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
24 #include <float.h>
25
26 #include "avformat.h"
27 #include "internal.h"
28 #include "os_support.h"
29
30 #if HAVE_UNISTD_H
31 #include <unistd.h>
32 #endif
33
34 #include "avc.h"
35 #include "url.h"
36 #include "isom.h"
37
38 #include "libavutil/opt.h"
39 #include "libavutil/avstring.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/intreadwrite.h"
42
43 typedef struct {
44 char file[1024];
45 char infofile[1024];
46 int64_t start_time, duration;
47 int n;
48 int64_t start_pos, size;
49 } Fragment;
50
51 typedef struct {
52 AVFormatContext *ctx;
53 int ctx_inited;
54 char dirname[1024];
55 uint8_t iobuf[32768];
56 URLContext *out; // Current output stream where all output is written
57 URLContext *out2; // Auxiliary output stream where all output is also written
58 URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
59 int64_t tail_pos, cur_pos, cur_start_pos;
60 int packets_written;
61 const char *stream_type_tag;
62 int nb_fragments, fragments_size, fragment_index;
63 Fragment **fragments;
64
65 const char *fourcc;
66 char *private_str;
67 int packet_size;
68 int audio_tag;
69 } OutputStream;
70
71 typedef struct {
72 const AVClass *class; /* Class for private options. */
73 int window_size;
74 int extra_window_size;
75 int lookahead_count;
76 int min_frag_duration;
77 int remove_at_exit;
78 OutputStream *streams;
79 int has_video, has_audio;
80 int nb_fragments;
81 } SmoothStreamingContext;
82
ism_write(void * opaque,uint8_t * buf,int buf_size)83 static int ism_write(void *opaque, uint8_t *buf, int buf_size)
84 {
85 OutputStream *os = opaque;
86 if (os->out)
87 ffurl_write(os->out, buf, buf_size);
88 if (os->out2)
89 ffurl_write(os->out2, buf, buf_size);
90 os->cur_pos += buf_size;
91 if (os->cur_pos >= os->tail_pos)
92 os->tail_pos = os->cur_pos;
93 return buf_size;
94 }
95
ism_seek(void * opaque,int64_t offset,int whence)96 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
97 {
98 OutputStream *os = opaque;
99 int i;
100 if (whence != SEEK_SET)
101 return AVERROR(ENOSYS);
102 if (os->tail_out) {
103 if (os->out) {
104 ffurl_close(os->out);
105 }
106 if (os->out2) {
107 ffurl_close(os->out2);
108 }
109 os->out = os->tail_out;
110 os->out2 = NULL;
111 os->tail_out = NULL;
112 }
113 if (offset >= os->cur_start_pos) {
114 if (os->out)
115 ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
116 os->cur_pos = offset;
117 return offset;
118 }
119 for (i = os->nb_fragments - 1; i >= 0; i--) {
120 Fragment *frag = os->fragments[i];
121 if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
122 int ret;
123 AVDictionary *opts = NULL;
124 os->tail_out = os->out;
125 av_dict_set(&opts, "truncate", "0", 0);
126 ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
127 av_dict_free(&opts);
128 if (ret < 0) {
129 os->out = os->tail_out;
130 os->tail_out = NULL;
131 return ret;
132 }
133 av_dict_set(&opts, "truncate", "0", 0);
134 ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
135 av_dict_free(&opts);
136 ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
137 if (os->out2)
138 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
139 os->cur_pos = offset;
140 return offset;
141 }
142 }
143 return AVERROR(EIO);
144 }
145
get_private_data(OutputStream * os)146 static void get_private_data(OutputStream *os)
147 {
148 AVCodecContext *codec = os->ctx->streams[0]->codec;
149 uint8_t *ptr = codec->extradata;
150 int size = codec->extradata_size;
151 int i;
152 if (codec->codec_id == AV_CODEC_ID_H264) {
153 ff_avc_write_annexb_extradata(ptr, &ptr, &size);
154 if (!ptr)
155 ptr = codec->extradata;
156 }
157 if (!ptr)
158 return;
159 os->private_str = av_mallocz(2*size + 1);
160 if (!os->private_str)
161 goto fail;
162 for (i = 0; i < size; i++)
163 snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
164 fail:
165 if (ptr != codec->extradata)
166 av_free(ptr);
167 }
168
ism_free(AVFormatContext * s)169 static void ism_free(AVFormatContext *s)
170 {
171 SmoothStreamingContext *c = s->priv_data;
172 int i, j;
173 if (!c->streams)
174 return;
175 for (i = 0; i < s->nb_streams; i++) {
176 OutputStream *os = &c->streams[i];
177 ffurl_close(os->out);
178 ffurl_close(os->out2);
179 ffurl_close(os->tail_out);
180 os->out = os->out2 = os->tail_out = NULL;
181 if (os->ctx && os->ctx_inited)
182 av_write_trailer(os->ctx);
183 if (os->ctx && os->ctx->pb)
184 av_free(os->ctx->pb);
185 if (os->ctx)
186 avformat_free_context(os->ctx);
187 av_free(os->private_str);
188 for (j = 0; j < os->nb_fragments; j++)
189 av_free(os->fragments[j]);
190 av_free(os->fragments);
191 }
192 av_freep(&c->streams);
