2 * General DV muxer/demuxer
3 * Copyright (c) 2003 Roman Shaposhnik
5 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6 * of DV technical info.
9 * Copyright (c) 2002 Fabrice Bellard
11 * 50 Mbps (DVCPRO50) support
12 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
14 * This file is part of FFmpeg.
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.
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.
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
35 #include "libavcodec/dv_profile.h"
36 #include "libavcodec/dvdata.h"
38 #include "libavutil/fifo.h"
39 #include "libavutil/mathematics.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/opt.h"
42 #include "libavutil/timecode.h"
46 const DVprofile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
47 int n_ast; /* number of stereo audio streams (up to 2) */
48 AVStream *ast[2]; /* stereo audio streams */
49 AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */
50 int frames; /* current frame number */
51 int64_t start_time; /* recording start time */
52 int has_audio; /* frame under contruction has audio */
53 int has_video; /* frame under contruction has video */
54 uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */
55 char *tc_opt_str; /* timecode option string */
56 AVTimecode tc; /* timecode context */
59 static const int dv_aaux_packs_dist[12][9] = {
60 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
61 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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 },
74 static int dv_audio_frame_size(const DVprofile* sys, int frame)
76 return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
77 sizeof(sys->audio_samples_dist[0]))];
80 static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
87 buf[0] = (uint8_t)pack_id;
90 timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
91 timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
92 AV_WB32(buf + 1, timecode);
94 case dv_audio_source: /* AAUX source pack */
96 buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
97 (1 << 6) | /* reserved -- always 1 */
98 (dv_audio_frame_size(c->sys, c->frames) -
99 c->sys->audio_min_samples[0]);
101 buf[2] = (0 << 7) | /* multi-stereo */
102 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
103 (0 << 4) | /* pair bit: 0 -- one pair of channels */
104 !!va_arg(ap, int); /* audio mode */
105 buf[3] = (1 << 7) | /* res */
106 (1 << 6) | /* multi-language flag */
107 (c->sys->dsf << 5) | /* system: 60fields/50fields */
108 (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
109 buf[4] = (1 << 7) | /* emphasis: 1 -- off */
110 (0 << 6) | /* emphasis time constant: 0 -- reserved */
111 (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
112 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
115 case dv_audio_control:
116 buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
117 (1 << 4) | /* input source: 1 -- digital input */
118 (3 << 2) | /* compression: 3 -- no information */
119 0; /* misc. info/SMPTE emphasis off */
120 buf[2] = (1 << 7) | /* recording start point: 1 -- no */
121 (1 << 6) | /* recording end point: 1 -- no */
122 (1 << 3) | /* recording mode: 1 -- original */
124 buf[3] = (1 << 7) | /* direction: 1 -- forward */
125 (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */
126 c->sys->ltc_divisor * 4);
127 buf[4] = (1 << 7) | /* reserved -- always 1 */
128 0x7f; /* genre category */
130 case dv_audio_recdate:
131 case dv_video_recdate: /* VAUX recording date */
132 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
133 c->sys->time_base.den, AV_ROUND_DOWN);
134 ff_brktimegm(ct, &tc);
135 buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
136 /* 0xff is very likely to be "unknown" */
137 buf[2] = (3 << 6) | /* reserved -- always 1 */
138 ((tc.tm_mday / 10) << 4) | /* Tens of day */
139 (tc.tm_mday % 10); /* Units of day */
140 buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
141 ((tc.tm_mon / 10) << 4) | /* Tens of month */
142 (tc.tm_mon % 10); /* Units of month */
143 buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
144 (tc.tm_year % 10); /* Units of year */
146 case dv_audio_rectime: /* AAUX recording time */
147 case dv_video_rectime: /* VAUX recording time */
148 ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num,
149 c->sys->time_base.den, AV_ROUND_DOWN);
150 ff_brktimegm(ct, &tc);
151 buf[1] = (3 << 6) | /* reserved -- always 1 */
152 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
153 buf[2] = (1 << 7) | /* reserved -- always 1 */
154 ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
155 (tc.tm_sec % 10); /* Units of seconds */
156 buf[3] = (1 << 7) | /* reserved -- always 1 */
157 ((tc.tm_min / 10) << 4) | /* Tens of minutes */
158 (tc.tm_min % 10); /* Units of minutes */
159 buf[4] = (3 << 6) | /* reserved -- always 1 */
160 ((tc.tm_hour / 10) << 4) | /* Tens of hours */
161 (tc.tm_hour % 10); /* Units of hours */
164 buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
169 static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
171 int i, j, d, of, size;
172 size = 4 * dv_audio_frame_size(c->sys, c->frames);
173 frame_ptr += channel * c->sys->difseg_size * 150 * 80;
174 for (i = 0; i < c->sys->difseg_size; i++) {
175 frame_ptr += 6 * 80; /* skip DIF segment header */
176 for (j = 0; j < 9; j++) {
177 dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2);
178 for (d = 8; d < 80; d+=2) {
179 of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
183 frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
