FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2015, Vignesh Venkatasubramanian
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			/**
22			* @file WebM Chunk Muxer
23			* The chunk muxer enables writing WebM Live chunks where there is a header
24			* chunk, followed by data chunks where each Cluster is written out as a Chunk.
25			*/
26
27			#include "avformat.h"
28			#include "avio.h"
29			#include "avio_internal.h"
30			#include "internal.h"
31			#include "mux.h"
32
33			#include "libavutil/bprint.h"
34			#include "libavutil/log.h"
35			#include "libavutil/mem.h"
36			#include "libavutil/opt.h"
37			#include "libavutil/mathematics.h"
38
39			typedef struct WebMChunkContext {
40			const AVClass *class;
41			char *header_filename;
42			int chunk_duration;
43			int chunk_index;
44			char *http_method;
45			uint64_t duration_written;
46			int64_t prev_pts;
47			AVFormatContext *avf;
48			int header_written;
49			} WebMChunkContext;
50
51		✗	static int webm_chunk_init(AVFormatContext *s)
52			{
53		✗	WebMChunkContext *wc = s->priv_data;
54			const AVOutputFormat *oformat;
55			AVFormatContext *oc;
56		✗	AVStream *st, *ost = s->streams[0];
57		✗	AVDictionary *dict = NULL;
58			int ret;
59
60			// DASH Streams can only have one track per file.
61		✗	if (s->nb_streams != 1)
62		✗	return AVERROR(EINVAL);
63
64		✗	if (!wc->header_filename) {
65		✗	av_log(s, AV_LOG_ERROR, "No header filename provided\n");
66		✗	return AVERROR(EINVAL);
67			}
68
69		✗	wc->prev_pts = AV_NOPTS_VALUE;
70
71		✗	oformat = av_guess_format("webm", s->url, "video/webm");
72		✗	if (!oformat)
73		✗	return AVERROR_MUXER_NOT_FOUND;
74
75		✗	ret = avformat_alloc_output_context2(&wc->avf, oformat, NULL, NULL);
76		✗	if (ret < 0)
77		✗	return ret;
78		✗	oc = wc->avf;
79
80		✗	ff_format_set_url(oc, wc->header_filename);
81		✗	wc->header_filename = NULL;
82
83		✗	oc->interrupt_callback = s->interrupt_callback;
84		✗	oc->max_delay = s->max_delay;
85		✗	oc->flags = s->flags & ~AVFMT_FLAG_FLUSH_PACKETS;
86		✗	oc->strict_std_compliance = s->strict_std_compliance;
87		✗	oc->avoid_negative_ts = s->avoid_negative_ts;
88
89		✗	oc->flush_packets = 0;
90
91		✗	if ((ret = av_dict_copy(&oc->metadata, s->metadata, 0)) < 0)
92		✗	return ret;
93
94		✗	st = ff_stream_clone(oc, ost);
95		✗	if (!st)
96		✗	return AVERROR(ENOMEM);
97
98		✗	if (wc->http_method)
99		✗	if ((ret = av_dict_set(&dict, "method", wc->http_method, 0)) < 0)
100		✗	return ret;
101		✗	ret = s->io_open(s, &oc->pb, oc->url, AVIO_FLAG_WRITE, &dict);
102		✗	av_dict_free(&dict);
103		✗	if (ret < 0)
104		✗	return ret;
105		✗	oc->pb->seekable = 0;
106
107		✗	if ((ret = av_dict_set_int(&dict, "dash", 1, 0)) < 0 ||
108		✗	(ret = av_dict_set_int(&dict, "cluster_time_limit",
109		✗	wc->chunk_duration, 0)) < 0 ||
110		✗	(ret = av_dict_set_int(&dict, "live", 1, 0)) < 0)
111		✗	goto fail;
112
113		✗	ret = avformat_init_output(oc, &dict);
114		✗	fail:
115		✗	av_dict_free(&dict);
116		✗	if (ret < 0)
117		✗	return ret;
118
119			// Copy the timing info back to the original stream
120			// so that the timestamps of the packets are directly usable
121		✗	avpriv_set_pts_info(ost, st->pts_wrap_bits, st->time_base.num,
122		✗	st->time_base.den);
123
124			// This ensures that the timestamps will already be properly shifted
125			// when the packets arrive here, so we don't need to shift again.
