FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dvenc.c
Date: 2025-11-03 14:06:37
Exec Total Coverage
Lines: 199 249 79.9%
Functions: 10 10 100.0%
Branches: 91 134 67.9%
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/pixdesc.h"
43 #include "libavutil/timecode.h"
44
45 #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
46
47 typedef struct DVMuxContext {
48 AVClass *av_class;
49 const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
50 int n_ast; /* number of stereo audio streams (up to 2) */
51 AVStream *ast[4]; /* stereo audio streams */
52 AVFifo *audio_data[4]; /* FIFO for storing excessive amounts of PCM */
53 int frames; /* current frame number */
54 int64_t start_time; /* recording start time */
55 int has_audio; /* frame under construction has audio */
56 int has_video; /* frame under construction has video */
57 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
58 AVTimecode tc; /* timecode context */
59 } DVMuxContext;
60
61 static const int dv_aaux_packs_dist[12][9] = {
62 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
63 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
64 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
65 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
66 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
67 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
68 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
69 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
70 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
71 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
72 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
73 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
74 };
75
76 361388 static void brktimegm(time_t secs, struct tm *tm)
77 {
78 361388 tm = gmtime_r(&secs, tm);
79
80 361388 tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */
81 361388 tm->tm_mon += 1; /* unlike gmtime_r tm_mon is from 1 to 12 */
82 361388 }
83
84 1082 static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
85 {
86
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 1082 if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
87
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 723 if (sample_rate == 32000) return 1280;
88
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 723 else if (sample_rate == 44100) return 1764;
89 723 else return 1920;
90 }
91
92
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 359 av_assert0(sample_rate == 48000);
93
94 359 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
95 sizeof(sys->audio_samples_dist[0]))];
96 }
97
98 637498 static int dv_write_pack(enum DVPackType pack_id, DVMuxContext *c, uint8_t* buf, int channel, int seq)
99 {
100 struct tm tc;
101 time_t ct;
102 uint32_t timecode;
103 637498 int audio_type = 0;
104
105 637498 buf[0] = (uint8_t)pack_id;
106
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 637498 switch (pack_id) {
107 269880 case DV_TIMECODE:
108 269880 timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
109 269880 timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
110 269880 AV_WB32(buf + 1, timecode);
111 269880 break;
112 890 case DV_AUDIO_SOURCE: /* AAUX source pack */
113
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 890 if (c->ast[channel]->codecpar->sample_rate == 44100) {
114 ✗ audio_type = 1;
115
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 890 } else if (c->ast[channel]->codecpar->sample_rate == 32000)
116 ✗ audio_type = 2;
117 890 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
118 890 (1 << 6) | /* reserved -- always 1 */
119 890 (dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
120 890 c->sys->audio_min_samples[audio_type]);
121 /* # of samples */
122 890 buf[2] = (0 << 7) | /* multi-stereo */
123 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
124 890 (0 << 4) | /* pair bit: 0 -- one pair of channels */
125 890 (seq >= c->sys->difseg_size/2); /* audio mode (1st or 2nd channel) */
126 890 buf[3] = (1 << 7) | /* res */
127 890 (1 << 6) | /* multi-language flag */
128 890 (c->sys->dsf << 5) | /* system: 60fields/50fields */
129
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 890 (DV_PROFILE_IS_HD(c->sys) ? 0x3 : c->sys->video_stype ? 2 : 0); /* stype */
130 890 buf[4] = (1 << 7) | /* emphasis: 1 -- off */
131 (0 << 6) | /* emphasis time constant: 0 -- reserved */
132 890 (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
133 0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */
134
135 890 break;
136 890 case DV_AUDIO_CONTROL:
137 890 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
138 (1 << 4) | /* input source: 1 -- digital input */
139 (3 << 2) | /* compression: 3 -- no information */
140 0; /* misc. info/SMPTE emphasis off */
141 890 buf[2] = (1 << 7) | /* recording start point: 1 -- no */
142 (1 << 6) | /* recording end point: 1 -- no */
143 (1 << 3) | /* recording mode: 1 -- original */
144 7;
