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2ba45a60 DM |
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" | |
f6fa7814 | 26 | #include "libavutil/opt.h" |
2ba45a60 DM |
27 | #include "avformat.h" |
28 | #include "internal.h" | |
29 | #include "ffm.h" | |
30 | ||
31 | static void flush_packet(AVFormatContext *s) | |
32 | { | |
33 | FFMContext *ffm = s->priv_data; | |
34 | int fill_size, h; | |
35 | AVIOContext *pb = s->pb; | |
36 | ||
37 | fill_size = ffm->packet_end - ffm->packet_ptr; | |
38 | memset(ffm->packet_ptr, 0, fill_size); | |
39 | ||
40 | av_assert1(avio_tell(pb) % ffm->packet_size == 0); | |
41 | ||
42 | /* put header */ | |
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) | |
48 | h |= 0x8000; | |
49 | avio_wb16(pb, h); | |
50 | avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet); | |
51 | avio_flush(pb); | |
52 | ||
53 | /* prepare next packet */ | |
54 | ffm->frame_offset = 0; /* no key frame */ | |
55 | ffm->packet_ptr = ffm->packet; | |
56 | ffm->first_packet = 0; | |
57 | } | |
58 | ||
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) | |
63 | { | |
64 | FFMContext *ffm = s->priv_data; | |
65 | int len; | |
66 | ||
67 | if (header && ffm->frame_offset == 0) { | |
68 | ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE; | |
69 | ffm->dts = dts; | |
70 | } | |
71 | ||
72 | /* write as many packets as needed */ | |
73 | while (size > 0) { | |
74 | len = ffm->packet_end - ffm->packet_ptr; | |
75 | if (len > size) | |
76 | len = size; | |
77 | memcpy(ffm->packet_ptr, buf, len); | |
78 | ||
79 | ffm->packet_ptr += len; | |
80 | buf += len; | |
81 | size -= len; | |
82 | if (ffm->packet_ptr >= ffm->packet_end) | |
83 | flush_packet(s); | |
84 | } | |
85 | } | |
86 | ||
87 | static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id) | |
88 | { | |
89 | uint8_t *dyn_buf; | |
90 | int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf); | |
91 | avio_wb32(pb, id); | |
92 | avio_wb32(pb, dyn_size); | |
93 | avio_write(pb, dyn_buf, dyn_size); | |
94 | av_free(dyn_buf); | |
95 | } | |
96 | ||
f6fa7814 DM |
97 | static int ffm_write_header_codec_private_ctx(AVIOContext *pb, AVCodecContext *ctx, int type) |
98 | { | |
99 | AVIOContext *tmp; | |
100 | char *buf = NULL; | |
101 | int ret; | |
102 | const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id); | |
103 | ||
104 | if (!enc) | |
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) | |
109 | return ret; | |
110 | if (buf && strlen(buf)) { | |
111 | if (avio_open_dyn_buf(&tmp) < 0) { | |
112 | av_free(buf); | |
113 | return AVERROR(ENOMEM); | |
114 | } | |
115 | avio_put_str(tmp, buf); | |
116 | write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V')); | |
117 | } | |
118 | av_free(buf); | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type) | |
124 | { | |
125 | AVIOContext *tmp; | |
126 | char *buf = NULL; | |
127 | uint8_t *p = NULL; | |
128 | int ret, need_coma = 0; | |
129 | ||
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 | |
133 | ||
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) | |
137 | goto fail; | |
138 | if (buf && strlen(buf)) { | |
139 | avio_write(tmp, buf, strlen(buf)); | |
140 | av_free(buf); | |
141 | need_coma = 1; | |
142 | } | |
143 | if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0) | |
144 | goto fail; | |
145 | if (buf && strlen(buf)) { | |
146 | if (need_coma) | |
147 | avio_w8(tmp, ','); | |
148 | avio_write(tmp, buf, strlen(buf)); | |
149 | av_free(buf); | |
150 | } | |
151 | avio_w8(tmp, 0); | |
152 | write_header_chunk(pb, tmp, tag); | |
153 | return 0; | |
154 | fail: | |
155 | av_free(buf); | |
156 | avio_close_dyn_buf(tmp, &p); | |
157 | av_free(p); | |
158 | return ret; | |