126		✗	s->avoid_negative_ts = oc->avoid_negative_ts;
127		✗	ffformatcontext(s)->avoid_negative_ts_use_pts =
128		✗	ffformatcontext(oc)->avoid_negative_ts_use_pts;
129		✗	oc->avoid_negative_ts = AVFMT_AVOID_NEG_TS_DISABLED;
130		✗	ffformatcontext(oc)->avoid_negative_ts_status = AVOID_NEGATIVE_TS_DISABLED;
131
132		✗	return 0;
133			}
134
135		✗	static int get_chunk_filename(AVFormatContext *s, AVBPrint *filename)
136			{
137		✗	WebMChunkContext *wc = s->priv_data;
138		✗	int ret = ff_bprint_get_frame_filename(filename, s->url, wc->chunk_index - 1, 0);
139		✗	if (ret < 0) {
140		✗	av_log(s, AV_LOG_ERROR, "Invalid chunk filename template '%s'\n", s->url);
141		✗	return ret;
142			}
143		✗	return 0;
144			}
145
146		✗	static int webm_chunk_write_header(AVFormatContext *s)
147			{
148		✗	WebMChunkContext *wc = s->priv_data;
149		✗	AVFormatContext *oc = wc->avf;
150		✗	AVStream *st = s->streams[0], *ost = oc->streams[0];
151			int ret;
152
153		✗	ret = avformat_write_header(oc, NULL);
154		✗	ff_format_io_close(s, &oc->pb);
155		✗	ffstream(st)->lowest_ts_allowed = ffstream(ost)->lowest_ts_allowed;
156		✗	ffstream(ost)->lowest_ts_allowed = 0;
157		✗	wc->header_written = 1;
158		✗	if (ret < 0)
159		✗	return ret;
160		✗	return 0;
161			}
162
163		✗	static int chunk_start(AVFormatContext *s)
164			{
165		✗	WebMChunkContext *wc = s->priv_data;
166		✗	AVFormatContext *oc = wc->avf;
167			int ret;
168
169		✗	ret = avio_open_dyn_buf(&oc->pb);
170		✗	if (ret < 0)
171		✗	return ret;
172		✗	wc->chunk_index++;
173		✗	return 0;
174			}
175
176		✗	static int chunk_end(AVFormatContext *s, int flush)
177			{
178		✗	WebMChunkContext *wc = s->priv_data;
179		✗	AVFormatContext *oc = wc->avf;
180			int ret;
181			int buffer_size;
182			uint8_t *buffer;
183			AVIOContext *pb;
184			AVBPrint filename;
185		✗	AVDictionary *options = NULL;
186
187		✗	if (!oc->pb)
188		✗	return 0;
189
190		✗	if (flush)
191			// Flush the cluster in WebM muxer.
192		✗	av_write_frame(oc, NULL);
193		✗	buffer_size = avio_close_dyn_buf(oc->pb, &buffer);
194		✗	oc->pb = NULL;
195		✗	av_bprint_init(&filename, 0, AV_BPRINT_SIZE_UNLIMITED);
196		✗	ret = get_chunk_filename(s, &filename);
197		✗	if (ret < 0)
198		✗	goto fail;
199		✗	if (wc->http_method)
200		✗	if ((ret = av_dict_set(&options, "method", wc->http_method, 0)) < 0)
201		✗	goto fail;
202		✗	ret = s->io_open(s, &pb, filename.str, AVIO_FLAG_WRITE, &options);
203		✗	av_dict_free(&options);
204		✗	if (ret < 0)
205		✗	goto fail;
206		✗	avio_write(pb, buffer, buffer_size);
207		✗	ff_format_io_close(s, &pb);
208		✗	fail:
209		✗	av_bprint_finalize(&filename, NULL);
210		✗	av_free(buffer);
211		✗	return (ret < 0) ? ret : 0;
212			}
213
214		✗	static int webm_chunk_write_packet(AVFormatContext *s, AVPacket *pkt)
215			{
216		✗	WebMChunkContext *wc = s->priv_data;
217		✗	AVFormatContext *oc = wc->avf;
218		✗	AVStream *st = s->streams[pkt->stream_index];
219			int ret;
220
221		✗	if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
222		✗	if (wc->prev_pts != AV_NOPTS_VALUE)
223		✗	wc->duration_written += av_rescale_q(pkt->pts - wc->prev_pts,
224			st->time_base,
225		✗	(AVRational) {1, 1000});
226		✗	wc->prev_pts = pkt->pts;
227			}
228
229			// For video, a new chunk is started only on key frames. For audio, a new
230			// chunk is started based on chunk_duration. Also, a new chunk is started
231			// unconditionally if there is no currently open chunk.