145 600 buf[3] = (1 << 7) | /* direction: 1 -- forward */
146
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 890 (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
147 290 c->sys->ltc_divisor * 4);
148 890 buf[4] = (1 << 7) | /* reserved -- always 1 */
149 0x7f; /* genre category */
150 890 break;
151 180694 case DV_AUDIO_RECDATE:
152 case DV_VIDEO_RECDATE: /* VAUX recording date */
153 180694 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
154 180694 c->sys->time_base.den, AV_ROUND_DOWN);
155 180694 brktimegm(ct, &tc);
156 180694 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
157 /* 0xff is very likely to be "unknown" */
158 180694 buf[2] = (3 << 6) | /* reserved -- always 1 */
159 180694 ((tc.tm_mday / 10) << 4) | /* Tens of day */
160 180694 (tc.tm_mday % 10); /* Units of day */
161 180694 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
162 180694 ((tc.tm_mon / 10) << 4) | /* Tens of month */
163 180694 (tc.tm_mon % 10); /* Units of month */
164 180694 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
165 180694 (tc.tm_year % 10); /* Units of year */
166 180694 break;
167 180694 case DV_AUDIO_RECTIME: /* AAUX recording time */
168 case DV_VIDEO_RECTIME: /* VAUX recording time */
169 180694 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
170 180694 c->sys->time_base.den, AV_ROUND_DOWN);
171 180694 brktimegm(ct, &tc);
172 180694 buf[1] = (3 << 6) | /* reserved -- always 1 */
173 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
174 180694 buf[2] = (1 << 7) | /* reserved -- always 1 */
175 180694 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
176 180694 (tc.tm_sec % 10); /* Units of seconds */
177 180694 buf[3] = (1 << 7) | /* reserved -- always 1 */
178 180694 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
179 180694 (tc.tm_min % 10); /* Units of minutes */
180 180694 buf[4] = (3 << 6) | /* reserved -- always 1 */
181 180694 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
182 180694 (tc.tm_hour % 10); /* Units of hours */
183 180694 break;
184 4450 default:
185 4450 buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
186 }
187 637498 return 5;
188 }
189
190 79 static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
191 {
192 int i, j, d, of, size;
193 79 size = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate);
194 79 frame_ptr += channel * c->sys->difseg_size * 150 * 80;
195
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 969 for (i = 0; i < c->sys->difseg_size; i++) {
196 890 frame_ptr += 6 * 80; /* skip DIF segment header */
197
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 8900 for (j = 0; j < 9; j++) {
198 8010 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], channel, i);
199
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 296370 for (d = 8; d < 80; d+=2) {
200 288360 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
201
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 288360 if (of*2 >= size)
202 3468 continue;
203
204 // FIXME: maybe we have to admit that DV is a big-endian PCM
205 284892 av_fifo_peek(c->audio_data[channel], frame_ptr + d, 2, of * 2);
206 284892 FFSWAP(uint8_t, frame_ptr[d], frame_ptr[d + 1]);
207 }
208 8010 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
209 }
210 }
211 79 }
212
213 929 static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
214 {
215 int j, k;
216 uint8_t* buf;
217 929 int seq = 0;
218
219
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 23419 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80, seq++) {
220 /* DV subcode: 2nd and 3d DIFs */
221
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 67470 for (j = 80; j < 80 * 3; j += 80) {
222
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 314860 for (k = 6; k < 6 * 8; k += 8)
223 269880 dv_write_pack(DV_TIMECODE, c, &buf[j+k], 0, seq);
224
225
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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 ? */
226 22432 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+14], 0, seq);
227 22432 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+22], 0, seq);
228 22432 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+38], 0, seq);
229 22432 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+46], 0, seq);
230 }
231 }
232
233 /* DV VAUX: 4th, 5th and 6th 3DIFs */
234
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 89960 for (j = 80*3 + 3; j < 80*6; j += 80) {
235 67470 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+5* 2], 0, seq);
236 67470 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5* 3], 0, seq);
237 67470 dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+5*11], 0, seq);
238 67470 dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5*12], 0, seq);
239 }
240 }
241 929 }
242
243 /*
244 * The following 3 functions constitute our interface to the world
245 */
246
247 964 static int dv_assemble_frame(AVFormatContext *s,