159 | ||
160 | #undef SKIP_DEFAULTS | |
161 | #undef OPT_FLAGS_EXACT | |
162 | #undef ENC | |
163 | } | |
164 | ||
165 | static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, | |
166 | const char *configuration) | |
167 | { | |
168 | int ret; | |
169 | const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id); | |
170 | AVIOContext *tmp; | |
171 | AVDictionaryEntry *t = NULL; | |
172 | AVDictionary *all = NULL, *comm = NULL, *prv = NULL; | |
173 | char *buf = NULL; | |
174 | ||
175 | if (!enc || !enc->priv_class || !enc->priv_data_size) { | |
176 | /* codec is not known/has no private options, so save everything as common options */ | |
177 | if (avio_open_dyn_buf(&tmp) < 0) | |
178 | return AVERROR(ENOMEM); | |
179 | avio_put_str(tmp, configuration); | |
180 | write_header_chunk(pb, tmp, tag); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0) | |
185 | return ret; | |
186 | ||
187 | while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) { | |
188 | if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) { | |
189 | if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0) | |
190 | goto fail; | |
191 | } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0) | |
192 | goto fail; | |
193 | } | |
194 | ||
195 | if (comm) { | |
196 | if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 || | |
197 | (ret = avio_open_dyn_buf(&tmp)) < 0) | |
198 | goto fail; | |
199 | avio_put_str(tmp, buf); | |
200 | av_freep(&buf); | |
201 | write_header_chunk(pb, tmp, tag); | |
202 | } | |
203 | if (prv) { | |
204 | if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 || | |
205 | (ret = avio_open_dyn_buf(&tmp)) < 0) | |
206 | goto fail; | |
207 | avio_put_str(tmp, buf); | |
208 | write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V')); | |
209 | } | |
210 | ||
211 | fail: | |
212 | av_free(buf); | |
213 | av_dict_free(&all); | |
214 | av_dict_free(&comm); | |
215 | av_dict_free(&prv); | |
216 | return ret; | |
217 | } | |
218 | ||
2ba45a60 DM |
219 | static int ffm_write_header(AVFormatContext *s) |
220 | { | |
221 | FFMContext *ffm = s->priv_data; | |
222 | AVDictionaryEntry *t; | |
223 | AVStream *st; | |
224 | AVIOContext *pb = s->pb; | |
225 | AVCodecContext *codec; | |
f6fa7814 | 226 | int bit_rate, i, ret; |
2ba45a60 DM |
227 | |
228 | if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) { | |
f6fa7814 | 229 | ret = av_parse_time(&ffm->start_time, t->value, 0); |
2ba45a60 DM |
230 | if (ret < 0) |
231 | return ret; | |
232 | } | |
233 | ||
234 | ffm->packet_size = FFM_PACKET_SIZE; | |
235 | ||
236 | /* header */ | |
237 | avio_wl32(pb, MKTAG('F', 'F', 'M', '2')); | |
238 | avio_wb32(pb, ffm->packet_size); | |
239 | avio_wb64(pb, 0); /* current write position */ | |
240 | ||
241 | if(avio_open_dyn_buf(&pb) < 0) | |
242 | return AVERROR(ENOMEM); | |
243 | ||
244 | avio_wb32(pb, s->nb_streams); | |
245 | bit_rate = 0; | |
246 | for(i=0;i<s->nb_streams;i++) { | |
247 | st = s->streams[i]; | |
248 | bit_rate += st->codec->bit_rate; | |
249 | } | |
250 | avio_wb32(pb, bit_rate); | |
251 | ||
252 | write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N')); | |
253 | ||
254 | /* list of streams */ | |
255 | for(i=0;i<s->nb_streams;i++) { | |
256 | st = s->streams[i]; | |
257 | avpriv_set_pts_info(st, 64, 1, 1000000); | |
258 | if(avio_open_dyn_buf(&pb) < 0) | |
259 | return AVERROR(ENOMEM); | |
260 | ||
261 | codec = st->codec; | |
262 | /* generic info */ | |
263 | avio_wb32(pb, codec->codec_id); | |
264 | avio_w8(pb, codec->codec_type); | |
265 | avio_wb32(pb, codec->bit_rate); | |
266 | avio_wb32(pb, codec->flags); | |
267 | avio_wb32(pb, codec->flags2); | |
268 | avio_wb32(pb, codec->debug); | |
269 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { | |
