FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dvenc.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 199 231 86.1%
Branches: 88 136 64.7%

Line Branch Exec Source
1 /*
2 * General DV muxer/demuxer
3 * Copyright (c) 2003 Roman Shaposhnik
4 *
5 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6 * of DV technical info.
7 *
8 * Raw DV format
9 * Copyright (c) 2002 Fabrice Bellard
10 *
11 * 50 Mbps (DVCPRO50) support
12 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
13 *
14 * This file is part of FFmpeg.
15 *
16 * FFmpeg is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU Lesser General Public
18 * License as published by the Free Software Foundation; either
19 * version 2.1 of the License, or (at your option) any later version.
20 *
21 * FFmpeg is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * Lesser General Public License for more details.
25 *
26 * You should have received a copy of the GNU Lesser General Public
27 * License along with FFmpeg; if not, write to the Free Software
28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 */
30 #include <time.h>
31
32 #include "libavutil/time_internal.h"
33 #include "avformat.h"
34 #include "libavcodec/dv_profile.h"
35 #include "libavcodec/dv.h"
36 #include "dv.h"
37 #include "mux.h"
38 #include "libavutil/avassert.h"
39 #include "libavutil/fifo.h"
40 #include "libavutil/mathematics.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/timecode.h"
43
44 #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
45
46 typedef struct DVMuxContext {
47 AVClass *av_class;
48 const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
49 int n_ast; /* number of stereo audio streams (up to 2) */
50 AVStream *ast[4]; /* stereo audio streams */
51 AVFifo *audio_data[4]; /* FIFO for storing excessive amounts of PCM */
52 int frames; /* current frame number */
53 int64_t start_time; /* recording start time */
54 int has_audio; /* frame under construction has audio */
55 int has_video; /* frame under construction has video */
56 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
57 AVTimecode tc; /* timecode context */
58 } DVMuxContext;
59
60 static const int dv_aaux_packs_dist[12][9] = {
61 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
62 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
63 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
64 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
65 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
66 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
67 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
68 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
69 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
70 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
71 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
72 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
73 };
74
75 361388 static void brktimegm(time_t secs, struct tm *tm)
76 {
77 361388 tm = gmtime_r(&secs, tm);
78
79 361388 tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */
80 361388 tm->tm_mon += 1; /* unlike gmtime_r tm_mon is from 1 to 12 */
81 361388 }
82
83 1183 static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
84 {
85
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1183 if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
86
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791 if (sample_rate == 32000) return 1280;
87
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791 else if (sample_rate == 44100) return 1764;
88 791 else return 1920;
89 }
90
91
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392 av_assert0(sample_rate == 48000);
92
93 392 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
94 sizeof(sys->audio_samples_dist[0]))];
95 }
96
97 637498 static int dv_write_pack(enum DVPackType pack_id, DVMuxContext *c, uint8_t* buf, int channel, int seq)
98 {
99 struct tm tc;
100 time_t ct;
101 uint32_t timecode;
102 637498 int audio_type = 0;
103
104 637498 buf[0] = (uint8_t)pack_id;
105
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637498 switch (pack_id) {
106 269880 case DV_TIMECODE:
107 269880 timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
108 269880 timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
109 269880 AV_WB32(buf + 1, timecode);
110 269880 break;
111 890 case DV_AUDIO_SOURCE: /* AAUX source pack */
112
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890 if (c->ast[channel]->codecpar->sample_rate == 44100) {
113 audio_type = 1;
114
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890 } else if (c->ast[channel]->codecpar->sample_rate == 32000)
115 audio_type = 2;
116 890 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
117 890 (1 << 6) | /* reserved -- always 1 */
