FFmpeg coverage

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/mem.h"
35			#include "libavutil/opt.h"
36			#include "libavutil/avstring.h"
37			#include "libavutil/mathematics.h"
38			#include "libavutil/uuid.h"
39
40			typedef struct Fragment {
41			int64_t start_time, duration;
42			int n;
43			int64_t start_pos, size;
44			char file[1024];
45			char infofile[1024];
46			} Fragment;
47
48			typedef struct OutputStream {
49			AVFormatContext *ctx;
50			URLContext *out; // Current output stream where all output is written
51			URLContext *out2; // Auxiliary output stream where all output is also written
52			URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
53			int64_t tail_pos, cur_pos, cur_start_pos;
54			int packets_written;
55			const char *stream_type_tag;
56			int nb_fragments, fragments_size, fragment_index;
57			Fragment **fragments;
58
59			const char *fourcc;
60			char *private_str;
61			int packet_size;
62			int audio_tag;
63			char dirname[1024];
64			uint8_t iobuf[32768];
65			} OutputStream;
66
67			typedef struct SmoothStreamingContext {
68			const AVClass *class; /* Class for private options. */
69			int window_size;
70			int extra_window_size;
71			int lookahead_count;
72			int min_frag_duration;
73			int remove_at_exit;
74			OutputStream *streams;
75			int has_video, has_audio;
76			int nb_fragments;
77			} SmoothStreamingContext;
78
79		✗	static int ism_write(void *opaque, const uint8_t *buf, int buf_size)
80			{
81		✗	OutputStream *os = opaque;
82		✗	if (os->out)
83		✗	ffurl_write(os->out, buf, buf_size);
84		✗	if (os->out2)
85		✗	ffurl_write(os->out2, buf, buf_size);
86		✗	os->cur_pos += buf_size;
87		✗	if (os->cur_pos >= os->tail_pos)
88		✗	os->tail_pos = os->cur_pos;
89		✗	return buf_size;
90			}
91
92		✗	static int64_t ism_seek(void *opaque, int64_t offset, int whence)
93			{
94		✗	OutputStream *os = opaque;
95			int i;
96		✗	if (whence != SEEK_SET)
97		✗	return AVERROR(ENOSYS);
98		✗	if (os->tail_out) {
99		✗	ffurl_closep(&os->out);
100		✗	ffurl_closep(&os->out2);
101		✗	os->out = os->tail_out;
102		✗	os->tail_out = NULL;
103			}
104		✗	if (offset >= os->cur_start_pos) {
105		✗	if (os->out)
106		✗	ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
107		✗	os->cur_pos = offset;
108		✗	return offset;
109			}
110		✗	for (i = os->nb_fragments - 1; i >= 0; i--) {
111		✗	Fragment *frag = os->fragments[i];
112		✗	if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
113			int ret;
114		✗	AVDictionary *opts = NULL;
115		✗	os->tail_out = os->out;
116		✗	av_dict_set(&opts, "truncate", "0", 0);
117		✗	ret = ffurl_open_whitelist(&os->out, frag->file, AVIO_FLAG_WRITE,
118		✗	&os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
119		✗	av_dict_free(&opts);
120		✗	if (ret < 0) {
121		✗	os->out = os->tail_out;
122		✗	os->tail_out = NULL;
123		✗	return ret;
124			}
125		✗	av_dict_set(&opts, "truncate", "0", 0);
126		✗	ffurl_open_whitelist(&os->out2, frag->infofile, AVIO_FLAG_WRITE,
127		✗	&os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
128		✗	av_dict_free(&opts);
129		✗	ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
130		✗	if (os->out2)
131		✗	ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
132		✗	os->cur_pos = offset;
133		✗	return offset;
134			}
135			}
136		✗	return AVERROR(EIO);
137			}
138
139		✗	static void get_private_data(OutputStream *os)
140			{
141		✗	AVCodecParameters *par = os->ctx->streams[0]->codecpar;
