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/dv.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"
44 #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
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
[2]; /* stereo audio streams */
51 AVFifoBuffer
*audio_data
[2]; /* 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 */
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 },
75 static int dv_audio_frame_size(const AVDVProfile
* sys
, int frame
, int sample_rate
)
77 if ((sys
->time_base
.den
== 25 || sys
->time_base
.den
== 50) && sys
->time_base
.num
== 1) {
78 if (sample_rate
== 32000) return 1280;
79 else if (sample_rate
== 44100) return 1764;
83 av_assert0(sample_rate
== 48000);
85 return sys
->audio_samples_dist
[frame
% (sizeof(sys
->audio_samples_dist
) /
86 sizeof(sys
->audio_samples_dist
[0]))];
89 static int dv_write_pack(enum dv_pack_type pack_id
, DVMuxContext
*c
, uint8_t* buf
, ...)
98 buf
[0] = (uint8_t)pack_id
;
101 timecode
= av_timecode_get_smpte_from_framenum(&c
->tc
, c
->frames
);
102 timecode
|= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
103 AV_WB32(buf
+ 1, timecode
);
105 case dv_audio_source
: /* AAUX source pack */
107 channel
= va_arg(ap
, int);
108 if (c
->ast
[channel
]->codec
->sample_rate
== 44100) {
110 } else if (c
->ast
[channel
]->codec
->sample_rate
== 32000)
112 buf
[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
113 (1 << 6) | /* reserved -- always 1 */
114 (dv_audio_frame_size(c
->sys
, c
->frames
, c
->ast
[channel
]->codec
->sample_rate
) -
115 c
->sys
->audio_min_samples
[audio_type
]);
117 buf
[2] = (0 << 7) | /* multi-stereo */
118 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
119 (0 << 4) | /* pair bit: 0 -- one pair of channels */
120 !!va_arg(ap
, int); /* audio mode */
121 buf
[3] = (1 << 7) | /* res */
122 (1 << 6) | /* multi-language flag */
123 (c
->sys
->dsf
<< 5) | /* system: 60fields/50fields */
124 (c
->sys
->n_difchan
& 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
125 buf
[4] = (1 << 7) | /* emphasis: 1 -- off */
126 (0 << 6) | /* emphasis time constant: 0 -- reserved */
127 (audio_type
<< 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
128 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
132 case dv_audio_control
:
133 buf
[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
134 (1 << 4) | /* input source: 1 -- digital input */
135 (3 << 2) | /* compression: 3 -- no information */
136 0; /* misc. info/SMPTE emphasis off */
137 buf
[2] = (1 << 7) | /* recording start point: 1 -- no */
138 (1 << 6) | /* recording end point: 1 -- no */
139 (1 << 3) | /* recording mode: 1 -- original */
141 buf
[3] = (1 << 7) | /* direction: 1 -- forward */
142 (c
->sys
->pix_fmt
== AV_PIX_FMT_YUV420P
? 0x20 : /* speed */
143 c
->sys
->ltc_divisor
* 4);
144 buf
[4] = (1 << 7) | /* reserved -- always 1 */
145 0x7f; /* genre category */
147 case dv_audio_recdate
:
148 case dv_video_recdate
: /* VAUX recording date */
149 ct
= c
->start_time
+ av_rescale_rnd(c
->frames
, c
->sys
->time_base
.num
,
150 c
->sys
->time_base
.den
, AV_ROUND_DOWN
);
151 ff_brktimegm(ct
, &tc
);
152 buf
[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
153 /* 0xff is very likely to be "unknown" */
154 buf
[2] = (3 << 6) | /* reserved -- always 1 */
155 ((tc
.tm_mday
/ 10) << 4) | /* Tens of day */
156 (tc
.tm_mday
% 10); /* Units of day */
157 buf
[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
158 ((tc
.tm_mon
/ 10) << 4) | /* Tens of month */
159 (tc
.tm_mon
% 10); /* Units of month */
160 buf
[4] = (((tc
.tm_year
% 100) / 10) << 4) | /* Tens of year */
161 (tc
.tm_year
% 10); /* Units of year */
163 case dv_audio_rectime
: /* AAUX recording time */
164 case dv_video_rectime
: /* VAUX recording time */
165 ct
= c
->start_time
+ av_rescale_rnd(c
->frames
, c
->sys
->time_base
.num
,
166 c
->sys
->time_base
.den
, AV_ROUND_DOWN
);
167 ff_brktimegm(ct
, &tc
);
168 buf
[1] = (3 << 6) | /* reserved -- always 1 */
