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
33 #include "libavcodec/dvdata.h"
35 #include "libavutil/fifo.h"
38 const DVprofile
* sys
; /* Current DV profile. E.g.: 525/60, 625/50 */
39 int n_ast
; /* Number of stereo audio streams (up to 2) */
40 AVStream
*ast
[2]; /* Stereo audio streams */
41 AVFifoBuffer audio_data
[2]; /* Fifo for storing excessive amounts of PCM */
42 int frames
; /* Number of a current frame */
43 time_t start_time
; /* Start time of recording */
44 int has_audio
; /* frame under contruction has audio */
45 int has_video
; /* frame under contruction has video */
46 uint8_t frame_buf
[DV_MAX_FRAME_SIZE
]; /* frame under contruction */
49 static const int dv_aaux_packs_dist
[12][9] = {
50 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
51 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
52 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
53 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
54 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
55 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
56 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
57 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
58 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
59 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
60 { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
61 { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
64 static int dv_audio_frame_size(const DVprofile
* sys
, int frame
)
66 return sys
->audio_samples_dist
[frame
% (sizeof(sys
->audio_samples_dist
)/
67 sizeof(sys
->audio_samples_dist
[0]))];
70 static int dv_write_pack(enum dv_pack_type pack_id
, DVMuxContext
*c
, uint8_t* buf
, ...)
77 buf
[0] = (uint8_t)pack_id
;
80 ct
= (time_t)(c
->frames
/ ((float)c
->sys
->frame_rate
/
81 (float)c
->sys
->frame_rate_base
));
84 * LTC drop-frame frame counter drops two frames (0 and 1) every
85 * minute, unless it is exactly divisible by 10
87 ltc_frame
= (c
->frames
+ 2*ct
/60 - 2*ct
/600) % c
->sys
->ltc_divisor
;
88 buf
[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
89 (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
90 ((ltc_frame
/ 10) << 4) | /* Tens of frames */
91 (ltc_frame
% 10); /* Units of frames */
92 buf
[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
93 ((tc
.tm_sec
/ 10) << 4) | /* Tens of seconds */
94 (tc
.tm_sec
% 10); /* Units of seconds */
95 buf
[3] = (1 << 7) | /* Binary group flag BGF0 */
96 ((tc
.tm_min
/ 10) << 4) | /* Tens of minutes */
97 (tc
.tm_min
% 10); /* Units of minutes */
98 buf
[4] = (1 << 7) | /* Binary group flag BGF2 */
99 (1 << 6) | /* Binary group flag BGF1 */
100 ((tc
.tm_hour
/ 10) << 4) | /* Tens of hours */
101 (tc
.tm_hour
% 10); /* Units of hours */
103 case dv_audio_source
: /* AAUX source pack */
105 buf
[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
106 (1 << 6) | /* reserved -- always 1 */
107 (dv_audio_frame_size(c
->sys
, c
->frames
) -
108 c
->sys
->audio_min_samples
[0]);
110 buf
[2] = (0 << 7) | /* multi-stereo */
111 (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
112 (0 << 4) | /* pair bit: 0 -- one pair of channels */
113 !!va_arg(ap
, int); /* audio mode */
114 buf
[3] = (1 << 7) | /* res */
115 (1 << 6) | /* multi-language flag */
116 (c
->sys
->dsf
<< 5) | /* system: 60fields/50fields */
117 (c
->sys
->n_difchan
& 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
118 buf
[4] = (1 << 7) | /* emphasis: 1 -- off */
119 (0 << 6) | /* emphasis time constant: 0 -- reserved */
120 (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
121 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
124 case dv_audio_control
:
125 buf
[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
126 (1 << 4) | /* input source: 1 -- digital input */
127 (3 << 2) | /* compression: 3 -- no information */
128 0; /* misc. info/SMPTE emphasis off */
129 buf
[2] = (1 << 7) | /* recording start point: 1 -- no */
130 (1 << 6) | /* recording end point: 1 -- no */
131 (1 << 3) | /* recording mode: 1 -- original */
133 buf
[3] = (1 << 7) | /* direction: 1 -- forward */
134 (c
->sys
->pix_fmt
== PIX_FMT_YUV420P
? 0x20 : /* speed */
135 c
->sys