142		✗	uint8_t *ptr = par->extradata;
143		✗	int size = par->extradata_size;
144			int i;
145		✗	if (par->codec_id == AV_CODEC_ID_H264) {
146		✗	ff_avc_write_annexb_extradata(ptr, &ptr, &size);
147		✗	if (!ptr)
148		✗	ptr = par->extradata;
149			}
150		✗	if (!ptr)
151		✗	return;
152		✗	os->private_str = av_mallocz(2*size + 1);
153		✗	if (!os->private_str)
154		✗	goto fail;
155		✗	for (i = 0; i < size; i++)
156		✗	snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
157		✗	fail:
158		✗	if (ptr != par->extradata)
159		✗	av_free(ptr);
160			}
161
162		✗	static void ism_free(AVFormatContext *s)
163			{
164		✗	SmoothStreamingContext *c = s->priv_data;
165			int i, j;
166		✗	if (!c->streams)
167		✗	return;
168		✗	for (i = 0; i < s->nb_streams; i++) {
169		✗	OutputStream *os = &c->streams[i];
170		✗	ffurl_closep(&os->out);
171		✗	ffurl_closep(&os->out2);
172		✗	ffurl_closep(&os->tail_out);
173		✗	if (os->ctx && os->ctx->pb)
174		✗	avio_context_free(&os->ctx->pb);
175		✗	avformat_free_context(os->ctx);
176		✗	av_freep(&os->private_str);
177		✗	for (j = 0; j < os->nb_fragments; j++)
178		✗	av_freep(&os->fragments[j]);
179		✗	av_freep(&os->fragments);
180			}
181		✗	av_freep(&c->streams);
182			}
183
184		✗	static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
185			{
186		✗	int removed = 0, i, start = 0;
187		✗	if (os->nb_fragments <= 0)
188		✗	return;
189		✗	if (os->fragments[0]->n > 0)
190		✗	removed = 1;
191		✗	if (final)
192		✗	skip = 0;
193		✗	if (window_size)
194		✗	start = FFMAX(os->nb_fragments - skip - window_size, 0);
195		✗	for (i = start; i < os->nb_fragments - skip; i++) {
196		✗	Fragment *frag = os->fragments[i];
197		✗	if (!final || removed)
198		✗	avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
199			else
200		✗	avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
201			}
202			}
203
204		✗	static int write_manifest(AVFormatContext *s, int final)
205			{
206		✗	SmoothStreamingContext *c = s->priv_data;
207			AVIOContext *out;
208			char filename[1024], temp_filename[1024];
209		✗	int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
210		✗	int64_t duration = 0;
211
212		✗	snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
213		✗	snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->url);
214		✗	ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
215		✗	if (ret < 0) {
216		✗	av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
217		✗	return ret;
218			}
219		✗	avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
220		✗	for (i = 0; i < s->nb_streams; i++) {
221		✗	OutputStream *os = &c->streams[i];
222		✗	if (os->nb_fragments > 0) {
223		✗	Fragment *last = os->fragments[os->nb_fragments - 1];
224		✗	duration = last->start_time + last->duration;
225			}
226		✗	if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
227		✗	video_chunks = os->nb_fragments;
228		✗	video_streams++;
229			} else {
230		✗	audio_chunks = os->nb_fragments;
231		✗	audio_streams++;
232			}
233			}
234		✗	if (!final) {
235		✗	duration = 0;
236		✗	video_chunks = audio_chunks = 0;
237			}
238		✗	if (c->window_size) {
239		✗	video_chunks = FFMIN(video_chunks, c->window_size);
240		✗	audio_chunks = FFMIN(audio_chunks, c->window_size);
241			}
242		✗	avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
243		✗	if (!final)
244		✗	avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
245		✗	avio_printf(out, ">\n");
