2 * FFM (ffserver live feed) muxer
3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/intfloat.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/parseutils.h"
26 #include "libavutil/opt.h"
31 static void flush_packet(AVFormatContext *s)
33 FFMContext *ffm = s->priv_data;
35 AVIOContext *pb = s->pb;
37 fill_size = ffm->packet_end - ffm->packet_ptr;
38 memset(ffm->packet_ptr, 0, fill_size);
40 av_assert1(avio_tell(pb) % ffm->packet_size == 0);
43 avio_wb16(pb, PACKET_ID);
44 avio_wb16(pb, fill_size);
45 avio_wb64(pb, ffm->dts);
46 h = ffm->frame_offset;
47 if (ffm->first_packet)
50 avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
53 /* prepare next packet */
54 ffm->frame_offset = 0; /* no key frame */
55 ffm->packet_ptr = ffm->packet;
56 ffm->first_packet = 0;
59 /* 'first' is true if first data of a frame */
60 static void ffm_write_data(AVFormatContext *s,
61 const uint8_t *buf, int size,
62 int64_t dts, int header)
64 FFMContext *ffm = s->priv_data;
67 if (header && ffm->frame_offset == 0) {
68 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
72 /* write as many packets as needed */
74 len = ffm->packet_end - ffm->packet_ptr;
77 memcpy(ffm->packet_ptr, buf, len);
79 ffm->packet_ptr += len;
82 if (ffm->packet_ptr >= ffm->packet_end)
87 static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
90 int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
92 avio_wb32(pb, dyn_size);
93 avio_write(pb, dyn_buf, dyn_size);
97 static int ffm_write_header_codec_private_ctx(AVFormatContext *s, AVCodecContext *ctx, int type)
99 AVIOContext *pb = s->pb;
103 const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
106 av_log(s, AV_LOG_WARNING, "Stream codec is not found. Codec private options are not stored.\n");
109 if (ctx->priv_data && enc->priv_class && enc->priv_data_size) {
110 if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type,
111 AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0)
113 if (buf && strlen(buf)) {
114 if (avio_open_dyn_buf(&tmp) < 0) {
116 return AVERROR(ENOMEM);
118 avio_put_str(tmp, buf);
119 write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
126 static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type)
131 int ret, need_coma = 0;
133 #define SKIP_DEFAULTS AV_OPT_SERIALIZE_SKIP_DEFAULTS
134 #define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT
135 #define ENC AV_OPT_FLAG_ENCODING_PARAM
137 if (avio_open_dyn_buf(&tmp) < 0)
138 return AVERROR(ENOMEM);
139 if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0)
141 if (buf && strlen(buf)) {
142 avio_write(tmp, buf, strlen(buf));
146 if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0)
148 if (buf && strlen(buf)) {
151 avio_write(tmp, buf, strlen(buf));
155 write_header_chunk(pb, tmp, tag);
159 avio_close_dyn_buf(tmp, &p);
164 #undef OPT_FLAGS_EXACT
168 static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag,
169 const char *configuration)
172 const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
174 AVDictionaryEntry *t = NULL;
175 AVDictionary *all = NULL, *comm = NULL, *prv = NULL;
178 if (!enc || !enc->priv_class || !enc->priv_data_size) {
179 /* codec is not known/has no private options, so save everything as common options */
180 if (avio_open_dyn_buf(&tmp) < 0)
181 return AVERROR(ENOMEM);
182 avio_put_str(tmp, configuration);
183 write_header_chunk(pb, tmp, tag);
187 if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0)
190 while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) {
191 if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
192 if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0)
194 } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0)
199 if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 ||
200 (ret = avio_open_dyn_buf(&tmp)) < 0)
202 avio_put_str(tmp, buf);
204 write_header_chunk(pb, tmp, tag);
207 if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 ||
