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/attributes_internal.h"
35			#include "libavutil/mem.h"
36			#include "libavutil/opt.h"
37			#include "libavutil/avstring.h"
38			#include "libavutil/mathematics.h"
39			#include "libavutil/uuid.h"
40
41			typedef struct Fragment {
42			int64_t start_time, duration;
43			int n;
44			int64_t start_pos, size;
45			char file[1024];
46			char infofile[1024];
47			} Fragment;
48
49			typedef struct OutputStream {
50			AVFormatContext *ctx;
51			URLContext *out; // Current output stream where all output is written
52			URLContext *out2; // Auxiliary output stream where all output is also written
53			URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
54			int64_t tail_pos, cur_pos, cur_start_pos;
55			int packets_written;
56			const char *stream_type_tag;
57			int nb_fragments, fragments_size, fragment_index;
58			Fragment **fragments;
59
60			const char *fourcc;
61			char *private_str;
62			int packet_size;
63			int audio_tag;
64			char dirname[1024];
65			uint8_t iobuf[32768];
66			} OutputStream;
67
68			typedef struct SmoothStreamingContext {
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;
79
80		✗	static int ism_write(void *opaque, const 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			}
92
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		✗	ffurl_closep(&os->out);
101		✗	ffurl_closep(&os->out2);
102		✗	os->out = os->tail_out;
103		✗	os->tail_out = NULL;
104			}
105		✗	if (offset >= os->cur_start_pos) {
106		✗	if (os->out)
107		✗	ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
108		✗	os->cur_pos = offset;
109		✗	return offset;
110			}
111		✗	for (i = os->nb_fragments - 1; i >= 0; i--) {
112		✗	Fragment *frag = os->fragments[i];
113		✗	if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
114			int ret;
115		✗	AVDictionary *opts = NULL;
116		✗	os->tail_out = os->out;
117		✗	av_dict_set(&opts, "truncate", "0", 0);
118		✗	ret = ffurl_open_whitelist(&os->out, frag->file, AVIO_FLAG_WRITE,
119		✗	&os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
120		✗	av_dict_free(&opts);
121		✗	if (ret < 0) {
122		✗	os->out = os->tail_out;
123		✗	os->tail_out = NULL;
124		✗	return ret;
125			}
126		✗	av_dict_set(&opts, "truncate", "0", 0);
127		✗	ffurl_open_whitelist(&os->out2, frag->infofile, AVIO_FLAG_WRITE,
128		✗	&os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
129		✗	av_dict_free(&opts);
130		✗	ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
131		✗	if (os->out2)
132		✗	ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
133		✗	os->cur_pos = offset;
134		✗	return offset;
135			}
136			}
137		✗	return AVERROR(EIO);
138			}
139
140		✗	static void get_private_data(OutputStream *os)
141			{
142		✗	AVCodecParameters *par = os->ctx->streams[0]->codecpar;
143		✗	uint8_t *ptr = par->extradata;
144		✗	int size = par->extradata_size;
145			int i;
146		✗	if (par->codec_id == AV_CODEC_ID_H264) {
147		✗	ff_avc_write_annexb_extradata(ptr, &ptr, &size);
148		✗	if (!ptr)
149		✗	ptr = par->extradata;
150			}
151		✗	if (!ptr)
152		✗	return;
153		✗	os->private_str = av_mallocz(2*size + 1);
154		✗	if (!os->private_str)
155		✗	goto fail;
156		✗	for (i = 0; i < size; i++)
157		✗	snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
158		✗	fail:
159		✗	if (ptr != par->extradata)
160		✗	av_free(ptr);
161			}
162
163		✗	static void ism_free(AVFormatContext *s)
164			{
165		✗	SmoothStreamingContext *c = s->priv_data;
166			int i, j;
167		✗	if (!c->streams)
168		✗	return;
169		✗	for (i = 0; i < s->nb_streams; i++) {
170		✗	OutputStream *os = &c->streams[i];
171		✗	ffurl_closep(&os->out);
172		✗	ffurl_closep(&os->out2);
173		✗	ffurl_closep(&os->tail_out);
174		✗	if (os->ctx && os->ctx->pb)
175		✗	avio_context_free(&os->ctx->pb);
176		✗	avformat_free_context(os->ctx);
177		✗	av_freep(&os->private_str);
178		✗	for (j = 0; j < os->nb_fragments; j++)
179		✗	av_freep(&os->fragments[j]);
180		✗	av_freep(&os->fragments);
181			}
182		✗	av_freep(&c->streams);
183			}
184
185		✗	static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
186			{
187		✗	int removed = 0, i, start = 0;
188		✗	if (os->nb_fragments <= 0)
189		✗	return;
190		✗	if (os->fragments[0]->n > 0)
191		✗	removed = 1;
192		✗	if (final)
193		✗	skip = 0;
194		✗	if (window_size)
195		✗	start = FFMAX(os->nb_fragments - skip - window_size, 0);
196		✗	for (i = start; i < os->nb_fragments - skip; i++) {
197		✗	Fragment *frag = os->fragments[i];
198		✗	if (!final || removed)
199		✗	avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
200			else
201		✗	avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