246		✗	if (c->has_video) {
247		✗	int last = -1, index = 0;
248		✗	avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
249		✗	for (i = 0; i < s->nb_streams; i++) {
250		✗	OutputStream *os = &c->streams[i];
251		✗	if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
252		✗	continue;
253		✗	last = i;
254		✗	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);
255		✗	index++;
256			}
257		✗	output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
258		✗	avio_printf(out, "</StreamIndex>\n");
259			}
260		✗	if (c->has_audio) {
261		✗	int last = -1, index = 0;
262		✗	avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
263		✗	for (i = 0; i < s->nb_streams; i++) {
264		✗	OutputStream *os = &c->streams[i];
265		✗	if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
266		✗	continue;
267		✗	last = i;
268		✗	avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n",
269		✗	index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate,
270		✗	s->streams[i]->codecpar->ch_layout.nb_channels, os->packet_size, os->audio_tag, os->private_str);
271		✗	index++;
272			}
273		✗	output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
274		✗	avio_printf(out, "</StreamIndex>\n");
275			}
276		✗	avio_printf(out, "</SmoothStreamingMedia>\n");
277		✗	avio_flush(out);
278		✗	ff_format_io_close(s, &out);
279		✗	return ff_rename(temp_filename, filename, s);
280			}
281
282		✗	static int ism_write_header(AVFormatContext *s)
283			{
284		✗	SmoothStreamingContext *c = s->priv_data;
285		✗	int ret = 0, i;
286			const AVOutputFormat *oformat;
287
288		✗	if (mkdir(s->url, 0777) == -1 && errno != EEXIST) {
289		✗	av_log(s, AV_LOG_ERROR, "mkdir failed\n");
290		✗	return AVERROR(errno);
291			}
292
293		✗	oformat = av_guess_format("ismv", NULL, NULL);
294		✗	if (!oformat) {
295		✗	return AVERROR_MUXER_NOT_FOUND;
296			}
297
298		✗	c->streams = av_calloc(s->nb_streams, sizeof(*c->streams));
299		✗	if (!c->streams) {
300		✗	return AVERROR(ENOMEM);
301			}
302
303		✗	for (i = 0; i < s->nb_streams; i++) {
304		✗	OutputStream *os = &c->streams[i];
305			AVFormatContext *ctx;
306			AVStream *st;
307		✗	AVDictionary *opts = NULL;
308
309		✗	if (!s->streams[i]->codecpar->bit_rate) {
310		✗	av_log(s, AV_LOG_WARNING, "No bit rate set for stream %d\n", i);
311			// create a tmp name for the directory of fragments
312		✗	snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(Tmp_%d)", s->url, i);
313			} else {
314		✗	snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
315			}
316
317		✗	if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
318		✗	av_log(s, AV_LOG_ERROR, "mkdir failed\n");
319		✗	return AVERROR(errno);
320			}
321
322		✗	os->ctx = ctx = avformat_alloc_context();
323		✗	if (!ctx) {
324		✗	return AVERROR(ENOMEM);
325			}
326		✗	if ((ret = ff_copy_whiteblacklists(ctx, s)) < 0)
327		✗	return ret;
328		✗	ctx->oformat = oformat;
329		✗	ctx->interrupt_callback = s->interrupt_callback;
330
331		✗	if (!(st = avformat_new_stream(ctx, NULL))) {
332		✗	return AVERROR(ENOMEM);
333			}
334		✗	avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
335		✗	st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
336		✗	st->time_base = s->streams[i]->time_base;
337
338		✗	ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), 1, os, NULL, ism_write, ism_seek);
339		✗	if (!ctx->pb) {
340		✗	return AVERROR(ENOMEM);
341			}
342
343		✗	av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
