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"
28 #include "avio_internal.h"
32 static void flush_packet(AVFormatContext *s)
34 FFMContext *ffm = s->priv_data;
36 AVIOContext *pb = s->pb;
38 fill_size = ffm->packet_end - ffm->packet_ptr;
39 memset(ffm->packet_ptr, 0, fill_size);
41 av_assert1(avio_tell(pb) % ffm->packet_size == 0);
44 avio_wb16(pb, PACKET_ID);
45 avio_wb16(pb, fill_size);
46 avio_wb64(pb, ffm->dts);
47 h = ffm->frame_offset;
48 if (ffm->first_packet)
51 avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
54 /* prepare next packet */
55 ffm->frame_offset = 0; /* no key frame */
56 ffm->packet_ptr = ffm->packet;
57 ffm->first_packet = 0;
60 /* 'first' is true if first data of a frame */
61 static void ffm_write_data(AVFormatContext *s,
62 const uint8_t *buf, int size,
63 int64_t dts, int header)
65 FFMContext *ffm = s->priv_data;
68 if (header && ffm->frame_offset == 0) {
69 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
73 /* write as many packets as needed */
75 len = ffm->packet_end - ffm->packet_ptr;
78 memcpy(ffm->packet_ptr, buf, len);
80 ffm->packet_ptr += len;
83 if (ffm->packet_ptr >= ffm->packet_end)
88 static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
91 int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
93 avio_wb32(pb, dyn_size);
94 avio_write(pb, dyn_buf, dyn_size);
98 static int ffm_write_header_codec_private_ctx(AVFormatContext *s, AVCodecContext *ctx, int type)
100 AVIOContext *pb = s->pb;
104 const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
107 av_log(s, AV_LOG_WARNING, "Stream codec is not found. Codec private options are not stored.\n");
110 if (ctx->priv_data && enc->priv_class && enc->priv_data_size) {
111 if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type,
112 AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0)
114 if (buf && strlen(buf)) {
115 if (avio_open_dyn_buf(&tmp) < 0) {
117 return AVERROR(ENOMEM);
119 avio_put_str(tmp, buf);
120 write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
127 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 ffio_free_dyn_buf(&tmp);
163 #undef OPT_FLAGS_EXACT
167 static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag,
168 const char *configuration)
171 const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
173 AVDictionaryEntry *t = NULL;
174 AVDictionary *all = NULL, *comm = NULL, *prv = NULL;
177 if (!enc || !enc->priv_class || !enc->priv_data_size) {
178 /* codec is not known/has no private options, so save everything as common options */
179 if (avio_open_dyn_buf(&tmp) < 0)
180 return AVERROR(ENOMEM);
181 avio_put_str(tmp, configuration);
182 write_header_chunk(pb, tmp, tag);
186 if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0)
189 while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) {
190 if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
191 if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0)
193 } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0)
198 if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 ||
199 (ret = avio_open_dyn_buf(&tmp)) < 0)
201 avio_put_str(tmp, buf);
203 write_header_chunk(pb, tmp, tag);
206 if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 ||
207 (ret = avio_open_dyn_buf(&tmp)) < 0)
209 avio_put_str(tmp, buf);
210 write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
221 static int ffm_write_header(AVFormatContext *s)
223 FFMContext *ffm = s->priv_data;
224 AVDictionaryEntry *t;
226 AVIOContext *pb = s->pb;
227 AVCodecContext *codec;
228 int bit_rate, i, ret;
230 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
231 ret = av_parse_time(&ffm->start_time, t->value, 0);
236 ffm->packet_size = FFM_PACKET_SIZE;
239 avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
240 avio_wb32(pb, ffm->packet_size);
241 avio_wb64(pb, 0); /* current write position */
243 if(avio_open_dyn_buf(&pb) < 0)
244 return AVERROR(ENOMEM);
246 avio_wb32(pb, s->nb_streams);
248 for(i=0;i<s->nb_streams;i++) {
250 bit_rate += st->codec->bit_rate;
252 avio_wb32(pb, bit_rate);
254 write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
256 /* list of streams */
257 for(i=0;i<s->nb_streams;i++) {
259 avpriv_set_pts_info(st, 64, 1, 1000000);
260 if(avio_open_dyn_buf(&pb) < 0)
261 return AVERROR(ENOMEM);
265 avio_wb32(pb, codec->codec_id);
266 avio_w8(pb, codec->codec_type);
267 avio_wb32(pb, codec->bit_rate);
268 avio_wb32(pb, codec->flags);
269 avio_wb32(pb, codec->flags2);
270 avio_wb32(pb, codec->debug);
271 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
272 avio_wb32(pb, codec->extradata_size);
273 avio_write(pb, codec->extradata, codec->extradata_size);
275 write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
277 switch(codec->codec_type) {
278 case AVMEDIA_TYPE_VIDEO:
279 if (st->recommended_encoder_configuration) {
280 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
281 st->recommended_encoder_configuration);
282 if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'),
283 st->recommended_encoder_configuration)) < 0)
285 } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 ||
286 (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0)
289 case AVMEDIA_TYPE_AUDIO:
290 if (st->recommended_encoder_configuration) {
291 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
292 st->recommended_encoder_configuration);
293 if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'),
294 st->recommended_encoder_configuration)) < 0)
296 } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 ||
297 (ret = ffm_write_header_codec_private_ctx(s, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0)
306 avio_wb64(pb, 0); // end of header
308 /* flush until end of block reached */
309 while ((avio_tell(pb) % ffm->packet_size) != 0)
314 /* init packet mux */
315 ffm->packet_ptr = ffm->packet;
316 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
317 av_assert0(ffm->packet_end >= ffm->packet);
318 ffm->frame_offset = 0;
320 ffm->first_packet = 1;
325 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
327 FFMContext *ffm = s->priv_data;
329 uint8_t header[FRAME_HEADER_SIZE+4];
330 int header_size = FRAME_HEADER_SIZE;
332 dts = ffm->start_time + pkt->dts;
333 /* packet size & key_frame */
334 header[0] = pkt->stream_index;
336 if (pkt->flags & AV_PKT_FLAG_KEY)
337 header[1] |= FLAG_KEY_FRAME;
338 AV_WB24(header+2, pkt->size);
339 AV_WB24(header+5, pkt->duration);
340 AV_WB64(header+8, ffm->start_time + pkt->pts);
341 if (pkt->pts != pkt->dts) {
342 header[1] |= FLAG_DTS;
343 AV_WB32(header+16, pkt->pts - pkt->dts);
346 ffm_write_data(s, header, header_size, dts, 1);
347 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
352 static int ffm_write_trailer(AVFormatContext *s)
354 FFMContext *ffm = s->priv_data;
357 if (ffm->packet_ptr > ffm->packet)
363 AVOutputFormat ff_ffm_muxer = {
365 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
367 .priv_data_size = sizeof(FFMContext),
368 .audio_codec = AV_CODEC_ID_MP2,
369 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
370 .write_header = ffm_write_header,
371 .write_packet = ffm_write_packet,
372 .write_trailer = ffm_write_trailer,
373 .flags = AVFMT_TS_NEGATIVE,