208 (ret = avio_open_dyn_buf(&tmp)) < 0)
210 avio_put_str(tmp, buf);
211 write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
222 static int ffm_write_header(AVFormatContext *s)
224 FFMContext *ffm = s->priv_data;
225 AVDictionaryEntry *t;
227 AVIOContext *pb = s->pb;
228 AVCodecContext *codec;
229 int bit_rate, i, ret;
231 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
232 ret = av_parse_time(&ffm->start_time, t->value, 0);
237 ffm->packet_size = FFM_PACKET_SIZE;
240 avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
241 avio_wb32(pb, ffm->packet_size);
242 avio_wb64(pb, 0); /* current write position */
244 if(avio_open_dyn_buf(&pb) < 0)
245 return AVERROR(ENOMEM);
247 avio_wb32(pb, s->nb_streams);
249 for(i=0;i<s->nb_streams;i++) {
251 bit_rate += st->codec->bit_rate;
253 avio_wb32(pb, bit_rate);
255 write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
257 /* list of streams */
258 for(i=0;i<s->nb_streams;i++) {
260 avpriv_set_pts_info(st, 64, 1, 1000000);
261 if(avio_open_dyn_buf(&pb) < 0)
262 return AVERROR(ENOMEM);
266 avio_wb32(pb, codec->codec_id);
267 avio_w8(pb, codec->codec_type);
268 avio_wb32(pb, codec->bit_rate);
269 avio_wb32(pb, codec->flags);
270 avio_wb32(pb, codec->flags2);
271 avio_wb32(pb, codec->debug);
272 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
273 avio_wb32(pb, codec->extradata_size);
274 avio_write(pb, codec->extradata, codec->extradata_size);
276 write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
278 switch(codec->codec_type) {
279 case AVMEDIA_TYPE_VIDEO:
280 if (st->recommended_encoder_configuration) {
281 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
282 st->recommended_encoder_configuration);
283 if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'),
284 st->recommended_encoder_configuration)) < 0)
286 } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 ||
287 (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0)
290 case AVMEDIA_TYPE_AUDIO:
291 if (st->recommended_encoder_configuration) {
292 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
293 st->recommended_encoder_configuration);
294 if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'),
295 st->recommended_encoder_configuration)) < 0)
297 } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 ||
298 (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0)
307 avio_wb64(pb, 0); // end of header
309 /* flush until end of block reached */
310 while ((avio_tell(pb) % ffm->packet_size) != 0)
315 /* init packet mux */
316 ffm->packet_ptr = ffm->packet;
317 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
318 av_assert0(ffm->packet_end >= ffm->packet);
319 ffm->frame_offset = 0;
321 ffm->first_packet = 1;
326 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
328 FFMContext *ffm = s->priv_data;
330 uint8_t header[FRAME_HEADER_SIZE+4];
331 int header_size = FRAME_HEADER_SIZE;
333 dts = ffm->start_time + pkt->dts;
334 /* packet size & key_frame */
335 header[0] = pkt->stream_index;
337 if (pkt->flags & AV_PKT_FLAG_KEY)
338 header[1] |= FLAG_KEY_FRAME;
339 AV_WB24(header+2, pkt->size);
340 AV_WB24(header+5, pkt->duration);
341 AV_WB64(header+8, ffm->start_time + pkt->pts);
342 if (pkt->pts != pkt->dts) {
343 header[1] |= FLAG_DTS;
344 AV_WB32(header+16, pkt->pts - pkt->dts);
347 ffm_write_data(s, header, header_size, dts, 1);
348 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
353 static int ffm_write_trailer(AVFormatContext *s)
355 FFMContext *ffm = s->priv_data;
358 if (ffm->packet_ptr > ffm->packet)
364 AVOutputFormat ff_ffm_muxer = {
366 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
368 .priv_data_size = sizeof(FFMContext),
369 .audio_codec = AV_CODEC_ID_MP2,
370 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
371 .write_header = ffm_write_header,
372 .write_packet = ffm_write_packet,
373 .write_trailer = ffm_write_trailer,
374 .flags = AVFMT_TS_NEGATIVE,