344		✗	av_dict_set(&opts, "movflags", "+frag_custom", 0);
345		✗	ret = avformat_write_header(ctx, &opts);
346		✗	av_dict_free(&opts);
347		✗	if (ret < 0) {
348		✗	return ret;
349			}
350		✗	avio_flush(ctx->pb);
351		✗	s->streams[i]->time_base = st->time_base;
352		✗	if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
353		✗	c->has_video = 1;
354		✗	os->stream_type_tag = "video";
355		✗	if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
356		✗	os->fourcc = "H264";
357		✗	} else if (st->codecpar->codec_id == AV_CODEC_ID_VC1) {
358		✗	os->fourcc = "WVC1";
359			} else {
360		✗	av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
361		✗	return AVERROR(EINVAL);
362			}
363			} else {
364		✗	c->has_audio = 1;
365		✗	os->stream_type_tag = "audio";
366		✗	if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
367		✗	os->fourcc = "AACL";
368		✗	os->audio_tag = 0xff;
369		✗	} else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
370		✗	os->fourcc = "WMAP";
371		✗	os->audio_tag = 0x0162;
372			} else {
373		✗	av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
374		✗	return AVERROR(EINVAL);
375			}
376		✗	os->packet_size = st->codecpar->block_align ? st->codecpar->block_align : 4;
377			}
378		✗	get_private_data(os);
379			}
380
381		✗	if (!c->has_video && c->min_frag_duration <= 0) {
382		✗	av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
383		✗	return AVERROR(EINVAL);
384			}
385		✗	ret = write_manifest(s, 0);
386		✗	if (ret < 0)
387		✗	return ret;
388
389		✗	return 0;
390			}
391
392		✗	static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
393			{
394			AVIOContext *in;
395			int ret;
396			uint32_t len;
397		✗	if ((ret = s->io_open(s, &in, filename, AVIO_FLAG_READ, NULL)) < 0)
398		✗	return ret;
399		✗	ret = AVERROR(EIO);
400		✗	*moof_size = avio_rb32(in);
401		✗	if (*moof_size < 8 || *moof_size > size)
402		✗	goto fail;
403		✗	if (avio_rl32(in) != MKTAG('m','o','o','f'))
404		✗	goto fail;
405		✗	len = avio_rb32(in);
406		✗	if (len > *moof_size)
407		✗	goto fail;
408		✗	if (avio_rl32(in) != MKTAG('m','f','h','d'))
409		✗	goto fail;
410		✗	avio_seek(in, len - 8, SEEK_CUR);
411		✗	avio_rb32(in); /* traf size */
412		✗	if (avio_rl32(in) != MKTAG('t','r','a','f'))
413		✗	goto fail;
414		✗	while (avio_tell(in) < *moof_size) {
415		✗	uint32_t len = avio_rb32(in);
416		✗	uint32_t tag = avio_rl32(in);
417		✗	int64_t end = avio_tell(in) + len - 8;
418		✗	if (len < 8 || len >= *moof_size)
419		✗	goto fail;
420		✗	if (tag == MKTAG('u','u','i','d')) {
421			static const AVUUID tfxd = {
422			0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
423			0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
424			};
425			AVUUID uuid;
426		✗	avio_read(in, uuid, 16);
427		✗	if (av_uuid_equal(uuid, tfxd) && len >= 8 + 16 + 4 + 16) {
428		✗	avio_seek(in, 4, SEEK_CUR);
429		✗	*start_ts = avio_rb64(in);
430		✗	*duration = avio_rb64(in);
431		✗	ret = 0;
432		✗	break;
433			}
434			}
435		✗	avio_seek(in, end, SEEK_SET);
436			}
437		✗	fail:
438		✗	ff_format_io_close(s, &in);
439		✗	return ret;
440			}
441
442		✗	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)
443			{
444			int err;
445			Fragment *frag;
446		✗	if (os->nb_fragments >= os->fragments_size) {
447		✗	os->fragments_size = (os->fragments_size + 1) * 2;
448		✗	if ((err = av_reallocp_array(&os->fragments, sizeof(*os->fragments),
449		✗	os->fragments_size)) < 0) {