118 890 (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
119 890 c->sys->audio_min_samples[audio_type]);
120 /* # of samples */
121 890 buf[2] = (0 << 7) | /* multi-stereo */
122 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
123 890 (0 << 4) | /* pair bit: 0 -- one pair of channels */
124 890 (seq >= c->sys->difseg_size/2); /* audio mode (1st or 2nd channel) */
125 890 buf[3] = (1 << 7) | /* res */
126 890 (1 << 6) | /* multi-language flag */
127 890 (c->sys->dsf << 5) | /* system: 60fields/50fields */
128
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890 (DV_PROFILE_IS_HD(c->sys) ? 0x3 : c->sys->video_stype ? 2 : 0); /* stype */
129 890 buf[4] = (1 << 7) | /* emphasis: 1 -- off */
130 (0 << 6) | /* emphasis time constant: 0 -- reserved */
131 890 (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
132 0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */
133
134 890 break;
135 890 case DV_AUDIO_CONTROL:
136 890 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
137 (1 << 4) | /* input source: 1 -- digital input */
138 (3 << 2) | /* compression: 3 -- no information */
139 0; /* misc. info/SMPTE emphasis off */
140 890 buf[2] = (1 << 7) | /* recording start point: 1 -- no */
141 (1 << 6) | /* recording end point: 1 -- no */
142 (1 << 3) | /* recording mode: 1 -- original */
143 7;
144 600 buf[3] = (1 << 7) | /* direction: 1 -- forward */
145
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890 (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
146 290 c->sys->ltc_divisor * 4);
147 890 buf[4] = (1 << 7) | /* reserved -- always 1 */
148 0x7f; /* genre category */
149 890 break;
150 180694 case DV_AUDIO_RECDATE:
151 case DV_VIDEO_RECDATE: /* VAUX recording date */
152 180694 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
153 180694 c->sys->time_base.den, AV_ROUND_DOWN);
154 180694 brktimegm(ct, &tc);
155 180694 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
156 /* 0xff is very likely to be "unknown" */
157 180694 buf[2] = (3 << 6) | /* reserved -- always 1 */
158 180694 ((tc.tm_mday / 10) << 4) | /* Tens of day */
159 180694 (tc.tm_mday % 10); /* Units of day */
160 180694 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
161 180694 ((tc.tm_mon / 10) << 4) | /* Tens of month */
162 180694 (tc.tm_mon % 10); /* Units of month */
163 180694 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
164 180694 (tc.tm_year % 10); /* Units of year */
165 180694 break;
166 180694 case DV_AUDIO_RECTIME: /* AAUX recording time */
167 case DV_VIDEO_RECTIME: /* VAUX recording time */
168 180694 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
169 180694 c->sys->time_base.den, AV_ROUND_DOWN);
170 180694 brktimegm(ct, &tc);
171 180694 buf[1] = (3 << 6) | /* reserved -- always 1 */
172 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
173 180694 buf[2] = (1 << 7) | /* reserved -- always 1 */
174 180694 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
175 180694 (tc.tm_sec % 10); /* Units of seconds */
176 180694 buf[3] = (1 << 7) | /* reserved -- always 1 */
177 180694 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
178 180694 (tc.tm_min % 10); /* Units of minutes */
179 180694 buf[4] = (3 << 6) | /* reserved -- always 1 */
180 180694 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
181 180694 (tc.tm_hour % 10); /* Units of hours */
182 180694 break;
183 4450 default:
184 4450 buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
185 }
186 637498 return 5;
187 }
188
189 79 static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
190 {
191 int i, j, d, of, size;
192 79 size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
193 79 frame_ptr += channel * c->sys->difseg_size * 150 * 80;
194
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969 for (i = 0; i < c->sys->difseg_size; i++) {
195 890 frame_ptr += 6 * 80; /* skip DIF segment header */
196
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8900 for (j = 0; j < 9; j++) {
197 8010 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i);
198
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296370 for (d = 8; d < 80; d+=2) {
199 288360 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
200
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288360 if (of*2 >= size)
201 3468 continue;
202
203 // FIXME: maybe we have to admit that DV is a big-endian PCM
204 284892 av_fifo_peek(c->audio_data[channel], frame_ptr + d, 2, of * 2);
205 284892 FFSWAP(uint8_t, frame_ptr[d], frame_ptr[d + 1]);
206 }
207 8010 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
208 }
209 }
210 79 }
211
212 929 static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
213 {
214 int j, k;
215 uint8_t* buf;
216 929 int seq = 0;
217
218