202			}
203			}
204
205		✗	static int write_manifest(AVFormatContext *s, int final)
206			{
207		✗	SmoothStreamingContext *c = s->priv_data;
208			AVIOContext *out;
209			char filename[1024], temp_filename[1024];
210		✗	int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
211		✗	int64_t duration = 0;
212
213		✗	snprintf(filename, sizeof(filename), "%s/Manifest", s->url);
214		✗	snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->url);
215		✗	ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
216		✗	if (ret < 0) {
217		✗	av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
218		✗	return ret;
219			}
220		✗	avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
221		✗	for (i = 0; i < s->nb_streams; i++) {
222		✗	OutputStream *os = &c->streams[i];
223		✗	if (os->nb_fragments > 0) {
224		✗	Fragment *last = os->fragments[os->nb_fragments - 1];
225		✗	duration = last->start_time + last->duration;
226			}
227		✗	if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
228		✗	video_chunks = os->nb_fragments;
229		✗	video_streams++;
230			} else {
231		✗	audio_chunks = os->nb_fragments;
232		✗	audio_streams++;
233			}
234			}
235		✗	if (!final) {
236		✗	duration = 0;
237		✗	video_chunks = audio_chunks = 0;
238			}
239		✗	if (c->window_size) {
240		✗	video_chunks = FFMIN(video_chunks, c->window_size);
241		✗	audio_chunks = FFMIN(audio_chunks, c->window_size);
242			}
243		✗	avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
244		✗	if (!final)
245		✗	avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
246		✗	avio_printf(out, ">\n");
247		✗	if (c->has_video) {
248		✗	int last = -1, index = 0;
249		✗	avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
250		✗	for (i = 0; i < s->nb_streams; i++) {
251		✗	OutputStream *os = &c->streams[i];
252		✗	if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
253		✗	continue;
254		✗	last = i;
255		✗	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);
256		✗	index++;
257			}
258		✗	output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
259		✗	avio_printf(out, "</StreamIndex>\n");
260			}
261		✗	if (c->has_audio) {
262		✗	int last = -1, index = 0;
263		✗	avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
264		✗	for (i = 0; i < s->nb_streams; i++) {
265		✗	OutputStream *os = &c->streams[i];
266		✗	if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
267		✗	continue;
268		✗	last = i;
269		✗	avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n",
270		✗	index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate,
271		✗	s->streams[i]->codecpar->ch_layout.nb_channels, os->packet_size, os->audio_tag, os->private_str);
272		✗	index++;
273			}
274		✗	output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
275		✗	avio_printf(out, "</StreamIndex>\n");
276			}
277		✗	avio_printf(out, "</SmoothStreamingMedia>\n");
278		✗	avio_flush(out);
279		✗	ff_format_io_close(s, &out);
280		✗	return ff_rename(temp_filename, filename, s);
281			}
282
283		✗	static int ism_write_header(AVFormatContext *s)
284			{
285		✗	SmoothStreamingContext *c = s->priv_data;
286		✗	int ret = 0, i;
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
294		✗	c->streams = av_calloc(s->nb_streams, sizeof(*c->streams));
295		✗	if (!c->streams) {
296		✗	return AVERROR(ENOMEM);
297			}
298
299		✗	for (i = 0; i < s->nb_streams; i++) {
300		✗	OutputStream *os = &c->streams[i];
301			AVFormatContext *ctx;
302			AVStream *st;
303		✗	AVDictionary *opts = NULL;
304
305		✗	if (!s->streams[i]->codecpar->bit_rate) {
306		✗	av_log(s, AV_LOG_WARNING, "No bit rate set for stream %d\n", i);
307			// create a tmp name for the directory of fragments
308		✗	snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(Tmp_%d)", s->url, i);
309			} else {
310		✗	snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->url, s->streams[i]->codecpar->bit_rate);
311			}
312
313		✗	if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
314		✗	av_log(s, AV_LOG_ERROR, "mkdir failed\n");
315		✗	return AVERROR(errno);
316			}
317
318		✗	os->ctx = ctx = avformat_alloc_context();
319		✗	if (!ctx) {
320		✗	return AVERROR(ENOMEM);
321			}
322		✗	if ((ret = ff_copy_whiteblacklists(ctx, s)) < 0)
323		✗	return ret;
324			EXTERN const FFOutputFormat ff_ismv_muxer;
325		✗	ctx->oformat = &ff_ismv_muxer.p;
326		✗	ctx->interrupt_callback = s->interrupt_callback;
327
328		✗	if (!(st = avformat_new_stream(ctx, NULL))) {
329		✗	return AVERROR(ENOMEM);
330			}
331		✗	if ((ret = avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar)) < 0) {
332		✗	return ret;
333			}
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