450		✗	os->fragments_size = 0;
451		✗	os->nb_fragments = 0;
452		✗	return err;
453			}
454			}
455		✗	frag = av_mallocz(sizeof(*frag));
456		✗	if (!frag)
457		✗	return AVERROR(ENOMEM);
458		✗	av_strlcpy(frag->file, file, sizeof(frag->file));
459		✗	av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
460		✗	frag->start_time = start_time;
461		✗	frag->duration = duration;
462		✗	frag->start_pos = start_pos;
463		✗	frag->size = size;
464		✗	frag->n = os->fragment_index;
465		✗	os->fragments[os->nb_fragments++] = frag;
466		✗	os->fragment_index++;
467		✗	return 0;
468			}
469
470		✗	static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
471			{
472			AVIOContext *in, *out;
473		✗	int ret = 0;
474		✗	if ((ret = s->io_open(s, &in, infile, AVIO_FLAG_READ, NULL)) < 0)
475		✗	return ret;
476		✗	if ((ret = s->io_open(s, &out, outfile, AVIO_FLAG_WRITE, NULL)) < 0) {
477		✗	ff_format_io_close(s, &in);
478		✗	return ret;
479			}
480		✗	while (size > 0) {
481			uint8_t buf[8192];
482		✗	int n = FFMIN(size, sizeof(buf));
483		✗	n = avio_read(in, buf, n);
484		✗	if (n <= 0) {
485		✗	ret = AVERROR(EIO);
486		✗	break;
487			}
488		✗	avio_write(out, buf, n);
489		✗	size -= n;
490			}
491		✗	avio_flush(out);
492		✗	ff_format_io_close(s, &out);
493		✗	ff_format_io_close(s, &in);
494		✗	return ret;
495			}
496
497		✗	static int ism_flush(AVFormatContext *s, int final)
498			{
499		✗	SmoothStreamingContext *c = s->priv_data;
500		✗	int i, ret = 0;
501
502		✗	for (i = 0; i < s->nb_streams; i++) {
503		✗	OutputStream *os = &c->streams[i];
504			char filename[1024], target_filename[1024], header_filename[1024], curr_dirname[1024];
505			int64_t size;
506			int64_t start_ts, duration, moof_size;
507		✗	if (!os->packets_written)
508		✗	continue;
509
510		✗	snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
511		✗	ret = ffurl_open_whitelist(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist, NULL);
512		✗	if (ret < 0)
513		✗	break;
514		✗	os->cur_start_pos = os->tail_pos;
515		✗	av_write_frame(os->ctx, NULL);
516		✗	avio_flush(os->ctx->pb);
517		✗	os->packets_written = 0;
518		✗	if (!os->out || os->tail_out)
519		✗	return AVERROR(EIO);
520
521		✗	ffurl_closep(&os->out);
522		✗	size = os->tail_pos - os->cur_start_pos;
523		✗	if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
524		✗	break;
525
526		✗	if (!s->streams[i]->codecpar->bit_rate) {
527		✗	int64_t bitrate = (int64_t) size * 8 * AV_TIME_BASE / av_rescale_q(duration, s->streams[i]->time_base, AV_TIME_BASE_Q);
528		✗	if (!bitrate) {
529		✗	av_log(s, AV_LOG_ERROR, "calculating bitrate got zero.\n");
530		✗	ret = AVERROR(EINVAL);
531		✗	return ret;
532			}
533
534		✗	av_log(s, AV_LOG_DEBUG, "calculated bitrate: %"PRId64"\n", bitrate);
535		✗	s->streams[i]->codecpar->bit_rate = bitrate;
536		✗	memcpy(curr_dirname, os->dirname, sizeof(os->dirname));
537		✗	snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
538		✗	snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
539
540			// rename the tmp folder back to the correct name since we now have the bitrate
541		✗	if ((ret = ff_rename((const char*)curr_dirname, os->dirname, s)) < 0)
542		✗	return ret;
543			}
544
545		✗	snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
546		✗	snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
547		✗	copy_moof(s, filename, header_filename, moof_size);
548		✗	ret = ff_rename(filename, target_filename, s);