248 DVMuxContext *c, AVStream* st,
249 const uint8_t *data, int data_size, uint8_t **frame)
250 {
251 int i, reqasize;
252
253 964 *frame = &c->frame_buf[0];
254
255
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 964 switch (st->codecpar->codec_type) {
256 930 case AVMEDIA_TYPE_VIDEO:
257 /* FIXME: we have to have more sensible approach than this one */
258
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 930 if (c->has_video) {
259 ✗ av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
260 ✗ return AVERROR(EINVAL);
261 }
262
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 930 if (data_size != c->sys->frame_size) {
263 ✗ av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
264 ✗ data_size, c->sys->frame_size);
265 ✗ return AVERROR(ENOSYS);
266 }
267
268 930 memcpy(*frame, data, c->sys->frame_size);
269 930 c->has_video = 1;
270 930 break;
271 34 case AVMEDIA_TYPE_AUDIO:
272
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 34 for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
273
274 /* FIXME: we have to have more sensible approach than this one */
275
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 34 if (av_fifo_can_write(c->audio_data[i]) < data_size) {
276 ✗ av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
277 ✗ return AVERROR(EINVAL);
278 }
279 34 av_fifo_write(c->audio_data[i], data, data_size);
280
281 34 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
282
283 /* Let us see if we've got enough audio for one DV frame. */
284 34 c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i);
285
286 34 break;
287 ✗ default:
288 ✗ break;
289 }
290
291 /* Let us see if we have enough data to construct one DV frame. */
292
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 964 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
293 929 dv_inject_metadata(c, *frame);
294 929 c->has_audio = 0;
295
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 1008 for (i=0; i < c->n_ast; i++) {
296 79 dv_inject_audio(c, i, *frame);
297 79 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
298 79 av_fifo_drain2(c->audio_data[i], reqasize);
299 79 c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i);
300 }
301
302 929 c->has_video = 0;
303
304 929 c->frames++;
305
306 929 return c->sys->frame_size;
307 }
308
309 35 return 0;
310 }
311
312 20 static int dv_init_mux(AVFormatContext* s)
313 {
314 20 DVMuxContext *c = s->priv_data;
315 20 AVStream *vst = NULL;
316 int i;
317
318
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 20 if (s->nb_streams > 5) {
319 ✗ av_log(s, AV_LOG_ERROR,
320 "Invalid number of streams %d, the muxer supports at most 1 video channel and 4 audio channels.\n",
321 s->nb_streams);
322 ✗ return AVERROR_INVALIDDATA;
323 }
324
325 /* We have to sort out where audio and where video stream is */
326
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 43 for (i=0; i<s->nb_streams; i++) {
327 23 AVStream *st = s->streams[i];
328
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 23 switch (st->codecpar->codec_type) {
329 20 case AVMEDIA_TYPE_VIDEO:
330
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 20 if (vst) {
331 ✗ av_log(s, AV_LOG_ERROR,
332 "More than one video stream found, only one is accepted.\n");
333 ✗ return AVERROR_INVALIDDATA;
334 }
335
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 20 if (st->codecpar->codec_id != AV_CODEC_ID_DVVIDEO) {
336 ✗ av_log(s, AV_LOG_ERROR,
337 "Invalid codec for video stream, only DVVIDEO is supported.\n");
338 ✗ return AVERROR_INVALIDDATA;
339 }
340 20 vst = st;
341 20 break;
342 3 case AVMEDIA_TYPE_AUDIO:
343
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 3 if (c->n_ast > 1) {
344 ✗ av_log(s, AV_LOG_ERROR,
345 "More than two audio streams found, at most 2 are accepted.\n");
346 ✗ return AVERROR_INVALIDDATA;
347 }
348 /* Some checks -- DV format is very picky about its incoming streams */
349
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 3 if (st->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE) {
350 ✗ av_log(s, AV_LOG_ERROR,
351 "Invalid codec for stream %d, only PCM_S16LE is supported\n.", i);
352 ✗ return AVERROR_INVALIDDATA;
353 }
354
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 3 if (st->codecpar->ch_layout.nb_channels != 2) {
355 ✗ av_log(s, AV_LOG_ERROR,
356 "Invalid number of audio channels %d for stream %d, only 2 channels are supported\n.",
357 ✗ st->codecpar->ch_layout.nb_channels, i);
358 ✗ return AVERROR_INVALIDDATA;
359 }
360
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 3 if (st->codecpar->sample_rate != 48000 &&
361 ✗ st->codecpar->sample_rate != 44100 &&
362 ✗ st->codecpar->sample_rate != 32000) {
363 ✗ av_log(s, AV_LOG_ERROR,
364 "Invalid audio sample rate %d for stream %d, only 32000, 44100, and 48000 are supported.\n",
365 ✗ st->codecpar->sample_rate, i);
366 ✗ return AVERROR_INVALIDDATA;
367 }
368 3 c->ast[c->n_ast++] = st;
369 3 break;
370 ✗ default:
371 ✗ av_log(s, AV_LOG_ERROR,