169 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
170 buf
[2] = (1 << 7) | /* reserved -- always 1 */
171 ((tc
.tm_sec
/ 10) << 4) | /* Tens of seconds */
172 (tc
.tm_sec
% 10); /* Units of seconds */
173 buf
[3] = (1 << 7) | /* reserved -- always 1 */
174 ((tc
.tm_min
/ 10) << 4) | /* Tens of minutes */
175 (tc
.tm_min
% 10); /* Units of minutes */
176 buf
[4] = (3 << 6) | /* reserved -- always 1 */
177 ((tc
.tm_hour
/ 10) << 4) | /* Tens of hours */
178 (tc
.tm_hour
% 10); /* Units of hours */
181 buf
[1] = buf
[2] = buf
[3] = buf
[4] = 0xff;
186 static void dv_inject_audio(DVMuxContext
*c
, int channel
, uint8_t* frame_ptr
)
188 int i
, j
, d
, of
, size
;
189 size
= 4 * dv_audio_frame_size(c
->sys
, c
->frames
, c
->ast
[channel
]->codec
->sample_rate
);
190 frame_ptr
+= channel
* c
->sys
->difseg_size
* 150 * 80;
191 for (i
= 0; i
< c
->sys
->difseg_size
; i
++) {
192 frame_ptr
+= 6 * 80; /* skip DIF segment header */
193 for (j
= 0; j
< 9; j
++) {
194 dv_write_pack(dv_aaux_packs_dist
[i
][j
], c
, &frame_ptr
[3], channel
, i
>= c
->sys
->difseg_size
/2);
195 for (d
= 8; d
< 80; d
+=2) {
196 of
= c
->sys
->audio_shuffle
[i
][j
] + (d
- 8)/2 * c
->sys
->audio_stride
;
200 frame_ptr
[d
] = *av_fifo_peek2(c
->audio_data
[channel
], of
*2+1); // FIXME: maybe we have to admit
201 frame_ptr
[d
+1] = *av_fifo_peek2(c
->audio_data
[channel
], of
*2); // that DV is a big-endian PCM
203 frame_ptr
+= 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
208 static void dv_inject_metadata(DVMuxContext
*c
, uint8_t* frame
)
213 for (buf
= frame
; buf
< frame
+ c
->sys
->frame_size
; buf
+= 150 * 80) {
214 /* DV subcode: 2nd and 3d DIFs */
215 for (j
= 80; j
< 80 * 3; j
+= 80) {
216 for (k
= 6; k
< 6 * 8; k
+= 8)
217 dv_write_pack(dv_timecode
, c
, &buf
[j
+k
]);
219 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 ? */
220 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+14]);
221 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+22]);
222 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+38]);
223 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+46]);
227 /* DV VAUX: 4th, 5th and 6th 3DIFs */
228 for (j
= 80*3 + 3; j
< 80*6; j
+= 80) {
229 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+5*2]);
230 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+5*3]);
231 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+5*11]);
232 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+5*12]);
238 * The following 3 functions constitute our interface to the world
241 static int dv_assemble_frame(DVMuxContext
*c
, AVStream
* st
,
242 uint8_t* data
, int data_size
, uint8_t** frame
)
246 *frame
= &c
->frame_buf
[0];
248 switch (st
->codec
->codec_type
) {
249 case AVMEDIA_TYPE_VIDEO
:
250 /* FIXME: we have to have more sensible approach than this one */
252 av_log(st
->codec
, AV_LOG_ERROR
, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c
->frames
);
254 memcpy(*frame
, data
, c
->sys
->frame_size
);
257 case AVMEDIA_TYPE_AUDIO
:
258 for (i
= 0; i
< c
->n_ast
&& st
!= c
->ast
[i
]; i
++);
260 /* FIXME: we have to have more sensible approach than this one */
261 if (av_fifo_size(c
->audio_data
[i
]) + data_size
>= 100*MAX_AUDIO_FRAME_SIZE
)
262 av_log(st
->codec
, AV_LOG_ERROR
, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c
->frames
);
263 av_fifo_generic_write(c
->audio_data
[i
], data
, data_size
, NULL
);
265 reqasize
= 4 * dv_audio_frame_size(c
->sys
, c
->frames
, st
->codec
->sample_rate
);
267 /* Let us see if we've got enough audio for one DV frame. */
268 c
->has_audio
|= ((reqasize
<= av_fifo_size(c
->audio_data
[i
])) << i
);
275 /* Let us see if we have enough data to construct one DV frame. */
276 if (c
->has_video
== 1 && c
->has_audio
+ 1 == 1 << c
->n_ast
) {
277 dv_inject_metadata(c
, *frame
);
279 for (i
=0; i
< c
->n_ast
; i
++) {
280 dv_inject_audio(c
, i
, *frame
);
281 reqasize
= 4 * dv_audio_frame_size(c
->sys
