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"
30 static void flush_packet(AVFormatContext *s)
32 FFMContext *ffm = s->priv_data;
34 AVIOContext *pb = s->pb;
36 fill_size = ffm->packet_end - ffm->packet_ptr;
37 memset(ffm->packet_ptr, 0, fill_size);
39 av_assert1(avio_tell(pb) % ffm->packet_size == 0);
42 avio_wb16(pb, PACKET_ID);
43 avio_wb16(pb, fill_size);
44 avio_wb64(pb, ffm->dts);
45 h = ffm->frame_offset;
46 if (ffm->first_packet)
49 avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
52 /* prepare next packet */
53 ffm->frame_offset = 0; /* no key frame */
54 ffm->packet_ptr = ffm->packet;
55 ffm->first_packet = 0;
58 /* 'first' is true if first data of a frame */
59 static void ffm_write_data(AVFormatContext *s,
60 const uint8_t *buf, int size,
61 int64_t dts, int header)
63 FFMContext *ffm = s->priv_data;
66 if (header && ffm->frame_offset == 0) {
67 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
71 /* write as many packets as needed */
73 len = ffm->packet_end - ffm->packet_ptr;
76 memcpy(ffm->packet_ptr, buf, len);
78 ffm->packet_ptr += len;
81 if (ffm->packet_ptr >= ffm->packet_end)
86 static int ffm_write_header(AVFormatContext *s)
88 FFMContext *ffm = s->priv_data;
91 AVIOContext *pb = s->pb;
92 AVCodecContext *codec;
95 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) {
96 int ret = av_parse_time(&ffm->start_time, t->value, 0);
101 ffm->packet_size = FFM_PACKET_SIZE;
104 avio_wl32(pb, MKTAG('F', 'F', 'M', '1'));
105 avio_wb32(pb, ffm->packet_size);
106 avio_wb64(pb, 0); /* current write position */
108 avio_wb32(pb, s->nb_streams);
110 for(i=0;i<s->nb_streams;i++) {
112 bit_rate += st->codec->bit_rate;
114 avio_wb32(pb, bit_rate);
116 /* list of streams */
117 for(i=0;i<s->nb_streams;i++) {
119 avpriv_set_pts_info(st, 64, 1, 1000000);
123 avio_wb32(pb, codec->codec_id);
124 avio_w8(pb, codec->codec_type);
125 avio_wb32(pb, codec->bit_rate);
126 avio_wb32(pb, codec->flags);
127 avio_wb32(pb, codec->flags2);
128 avio_wb32(pb, codec->debug);
130 switch(codec->codec_type) {
131 case AVMEDIA_TYPE_VIDEO:
132 avio_wb32(pb, codec->time_base.num);
133 avio_wb32(pb, codec->time_base.den);
134 avio_wb16(pb, codec->width);
135 avio_wb16(pb, codec->height);
136 avio_wb16(pb, codec->gop_size);
137 avio_wb32(pb, codec->pix_fmt);
138 avio_w8(pb, codec->qmin);
139 avio_w8(pb, codec->qmax);
140 avio_w8(pb, codec->max_qdiff);
141 avio_wb16(pb, (int) (codec->qcompress * 10000.0));
142 avio_wb16(pb, (int) (codec->qblur * 10000.0));
143 avio_wb32(pb, codec->bit_rate_tolerance);
144 avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
145 avio_wb32(pb, codec->rc_max_rate);
146 avio_wb32(pb, codec->rc_min_rate);
147 avio_wb32(pb, codec->rc_buffer_size);
148 avio_wb64(pb, av_double2int(codec->i_quant_factor));
149 avio_wb64(pb, av_double2int(codec->b_quant_factor));
150 avio_wb64(pb, av_double2int(codec->i_quant_offset));
151 avio_wb64(pb, av_double2int(codec->b_quant_offset));
152 avio_wb32(pb, codec->dct_algo);
153 avio_wb32(pb, codec->strict_std_compliance);
154 avio_wb32(pb, codec->max_b_frames);
155 avio_wb32(pb, codec->mpeg_quant);
156 avio_wb32(pb, codec->intra_dc_precision);
157 avio_wb32(pb, codec->me_method);
158 avio_wb32(pb, codec->mb_decision);
159 avio_wb32(pb, codec->nsse_weight);
160 avio_wb32(pb, codec->frame_skip_cmp);
161 avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity));
162 avio_wb32(pb, codec->codec_tag);
163 avio_w8(pb, codec->thread_count);
164 avio_wb32(pb, codec->coder_type);
165 avio_wb32(pb, codec->me_cmp);
166 avio_wb32(pb, codec->me_subpel_quality);
167 avio_wb32(pb, codec->me_range);
168 avio_wb32(pb, codec->keyint_min);
169 avio_wb32(pb, codec->scenechange_threshold);
170 avio_wb32(pb, codec->b_frame_strategy);
171 avio_wb64(pb, av_double2int(codec->qcompress));
172 avio_wb64(pb, av_double2int(codec->qblur));
173 avio_wb32(pb, codec->max_qdiff);
174 avio_wb32(pb, codec->refs);
176 case AVMEDIA_TYPE_AUDIO:
177 avio_wb32(pb, codec->sample_rate);
178 avio_wl16(pb, codec->channels);
179 avio_wl16(pb, codec->frame_size);
184 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
185 avio_wb32(pb, codec->extradata_size);
186 avio_write(pb, codec->extradata, codec->extradata_size);
190 /* flush until end of block reached */
191 while ((avio_tell(pb) % ffm->packet_size) != 0)
196 /* init packet mux */
197 ffm->packet_ptr = ffm->packet;
198 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
199 av_assert0(ffm->packet_end >= ffm->packet);
200 ffm->frame_offset = 0;
202 ffm->first_packet = 1;
207 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
209 FFMContext *ffm = s->priv_data;
211 uint8_t header[FRAME_HEADER_SIZE+4];
212 int header_size = FRAME_HEADER_SIZE;
214 dts = ffm->start_time + pkt->dts;
215 /* packet size & key_frame */
216 header[0] = pkt->stream_index;
218 if (pkt->flags & AV_PKT_FLAG_KEY)
219 header[1] |= FLAG_KEY_FRAME;
220 AV_WB24(header+2, pkt->size);
221 AV_WB24(header+5, pkt->duration);
222 AV_WB64(header+8, ffm->start_time + pkt->pts);
223 if (pkt->pts != pkt->dts) {
224 header[1] |= FLAG_DTS;
225 AV_WB32(header+16, pkt->pts - pkt->dts);
228 ffm_write_data(s, header, header_size, dts, 1);
229 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
234 static int ffm_write_trailer(AVFormatContext *s)
236 FFMContext *ffm = s->priv_data;
239 if (ffm->packet_ptr > ffm->packet)
245 AVOutputFormat ff_ffm_muxer = {
247 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
249 .priv_data_size = sizeof(FFMContext),
250 .audio_codec = AV_CODEC_ID_MP2,
251 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
252 .write_header = ffm_write_header,
253 .write_packet = ffm_write_packet,
254 .write_trailer = ffm_write_trailer,