184 frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM
186 frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
191 static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
196 for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
197 /* DV subcode: 2nd and 3d DIFs */
198 for (j = 80; j < 80 * 3; j += 80) {
199 for (k = 6; k < 6 * 8; k += 8)
200 dv_write_pack(dv_timecode, c, &buf[j+k]);
202 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 ? */
203 dv_write_pack(dv_video_recdate, c, &buf[j+14]);
204 dv_write_pack(dv_video_rectime, c, &buf[j+22]);
205 dv_write_pack(dv_video_recdate, c, &buf[j+38]);
206 dv_write_pack(dv_video_rectime, c, &buf[j+46]);
210 /* DV VAUX: 4th, 5th and 6th 3DIFs */
211 for (j = 80*3 + 3; j < 80*6; j += 80) {
212 dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
213 dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
214 dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
215 dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
221 * The following 3 functions constitute our interface to the world
224 static int dv_assemble_frame(DVMuxContext *c, AVStream* st,
225 uint8_t* data, int data_size, uint8_t** frame)
229 *frame = &c->frame_buf[0];
230 reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
232 switch (st->codec->codec_type) {
233 case AVMEDIA_TYPE_VIDEO:
234 /* FIXME: we have to have more sensible approach than this one */
236 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
238 memcpy(*frame, data, c->sys->frame_size);
241 case AVMEDIA_TYPE_AUDIO:
242 for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
244 /* FIXME: we have to have more sensible approach than this one */
245 if (av_fifo_size(c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
246 av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
247 av_fifo_generic_write(c->audio_data[i], data, data_size, NULL);
249 /* Let us see if we've got enough audio for one DV frame. */
250 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
257 /* Let us see if we have enough data to construct one DV frame. */
258 if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) {
259 dv_inject_metadata(c, *frame);
261 for (i=0; i < c->n_ast; i++) {
262 dv_inject_audio(c, i, *frame);
263 av_fifo_drain(c->audio_data[i], reqasize);
264 c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i);
271 return c->sys->frame_size;
277 static DVMuxContext* dv_init_mux(AVFormatContext* s)
279 DVMuxContext *c = s->priv_data;
280 AVStream *vst = NULL;
281 AVDictionaryEntry *t;
284 /* we support at most 1 video and 2 audio streams */
285 if (s->nb_streams > 3)
289 c->ast[0] = c->ast[1] = NULL;
291 /* We have to sort out where audio and where video stream is */
292 for (i=0; i<s->nb_streams; i++) {
293 switch (s->streams[i]->codec->codec_type) {
294 case AVMEDIA_TYPE_VIDEO:
295 if (vst) return NULL;
298 case AVMEDIA_TYPE_AUDIO:
299 if (c->n_ast > 1) return NULL;
300 c->ast[c->n_ast++] = s->streams[i];
307 /* Some checks -- DV format is very picky about its incoming streams */
308 if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
310 for (i=0; i<c->n_ast; i++) {
311 if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE ||
312 c->ast[i]->codec->sample_rate != 48000 ||
313 c->ast[i]->codec->channels != 2))
316 c->sys = avpriv_dv_codec_profile(vst->codec);
320 if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
321 /* only 1 stereo pair is allowed in 25Mbps mode */
325 /* Ok, everything seems to be in working order */
329 if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
330 c->start_time = ff_iso8601_to_unix_time(t->value);
332 for (i=0; i < c->n_ast; i++) {
333 if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*AVCODEC_MAX_AUDIO_FRAME_SIZE))) {
336 av_fifo_free(c->audio_data[i]);
348 static void dv_delete_mux(DVMuxContext *c)
351 for (i=0; i < c->n_ast; i++)
352 av_fifo_free(c->audio_data[i]);
355 static int dv_write_header(AVFormatContext *s)
358 DVMuxContext *dvc = s->priv_data;
360 if (!dv_init_mux(s)) {
361 av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
362 "Make sure that you supply exactly two streams:\n"
363 " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n"
364 " (50Mbps allows an optional second audio stream)\n");
367 rate.num = dvc->sys->ltc_divisor;
370 return av_timecode_init_from_string(&dvc->tc, rate,
372 return av_timecode_init(&dvc->tc, rate, 0, 0, s);
375 static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
380 fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index],
381 pkt->data, pkt->size, &frame);
383 avio_write(s->pb, frame, fsize);
390 * We might end up with some extra A/V data without matching counterpart.
391 * E.g. video data without enough audio to write the complete frame.
392 * Currently we simply drop the last frame. I don't know whether this
393 * is the best strategy of all
395 static int dv_write_trailer(struct AVFormatContext *s)
397 dv_delete_mux(s->priv_data);
401 static const AVClass class = {
403 .item_name = av_default_item_name,
404 .version = LIBAVUTIL_VERSION_INT,
405 .option = (const AVOption[]){
406 {AV_TIMECODE_OPTION(DVMuxContext, tc_opt_str, AV_OPT_FLAG_ENCODING_PARAM)},
411 AVOutputFormat ff_dv_muxer = {
413 .long_name = NULL_IF_CONFIG_SMALL("DV video format"),
415 .priv_data_size = sizeof(DVMuxContext),
416 .audio_codec = CODEC_ID_PCM_S16LE,
417 .video_codec = CODEC_ID_DVVIDEO,
418 .write_header = dv_write_header,
419 .write_packet = dv_write_packet,
420 .write_trailer = dv_write_trailer,
421 .priv_class = &class,