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
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "libavutil/avassert.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 assert(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 int ffm_write_header(AVFormatContext *s)
89 FFMContext *ffm = s->priv_data;
91 AVIOContext *pb = s->pb;
92 AVCodecContext *codec;
95 ffm->packet_size = FFM_PACKET_SIZE;
98 avio_wl32(pb, MKTAG('F', 'F', 'M', '1'));
99 avio_wb32(pb, ffm->packet_size);
100 avio_wb64(pb, 0); /* current write position */
102 avio_wb32(pb, s->nb_streams);
104 for(i=0;i<s->nb_streams;i++) {
106 bit_rate += st->codec->bit_rate;
108 avio_wb32(pb, bit_rate);
110 /* list of streams */
111 for(i=0;i<s->nb_streams;i++) {
113 avpriv_set_pts_info(st, 64, 1, 1000000);
117 avio_wb32(pb, codec->codec_id);
118 avio_w8(pb, codec->codec_type);
119 avio_wb32(pb, codec->bit_rate);
120 avio_wb32(pb, codec->flags);
121 avio_wb32(pb, codec->flags2);
122 avio_wb32(pb, codec->debug);
124 switch(codec->codec_type) {
125 case AVMEDIA_TYPE_VIDEO:
126 avio_wb32(pb, codec->time_base.num);
127 avio_wb32(pb, codec->time_base.den);
128 avio_wb16(pb, codec->width);
129 avio_wb16(pb, codec->height);
130 avio_wb16(pb, codec->gop_size);
131 avio_wb32(pb, codec->pix_fmt);
132 avio_w8(pb, codec->qmin);
133 avio_w8(pb, codec->qmax);
134 avio_w8(pb, codec->max_qdiff);
135 avio_wb16(pb, (int) (codec->qcompress * 10000.0));
136 avio_wb16(pb, (int) (codec->qblur * 10000.0));
137 avio_wb32(pb, codec->bit_rate_tolerance);
138 avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp");
139 avio_wb32(pb, codec->rc_max_rate);
140 avio_wb32(pb, codec->rc_min_rate);
141 avio_wb32(pb, codec->rc_buffer_size);
142 avio_wb64(pb, av_double2int(codec->i_quant_factor));
143 avio_wb64(pb, av_double2int(codec->b_quant_factor));
144 avio_wb64(pb, av_double2int(codec->i_quant_offset));
145 avio_wb64(pb, av_double2int(codec->b_quant_offset));
146 avio_wb32(pb, codec->dct_algo);
147 avio_wb32(pb, codec->strict_std_compliance);
148 avio_wb32(pb, codec->max_b_frames);
149 avio_wb32(pb, codec->mpeg_quant);
150 avio_wb32(pb, codec->intra_dc_precision);
151 avio_wb32(pb, codec->me_method);
152 avio_wb32(pb, codec->mb_decision);
153 avio_wb32(pb, codec->nsse_weight);
154 avio_wb32(pb, codec->frame_skip_cmp);
155 avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity));
156 avio_wb32(pb, codec->codec_tag);
157 avio_w8(pb, codec->thread_count);
158 avio_wb32(pb, codec->coder_type);
159 avio_wb32(pb, codec->me_cmp);
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_double2int(codec->qcompress));
166 avio_wb64(pb, av_double2int(codec->qblur));
167 avio_wb32(pb, codec->max_qdiff);
168 avio_wb32(pb, codec->refs);
170 case AVMEDIA_TYPE_AUDIO:
171 avio_wb32(pb, codec->sample_rate);
172 avio_wl16(pb, codec->channels);
173 avio_wl16(pb, codec->frame_size);
174 avio_wl16(pb, codec->sample_fmt);
179 if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) {
180 avio_wb32(pb, codec->extradata_size);
181 avio_write(pb, codec->extradata, codec->extradata_size);
185 /* flush until end of block reached */
186 while ((avio_tell(pb) % ffm->packet_size) != 0)
191 /* init packet mux */
192 ffm->packet_ptr = ffm->packet;
193 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
194 av_assert0(ffm->packet_end >= ffm->packet);
195 ffm->frame_offset = 0;
197 ffm->first_packet = 1;
202 static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
205 uint8_t header[FRAME_HEADER_SIZE+4];
206 int header_size = FRAME_HEADER_SIZE;
209 /* packet size & key_frame */
210 header[0] = pkt->stream_index;
212 if (pkt->flags & AV_PKT_FLAG_KEY)
213 header[1] |= FLAG_KEY_FRAME;
214 AV_WB24(header+2, pkt->size);
215 AV_WB24(header+5, pkt->duration);
216 AV_WB64(header+8, pkt->pts);
217 if (pkt->pts != pkt->dts) {
218 header[1] |= FLAG_DTS;
219 AV_WB32(header+16, pkt->pts - pkt->dts);
222 ffm_write_data(s, header, header_size, dts, 1);
223 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
228 static int ffm_write_trailer(AVFormatContext *s)
230 AVIOContext *pb = s->pb;
231 FFMContext *ffm = s->priv_data;
234 if (ffm->packet_ptr > ffm->packet)
242 AVOutputFormat ff_ffm_muxer = {
244 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
246 .priv_data_size = sizeof(FFMContext),
247 .audio_codec = AV_CODEC_ID_MP2,
248 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
249 .write_header = ffm_write_header,
250 .write_packet = ffm_write_packet,
251 .write_trailer = ffm_write_trailer,