193 }
194
output_chunk_list(OutputStream * os,AVIOContext * out,int final,int skip,int window_size)195 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
196 {
197 int removed = 0, i, start = 0;
198 if (os->nb_fragments <= 0)
199 return;
200 if (os->fragments[0]->n > 0)
201 removed = 1;
202 if (final)
203 skip = 0;
204 if (window_size)
205 start = FFMAX(os->nb_fragments - skip - window_size, 0);
206 for (i = start; i < os->nb_fragments - skip; i++) {
207 Fragment *frag = os->fragments[i];
208 if (!final || removed)
209 avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
210 else
211 avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
212 }
213 }
214
write_manifest(AVFormatContext * s,int final)215 static int write_manifest(AVFormatContext *s, int final)
216 {
217 SmoothStreamingContext *c = s->priv_data;
218 AVIOContext *out;
219 char filename[1024], temp_filename[1024];
220 int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
221 int64_t duration = 0;
222
223 snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
224 snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename);
225 ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
226 if (ret < 0) {
227 av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
228 return ret;
229 }
230 avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
231 for (i = 0; i < s->nb_streams; i++) {
232 OutputStream *os = &c->streams[i];
233 if (os->nb_fragments > 0) {
234 Fragment *last = os->fragments[os->nb_fragments - 1];
235 duration = last->start_time + last->duration;
236 }
237 if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
238 video_chunks = os->nb_fragments;
239 video_streams++;
240 } else {
241 audio_chunks = os->nb_fragments;
242 audio_streams++;
243 }
244 }
245 if (!final) {
246 duration = 0;
247 video_chunks = audio_chunks = 0;
248 }
249 if (c->window_size) {
250 video_chunks = FFMIN(video_chunks, c->window_size);
251 audio_chunks = FFMIN(audio_chunks, c->window_size);
252 }
253 avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
254 if (!final)
255 avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
256 avio_printf(out, ">\n");
257 if (c->has_video) {
258 int last = -1, index = 0;
259 avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
260 for (i = 0; i < s->nb_streams; i++) {
261 OutputStream *os = &c->streams[i];
262 if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
263 continue;
264 last = i;
265 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);
266 index++;
267 }
268 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
269 avio_printf(out, "</StreamIndex>\n");
270 }
271 if (c->has_audio) {
272 int last = -1, index = 0;
273 avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
274 for (i = 0; i < s->nb_streams; i++) {
275 OutputStream *os = &c->streams[i];
276 if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
277 continue;
278 last = i;
279 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);
280 index++;
281 }
282 output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
283 avio_printf(out, "</StreamIndex>\n");
284 }
285 avio_printf(out, "</SmoothStreamingMedia>\n");
286 avio_flush(out);
287 avio_close(out);
288 rename(temp_filename, filename);
289 return 0;
290 }
291
ism_write_header(AVFormatContext * s)292 static int ism_write_header(AVFormatContext *s)
293 {
294 SmoothStreamingContext *c = s->priv_data;
295 int ret = 0, i;
296 AVOutputFormat *oformat;
297
298 if (mkdir(s->filename, 0777) == -1 && errno != EEXIST) {
299 av_log(s, AV_LOG_ERROR, "mkdir failed\n");
300 ret = AVERROR(errno);
301 goto fail;
302 }
303
304 oformat = av_guess_format("ismv", NULL, NULL);
305 if (!oformat) {
306 ret = AVERROR_MUXER_NOT_FOUND;
307 goto fail;
308 }
309
310 c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams));
311 if (!c->streams) {
312 ret = AVERROR(ENOMEM);
313 goto fail;
314 }
315
316 for (i = 0; i < s->nb_streams; i++) {
317 OutputStream *os = &c->streams[i];
318 AVFormatContext *ctx;
319 AVStream *st;
320 AVDictionary *opts = NULL;
321
322 if (!s->streams[i]->codec->bit_rate) {
323 av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
324 ret = AVERROR(EINVAL);
325 goto fail;
326 }
327 snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);
328 if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
329 ret = AVERROR(errno);
330 av_log(s, AV_LOG_ERROR, "mkdir failed\n");
331 goto fail;
332 }
333
334 ctx = avformat_alloc_context();
335 if (!ctx) {
336 ret = AVERROR(ENOMEM);
337 goto fail;
338 }
339 os->ctx = ctx;
340 ctx->oformat = oformat;
341 ctx->interrupt_callback = s->interrupt_callback;
342
