3 * Copyright (c) 2011, Luca Barbato
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/log.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/parseutils.h"
31 #include "libavutil/mathematics.h"
33 typedef struct SegmentContext {
34 const AVClass *class; /**< Class for private options. */
36 AVOutputFormat *oformat;
38 char *format; /**< Set by a private option. */
39 char *list; /**< Set by a private option. */
40 char *entry_prefix; /**< Set by a private option. */
41 int list_type; /**< Set by a private option. */
42 float time; /**< Set by a private option. */
43 int size; /**< Set by a private option. */
44 int wrap; /**< Set by a private option. */
45 int individual_header_trailer; /**< Set by a private option. */
46 int write_header_trailer; /**< Set by a private option. */
48 int64_t recording_time;
58 static int segment_mux_init(AVFormatContext *s)
60 SegmentContext *seg = s->priv_data;
64 seg->avf = oc = avformat_alloc_context();
66 return AVERROR(ENOMEM);
68 oc->oformat = seg->oformat;
69 oc->interrupt_callback = s->interrupt_callback;
70 oc->opaque = s->opaque;
71 oc->io_close = s->io_close;
72 oc->io_open = s->io_open;
74 for (i = 0; i < s->nb_streams; i++) {
76 if (!(st = avformat_new_stream(oc, NULL)))
77 return AVERROR(ENOMEM);
78 avcodec_copy_context(st->codec, s->streams[i]->codec);
79 st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
80 st->time_base = s->streams[i]->time_base;
86 static int segment_hls_window(AVFormatContext *s, int last)
88 SegmentContext *seg = s->priv_data;
92 if ((ret = s->io_open(s, &seg->pb, seg->list, AVIO_FLAG_WRITE, NULL)) < 0)
95 avio_printf(seg->pb, "#EXTM3U\n");
96 avio_printf(seg->pb, "#EXT-X-VERSION:3\n");
97 avio_printf(seg->pb, "#EXT-X-TARGETDURATION:%d\n", (int)seg->time);
98 avio_printf(seg->pb, "#EXT-X-MEDIA-SEQUENCE:%d\n",
99 FFMAX(0, seg->number - seg->size));
101 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
102 FFMAX(0, seg->number - seg->size));
104 for (i = FFMAX(0, seg->number - seg->size);
105 i < seg->number; i++) {
106 avio_printf(seg->pb, "#EXTINF:%d,\n", (int)seg->time);
107 if (seg->entry_prefix) {
108 avio_printf(seg->pb, "%s", seg->entry_prefix);
110 ret = av_get_frame_filename(buf, sizeof(buf), s->filename, i);
112 ret = AVERROR(EINVAL);
115 avio_printf(seg->pb, "%s\n", buf);
119 avio_printf(seg->pb, "#EXT-X-ENDLIST\n");
121 ff_format_io_close(s, &seg->pb);
126 static int segment_start(AVFormatContext *s, int write_header)
128 SegmentContext *c = s->priv_data;
129 AVFormatContext *oc = c->avf;
133 avformat_free_context(oc);
135 if ((err = segment_mux_init(s)) < 0)
141 c->number %= c->wrap;
143 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
144 s->filename, c->number++) < 0)
145 return AVERROR(EINVAL);
147 if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
150 if (oc->oformat->priv_class && oc->priv_data)
151 av_opt_set(oc->priv_data, "resend_headers", "1", 0); /* mpegts specific */
154 if ((err = avformat_write_header(oc, NULL)) < 0)
161 static int segment_end(AVFormatContext *oc, int write_trailer)
165 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
167 av_write_trailer(oc);
168 ff_format_io_close(oc, &oc->pb);
173 static int open_null_ctx(AVIOContext **ctx)
175 int buf_size = 32768;
176 uint8_t *buf = av_malloc(buf_size);
178 return AVERROR(ENOMEM);
179 *ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
182 return AVERROR(ENOMEM);
187 static void close_null_ctx(AVIOContext *pb)
193 static void seg_free_context(SegmentContext *seg)
195 ff_format_io_close(seg->avf, &seg->pb);
196 avformat_free_context(seg->avf);
200 static int seg_write_header(AVFormatContext *s)
202 SegmentContext *seg = s->priv_data;
203 AVFormatContext *oc = NULL;
207 seg->offset_time = 0;
208 seg->recording_time = seg->time * 1000000;
209 if (!seg->write_header_trailer)
210 seg->individual_header_trailer = 0;
212 if (seg->list && seg->list_type != LIST_HLS)
213 if ((ret = s->io_open(s, &seg->pb, seg->list, AVIO_FLAG_WRITE, NULL)) < 0)
216 for (i = 0; i < s->nb_streams; i++)
218 (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO);
220 if (seg->has_video > 1)
221 av_log(s, AV_LOG_WARNING,
222 "More than a single video stream present, "
