FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/smoothstreamingenc.c
Date: 2024-02-29 09:57:37
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 #if FF_API_AVIO_WRITE_NONCONST
79 static int ism_write(void *opaque, uint8_t *buf, int buf_size)
80 #else
81 static int ism_write(void *opaque, const uint8_t *buf, int buf_size)
82 #endif
83 {
84 OutputStream *os = opaque;
85 if (os->out)
86 ffurl_write(os->out, buf, buf_size);
87 if (os->out2)
88 ffurl_write(os->out2, buf, buf_size);
89 os->cur_pos += buf_size;
90 if (os->cur_pos >= os->tail_pos)
91 os->tail_pos = os->cur_pos;
92 return buf_size;
93 }
94
95 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
96 {
97 OutputStream *os = opaque;
98 int i;
99 if (whence != SEEK_SET)
100 return AVERROR(ENOSYS);
101 if (os->tail_out) {
102 ffurl_closep(&os->out);
103 ffurl_closep(&os->out2);
104 os->out = os->tail_out;
105 os->tail_out = NULL;
106 }
107 if (offset >= os->cur_start_pos) {
108 if (os->out)
109 ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
110 os->cur_pos = offset;
111 return offset;
112 }
113 for (i = os->nb_fragments - 1; i >= 0; i--) {
114 Fragment *frag = os->fragments[i];
115 if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
116 int ret;
117 AVDictionary *opts = NULL;
118 os->tail_out = os->out;
119 av_dict_set(&opts, "truncate", "0", 0);
120 ret = ffurl_open_whitelist(&os->out, frag->file, AVIO_FLAG_WRITE,
121 &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
122 av_dict_free(&opts);
123 if (ret < 0) {
124 os->out = os->tail_out;
125 os->tail_out = NULL;
126 return ret;
127 }
128 av_dict_set(&opts, "truncate", "0", 0);
129 ffurl_open_whitelist(&os->out2, frag->infofile, AVIO_FLAG_WRITE,
130 &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
131 av_dict_free(&opts);
132 ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
133 if (os->out2)
134 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
135 os->cur_pos = offset;
136 return offset;
137 }
138 }
139 return AVERROR(EIO);
140 }
141
142 static void get_private_data(OutputStream *os)
143 {
144 AVCodecParameters *par = os->ctx->streams[0]->codecpar;
145 uint8_t *ptr = par->extradata;
146 int size = par->extradata_size;
147 int i;
148 if (par->codec_id == AV_CODEC_ID_H264) {
149 ff_avc_write_annexb_extradata(ptr, &ptr, &size);
150 if (!ptr)
151 ptr = par->extradata;
152 }
153 if (!ptr)
154 return;
155 os->private_str = av_mallocz(2*size + 1);
156 if (!os->private_str)
157 goto fail;
158 for (i = 0; i < size; i++)
159 snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
160 fail:
161 if (ptr != par->extradata)
162 av_free(ptr);
163 }
164
165 static void ism_free(AVFormatContext *s)
166 {
167 SmoothStreamingContext *c = s->priv_data;
168 int i, j;
169 if (!c->streams)
170 return;
171 for (i = 0; i < s->nb_streams; i++) {
172 OutputStream *os = &c->streams[i];
173 ffurl_closep(&os->out);
174 ffurl_closep(&os->out2);
175 ffurl_closep(&os->tail_out);
176 if (os->ctx && os->ctx->pb)
177 avio_context_free(&os->ctx->pb);
178 avformat_free_context(os->ctx);
179 av_freep(&os->private_str);
180 for (j = 0; j < os->nb_fragments; j++)
181 av_freep(&os->fragments[j]);
182 av_freep(&os->fragments);
183 }
184 av_freep(&c->streams);
185 }
186
187 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
188 {
189 int removed = 0, i, start = 0;
190 if (os->nb_fragments <= 0)
191 return;
192 if (os->fragments[0]->n > 0)
193 removed = 1;
194 if (final)
195 skip = 0;
196 if (window_size)
197 start = FFMAX(os->nb_fragments - skip - window_size, 0);
198 for (i = start; i < os->nb_fragments - skip; i++) {
199 Fragment *frag = os->fragments[i];
200 if (!final || removed)
201 avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
202 else
203 avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
204 }
205 }
206
207 static int write_manifest(AVFormatContext *s, int final)
208 {
209 SmoothStreamingContext *c = s->priv_data;
210 AVIOContext *out;
211 char filename[1024], temp_filename[1024];
212 int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
213 int64_t duration = 0;
214
215 snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
216 snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->url);
217 ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
218 if (ret < 0) {
219 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
220 return ret;
221 }
222 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
