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path: root/libavformat/ffmenc.c (plain)
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1/*
2 * FFM (ffserver live feed) muxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
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"
27#include "avformat.h"
28#include "avio_internal.h"
29#include "internal.h"
30#include "ffm.h"
31
32static void flush_packet(AVFormatContext *s)
33{
34 FFMContext *ffm = s->priv_data;
35 int fill_size, h;
36 AVIOContext *pb = s->pb;
37
38 fill_size = ffm->packet_end - ffm->packet_ptr;
39 memset(ffm->packet_ptr, 0, fill_size);
40
41 av_assert1(avio_tell(pb) % ffm->packet_size == 0);
42
43 /* put header */
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)
49 h |= 0x8000;
50 avio_wb16(pb, h);
51 avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet);
52 avio_flush(pb);
53
54 /* prepare next packet */
55 ffm->frame_offset = 0; /* no key frame */
56 ffm->packet_ptr = ffm->packet;
57 ffm->first_packet = 0;
58}
59
60/* 'first' is true if first data of a frame */
61static void ffm_write_data(AVFormatContext *s,
62 const uint8_t *buf, int size,
63 int64_t dts, int header)
64{
65 FFMContext *ffm = s->priv_data;
66 int len;
67
68 if (header && ffm->frame_offset == 0) {
69 ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE;
70 ffm->dts = dts;
71 }
72
73 /* write as many packets as needed */
74 while (size > 0) {
75 len = ffm->packet_end - ffm->packet_ptr;
76 if (len > size)
77 len = size;
78 memcpy(ffm->packet_ptr, buf, len);
79
80 ffm->packet_ptr += len;
81 buf += len;
82 size -= len;
83 if (ffm->packet_ptr >= ffm->packet_end)
84 flush_packet(s);
85 }
86}
87
88static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id)
89{
90 uint8_t *dyn_buf;
91 int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf);
92 avio_wb32(pb, id);
93 avio_wb32(pb, dyn_size);
94 avio_write(pb, dyn_buf, dyn_size);
95 av_free(dyn_buf);
96}
97
98static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecParameters *ctxpar, unsigned tag, int type)
99{
100 AVIOContext *tmp;
101 char *buf = NULL;
102 int ret, need_coma = 0;
103 AVCodecContext *ctx = NULL;
104
105#define SKIP_DEFAULTS AV_OPT_SERIALIZE_SKIP_DEFAULTS
106#define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT
107#define ENC AV_OPT_FLAG_ENCODING_PARAM
108
109 if (avio_open_dyn_buf(&tmp) < 0)
110 return AVERROR(ENOMEM);
111
112 // AVCodecParameters does not suport AVOptions, we thus must copy it over to a context that does
113 // otherwise it could be used directly and this would be much simpler
114 ctx = avcodec_alloc_context3(NULL);
115 if (!ctx) {
116 ret = AVERROR(ENOMEM);
117 goto fail;
118 }
119 avcodec_parameters_to_context(ctx, ctxpar);
120
121 if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0)
122 goto fail;
123 if (buf && strlen(buf)) {
124 avio_write(tmp, buf, strlen(buf));
125 av_freep(&buf);
126 need_coma = 1;
127 }
128 if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0)
129 goto fail;
130 if (buf && strlen(buf)) {
131 if (need_coma)
132 avio_w8(tmp, ',');
133 avio_write(tmp, buf, strlen(buf));
134 }
135 av_freep(&buf);
136 avio_w8(tmp, 0);
137 write_header_chunk(pb, tmp, tag);
138 avcodec_free_context(&ctx);
139 return 0;
140 fail:
141 av_free(buf);
142 ffio_free_dyn_buf(&tmp);
143 avcodec_free_context(&ctx);
144 return ret;
145
146#undef SKIP_DEFAULTS
147#undef OPT_FLAGS_EXACT
148#undef ENC
149}
150
151static int ffm_write_recommended_config(AVIOContext *pb, AVCodecParameters *codecpar, unsigned tag,
152 const char *configuration)
153{
154 int ret;
155 const AVCodec *enc = avcodec_find_encoder(codecpar->codec_id);
156 AVIOContext *tmp;
157 AVDictionaryEntry *t = NULL;
158 AVDictionary *all = NULL, *comm = NULL, *prv = NULL;
159 char *buf = NULL;
160
161 if (!enc || !enc->priv_class || !enc->priv_data_size) {
162 /* codec is not known/has no private options, so save everything as common options */
163 if (avio_open_dyn_buf(&tmp) < 0)
164 return AVERROR(ENOMEM);
165 avio_put_str(tmp, configuration);
166 write_header_chunk(pb, tmp, tag);
167 return 0;
168 }
169
170 if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0)
171 return ret;
172
173 while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) {
174 if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) {
175 if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0)
176 goto fail;
177 } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0)
178 goto fail;
179 }
180
181 if (comm) {
182 if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 ||
183 (ret = avio_open_dyn_buf(&tmp)) < 0)
184 goto fail;
185 avio_put_str(tmp, buf);
186 av_freep(&buf);
187 write_header_chunk(pb, tmp, tag);
188 }
189 if (prv) {
190 if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 ||
191 (ret = avio_open_dyn_buf(&tmp)) < 0)
192 goto fail;
193 avio_put_str(tmp, buf);
194 write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V'));
