;
353 os->stream_type_tag = "video";
354 if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
355 os->fourcc = "H264";
356 } else if (st->codecpar->codec_id == AV_CODEC_ID_VC1) {
357 os->fourcc = "WVC1";
358 } else {
359 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
360 return AVERROR(EINVAL);
361 }
362 } else {
363 c->has_audio = 1;
364 os->stream_type_tag = "audio";
365 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
366 os->fourcc = "AACL";
367 os->audio_tag = 0xff;
368 } else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
369 os->fourcc = "WMAP";
370 os->audio_tag = 0x0162;
371 } else {
372 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
373 return AVERROR(EINVAL);
374 }
375 os->packet_size = st->codecpar->block_align ? st->codecpar->block_align : 4;
376 }
377 get_private_data(os);
378 }
379
380 if (!c->has_video && c->min_frag_duration <= 0) {
381 av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
382 return AVERROR(EINVAL);
383 }
384 ret = write_manifest(s, 0);
385 if (ret < 0)
386 return ret;
387
388 return 0;
389 }
390
391 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
392 {
393 AVIOContext *in;
394 int ret;
395 uint32_t len;
396 if ((ret = s->io_open(s, &in, filename, AVIO_FLAG_READ, NULL)) < 0)
397 return ret;
398 ret = AVERROR(EIO);
399 *moof_size = avio_rb32(in);
400 if (*moof_size < 8 || *moof_size > size)
401 goto fail;
402 if (avio_rl32(in) != MKTAG('m','o','o','f'))
403 goto fail;
404 len = avio_rb32(in);
405 if (len > *moof_size)
406 goto fail;
407 if (avio_rl32(in) != MKTAG('m','f','h','d'))
408 goto fail;
409 avio_seek(in, len - 8, SEEK_CUR);
410 avio_rb32(in); /* traf size */
411 if (avio_rl32(in) != MKTAG('t','r','a','f'))
412 goto fail;
413 while (avio_tell(in) < *moof_size) {
414 uint32_t len = avio_rb32(in);
415 uint32_t tag = avio_rl32(in);
416 int64_t end = avio_tell(in) + len - 8;
417 if (len < 8 || len >= *moof_size)
418 goto fail;
419 if (tag == MKTAG('u','u','i','d')) {
420 static const AVUUID tfxd = {
421 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
422 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
423 };
424 AVUUID uuid;
425 avio_read(in, uuid, 16);
426 if (av_uuid_equal(uuid, tfxd) && len >= 8 + 16 + 4 + 16) {
427 avio_seek(in, 4, SEEK_CUR);
428 *start_ts = avio_rb64(in);
429 *duration = avio_rb64(in);
430 ret = 0;
431 break;
432 }
433 }
434 avio_seek(in, end, SEEK_SET);
435 }
436 fail:
437 ff_format_io_close(s, &in);
438 return ret;
439 }
440
441 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)
442 {
443 int err;
444 Fragment *frag;
445 if (os->nb_fragments >= os->fragments_size) {
446 os->fragments_size = (os->fragments_size + 1) * 2;
447 if ((err = av_reallocp_array(&os->fragments, sizeof(*os->fragments),
448 os->fragments_size)) < 0) {
449 os->fragments_size = 0;
450 os->nb_fragments = 0;
451 return err;
452 }
453 }
454 frag = av_mallocz(sizeof(*frag));
455 if (!frag)
456 return AVERROR(ENOMEM);
457 av_strlcpy(frag->file, file, sizeof(frag->file));
458 av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
459 frag->start_time = start_time;
460 frag->duration = duration;
461 frag->start_pos = start_pos;
462 frag->size = size;
463 frag->n = os->fragment_index;
464 os->fragments[os->nb_fragments++] = frag;
465 os->fragment_index++;
466 return 0;
467 }
468
469 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
470 {
471 AVIOContext *in, *out;
472 int ret = 0;
473 if ((ret = s->io_open(s, &in, infile, AVIO_FLAG_READ, NULL)) < 0)
474 return ret;
475 if ((ret = s->io_open(s, &out, outfile, AVIO_FLAG_WRITE, NULL)) < 0) {
476 ff_format_io_close(s, &in);
477 return ret;
478 }
479 while (size > 0) {
480 uint8_t buf[8192];
481 int n = FFMIN(size, sizeof(buf));
482 n = avio_read(in, buf, n);
483 if (n <= 0) {
484 ret = AVERROR(EIO);
485 break;
486 }
487 avio_write(out, buf, n);
488 size -= n;
489 }
490 avio_flush(out);
491 ff_format_io_close(s, &out);
492 ff_format_io_close(s, &in);
493 return ret;
494 }
495
496 static int ism_flush(AVFormatContext *s, int final)
497 {
498 SmoothStreamingContext *c = s->priv_data;
499 int i, ret = 0;
500
501 for (i = 0; i < s->nb_streams; i++) {
502 OutputStream *os = &c->streams[i];
503 char filename[1024], target_filename[1024], header_filename[1024], curr_dirname[1024];
504 int64_t size;
505 int64_t start_ts, duration, moof_size;
506 if (!os->packets_written)
507 continue;
508
509 snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
510 ret = ffurl_open_whitelist(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist, NULL);
511 if (ret < 0)