223 for (i = 0; i < s->nb_streams; i++) {
224 OutputStream *os = &c->streams[i];
225 if (os->nb_fragments > 0) {
226 Fragment *last = os->fragments[os->nb_fragments - 1];
227 duration = last->start_time + last->duration;
228 }
229 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
230 video_chunks = os->nb_fragments;
231 video_streams++;
232 } else {
233 audio_chunks = os->nb_fragments;
234 audio_streams++;
235 }
236 }
237 if (!final) {
238 duration = 0;
239 video_chunks = audio_chunks = 0;
240 }
241 if (c->window_size) {
242 video_chunks = FFMIN(video_chunks, c->window_size);
243 audio_chunks = FFMIN(audio_chunks, c->window_size);
244 }
245 avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
246 if (!final)
247 avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
248 avio_printf(out, ">\n");
249 if (c->has_video) {
250 int last = -1, index = 0;
251 avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
252 for (i = 0; i < s->nb_streams; i++) {
253 OutputStream *os = &c->streams[i];
254 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
255 continue;
256 last = i;
257 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);
258 index++;
259 }
260 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
261 avio_printf(out, "</StreamIndex>\n");
262 }
263 if (c->has_audio) {
264 int last = -1, index = 0;
265 avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
266 for (i = 0; i < s->nb_streams; i++) {
267 OutputStream *os = &c->streams[i];
268 if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
269 continue;
270 last = i;
271 avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n",
272 index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate,
273 s->streams[i]->codecpar->ch_layout.nb_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 ff_format_io_close(s, &out);
282 return ff_rename(temp_filename, filename, s);
283 }
284
285 static int ism_write_header(AVFormatContext *s)
286 {
287 SmoothStreamingContext *c = s->priv_data;
288 int ret = 0, i;
289 const AVOutputFormat *oformat;
290
291 if (mkdir(s->url, 0777) == -1 && errno != EEXIST) {
292 av_log(s, AV_LOG_ERROR, "mkdir failed\n");
293 return AVERROR(errno);
294 }
295
296 oformat = av_guess_format("ismv", NULL, NULL);
297 if (!oformat) {
298 return AVERROR_MUXER_NOT_FOUND;
299 }
300
301 c->streams = av_calloc(s->nb_streams, sizeof(*c->streams));
302 if (!c->streams) {
303 return AVERROR(ENOMEM);
304 }
305
306 for (i = 0; i < s->nb_streams; i++) {
307 OutputStream *os = &c->streams[i];
308 AVFormatContext *ctx;
309 AVStream *st;
310 AVDictionary *opts = NULL;
311
312 if (!s->streams[i]->codecpar->bit_rate) {
313 av_log(s, AV_LOG_WARNING, "No bit rate set for stream %d\n", i);
314 // create a tmp name for the directory of fragments
315 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(Tmp_%d)", s->url, i);
316 } else {
317 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
318 }
319
320 if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
321 av_log(s, AV_LOG_ERROR, "mkdir failed\n");
322 return AVERROR(errno);
323 }
324
325 os->ctx = ctx = avformat_alloc_context();
326 if (!ctx) {
327 return AVERROR(ENOMEM);
328 }
329 if ((ret = ff_copy_whiteblacklists(ctx, s)) < 0)
330 return ret;
331 ctx->oformat = oformat;
332 ctx->interrupt_callback = s->interrupt_callback;
333
334 if (!(st = avformat_new_stream(ctx, NULL))) {
335 return AVERROR(ENOMEM);
336 }
337 avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
338 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
339 st->time_base = s->streams[i]->time_base;
340
341 ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), 1, os, NULL, ism_write, ism_seek);
342 if (!ctx->pb) {
343 return AVERROR(ENOMEM);
344 }
345
346 av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
347 av_dict_set(&opts, "movflags", "+frag_custom", 0);
348 ret = avformat_write_header(ctx, &opts);
349 av_dict_free(&opts);
350 if (ret < 0) {
351 return ret;
352 }
353 avio_flush(ctx->pb);
354 s->streams[i]->time_base = st->time_base;
355 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
356 c->has_video = 1;
357 os->stream_type_tag = "video";
358 if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
359 os->fourcc = "H264";
360 } else if (st->codecpar->codec_id == AV_CODEC_ID_VC1) {
361 os->fourcc = "WVC1";
362 } else {
363 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
364 return AVERROR(EINVAL);