, c
->frames
, c
->ast
[i
]->codec
->sample_rate
);
282 av_fifo_drain(c
->audio_data
[i
], reqasize
);
283 c
->has_audio
|= ((reqasize
<= av_fifo_size(c
->audio_data
[i
])) << i
);
290 return c
->sys
->frame_size
;
296 static DVMuxContext
* dv_init_mux(AVFormatContext
* s
)
298 DVMuxContext
*c
= s
->priv_data
;
299 AVStream
*vst
= NULL
;
300 AVDictionaryEntry
*t
;
303 /* we support at most 1 video and 2 audio streams */
304 if (s
->nb_streams
> 3)
308 c
->ast
[0] = c
->ast
[1] = NULL
;
310 /* We have to sort out where audio and where video stream is */
311 for (i
=0; i
<s
->nb_streams
; i
++) {
312 switch (s
->streams
[i
]->codec
->codec_type
) {
313 case AVMEDIA_TYPE_VIDEO
:
314 if (vst
) return NULL
;
317 case AVMEDIA_TYPE_AUDIO
:
318 if (c
->n_ast
> 1) return NULL
;
319 c
->ast
[c
->n_ast
++] = s
->streams
[i
];
326 /* Some checks -- DV format is very picky about its incoming streams */
327 if (!vst
|| vst
->codec
->codec_id
!= AV_CODEC_ID_DVVIDEO
)
329 for (i
=0; i
<c
->n_ast
; i
++) {
331 if(c
->ast
[i
]->codec
->codec_id
!= AV_CODEC_ID_PCM_S16LE
||
332 c
->ast
[i
]->codec
->channels
!= 2)
334 if (c
->ast
[i
]->codec
->sample_rate
!= 48000 &&
335 c
->ast
[i
]->codec
->sample_rate
!= 44100 &&
336 c
->ast
[i
]->codec
->sample_rate
!= 32000 )
340 c
->sys
= av_dv_codec_profile(vst
->codec
->width
, vst
->codec
->height
, vst
->codec
->pix_fmt
);
344 if ((c
->sys
->time_base
.den
!= 25 && c
->sys
->time_base
.den
!= 50) || c
->sys
->time_base
.num
!= 1) {
345 if (c
->ast
[0] && c
->ast
[0]->codec
->sample_rate
!= 48000)
347 if (c
->ast
[1] && c
->ast
[1]->codec
->sample_rate
!= 48000)
351 if ((c
->n_ast
> 1) && (c
->sys
->n_difchan
< 2)) {
352 /* only 1 stereo pair is allowed in 25Mbps mode */
356 /* Ok, everything seems to be in working order */
360 if (t
= av_dict_get(s
->metadata
, "creation_time", NULL
, 0))
361 c
->start_time
= ff_iso8601_to_unix_time(t
->value
);
363 for (i
=0; i
< c
->n_ast
; i
++) {
364 if (c
->ast
[i
] && !(c
->audio_data
[i
]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE
))) {
367 av_fifo_freep(&c
->audio_data
[i
]);
379 static void dv_delete_mux(DVMuxContext
*c
)
382 for (i
=0; i
< c
->n_ast
; i
++)
383 av_fifo_freep(&c
->audio_data
[i
]);
386 static int dv_write_header(AVFormatContext
*s
)
389 DVMuxContext
*dvc
= s
->priv_data
;
390 AVDictionaryEntry
*tcr
= av_dict_get(s
->metadata
, "timecode", NULL
, 0);
392 if (!dv_init_mux(s
)) {
393 av_log(s
, AV_LOG_ERROR
, "Can't initialize DV format!\n"
394 "Make sure that you supply exactly two streams:\n"
395 " video: 25fps or 29.97fps, audio: 2ch/48|44|32kHz/PCM\n"
396 " (50Mbps allows an optional second audio stream)\n");
399 rate
.num
= dvc
->sys
->ltc_divisor
;
401 if (!tcr
) { // no global timecode, look into the streams
403 for (i
= 0; i
< s
->nb_streams
; i
++) {
404 tcr
= av_dict_get(s
->streams
[i
]->metadata
, "timecode", NULL
, 0);
409 if (tcr
&& av_timecode_init_from_string(&dvc
->tc
, rate
, tcr
->value
, s
) >= 0)
411 return av_timecode_init(&dvc
->tc
, rate
, 0, 0, s
);
414 static int dv_write_packet(struct AVFormatContext
*s
, AVPacket
*pkt
)
419 fsize
= dv_assemble_frame(s
->priv_data
, s
->streams
[pkt
->stream_index
],
420 pkt
->data
, pkt
->size
, &frame
);
422 avio_write(s
->pb
, frame
, fsize
);
428 * We might end up with some extra A/V data without matching counterpart.
429 * E.g. video data without enough audio to write the complete frame.
430 * Currently we simply drop the last frame. I don't know whether this
431 * is the best strategy of all
433 static int dv_write_trailer(struct AVFormatContext
*s
)
435 dv_delete_mux(s
->priv_data
);
439 AVOutputFormat ff_dv_muxer
= {
441 .long_name
= NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
443 .priv_data_size
= sizeof(DVMuxContext
),
444 .audio_codec
= AV_CODEC_ID_PCM_S16LE
,
445 .video_codec
= AV_CODEC_ID_DVVIDEO
,
446 .write_header
= dv_write_header
,
447 .write_packet
= dv_write_packet
,
448 .write_trailer
= dv_write_trailer
,