512 break;
513 os->cur_start_pos = os->tail_pos;
514 av_write_frame(os->ctx, NULL);
515 avio_flush(os->ctx->pb);
516 os->packets_written = 0;
517 if (!os->out || os->tail_out)
518 return AVERROR(EIO);
519
520 ffurl_closep(&os->out);
521 size = os->tail_pos - os->cur_start_pos;
522 if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
523 break;
524
525 if (!s->streams[i]->codecpar->bit_rate) {
526 int64_t bitrate = (int64_t) size * 8 * AV_TIME_BASE / av_rescale_q(duration, s->streams[i]->time_base, AV_TIME_BASE_Q);
527 if (!bitrate) {
528 av_log(s, AV_LOG_ERROR, "calculating bitrate got zero.\n");
529 ret = AVERROR(EINVAL);
530 return ret;
531 }
532
533 av_log(s, AV_LOG_DEBUG, "calculated bitrate: %"PRId64"\n", bitrate);
534 s->streams[i]->codecpar->bit_rate = bitrate;
535 memcpy(curr_dirname, os->dirname, sizeof(os->dirname));
536 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
537 snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
538
539 // rename the tmp folder back to the correct name since we now have the bitrate
540 if ((ret = ff_rename((const char*)curr_dirname, os->dirname, s)) < 0)
541 return ret;
542 }
543
544 snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
545 snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
546 copy_moof(s, filename, header_filename, moof_size);
547 ret = ff_rename(filename, target_filename, s);
548 if (ret < 0)
549 break;
550 add_fragment(os, target_filename, header_filename, start_ts, duration,
551 os->cur_start_pos, size);
552 }
553
554 if (c->window_size || (final && c->remove_at_exit)) {
555 for (i = 0; i < s->nb_streams; i++) {
556 OutputStream *os = &c->streams[i];
557 int j;
558 int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
559 if (final && c->remove_at_exit)
560 remove = os->nb_fragments;
561 if (remove > 0) {
562 for (j = 0; j < remove; j++) {
563 unlink(os->fragments[j]->file);
564 unlink(os->fragments[j]->infofile);
565 av_freep(&os->fragments[j]);
566 }
567 os->nb_fragments -= remove;
568 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
569 }
570 if (final && c->remove_at_exit)
571 rmdir(os->dirname);
572 }
573 }
574
575 if (ret >= 0)
576 ret = write_manifest(s, final);
577 return ret;
578 }
579
580 static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
581 {
582 SmoothStreamingContext *c = s->priv_data;
583 AVStream *st = s->streams[pkt->stream_index];
584 FFStream *const sti = ffstream(st);
585 OutputStream *os = &c->streams[pkt->stream_index];
586 int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration;
587 int ret;
588
589 if (sti->first_dts == AV_NOPTS_VALUE)
590 sti->first_dts = pkt->dts;
591
592 if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
593 av_compare_ts(pkt->dts - sti->first_dts, st->time_base,
594 end_dts, AV_TIME_BASE_Q) >= 0 &&
595 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
596
597 if ((ret = ism_flush(s, 0)) < 0)
598 return ret;
599 c->nb_fragments++;
600 }
601
602 os->packets_written++;
603 return ff_write_chained(os->ctx, 0, pkt, s, 0);
604 }
605
606 static int ism_write_trailer(AVFormatContext *s)
607 {
608 SmoothStreamingContext *c = s->priv_data;
609 ism_flush(s, 1);
610
611 if (c->remove_at_exit) {
612 char filename[1024];
613 snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
614 unlink(filename);
615 rmdir(s->url);
616 }
617
618 return 0;
619 }
620
621 #define OFFSET(x) offsetof(SmoothStreamingContext, x)
622 #define E AV_OPT_FLAG_ENCODING_PARAM
623 static const AVOption options[] = {
624 { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
625 { "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 },
626 { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
627 { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
628 { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
629 { NULL },
630 };
631
632 static const AVClass ism_class = {
633 .class_name = "smooth streaming muxer",
634 .item_name = av_default_item_name,
635 .option = options,
636 .version = LIBAVUTIL_VERSION_INT,
637 };
638
639
640 const FFOutputFormat ff_smoothstreaming_muxer = {
641 .p.name = "smoothstreaming",
642 .p.long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
643 .p.audio_codec = AV_CODEC_ID_AAC,
644 .p.video_codec = AV_CODEC_ID_H264,
645 .p.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
646 .p.priv_class = &ism_class,
647 .priv_data_size = sizeof(SmoothStreamingContext),
648 .write_header = ism_write_header,
649 .write_packet = ism_write_packet,
650 .write_trailer = ism_write_trailer,
651 .deinit = ism_free,
652 };
653