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(AVIOContext *pb, AVCodecContext *ctx, int type)
102 const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id);
105 return AVERROR(EINVAL);
106 if (ctx->priv_data && enc->priv_class && enc->priv_data_size) {
107 if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type,
108 AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0)
110 if (buf && strlen(buf)) {
111 if (avio_open_dyn_buf(&tmp) < 0) {
113 return AVERROR(ENOMEM);
115 avio_put_str(tmp, buf);
116 write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
123 static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type)
128 int ret, need_coma = 0;
130 #define SKIP_DEFAULTS AV_OPT_SERIALIZE_SKIP_DEFAULTS
131 #define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT
132 #define ENC AV_OPT_FLAG_ENCODING_PARAM
134 if (avio_open_dyn_buf(&tmp) < 0)
135 return AVERROR(ENOMEM);
136 if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0)
138 if (buf && strlen(buf)) {
139 avio_write(tmp, buf, strlen(buf));
143 if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0)
145 if (buf && strlen(buf)) {
148 avio_write(tmp, buf, strlen(buf));
152 write_header_chunk(pb, tmp, tag);
156 avio_close_dyn_buf(tmp, &p);
161 #undef OPT_FLAGS_EXACT
165 static int ffm_write_header(AVFormatContext *s)
167 FFMContext *ffm = s->priv_data;
168 AVDictionaryEntry *t;
170 AVIOContext *pb = s->pb;
171 AVCodecContext *codec;
172 int bit_rate, i, ret;
174 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
175 ret = av_parse_time(&ffm->start_time, t->value, 0);
180 ffm->packet_size = FFM_PACKET_SIZE;
183 avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
184 avio_wb32(pb, ffm->packet_size);
185 avio_wb64(pb, 0); /* current write position */
187 if(avio_open_dyn_buf(&pb) < 0)
188 return AVERROR(ENOMEM);
190 avio_wb32(pb, s->nb_streams);
192 for(i=0;i<s->nb_streams;i++) {
194 bit_rate += st->codec->bit_rate;
196 avio_wb32(pb, bit_rate);
198 write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
200 /* list of streams */
201 for(i=0;i<s->nb_streams;i++) {
203 avpriv_set_pts_info(st, 64, 1, 1000000);
204 if(avio_open_dyn_buf(&pb) < 0)
205 return AVERROR(ENOMEM);
209 avio_wb32(pb, codec->codec_id);
210 avio_w8(pb, codec->codec_type);
211 avio_wb32(pb, codec->bit_rate);
212 avio_wb32(pb, codec->flags);
213 avio_wb32(pb, codec->flags2);
214 avio_wb32(pb, codec->debug);
215 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
216 avio_wb32(pb, codec->extradata_size);
217 avio_write(pb, codec->extradata, codec->extradata_size);
219 write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
221 switch(codec->codec_type) {
222 case AVMEDIA_TYPE_VIDEO:
223 if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 ||
224 (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0)
227 case AVMEDIA_TYPE_AUDIO:
228 if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 ||
229 (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0)
238 avio_wb64(pb, 0); // end of header
240 /* flush until end of block reached */
241 while ((avio_tell(pb) % ffm->packet_size) != 0)
246 /* init packet mux */
247 ffm->packet_ptr = ffm->packet;
248 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
249 av_assert0(ffm->packet_end >= ffm->packet);
250 ffm->frame_offset = 0;
252 ffm->first_packet = 1;
257 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
259 FFMContext *ffm = s->priv_data;
261 uint8_t header[FRAME_HEADER_SIZE+4];
262 int header_size = FRAME_HEADER_SIZE;
264 dts = ffm->start_time + pkt->dts;
265 /* packet size & key_frame */
266 header[0] = pkt->stream_index;
268 if (pkt->flags & AV_PKT_FLAG_KEY)
269 header[1] |= FLAG_KEY_FRAME;
270 AV_WB24(header+2, pkt->size);
271 AV_WB24(header+5, pkt->duration);
272 AV_WB64(header+8, ffm->start_time + pkt->pts);
273 if (pkt->pts != pkt->dts) {
274 header[1] |= FLAG_DTS;
275 AV_WB32(header+16, pkt->pts - pkt->dts);
278 ffm_write_data(s, header, header_size, dts, 1);
279 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
284 static int ffm_write_trailer(AVFormatContext *s)
286 FFMContext *ffm = s->priv_data;
289 if (ffm->packet_ptr > ffm->packet)
295 AVOutputFormat ff_ffm_muxer = {
297 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
299 .priv_data_size = sizeof(FFMContext),
300 .audio_codec = AV_CODEC_ID_MP2,
301 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
302 .write_header = ffm_write_header,
303 .write_packet = ffm_write_packet,
304 .write_trailer = ffm_write_trailer,
305 .flags = AVFMT_TS_NEGATIVE,