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23419 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80, seq++) {
219 /* DV subcode: 2nd and 3d DIFs */
220
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67470 for (j = 80; j < 80 * 3; j += 80) {
221
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314860 for (k = 6; k < 6 * 8; k += 8)
222 269880 dv_write_pack(DV_TIMECODE, c, &buf[j+k], 0, seq);
223
224
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44980 if (((long)(buf-frame)/(c->sys->frame_size/(c->sys->difseg_size*c->sys->n_difchan))%c->sys->difseg_size) > 5) { /* FIXME: is this really needed ? */
225 22432 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+14], 0, seq);
226 22432 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+22], 0, seq);
227 22432 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+38], 0, seq);
228 22432 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+46], 0, seq);
229 }
230 }
231
232 /* DV VAUX: 4th, 5th and 6th 3DIFs */
233
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89960 for (j = 80*3 + 3; j < 80*6; j += 80) {
234 67470 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+5* 2], 0, seq);
235 67470 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5* 3], 0, seq);
236 67470 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+5*11], 0, seq);
237 67470 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5*12], 0, seq);
238 }
239 }
240 929 }
241
242 /*
243 * The following 3 functions constitute our interface to the world
244 */
245
246 1065 static int dv_assemble_frame(AVFormatContext *s,
247 DVMuxContext *c, AVStream* st,
248 const uint8_t *data, int data_size, uint8_t **frame)
249 {
250 int i, reqasize;
251
252 1065 *frame = &c->frame_buf[0];
253
254
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1065 switch (st->codecpar->codec_type) {
255 930 case AVMEDIA_TYPE_VIDEO:
256 /* FIXME: we have to have more sensible approach than this one */
257
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930 if (c->has_video) {
258 av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
259 return AVERROR(EINVAL);
260 }
261
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930 if (data_size != c->sys->frame_size) {
262 av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
263 data_size, c->sys->frame_size);
264 return AVERROR(ENOSYS);
265 }
266
267 930 memcpy(*frame, data, c->sys->frame_size);
268 930 c->has_video = 1;
269 930 break;
270 135 case AVMEDIA_TYPE_AUDIO:
271
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135 for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
272
273 /* FIXME: we have to have more sensible approach than this one */
274
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135 if (av_fifo_can_write(c->audio_data[i]) < data_size) {
275 av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
276 return AVERROR(EINVAL);
277 }
278 135 av_fifo_write(c->audio_data[i], data, data_size);
279
280 135 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
281
282 /* Let us see if we've got enough audio for one DV frame. */
283 135 c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i);
284
285 135 break;
286 default:
287 break;
288 }
289
290 /* Let us see if we have enough data to construct one DV frame. */
291
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1065 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
292 929 dv_inject_metadata(c, *frame);
293 929 c->has_audio = 0;
294
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1008 for (i=0; i < c->n_ast; i++) {
295 79 dv_inject_audio(c, i, *frame);
296 79 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
297 79 av_fifo_drain2(c->audio_data[i], reqasize);
298 79 c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i);
299 }
300
301 929 c->has_video = 0;
302
303 929 c->frames++;
304
305 929 return c->sys->frame_size;
306 }
307
308 136 return 0;
309 }
310
311 20 static DVMuxContext* dv_init_mux(AVFormatContext* s)
312 {
313 20 DVMuxContext *c = s->priv_data;
314 20 AVStream *vst = NULL;
315 int i;
316
317 /* we support at most 1 video and 2 audio streams */
318
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20 if (s->nb_streams > 5)
319 return NULL;
320
321 /* We have to sort out where audio and where video stream is */
322
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43 for (i=0; i<s->nb_streams; i++) {
323 23 AVStream *st = s->streams[i];
324
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23 switch (st->codecpar->codec_type) {
325 20 case AVMEDIA_TYPE_VIDEO:
326
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20 if (vst) return NULL;
327
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20 if (st->codecpar->codec_id != AV_CODEC_ID_DVVIDEO)
328 goto bail_out;
329 20 vst = st;
330 20 break;
331 3 case AVMEDIA_TYPE_AUDIO:
332