343 if (!(st = avformat_new_stream(ctx, NULL))) {
344 ret = AVERROR(ENOMEM);
345 goto fail;
346 }
347 avcodec_copy_context(st->codec, s->streams[i]->codec);
348 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
349
350 ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);
351 if (!ctx->pb) {
352 ret = AVERROR(ENOMEM);
353 goto fail;
354 }
355
356 av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
357 av_dict_set(&opts, "movflags", "frag_custom", 0);
358 if ((ret = avformat_write_header(ctx, &opts)) < 0) {
359 goto fail;
360 }
361 os->ctx_inited = 1;
362 avio_flush(ctx->pb);
363 av_dict_free(&opts);
364 s->streams[i]->time_base = st->time_base;
365 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
366 c->has_video = 1;
367 os->stream_type_tag = "video";
368 if (st->codec->codec_id == AV_CODEC_ID_H264) {
369 os->fourcc = "H264";
370 } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {
371 os->fourcc = "WVC1";
372 } else {
373 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
374 ret = AVERROR(EINVAL);
375 goto fail;
376 }
377 } else {
378 c->has_audio = 1;
379 os->stream_type_tag = "audio";
380 if (st->codec->codec_id == AV_CODEC_ID_AAC) {
381 os->fourcc = "AACL";
382 os->audio_tag = 0xff;
383 } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {
384 os->fourcc = "WMAP";
385 os->audio_tag = 0x0162;
386 } else {
387 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
388 ret = AVERROR(EINVAL);
389 goto fail;
390 }
391 os->packet_size = st->codec->block_align ? st->codec->block_align : 4;
392 }
393 get_private_data(os);
394 }
395
396 if (!c->has_video && c->min_frag_duration <= 0) {
397 av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
398 ret = AVERROR(EINVAL);
399 }
400 ret = write_manifest(s, 0);
401
402 fail:
403 if (ret)
404 ism_free(s);
405 return ret;
406 }
407
parse_fragment(AVFormatContext * s,const char * filename,int64_t * start_ts,int64_t * duration,int64_t * moof_size,int64_t size)408 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
409 {
410 AVIOContext *in;
411 int ret;
412 uint32_t len;
413 if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
414 return ret;
415 ret = AVERROR(EIO);
416 *moof_size = avio_rb32(in);
417 if (*moof_size < 8 || *moof_size > size)
418 goto fail;
419 if (avio_rl32(in) != MKTAG('m','o','o','f'))
420 goto fail;
421 len = avio_rb32(in);
422 if (len > *moof_size)
423 goto fail;
424 if (avio_rl32(in) != MKTAG('m','f','h','d'))
425 goto fail;
426 avio_seek(in, len - 8, SEEK_CUR);
427 avio_rb32(in); /* traf size */
428 if (avio_rl32(in) != MKTAG('t','r','a','f'))
429 goto fail;
430 while (avio_tell(in) < *moof_size) {
431 uint32_t len = avio_rb32(in);
432 uint32_t tag = avio_rl32(in);
433 int64_t end = avio_tell(in) + len - 8;
434 if (len < 8 || len >= *moof_size)
435 goto fail;
436 if (tag == MKTAG('u','u','i','d')) {
437 static const uint8_t tfxd[] = {
438 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
439 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
440 };
441 uint8_t uuid[16];
442 avio_read(in, uuid, 16);
443 if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {
444 avio_seek(in, 4, SEEK_CUR);
445 *start_ts = avio_rb64(in);
446 *duration = avio_rb64(in);
447 ret = 0;
448 break;
449 }
450 }
451 avio_seek(in, end, SEEK_SET);
452 }
453 fail:
454 avio_close(in);
455 return ret;
456 }
457
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 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)
459 {
460 int err;
461 Fragment *frag;
462 if (os->nb_fragments >= os->fragments_size) {
463 os->fragments_size = (os->fragments_size + 1) * 2;
464 if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) *
465 os->fragments_size)) < 0) {
466 os->fragments_size = 0;
467 os->nb_fragments = 0;
468 return err;
469 }
470 }
471 frag = av_mallocz(sizeof(*frag));
472 if (!frag)
473 return AVERROR(ENOMEM);
474 av_strlcpy(frag->file, file, sizeof(frag->file));
475 av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
476 frag->start_time = start_time;
477 frag->duration = duration;
478 frag->start_pos = start_pos;
479 frag->size = size;
480 frag->n = os->fragment_index;
481 os->fragments[os->nb_fragments++] = frag;
482 os->fragment_index++;
483 return 0;
484 }
485
copy_moof(AVFormatContext * s,const char * infile,const char * outfile,int64_t size)486 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
487 {
488 AVIOContext *in, *out;
489 int ret = 0;
490 if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
491 return ret;
492 if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {
493 avio_close(in);
494 return ret;
495 }
496 while (size > 0) {
497 uint8_t buf[8192];