232		✗	if (!oc->pb || (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
233		✗	(pkt->flags & AV_PKT_FLAG_KEY)) ||
234		✗	(st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
235		✗	wc->duration_written >= wc->chunk_duration)) {
236		✗	wc->duration_written = 0;
237		✗	if ((ret = chunk_end(s, 1)) < 0 || (ret = chunk_start(s)) < 0) {
238		✗	return ret;
239			}
240			}
241
242			// We only have one stream, so use the non-interleaving av_write_frame.
243		✗	return av_write_frame(oc, pkt);
244			}
245
246		✗	static int webm_chunk_write_trailer(AVFormatContext *s)
247			{
248		✗	WebMChunkContext *wc = s->priv_data;
249		✗	AVFormatContext *oc = wc->avf;
250			int ret;
251
252		✗	if (!oc->pb) {
253		✗	ret = chunk_start(s);
254		✗	if (ret < 0)
255		✗	return ret;
256			}
257		✗	ret = av_write_trailer(oc);
258		✗	if (ret < 0)
259		✗	return ret;
260		✗	return chunk_end(s, 0);
261			}
262
263		✗	static void webm_chunk_deinit(AVFormatContext *s)
264			{
265		✗	WebMChunkContext *wc = s->priv_data;
266
267		✗	if (!wc->avf)
268		✗	return;
269
270		✗	if (wc->header_written)
271		✗	ffio_free_dyn_buf(&wc->avf->pb);
272			else
273		✗	ff_format_io_close(s, &wc->avf->pb);
274		✗	avformat_free_context(wc->avf);
275		✗	wc->avf = NULL;
276			}
277
278			#define OFFSET(x) offsetof(WebMChunkContext, x)
279			static const AVOption options[] = {
280			{ "chunk_start_index", "start index of the chunk", OFFSET(chunk_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
281			{ "header", "filename of the header where the initialization data will be written", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
282			{ "audio_chunk_duration", "duration of each chunk in milliseconds", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 5000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
283			{ "method", "set the HTTP method", OFFSET(http_method), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
284			{ NULL },
285			};
286
287			static const AVClass webm_chunk_class = {
288			.class_name = "WebM Chunk Muxer",
289			.item_name = av_default_item_name,
290			.option = options,
291			.version = LIBAVUTIL_VERSION_INT,
292			};
293
294			const FFOutputFormat ff_webm_chunk_muxer = {
295			.p.name = "webm_chunk",
296			.p.long_name = NULL_IF_CONFIG_SMALL("WebM Chunk Muxer"),
297			.p.mime_type = "video/webm",
298			.p.extensions = "chk",
299			.p.flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER | AVFMT_NEEDNUMBER |
300			AVFMT_TS_NONSTRICT,
301			.p.priv_class = &webm_chunk_class,
302			.priv_data_size = sizeof(WebMChunkContext),
303			.init = webm_chunk_init,
304			.write_header = webm_chunk_write_header,
305			.write_packet = webm_chunk_write_packet,
306			.write_trailer = webm_chunk_write_trailer,
307			.deinit = webm_chunk_deinit,
308			};
309