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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" | |
26 | #include "avformat.h" | |
27 | #include "internal.h" | |
28 | #include "ffm.h" | |
29 | ||
30 | static void flush_packet(AVFormatContext *s) | |
31 | { | |
32 | FFMContext *ffm = s->priv_data; | |
33 | int fill_size, h; | |
34 | AVIOContext *pb = s->pb; | |
35 | ||
36 | fill_size = ffm->packet_end - ffm->packet_ptr; | |
37 | memset(ffm->packet_ptr, 0, fill_size); | |
38 | ||
39 | av_assert1(avio_tell(pb) % ffm->packet_size == 0); | |
40 | ||
41 | /* put header */ | |
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) | |
47 | h |= 0x8000; | |
48 | avio_wb16(pb, h); | |
49 | avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet); | |
50 | avio_flush(pb); | |
51 | ||
52 | /* prepare next packet */ | |
53 | ffm->frame_offset = 0; /* no key frame */ | |
54 | ffm->packet_ptr = ffm->packet; | |
55 | ffm->first_packet = 0; | |
56 | } | |
57 | ||
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) | |
62 | { | |
63 | FFMContext *ffm = s->priv_data; | |
64 | int len; | |
65 | ||
66 | if (header && ffm->frame_offset == 0) { | |
67 | ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE; | |
68 | ffm->dts = dts; | |
69 | } | |
70 | ||
71 | /* write as many packets as needed */ | |
72 | while (size > 0) { | |
73 | len = ffm->packet_end - ffm->packet_ptr; | |
74 | if (len > size) | |
75 | len = size; | |
76 | memcpy(ffm->packet_ptr, buf, len); | |
77 | ||
78 | ffm->packet_ptr += len; | |
79 | buf += len; | |
80 | size -= len; | |
81 | if (ffm->packet_ptr >= ffm->packet_end) | |
82 | flush_packet(s); | |
83 | } | |
84 | } | |
85 | ||
86 | static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id) | |
87 | { | |
88 | uint8_t *dyn_buf; | |
89 | int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf); | |
90 | avio_wb32(pb, id); | |
91 | avio_wb32(pb, dyn_size); | |
92 | avio_write(pb, dyn_buf, dyn_size); | |
93 | av_free(dyn_buf); | |
94 | } | |
95 | ||
96 | static int ffm_write_header(AVFormatContext *s) | |
97 | { | |
98 | FFMContext *ffm = s->priv_data; | |
99 | AVDictionaryEntry *t; | |
100 | AVStream *st; | |
101 | AVIOContext *pb = s->pb; | |
102 | AVCodecContext *codec; | |
103 | int bit_rate, i; | |
104 | ||
105 | if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) { | |
106 | int ret = av_parse_time(&ffm->start_time, t->value, 0); | |
107 | if (ret < 0) | |
108 | return ret; | |
109 | } | |
110 | ||
111 | ffm->packet_size = FFM_PACKET_SIZE; | |
112 | ||
113 | /* header */ | |
114 | avio_wl32(pb, MKTAG('F', 'F', 'M', '2')); | |
115 | avio_wb32(pb, ffm->packet_size); | |
116 | avio_wb64(pb, 0); /* current write position */ | |
117 | ||
118 | if(avio_open_dyn_buf(&pb) < 0) | |
119 | return AVERROR(ENOMEM); | |
120 | ||
121 | avio_wb32(pb, s->nb_streams); | |
122 | bit_rate = 0; | |
123 | for(i=0;i<s->nb_streams;i++) { | |
124 | st = s->streams[i]; | |
125 | bit_rate += st->codec->bit_rate; | |
126 | } | |
127 | avio_wb32(pb, bit_rate); | |
128 | ||
129 | write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N')); | |
130 | ||
131 | /* list of streams */ | |
132 | for(i=0;i<s->nb_streams;i++) { | |
133 | st = s->streams[i]; | |
134 | avpriv_set_pts_info(st, 64, 1, 1000000); | |
135 | if(avio_open_dyn_buf(&pb) < 0) | |
136 | return AVERROR(ENOMEM); | |
137 | ||
138 | codec = st->codec; | |
139 | /* generic info */ | |
140 | avio_wb32(pb, codec->codec_id); | |
141 | avio_w8(pb, codec->codec_type); | |
142 | avio_wb32(pb, codec->bit_rate); | |
143 | avio_wb32(pb, codec->flags); | |
144 | avio_wb32(pb, codec->flags2); | |
145 | avio_wb32(pb, codec->debug); | |
146 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { | |
147 | avio_wb32(pb, codec->extradata_size); | |
148 | avio_write(pb, codec->extradata, codec->extradata_size); | |
149 | } | |
150 | write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M')); | |
151 | if(avio_open_dyn_buf(&pb) < 0) | |
152 | return AVERROR(ENOMEM); | |
153 | /* specific info */ | |
154 | switch(codec->codec_type) { | |
155 | case AVMEDIA_TYPE_VIDEO: | |
156 | avio_wb32(pb, codec->time_base.num); | |
157 | avio_wb32(pb, codec->time_base.den); | |
158 | avio_wb16(pb, codec->width); | |
159 | avio_wb16(pb, codec->height); | |
160 | avio_wb16(pb, codec->gop_size); | |
161 | avio_wb32(pb, codec->pix_fmt); | |
162 | avio_w8(pb, codec->qmin); | |
163 | avio_w8(pb, codec->qmax); | |