549		✗	if (ret < 0)
550		✗	break;
551		✗	add_fragment(os, target_filename, header_filename, start_ts, duration,
552			os->cur_start_pos, size);
553			}
554
555		✗	if (c->window_size || (final && c->remove_at_exit)) {
556		✗	for (i = 0; i < s->nb_streams; i++) {
557		✗	OutputStream *os = &c->streams[i];
558			int j;
559		✗	int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
560		✗	if (final && c->remove_at_exit)
561		✗	remove = os->nb_fragments;
562		✗	if (remove > 0) {
563		✗	for (j = 0; j < remove; j++) {
564		✗	unlink(os->fragments[j]->file);
565		✗	unlink(os->fragments[j]->infofile);
566		✗	av_freep(&os->fragments[j]);
567			}
568		✗	os->nb_fragments -= remove;
569		✗	memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
570			}
571		✗	if (final && c->remove_at_exit)
572		✗	rmdir(os->dirname);
573			}
574			}
575
576		✗	if (ret >= 0)
577		✗	ret = write_manifest(s, final);
578		✗	return ret;
579			}
580
581		✗	static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
582			{
583		✗	SmoothStreamingContext *c = s->priv_data;
584		✗	AVStream *st = s->streams[pkt->stream_index];
585		✗	FFStream *const sti = ffstream(st);
586		✗	OutputStream *os = &c->streams[pkt->stream_index];
587		✗	int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration;
588			int ret;
589
590		✗	if (sti->first_dts == AV_NOPTS_VALUE)
591		✗	sti->first_dts = pkt->dts;
592
593		✗	if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
594		✗	av_compare_ts(pkt->dts - sti->first_dts, st->time_base,
595		✗	end_dts, AV_TIME_BASE_Q) >= 0 &&
596		✗	pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
597
598		✗	if ((ret = ism_flush(s, 0)) < 0)
599		✗	return ret;
600		✗	c->nb_fragments++;
601			}
602
603		✗	os->packets_written++;
604		✗	return ff_write_chained(os->ctx, 0, pkt, s, 0);
605			}
606
607		✗	static int ism_write_trailer(AVFormatContext *s)
608			{
609		✗	SmoothStreamingContext *c = s->priv_data;
610		✗	ism_flush(s, 1);
611
612		✗	if (c->remove_at_exit) {
613			char filename[1024];
614		✗	snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
615		✗	unlink(filename);
616		✗	rmdir(s->url);
617			}
618
619		✗	return 0;
620			}
621
622			#define OFFSET(x) offsetof(SmoothStreamingContext, x)
623			#define E AV_OPT_FLAG_ENCODING_PARAM
624			static const AVOption options[] = {
625			{ "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
626			{ "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 },
627			{ "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
628			{ "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
629			{ "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
630			{ NULL },
631			};
632
633			static const AVClass ism_class = {
634			.class_name = "smooth streaming muxer",
635			.item_name = av_default_item_name,
636			.option = options,
637			.version = LIBAVUTIL_VERSION_INT,
638			};
639
640
641			const FFOutputFormat ff_smoothstreaming_muxer = {
642			.p.name = "smoothstreaming",
643			.p.long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
644			.p.audio_codec = AV_CODEC_ID_AAC,
645			.p.video_codec = AV_CODEC_ID_H264,
646			.p.flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
647			.p.priv_class = &ism_class,
648			.priv_data_size = sizeof(SmoothStreamingContext),
649			.write_header = ism_write_header,
650			.write_packet = ism_write_packet,
651			.write_trailer = ism_write_trailer,
652			.deinit = ism_free,
653			};
654