365 }
366 } else {
367 c->has_audio = 1;
368 os->stream_type_tag = "audio";
369 if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
370 os->fourcc = "AACL";
371 os->audio_tag = 0xff;
372 } else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
373 os->fourcc = "WMAP";
374 os->audio_tag = 0x0162;
375 } else {
376 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
377 return AVERROR(EINVAL);
378 }
379 os->packet_size = st->codecpar->block_align ? st->codecpar->block_align : 4;
380 }
381 get_private_data(os);
382 }
383
384 if (!c->has_video && c->min_frag_duration <= 0) {
385 av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
386 return AVERROR(EINVAL);
387 }
388 ret = write_manifest(s, 0);
389 if (ret < 0)
390 return ret;
391
392 return 0;
393 }
394
395 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
396 {
397 AVIOContext *in;
398 int ret;
399 uint32_t len;
400 if ((ret = s->io_open(s, &in, filename, AVIO_FLAG_READ, NULL)) < 0)
401 return ret;
402 ret = AVERROR(EIO);
403 *moof_size = avio_rb32(in);
404 if (*moof_size < 8 || *moof_size > size)
405 goto fail;
406 if (avio_rl32(in) != MKTAG('m','o','o','f'))
407 goto fail;
408 len = avio_rb32(in);
409 if (len > *moof_size)
410 goto fail;
411 if (avio_rl32(in) != MKTAG('m','f','h','d'))
412 goto fail;
413 avio_seek(in, len - 8, SEEK_CUR);
414 avio_rb32(in); /* traf size */
415 if (avio_rl32(in) != MKTAG('t','r','a','f'))
416 goto fail;
417 while (avio_tell(in) < *moof_size) {
418 uint32_t len = avio_rb32(in);
419 uint32_t tag = avio_rl32(in);
420 int64_t end = avio_tell(in) + len - 8;
421 if (len < 8 || len >= *moof_size)
422 goto fail;
423 if (tag == MKTAG('u','u','i','d')) {
424 static const AVUUID tfxd = {
425 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
426 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
427 };
428 AVUUID uuid;
429 avio_read(in, uuid, 16);
430 if (av_uuid_equal(uuid, tfxd) && len >= 8 + 16 + 4 + 16) {
431 avio_seek(in, 4, SEEK_CUR);
432 *start_ts = avio_rb64(in);
433 *duration = avio_rb64(in);
434 ret = 0;
435 break;
436 }
437 }
438 avio_seek(in, end, SEEK_SET);
439 }
440 fail:
441 ff_format_io_close(s, &in);
442 return ret;
443 }
444
445 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)
446 {
447 int err;
448 Fragment *frag;
449 if (os->nb_fragments >= os->fragments_size) {
450 os->fragments_size = (os->fragments_size + 1) * 2;
451 if ((err = av_reallocp_array(&os->fragments, sizeof(*os->fragments),
452 os->fragments_size)) < 0) {
453 os->fragments_size = 0;
454 os->nb_fragments = 0;
455 return err;
456 }
457 }
458 frag = av_mallocz(sizeof(*frag));
459 if (!frag)
460 return AVERROR(ENOMEM);
461 av_strlcpy(frag->file, file, sizeof(frag->file));
462 av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
463 frag->start_time = start_time;
464 frag->duration = duration;
465 frag->start_pos = start_pos;
466 frag->size = size;
467 frag->n = os->fragment_index;
468 os->fragments[os->nb_fragments++] = frag;
469 os->fragment_index++;
470 return 0;
471 }
472
473 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
474 {
475 AVIOContext *in, *out;
476 int ret = 0;
477 if ((ret = s->io_open(s, &in, infile, AVIO_FLAG_READ, NULL)) < 0)
478 return ret;
479 if ((ret = s->io_open(s, &out, outfile, AVIO_FLAG_WRITE, NULL)) < 0) {
480 ff_format_io_close(s, &in);
481 return ret;
482 }
483 while (size > 0) {
484 uint8_t buf[8192];
485 int n = FFMIN(size, sizeof(buf));
486 n = avio_read(in, buf, n);
487 if (n <= 0) {
488 ret = AVERROR(EIO);
489 break;
490 }
491 avio_write(out, buf, n);
492 size -= n;
493 }
494 avio_flush(out);
495 ff_format_io_close(s, &out);
496 ff_format_io_close(s, &in);
497 return ret;
498 }
499
500 static int ism_flush(AVFormatContext *s, int final)
501 {
502 SmoothStreamingContext *c = s->priv_data;
503 int i, ret = 0;
504
505 for (i = 0; i < s->nb_streams; i++) {
506 OutputStream *os = &c->streams[i];
507 char filename[1024], target_filename[1024], header_filename[1024], curr_dirname[1024];
508 int64_t size;
509 int64_t start_ts, duration, moof_size;
510 if (!os->packets_written)
511 continue;
512
513 snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
514 ret = ffurl_open_whitelist(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist, NULL);
515 if (ret < 0)
516 break;
517 os->cur_start_pos = os->tail_pos;
518 av_write_frame(os->ctx, NULL);
519 avio_flush(os->ctx->pb);
520 os->packets_written = 0;