372 "Invalid media type for stream %d, only audio and video are supported.\n", i);
373 ✗ return AVERROR_INVALIDDATA;
374 }
375 }
376
377
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 20 if (!vst) {
378 ✗ av_log(s, AV_LOG_ERROR,
379 "Missing video stream, must be present\n");
380 ✗ return AVERROR_INVALIDDATA;
381 }
382
383 40 c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height,
384 20 vst->codecpar->format, vst->time_base);
385
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 20 if (!c->sys) {
386 ✗ av_log(s, AV_LOG_ERROR,
387 "Could not find a valid video profile for size:%dx%d format:%s tb:%d%d\n",
388 ✗ vst->codecpar->width, vst->codecpar->height,
389 ✗ av_get_pix_fmt_name(vst->codecpar->format),
390 vst->time_base.num, vst->time_base.den);
391 ✗ return AVERROR_INVALIDDATA;
392 }
393
394
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 20 if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
395
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 3 for (i = 0; i < 2; i++) {
396
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 2 if (c->ast[i] && c->ast[i]->codecpar->sample_rate != 48000) {
397 ✗ av_log(s, AV_LOG_ERROR,
398 "Invalid sample rate %d for audio stream #%d for this video profile, must be 48000.\n",
399 ✗ c->ast[i]->codecpar->sample_rate, i);
400 ✗ return AVERROR_INVALIDDATA;
401 }
402 }
403 }
404
405
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 40 for (i = 1; i < 2; i++) {
406
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 20 if (((c->n_ast > i) && (c->sys->n_difchan < (2 * i)))) {
407 ✗ const char *mode = c->n_ast > 1 ? "50Mps" : "25Mps";
408 ✗ av_log(s, AV_LOG_ERROR,
409 "Invalid number of channels %d, only %d stereo pairs is allowed in %s mode.\n",
410 c->n_ast, i, mode);
411 ✗ return AVERROR_INVALIDDATA;
412 }
413 }
414
415 /* Ok, everything seems to be in working order */
416 20 c->frames = 0;
417 20 c->has_audio = 0;
418 20 c->has_video = 0;
419 20 ff_parse_creation_time_metadata(s, &c->start_time, 1);
420
421
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 23 for (i=0; i < c->n_ast; i++) {
422
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 3 if (!c->ast[i])
423 ✗ continue;
424 3 c->audio_data[i] = av_fifo_alloc2(100 * MAX_AUDIO_FRAME_SIZE, 1, 0);
425
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 3 if (!c->audio_data[i]) {
426 ✗ return AVERROR(ENOMEM);
427 }
428 }
429
430 20 return 0;
431 }
432
433 20 static int dv_write_header(AVFormatContext *s)
434 {
435 AVRational rate;
436 20 DVMuxContext *dvc = s->priv_data;
437 20 AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
438
439
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 20 if (dv_init_mux(s) < 0) {
440 ✗ av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
441 "Make sure that you supply at least two streams:\n"
442 " video: 25fps or 29.97fps, audio: 2ch/48|44.1|32kHz/PCM\n"
443 " (50Mbps allows an optional second audio stream)\n");
444 ✗ return AVERROR_INVALIDDATA;
445 }
446 20 rate.num = dvc->sys->ltc_divisor;
447 20 rate.den = 1;
448
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 20 if (!tcr) { // no global timecode, look into the streams
449 int i;
450
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 37 for (i = 0; i < s->nb_streams; i++) {
451 19 tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
452
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 19 if (tcr)
453 ✗ break;
454 }
455 }
456
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 20 if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
457 2 return 0;
458 18 return av_timecode_init(&dvc->tc, rate, 0, 0, s);
459 }
460
461 964 static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
462 {
463 uint8_t* frame;
464 int fsize;
465
466 964 fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
467 964 pkt->data, pkt->size, &frame);
468
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 964 if (fsize < 0) {
469 ✗ return fsize;
470 }
471 964 avio_write(s->pb, frame, fsize);
472 964 return 0;
473 }
474
475 /*
476 * We might end up with some extra A/V data without matching counterpart.
477 * E.g. video data without enough audio to write the complete frame.
478 * Currently we simply drop the last frame. I don't know whether this
479 * is the best strategy of all
480 */
481 20 static void dv_deinit(AVFormatContext *s)
482 {
483 20 DVMuxContext *c = s->priv_data;
484
485
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 23 for (int i = 0; i < c->n_ast; i++)
486 3 av_fifo_freep2(&c->audio_data[i]);
487 20 }
488
489 const FFOutputFormat ff_dv_muxer = {
490 .p.name = "dv",
491 .p.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
492 .p.extensions = "dv",
493 .priv_data_size = sizeof(DVMuxContext),
494 .p.audio_codec = AV_CODEC_ID_PCM_S16LE,
495 .p.video_codec = AV_CODEC_ID_DVVIDEO,
496 .write_header = dv_write_header,
497 .write_packet = dv_write_packet,
498 .deinit = dv_deinit,
499 };
500