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3 if (c->n_ast > 1) return NULL;
333 /* Some checks -- DV format is very picky about its incoming streams */
334
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3 if(st->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE ||
335
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3 st->codecpar->ch_layout.nb_channels != 2)
336 goto bail_out;
337
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3 if (st->codecpar->sample_rate != 48000 &&
338 st->codecpar->sample_rate != 44100 &&
339 st->codecpar->sample_rate != 32000 )
340 goto bail_out;
341 3 c->ast[c->n_ast++] = st;
342 3 break;
343 default:
344 goto bail_out;
345 }
346 }
347
348
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20 if (!vst)
349 goto bail_out;
350
351 40 c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height,
352 20 vst->codecpar->format, vst->time_base);
353
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20 if (!c->sys)
354 goto bail_out;
355
356
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20 if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
357
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1 if (c->ast[0] && c->ast[0]->codecpar->sample_rate != 48000)
358 goto bail_out;
359
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1 if (c->ast[1] && c->ast[1]->codecpar->sample_rate != 48000)
360 goto bail_out;
361 }
362
363
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20 if (((c->n_ast > 1) && (c->sys->n_difchan < 2)) ||
364
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20 ((c->n_ast > 2) && (c->sys->n_difchan < 4))) {
365 /* only 2 stereo pairs allowed in 50Mbps mode */
366 goto bail_out;
367 }
368
369 /* Ok, everything seems to be in working order */
370 20 c->frames = 0;
371 20 c->has_audio = 0;
372 20 c->has_video = 0;
373 20 ff_parse_creation_time_metadata(s, &c->start_time, 1);
374
375
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23 for (i=0; i < c->n_ast; i++) {
376
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3 if (!c->ast[i])
377 continue;
378 3 c->audio_data[i] = av_fifo_alloc2(100 * MAX_AUDIO_FRAME_SIZE, 1, 0);
379
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3 if (!c->audio_data[i])
380 goto bail_out;
381 }
382
383 20 return c;
384
385 bail_out:
386 return NULL;
387 }
388
389 20 static int dv_write_header(AVFormatContext *s)
390 {
391 AVRational rate;
392 20 DVMuxContext *dvc = s->priv_data;
393 20 AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
394
395
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20 if (!dv_init_mux(s)) {
396 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
397 "Make sure that you supply exactly two streams:\n"
398 " video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
399 " (50Mbps allows an optional second audio stream)\n");
400 return -1;
401 }
402 20 rate.num = dvc->sys->ltc_divisor;
403 20 rate.den = 1;
404
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20 if (!tcr) { // no global timecode, look into the streams
405 int i;
406
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37 for (i = 0; i < s->nb_streams; i++) {
407 19 tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
408
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19 if (tcr)
409 break;
410 }
411 }
412
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20 if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
413 2 return 0;
414 18 return av_timecode_init(&dvc->tc, rate, 0, 0, s);
415 }
416
417 1065 static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
418 {
419 uint8_t* frame;
420 int fsize;
421
422 1065 fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
423 1065 pkt->data, pkt->size, &frame);
424
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1065 if (fsize < 0) {
425 return fsize;
426 }
427 1065 avio_write(s->pb, frame, fsize);
428 1065 return 0;
429 }
430
431 /*
432 * We might end up with some extra A/V data without matching counterpart.
433 * E.g. video data without enough audio to write the complete frame.
434 * Currently we simply drop the last frame. I don't know whether this
435 * is the best strategy of all
436 */
437 20 static void dv_deinit(AVFormatContext *s)
438 {
439 20 DVMuxContext *c = s->priv_data;
440
441
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23 for (int i = 0; i < c->n_ast; i++)
442 3 av_fifo_freep2(&c->audio_data[i]);
443 20 }
444
445 const AVOutputFormat ff_dv_muxer = {
446 .name = "dv",
447 .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
448 .extensions = "dv",
449 .priv_data_size = sizeof(DVMuxContext),
450 .audio_codec = AV_CODEC_ID_PCM_S16LE,
451 .video_codec = AV_CODEC_ID_DVVIDEO,
452 .write_header = dv_write_header,
453 .write_packet = dv_write_packet,
454 .deinit = dv_deinit,
455 };
456