223 "expect issues decoding it.\n");
225 seg->oformat = av_guess_format(seg->format, s->filename, NULL);
228 ret = AVERROR_MUXER_NOT_FOUND;
231 if (seg->oformat->flags & AVFMT_NOFILE) {
232 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
234 ret = AVERROR(EINVAL);
238 if ((ret = segment_mux_init(s)) < 0)
242 if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
243 s->filename, seg->number++) < 0) {
244 ret = AVERROR(EINVAL);
248 if (seg->write_header_trailer) {
249 if ((ret = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
252 if ((ret = open_null_ctx(&oc->pb)) < 0)
256 if ((ret = avformat_write_header(oc, NULL)) < 0) {
257 ff_format_io_close(oc, &oc->pb);
261 if (!seg->write_header_trailer) {
262 close_null_ctx(oc->pb);
263 if ((ret = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, NULL)) < 0)
268 if (seg->list_type == LIST_HLS) {
269 if ((ret = segment_hls_window(s, 0)) < 0)
272 avio_printf(seg->pb, "%s\n", oc->filename);
279 seg_free_context(seg);
284 static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
286 SegmentContext *seg = s->priv_data;
287 AVFormatContext *oc = seg->avf;
288 AVStream *st = s->streams[pkt->stream_index];
289 int64_t end_pts = seg->recording_time * seg->number;
290 int ret, can_split = 1;
293 return AVERROR(EINVAL);
295 if (seg->has_video) {
296 can_split = st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
297 pkt->flags & AV_PKT_FLAG_KEY;
300 if (can_split && av_compare_ts(pkt->pts, st->time_base, end_pts,
301 AV_TIME_BASE_Q) >= 0) {
302 av_log(s, AV_LOG_DEBUG, "Next segment starts at %d %"PRId64"\n",
303 pkt->stream_index, pkt->pts);
305 ret = segment_end(oc, seg->individual_header_trailer);
308 ret = segment_start(s, seg->individual_header_trailer);
316 if (seg->list_type == LIST_HLS) {
317 if ((ret = segment_hls_window(s, 0)) < 0)
320 avio_printf(seg->pb, "%s\n", oc->filename);
322 if (seg->size && !(seg->number % seg->size)) {
323 ff_format_io_close(s, &seg->pb);
324 if ((ret = s->io_open(s, &seg->pb, seg->list,
325 AVIO_FLAG_WRITE, NULL)) < 0)
332 ret = ff_write_chained(oc, pkt->stream_index, pkt, s);
336 seg_free_context(seg);
341 static int seg_write_trailer(struct AVFormatContext *s)
343 SegmentContext *seg = s->priv_data;
344 AVFormatContext *oc = seg->avf;
350 if (!seg->write_header_trailer) {
351 if ((ret = segment_end(oc, 0)) < 0)
353 if ((ret = open_null_ctx(&oc->pb)) < 0)
355 ret = av_write_trailer(oc);
356 close_null_ctx(oc->pb);
358 ret = segment_end(oc, 1);
364 if (seg->list && seg->list_type == LIST_HLS) {
365 if ((ret = segment_hls_window(s, 1) < 0))
370 ff_format_io_close(s, &seg->pb);
371 avformat_free_context(oc);
375 #define OFFSET(x) offsetof(SegmentContext, x)
376 #define E AV_OPT_FLAG_ENCODING_PARAM
377 static const AVOption options[] = {
378 { "segment_format", "container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
379 { "segment_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E },
380 { "segment_list", "output the segment list", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
381 { "segment_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E },
382 { "segment_list_type", "segment list format", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_FLAT}, 0, 2, E, "list_type" },
383 { "flat", "plain list (default)", 0, AV_OPT_TYPE_CONST, {.i64 = LIST_FLAT}, 0, 0, E, "list_type" },
384 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64 = LIST_HLS}, 0, 0, E, "list_type" },
385 { "segment_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
386 { "segment_list_entry_prefix", "base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
387 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
388 { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
392 static const AVClass seg_class = {
393 .class_name = "segment muxer",
394 .item_name = av_default_item_name,
396 .version = LIBAVUTIL_VERSION_INT,
400 AVOutputFormat ff_segment_muxer = {
402 .long_name = NULL_IF_CONFIG_SMALL("segment"),
403 .priv_data_size = sizeof(SegmentContext),
404 .flags = AVFMT_NOFILE,
405 .write_header = seg_write_header,
406 .write_packet = seg_write_packet,
407 .write_trailer = seg_write_trailer,
408 .priv_class = &seg_class,