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_readwrite.h"
27 static void flush_packet(AVFormatContext *s)
29 FFMContext *ffm = s->priv_data;
31 AVIOContext *pb = s->pb;
33 fill_size = ffm->packet_end - ffm->packet_ptr;
34 memset(ffm->packet_ptr, 0, fill_size);
36 if (avio_tell(pb) % ffm->packet_size)
40 avio_wb16(pb, PACKET_ID);
41 avio_wb16(pb, fill_size);
42 avio_wb64(pb, ffm->dts);
43 h = ffm->frame_offset;
44 if (ffm->first_packet)
47 avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
50 /* prepare next packet */
51 ffm->frame_offset = 0; /* no key frame */
52 ffm->packet_ptr = ffm->packet;
53 ffm->first_packet = 0;
56 /* 'first' is true if first data of a frame */
57 static void ffm_write_data(AVFormatContext *s,
58 const uint8_t *buf, int size,
59 int64_t dts, int header)
61 FFMContext *ffm = s->priv_data;
64 if (header && ffm->frame_offset == 0) {
65 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
69 /* write as many packets as needed */
71 len = ffm->packet_end - ffm->packet_ptr;
74 memcpy(ffm->packet_ptr, buf, len);
76 ffm->packet_ptr += len;
79 if (ffm->packet_ptr >= ffm->packet_end)
84 static int ffm_write_header(AVFormatContext *s)
86 FFMContext *ffm = s->priv_data;
88 AVIOContext *pb = s->pb;
89 AVCodecContext *codec;
92 ffm->packet_size = FFM_PACKET_SIZE;
95 avio_wl32(pb, MKTAG('F', 'F', 'M', '1'));
96 avio_wb32(pb, ffm->packet_size);
97 avio_wb64(pb, 0); /* current write position */
99 avio_wb32(pb, s->nb_streams);
101 for(i=0;i<s->nb_streams;i++) {
103 bit_rate += st->codec->bit_rate;
105 avio_wb32(pb, bit_rate);
107 /* list of streams */
108 for(i=0;i<s->nb_streams;i++) {
110 av_set_pts_info(st, 64, 1, 1000000);
114 avio_wb32(pb, codec->codec_id);
115 avio_w8(pb, codec->codec_type);
116 avio_wb32(pb, codec->bit_rate);
117 avio_wb32(pb, codec->flags);
118 avio_wb32(pb, codec->flags2);
119 avio_wb32(pb, codec->debug);
121 switch(codec->codec_type) {
122 case AVMEDIA_TYPE_VIDEO:
123 avio_wb32(pb, codec->time_base.num);
124 avio_wb32(pb, codec->time_base.den);
125 avio_wb16(pb, codec->width);
126 avio_wb16(pb, codec->height);
127 avio_wb16(pb, codec->gop_size);
128 avio_wb32(pb, codec->pix_fmt);
129 avio_w8(pb, codec->qmin);
130 avio_w8(pb, codec->qmax);
131 avio_w8(pb, codec->max_qdiff);
132 avio_wb16(pb, (int) (codec->qcompress * 10000.0));
133 avio_wb16(pb, (int) (codec->qblur * 10000.0));
134 avio_wb32(pb, codec->bit_rate_tolerance);
135 avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
136 avio_wb32(pb, codec->rc_max_rate);
137 avio_wb32(pb, codec->rc_min_rate);
138 avio_wb32(pb, codec->rc_buffer_size);
139 avio_wb64(pb, av_dbl2int(codec->i_quant_factor));
140 avio_wb64(pb, av_dbl2int(codec->b_quant_factor));
141 avio_wb64(pb, av_dbl2int(codec->i_quant_offset));
142 avio_wb64(pb, av_dbl2int(codec->b_quant_offset));
143 avio_wb32(pb, codec->dct_algo);
144 avio_wb32(pb, codec->strict_std_compliance);
145 avio_wb32(pb, codec->max_b_frames);
146 avio_wb32(pb, codec->luma_elim_threshold);
147 avio_wb32(pb, codec->chroma_elim_threshold);
148 avio_wb32(pb, codec->mpeg_quant);
149 avio_wb32(pb, codec->intra_dc_precision);
150 avio_wb32(pb, codec->me_method);
151 avio_wb32(pb, codec->mb_decision);
152 avio_wb32(pb, codec->nsse_weight);
153 avio_wb32(pb, codec->frame_skip_cmp);
154 avio_wb64(pb, av_dbl2int(codec->rc_buffer_aggressivity));
155 avio_wb32(pb, codec->codec_tag);
156 avio_w8(pb, codec->thread_count);
157 avio_wb32(pb, codec->coder_type);
158 avio_wb32(pb, codec->me_cmp);
159 avio_wb32(pb, codec->partitions);
160 avio_wb32(pb, codec->me_subpel_quality);
161 avio_wb32(pb, codec->me_range);
162 avio_wb32(pb, codec->keyint_min);
163 avio_wb32(pb, codec->scenechange_threshold);
164 avio_wb32(pb, codec->b_frame_strategy);
165 avio_wb64(pb, av_dbl2int(codec->qcompress));
166 avio_wb64(pb, av_dbl2int(codec->qblur));
167 avio_wb32(pb, codec->max_qdiff);
168 avio_wb32(pb, codec->refs);
169 avio_wb32(pb, codec->directpred);
171 case AVMEDIA_TYPE_AUDIO:
172 avio_wb32(pb, codec->sample_rate);
173 avio_wl16(pb, codec->channels);
174 avio_wl16(pb, codec->frame_size);
175 avio_wl16(pb, codec->sample_fmt);
180 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
181 avio_wb32(pb, codec->extradata_size);
182 avio_write(pb, codec->extradata, codec->extradata_size);
186 /* flush until end of block reached */
187 while ((avio_tell(pb) % ffm->packet_size) != 0)
192 /* init packet mux */
193 ffm->packet_ptr = ffm->packet;
194 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
195 assert(ffm->packet_end >= ffm->packet);
196 ffm->frame_offset = 0;
198 ffm->first_packet = 1;
203 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
206 uint8_t header[FRAME_HEADER_SIZE+4];
207 int header_size = FRAME_HEADER_SIZE;
209 dts = s->timestamp + pkt->dts;
210 /* packet size & key_frame */
211 header[0] = pkt->stream_index;
213 if (pkt->flags & AV_PKT_FLAG_KEY)
214 header[1] |= FLAG_KEY_FRAME;
215 AV_WB24(header+2, pkt->size);
216 AV_WB24(header+5, pkt->duration);
217 AV_WB64(header+8, s->timestamp + pkt->pts);
218 if (pkt->pts != pkt->dts) {
219 header[1] |= FLAG_DTS;
220 AV_WB32(header+16, pkt->pts - pkt->dts);
223 ffm_write_data(s, header, header_size, dts, 1);
224 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
229 static int ffm_write_trailer(AVFormatContext *s)
231 AVIOContext *pb = s->pb;
232 FFMContext *ffm = s->priv_data;
235 if (ffm->packet_ptr > ffm->packet)
243 AVOutputFormat ff_ffm_muxer = {
245 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed) format"),
248 .priv_data_size = sizeof(FFMContext),
249 .audio_codec = CODEC_ID_MP2,
250 .video_codec = CODEC_ID_MPEG1VIDEO,
251 .write_header = ffm_write_header,
252 .write_packet = ffm_write_packet,
253 .write_trailer = ffm_write_trailer,