164 | avio_w8(pb, codec->max_qdiff); | |
165 | avio_wb16(pb, (int) (codec->qcompress * 10000.0)); | |
166 | avio_wb16(pb, (int) (codec->qblur * 10000.0)); | |
167 | avio_wb32(pb, codec->bit_rate_tolerance); | |
168 | avio_put_str(pb, codec->rc_eq ? codec->rc_eq : "tex^qComp"); | |
169 | avio_wb32(pb, codec->rc_max_rate); | |
170 | avio_wb32(pb, codec->rc_min_rate); | |
171 | avio_wb32(pb, codec->rc_buffer_size); | |
172 | avio_wb64(pb, av_double2int(codec->i_quant_factor)); | |
173 | avio_wb64(pb, av_double2int(codec->b_quant_factor)); | |
174 | avio_wb64(pb, av_double2int(codec->i_quant_offset)); | |
175 | avio_wb64(pb, av_double2int(codec->b_quant_offset)); | |
176 | avio_wb32(pb, codec->dct_algo); | |
177 | avio_wb32(pb, codec->strict_std_compliance); | |
178 | avio_wb32(pb, codec->max_b_frames); | |
179 | avio_wb32(pb, codec->mpeg_quant); | |
180 | avio_wb32(pb, codec->intra_dc_precision); | |
181 | avio_wb32(pb, codec->me_method); | |
182 | avio_wb32(pb, codec->mb_decision); | |
183 | avio_wb32(pb, codec->nsse_weight); | |
184 | avio_wb32(pb, codec->frame_skip_cmp); | |
185 | avio_wb64(pb, av_double2int(codec->rc_buffer_aggressivity)); | |
186 | avio_wb32(pb, codec->codec_tag); | |
187 | avio_w8(pb, codec->thread_count); | |
188 | avio_wb32(pb, codec->coder_type); | |
189 | avio_wb32(pb, codec->me_cmp); | |
190 | avio_wb32(pb, codec->me_subpel_quality); | |
191 | avio_wb32(pb, codec->me_range); | |
192 | avio_wb32(pb, codec->keyint_min); | |
193 | avio_wb32(pb, codec->scenechange_threshold); | |
194 | avio_wb32(pb, codec->b_frame_strategy); | |
195 | avio_wb64(pb, av_double2int(codec->qcompress)); | |
196 | avio_wb64(pb, av_double2int(codec->qblur)); | |
197 | avio_wb32(pb, codec->max_qdiff); | |
198 | avio_wb32(pb, codec->refs); | |
199 | write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'V', 'I')); | |
200 | break; | |
201 | case AVMEDIA_TYPE_AUDIO: | |
202 | avio_wb32(pb, codec->sample_rate); | |
203 | avio_wl16(pb, codec->channels); | |
204 | avio_wl16(pb, codec->frame_size); | |
205 | write_header_chunk(s->pb, pb, MKBETAG('S', 'T', 'A', 'U')); | |
206 | break; | |
207 | default: | |
208 | return -1; | |
209 | } | |
210 | } | |
211 | pb = s->pb; | |
212 | ||
213 | avio_wb64(pb, 0); // end of header | |
214 | ||
215 | /* flush until end of block reached */ | |
216 | while ((avio_tell(pb) % ffm->packet_size) != 0) | |
217 | avio_w8(pb, 0); | |
218 | ||
219 | avio_flush(pb); | |
220 | ||
221 | /* init packet mux */ | |
222 | ffm->packet_ptr = ffm->packet; | |
223 | ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE; | |
224 | av_assert0(ffm->packet_end >= ffm->packet); | |
225 | ffm->frame_offset = 0; | |
226 | ffm->dts = 0; | |
227 | ffm->first_packet = 1; | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt) | |
233 | { | |
234 | FFMContext *ffm = s->priv_data; | |
235 | int64_t dts; | |
236 | uint8_t header[FRAME_HEADER_SIZE+4]; | |
237 | int header_size = FRAME_HEADER_SIZE; | |
238 | ||
239 | dts = ffm->start_time + pkt->dts; | |
240 | /* packet size & key_frame */ | |
241 | header[0] = pkt->stream_index; | |
242 | header[1] = 0; | |
243 | if (pkt->flags & AV_PKT_FLAG_KEY) | |
244 | header[1] |= FLAG_KEY_FRAME; | |
245 | AV_WB24(header+2, pkt->size); | |
246 | AV_WB24(header+5, pkt->duration); | |
247 | AV_WB64(header+8, ffm->start_time + pkt->pts); | |
248 | if (pkt->pts != pkt->dts) { | |
249 | header[1] |= FLAG_DTS; | |
250 | AV_WB32(header+16, pkt->pts - pkt->dts); | |
251 | header_size += 4; | |
252 | } | |
253 | ffm_write_data(s, header, header_size, dts, 1); | |
254 | ffm_write_data(s, pkt->data, pkt->size, dts, 0); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static int ffm_write_trailer(AVFormatContext *s) | |
260 | { | |
261 | FFMContext *ffm = s->priv_data; | |
262 | ||
263 | /* flush packets */ | |
264 | if (ffm->packet_ptr > ffm->packet) | |
265 | flush_packet(s); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | AVOutputFormat ff_ffm_muxer = { | |
271 | .name = "ffm", | |
272 | .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), | |
273 | .extensions = "ffm", | |
274 | .priv_data_size = sizeof(FFMContext), | |
275 | .audio_codec = AV_CODEC_ID_MP2, | |
276 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, | |
277 | .write_header = ffm_write_header, | |
278 | .write_packet = ffm_write_packet, | |
279 | .write_trailer = ffm_write_trailer, | |
280 | .flags = AVFMT_TS_NEGATIVE, | |
281 | }; |