521 if (!os->out || os->tail_out)
522 return AVERROR(EIO);
523
524 ffurl_closep(&os->out);
525 size = os->tail_pos - os->cur_start_pos;
526 if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
527 break;
528
529 if (!s->streams[i]->codecpar->bit_rate) {
530 int64_t bitrate = (int64_t) size * 8 * AV_TIME_BASE / av_rescale_q(duration, s->streams[i]->time_base, AV_TIME_BASE_Q);
531 if (!bitrate) {
532 av_log(s, AV_LOG_ERROR, "calculating bitrate got zero.\n");
533 ret = AVERROR(EINVAL);
534 return ret;
535 }
536
537 av_log(s, AV_LOG_DEBUG, "calculated bitrate: %"PRId64"\n", bitrate);
538 s->streams[i]->codecpar->bit_rate = bitrate;
539 memcpy(curr_dirname, os->dirname, sizeof(os->dirname));
540 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
541 snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
542
543 // rename the tmp folder back to the correct name since we now have the bitrate
544 if ((ret = ff_rename((const char*)curr_dirname, os->dirname, s)) < 0)
545 return ret;
546 }
547
548 snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
549 snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
550 copy_moof(s, filename, header_filename, moof_size);
551 ret = ff_rename(filename, target_filename, s);
552 if (ret < 0)
553 break;
554 add_fragment(os, target_filename, header_filename, start_ts, duration,
555 os->cur_start_pos, size);
556 }
557
558 if (c->window_size || (final && c->remove_at_exit)) {
559 for (i = 0; i < s->nb_streams; i++) {
560 OutputStream *os = &c->streams[i];
561 int j;
562 int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
563 if (final && c->remove_at_exit)
564 remove = os->nb_fragments;
565 if (remove > 0) {
566 for (j = 0; j < remove; j++) {
567 unlink(os->fragments[j]->file);
568 unlink(os->fragments[j]->infofile);
569 av_freep(&os->fragments[j]);
570 }
571 os->nb_fragments -= remove;
572 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
573 }
574 if (final && c->remove_at_exit)
575 rmdir(os->dirname);
576 }
577 }
578
579 if (ret >= 0)
580 ret = write_manifest(s, final);
581 return ret;
582 }
583
584 static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
585 {
586 SmoothStreamingContext *c = s->priv_data;
587 AVStream *st = s->streams[pkt->stream_index];
588 FFStream *const sti = ffstream(st);
589 OutputStream *os = &c->streams[pkt->stream_index];
590 int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration;
591 int ret;
592
593 if (sti->first_dts == AV_NOPTS_VALUE)
594 sti->first_dts = pkt->dts;
595
596 if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
597 av_compare_ts(pkt->dts - sti->first_dts, st->time_base,
598 end_dts, AV_TIME_BASE_Q) >= 0 &&
599 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
600
601 if ((ret = ism_flush(s, 0)) < 0)
602 return ret;
603 c->nb_fragments++;
604 }
605
606 os->packets_written++;
607 return ff_write_chained(os->ctx, 0, pkt, s, 0);
608 }
609
610 static int ism_write_trailer(AVFormatContext *s)
611 {
612 SmoothStreamingContext *c = s->priv_data;
613 ism_flush(s, 1);
614
615 if (c->remove_at_exit) {
616 char filename[1024];
617 snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
618 unlink(filename);
619 rmdir(s->url);
620 }
621
622 return 0;
623 }
624
625 #define OFFSET(x) offsetof(SmoothStreamingContext, x)
626 #define E AV_OPT_FLAG_ENCODING_PARAM
627 static const AVOption options[] = {
628 { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
629 { "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 },
630 { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
631 { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
632 { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
633 { NULL },
634 };
635
636 static const AVClass ism_class = {
637 .class_name = "smooth streaming muxer",
638 .item_name = av_default_item_name,
639 .option = options,
640 .version = LIBAVUTIL_VERSION_INT,
641 };
642
643
644 const FFOutputFormat ff_smoothstreaming_muxer = {
645 .p.name = "smoothstreaming",
646 .p.long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
647 .p.audio_codec = AV_CODEC_ID_AAC,
648 .p.video_codec = AV_CODEC_ID_H264,
649 .p.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
650 .p.priv_class = &ism_class,
651 .priv_data_size = sizeof(SmoothStreamingContext),
652 .write_header = ism_write_header,
653 .write_packet = ism_write_packet,
654 .write_trailer = ism_write_trailer,
655 .deinit = ism_free,
656 };
657