270 | avio_wb32(pb, codec->extradata_size); | |
271 | avio_write(pb, codec->extradata, codec->extradata_size); | |
272 | } | |
273 | write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M')); | |
2ba45a60 DM |
274 | /* specific info */ |
275 | switch(codec->codec_type) { | |
276 | case AVMEDIA_TYPE_VIDEO: | |
f6fa7814 DM |
277 | if (st->recommended_encoder_configuration) { |
278 | av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n", | |
279 | st->recommended_encoder_configuration); | |
280 | if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), | |
281 | st->recommended_encoder_configuration)) < 0) | |
282 | return ret; | |
283 | } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 || | |
284 | (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0) | |
285 | return ret; | |
2ba45a60 DM |
286 | break; |
287 | case AVMEDIA_TYPE_AUDIO: | |
f6fa7814 DM |
288 | if (st->recommended_encoder_configuration) { |
289 | av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n", | |
290 | st->recommended_encoder_configuration); | |
291 | if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), | |
292 | st->recommended_encoder_configuration)) < 0) | |
293 | return ret; | |
294 | } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 || | |
295 | (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0) | |
296 | return ret; | |
2ba45a60 DM |
297 | break; |
298 | default: | |
299 | return -1; | |
300 | } | |
301 | } | |
302 | pb = s->pb; | |
303 | ||
304 | avio_wb64(pb, 0); // end of header | |
305 | ||
306 | /* flush until end of block reached */ | |
307 | while ((avio_tell(pb) % ffm->packet_size) != 0) | |
308 | avio_w8(pb, 0); | |
309 | ||
310 | avio_flush(pb); | |
311 | ||
312 | /* init packet mux */ | |
313 | ffm->packet_ptr = ffm->packet; | |
314 | ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE; | |
315 | av_assert0(ffm->packet_end >= ffm->packet); | |
316 | ffm->frame_offset = 0; | |
317 | ffm->dts = 0; | |
318 | ffm->first_packet = 1; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt) | |
324 | { | |
325 | FFMContext *ffm = s->priv_data; | |
326 | int64_t dts; | |
327 | uint8_t header[FRAME_HEADER_SIZE+4]; | |
328 | int header_size = FRAME_HEADER_SIZE; | |
329 | ||
330 | dts = ffm->start_time + pkt->dts; | |
331 | /* packet size & key_frame */ | |
332 | header[0] = pkt->stream_index; | |
333 | header[1] = 0; | |
334 | if (pkt->flags & AV_PKT_FLAG_KEY) | |
335 | header[1] |= FLAG_KEY_FRAME; | |
336 | AV_WB24(header+2, pkt->size); | |
337 | AV_WB24(header+5, pkt->duration); | |
338 | AV_WB64(header+8, ffm->start_time + pkt->pts); | |
339 | if (pkt->pts != pkt->dts) { | |
340 | header[1] |= FLAG_DTS; | |
341 | AV_WB32(header+16, pkt->pts - pkt->dts); | |
342 | header_size += 4; | |
343 | } | |
344 | ffm_write_data(s, header, header_size, dts, 1); | |
345 | ffm_write_data(s, pkt->data, pkt->size, dts, 0); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static int ffm_write_trailer(AVFormatContext *s) | |
351 | { | |
352 | FFMContext *ffm = s->priv_data; | |
353 | ||
354 | /* flush packets */ | |
355 | if (ffm->packet_ptr > ffm->packet) | |
356 | flush_packet(s); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | AVOutputFormat ff_ffm_muxer = { | |
362 | .name = "ffm", | |
363 | .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), | |
364 | .extensions = "ffm", | |
365 | .priv_data_size = sizeof(FFMContext), | |
366 | .audio_codec = AV_CODEC_ID_MP2, | |
367 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, | |
368 | .write_header = ffm_write_header, | |
369 | .write_packet = ffm_write_packet, | |
370 | .write_trailer = ffm_write_trailer, | |
371 | .flags = AVFMT_TS_NEGATIVE, | |
372 | }; |