498 int n = FFMIN(size, sizeof(buf));
499 n = avio_read(in, buf, n);
500 if (n <= 0) {
501 ret = AVERROR(EIO);
502 break;
503 }
504 avio_write(out, buf, n);
505 size -= n;
506 }
507 avio_flush(out);
508 avio_close(out);
509 avio_close(in);
510 return ret;
511 }
512
ism_flush(AVFormatContext * s,int final)513 static int ism_flush(AVFormatContext *s, int final)
514 {
515 SmoothStreamingContext *c = s->priv_data;
516 int i, ret = 0;
517
518 for (i = 0; i < s->nb_streams; i++) {
519 OutputStream *os = &c->streams[i];
520 char filename[1024], target_filename[1024], header_filename[1024];
521 int64_t start_pos = os->tail_pos, size;
522 int64_t start_ts, duration, moof_size;
523 if (!os->packets_written)
524 continue;
525
526 snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
527 ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
528 if (ret < 0)
529 break;
530 os->cur_start_pos = os->tail_pos;
531 av_write_frame(os->ctx, NULL);
532 avio_flush(os->ctx->pb);
533 os->packets_written = 0;
534 if (!os->out || os->tail_out)
535 return AVERROR(EIO);
536
537 ffurl_close(os->out);
538 os->out = NULL;
539 size = os->tail_pos - start_pos;
540 if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
541 break;
542 snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
543 snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
544 copy_moof(s, filename, header_filename, moof_size);
545 rename(filename, target_filename);
546 add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size);
547 }
548
549 if (c->window_size || (final && c->remove_at_exit)) {
550 for (i = 0; i < s->nb_streams; i++) {
551 OutputStream *os = &c->streams[i];
552 int j;
553 int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
554 if (final && c->remove_at_exit)
555 remove = os->nb_fragments;
556 if (remove > 0) {
557 for (j = 0; j < remove; j++) {
558 unlink(os->fragments[j]->file);
559 unlink(os->fragments[j]->infofile);
560 av_free(os->fragments[j]);
561 }
562 os->nb_fragments -= remove;
563 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
564 }
565 if (final && c->remove_at_exit)
566 rmdir(os->dirname);
567 }
568 }
569
570 if (ret >= 0)
571 ret = write_manifest(s, final);
572 return ret;
573 }
574
ism_write_packet(AVFormatContext * s,AVPacket * pkt)575 static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
576 {
577 SmoothStreamingContext *c = s->priv_data;
578 AVStream *st = s->streams[pkt->stream_index];
579 OutputStream *os = &c->streams[pkt->stream_index];
580 int64_t end_dts = (c->nb_fragments + LLN(1)) * c->min_frag_duration;
581 int ret;
582
583 if (st->first_dts == AV_NOPTS_VALUE)
584 st->first_dts = pkt->dts;
585
586 if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
587 av_compare_ts(pkt->dts - st->first_dts, st->time_base,
588 end_dts, AV_TIME_BASE_Q) >= 0 &&
589 pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
590
591 if ((ret = ism_flush(s, 0)) < 0)
592 return ret;
593 c->nb_fragments++;
594 }
595
596 os->packets_written++;
597 return ff_write_chained(os->ctx, 0, pkt, s, 0);
598 }
599
ism_write_trailer(AVFormatContext * s)600 static int ism_write_trailer(AVFormatContext *s)
601 {
602 SmoothStreamingContext *c = s->priv_data;
603 ism_flush(s, 1);
604
605 if (c->remove_at_exit) {
606 char filename[1024];
607 snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
608 unlink(filename);
609 rmdir(s->filename);
610 }
611
612 ism_free(s);
613 return 0;
614 }
615
616 #define OFFSET(x) offsetof(SmoothStreamingContext, x)
617 #define E AV_OPT_FLAG_ENCODING_PARAM
618 static const AVOption options[] = {
619 { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
620 { "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 },
621 { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
622 { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
623 { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
624 { NULL },
625 };
626
627 static const AVClass ism_class = {
628 .class_name = "smooth streaming muxer",
629 .item_name = av_default_item_name,
630 .option = options,
631 .version = LIBAVUTIL_VERSION_INT,
632 };
633
634 AVOutputFormat ff_smoothstreaming_muxer = {
635 .name = "smoothstreaming",
636 .long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
637 .priv_data_size = sizeof(SmoothStreamingContext),
638 .audio_codec = AV_CODEC_ID_AAC,
639 .video_codec = AV_CODEC_ID_H264,
640 .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
641 .write_header = ism_write_header,
642 .write_packet = ism_write_packet,
643 .write_trailer = ism_write_trailer,
644 .codec_tag = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },
645 .priv_class = &ism_class,
646 };
647