195 }
196
197 fail:
198 av_free(buf);
199 av_dict_free(&all);
200 av_dict_free(&comm);
201 av_dict_free(&prv);
202 return ret;
203}
204
205static int ffm_write_header(AVFormatContext *s)
206{
207 FFMContext *ffm = s->priv_data;
208 AVStream *st;
209 AVIOContext *pb = s->pb;
210 AVCodecParameters *codecpar;
211 int bit_rate, i, ret;
212
213 if ((ret = ff_parse_creation_time_metadata(s, &ffm->start_time, 0)) < 0)
214 return ret;
215
216 ffm->packet_size = FFM_PACKET_SIZE;
217
218 /* header */
219 avio_wl32(pb, MKTAG('F', 'F', 'M', '2'));
220 avio_wb32(pb, ffm->packet_size);
221 avio_wb64(pb, 0); /* current write position */
222
223 if(avio_open_dyn_buf(&pb) < 0)
224 return AVERROR(ENOMEM);
225
226 avio_wb32(pb, s->nb_streams);
227 bit_rate = 0;
228 for(i=0;i<s->nb_streams;i++) {
229 st = s->streams[i];
230 bit_rate += st->codecpar->bit_rate;
231 }
232 avio_wb32(pb, bit_rate);
233
234 write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N'));
235
236 /* list of streams */
237 for(i=0;i<s->nb_streams;i++) {
238 int flags = 0;
239 st = s->streams[i];
240 avpriv_set_pts_info(st, 64, 1, 1000000);
241 if(avio_open_dyn_buf(&pb) < 0)
242 return AVERROR(ENOMEM);
243
244 codecpar = st->codecpar;
245 /* generic info */
246 avio_wb32(pb, codecpar->codec_id);
247 avio_w8(pb, codecpar->codec_type);
248 avio_wb32(pb, codecpar->bit_rate);
249 if (codecpar->extradata_size)
250 flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
251
252 // If the user is not providing us with a configuration we have to fill it in as we cannot access the encoder
253 if (!st->recommended_encoder_configuration) {
254 if (s->flags & AVFMT_FLAG_BITEXACT)
255 flags |= AV_CODEC_FLAG_BITEXACT;
256 }
257
258 avio_wb32(pb, flags);
259 avio_wb32(pb, 0); // flags2
260 avio_wb32(pb, 0); // debug
261 if (codecpar->extradata_size) {
262 avio_wb32(pb, codecpar->extradata_size);
263 avio_write(pb, codecpar->extradata, codecpar->extradata_size);
264 }
265 write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M'));
266 /* specific info */
267 switch(codecpar->codec_type) {
268 case AVMEDIA_TYPE_VIDEO:
269 if (st->recommended_encoder_configuration) {
270 av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n",
271 st->recommended_encoder_configuration);
272 if ((ret = ffm_write_recommended_config(s->pb, codecpar, MKBETAG('S', '2', 'V', 'I'),
273 st->recommended_encoder_configuration)) < 0)
274 return ret;
275 } else if ((ret = ffm_write_header_codec_ctx(s->pb, codecpar, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0)
276 return ret;
277 break;
278 case AVMEDIA_TYPE_AUDIO:
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, codecpar, MKBETAG('S', '2', 'A', 'U'),
283 st->recommended_encoder_configuration)) < 0)
284 return ret;
285 } else if ((ret = ffm_write_header_codec_ctx(s->pb, codecpar, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0)
286 return ret;
287 break;
288 default:
289 return -1;
290 }
291 }
292 pb = s->pb;
293
294 avio_wb64(pb, 0); // end of header
295
296 /* flush until end of block reached */
297 while ((avio_tell(pb) % ffm->packet_size) != 0)
298 avio_w8(pb, 0);
299
300 avio_flush(pb);
301
302 /* init packet mux */
303 ffm->packet_ptr = ffm->packet;
304 ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE;
305 av_assert0(ffm->packet_end >= ffm->packet);
306 ffm->frame_offset = 0;
307 ffm->dts = 0;
308 ffm->first_packet = 1;
309
310 return 0;
311}
312
313static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt)
314{
315 FFMContext *ffm = s->priv_data;
316 int64_t dts;
317 uint8_t header[FRAME_HEADER_SIZE+4];
318 int header_size = FRAME_HEADER_SIZE;
319
320 dts = ffm->start_time + pkt->dts;
321 /* packet size & key_frame */
322 header[0] = pkt->stream_index;
323 header[1] = 0;
324 if (pkt->flags & AV_PKT_FLAG_KEY)
325 header[1] |= FLAG_KEY_FRAME;
326 AV_WB24(header+2, pkt->size);
327 AV_WB24(header+5, pkt->duration);
328 AV_WB64(header+8, ffm->start_time + pkt->pts);
329 if (pkt->pts != pkt->dts) {
330 header[1] |= FLAG_DTS;
331 AV_WB32(header+16, pkt->pts - pkt->dts);
332 header_size += 4;
333 }
334 ffm_write_data(s, header, header_size, dts, 1);
335 ffm_write_data(s, pkt->data, pkt->size, dts, 0);
336
337 return 0;
338}
339
340static int ffm_write_trailer(AVFormatContext *s)
341{
342 FFMContext *ffm = s->priv_data;
343
344 /* flush packets */
345 if (ffm->packet_ptr > ffm->packet)
346 flush_packet(s);
347
348 return 0;
349}
350
351AVOutputFormat ff_ffm_muxer = {
352 .name = "ffm",
353 .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"),
354 .extensions = "ffm",
355 .priv_data_size = sizeof(FFMContext),
356 .audio_codec = AV_CODEC_ID_MP2,
357 .video_codec = AV_CODEC_ID_MPEG1VIDEO,
358 .write_header = ffm_write_header,
359 .write_packet = ffm_write_packet,
360 .write_trailer = ffm_write_trailer,
361 .flags = AVFMT_TS_NEGATIVE,
362};
363
generated by cgit at 2024-05-17 16:00:06 (GMT)