->ltc_divisor
*4);
136 buf
[4] = (1 << 7) | /* reserved -- always 1 */
137 0x7f; /* genre category */
139 case dv_audio_recdate
:
140 case dv_video_recdate
: /* VAUX recording date */
141 ct
= c
->start_time
+ (time_t)(c
->frames
/
142 ((float)c
->sys
->frame_rate
/ (float)c
->sys
->frame_rate_base
));
144 buf
[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
145 /* 0xff is very likely to be "unknown" */
146 buf
[2] = (3 << 6) | /* reserved -- always 1 */
147 ((tc
.tm_mday
/ 10) << 4) | /* Tens of day */
148 (tc
.tm_mday
% 10); /* Units of day */
149 buf
[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
150 ((tc
.tm_mon
/ 10) << 4) | /* Tens of month */
151 (tc
.tm_mon
% 10); /* Units of month */
152 buf
[4] = (((tc
.tm_year
% 100) / 10) << 4) | /* Tens of year */
153 (tc
.tm_year
% 10); /* Units of year */
155 case dv_audio_rectime
: /* AAUX recording time */
156 case dv_video_rectime
: /* VAUX recording time */
157 ct
= c
->start_time
+ (time_t)(c
->frames
/
158 ((float)c
->sys
->frame_rate
/ (float)c
->sys
->frame_rate_base
));
160 buf
[1] = (3 << 6) | /* reserved -- always 1 */
161 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
162 buf
[2] = (1 << 7) | /* reserved -- always 1 */
163 ((tc
.tm_sec
/ 10) << 4) | /* Tens of seconds */
164 (tc
.tm_sec
% 10); /* Units of seconds */
165 buf
[3] = (1 << 7) | /* reserved -- always 1 */
166 ((tc
.tm_min
/ 10) << 4) | /* Tens of minutes */
167 (tc
.tm_min
% 10); /* Units of minutes */
168 buf
[4] = (3 << 6) | /* reserved -- always 1 */
169 ((tc
.tm_hour
/ 10) << 4) | /* Tens of hours */
170 (tc
.tm_hour
% 10); /* Units of hours */
173 buf
[1] = buf
[2] = buf
[3] = buf
[4] = 0xff;
178 static void dv_inject_audio(DVMuxContext
*c
, int channel
, uint8_t* frame_ptr
)
180 int i
, j
, d
, of
, size
;
181 size
= 4 * dv_audio_frame_size(c
->sys
, c
->frames
);
182 frame_ptr
+= channel
* c
->sys
->difseg_size
* 150 * 80;
183 for (i
= 0; i
< c
->sys
->difseg_size
; i
++) {
184 frame_ptr
+= 6 * 80; /* skip DIF segment header */
185 for (j
= 0; j
< 9; j
++) {
186 dv_write_pack(dv_aaux_packs_dist
[i
][j
], c
, &frame_ptr
[3], i
>= c
->sys
->difseg_size
/2);
187 for (d
= 8; d
< 80; d
+=2) {
188 of
= c
->sys
->audio_shuffle
[i
][j
] + (d
- 8)/2 * c
->sys
->audio_stride
;
192 frame_ptr
[d
] = av_fifo_peek(&c
->audio_data
[channel
], of
*2+1); // FIXME: may be we have to admit
193 frame_ptr
[d
+1] = av_fifo_peek(&c
->audio_data
[channel
], of
*2); // that DV is a big endian PCM
195 frame_ptr
+= 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
200 static void dv_inject_metadata(DVMuxContext
*c
, uint8_t* frame
)
205 for (buf
= frame
; buf
< frame
+ c
->sys
->frame_size
; buf
+= 150 * 80) {
206 /* DV subcode: 2nd and 3d DIFs */
207 for (j
= 80; j
< 80 * 3; j
+= 80) {
208 for (k
= 6; k
< 6 * 8; k
+= 8)
209 dv_write_pack(dv_timecode
, c
, &buf
[j
+k
]);
211 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 ? */
212 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+14]);
213 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+22]);
214 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+38]);
215 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+46]);
219 /* DV VAUX: 4th, 5th and 6th 3DIFs */
220 for (j
= 80*3 + 3; j
< 80*6; j
+= 80) {
221 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+5*2]);
222 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+5*3]);
223 dv_write_pack(dv_video_recdate
, c
, &buf
[j
+5*11]);
224 dv_write_pack(dv_video_rectime
, c
, &buf
[j
+5*12]);
230 * The following 3 functions constitute our interface to the world
233 int dv_assemble_frame(DVMuxContext
*c
, AVStream
* st
,
234 const uint8_t* data
, int data_size
, uint8_t** frame
)
238 *frame
= &c
->frame_buf
[0];
239 reqasize
= 4 * dv_audio_frame_size(c
->sys
, c
->frames
);
241 switch (st
->codec
->codec_type
) {
242 case CODEC_TYPE_VIDEO
:
243 /* FIXME: we have to have more sensible approach than this one */
245 av_log(st
->codec
, AV_LOG_ERROR
, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c
->frames
);
247 memcpy(*frame
, data
, c
->sys
->frame_size
);
250 case CODEC_TYPE_AUDIO
:
251 for (i
= 0; i
< c
->n_ast
&& st
!= c
->ast
[i
]; i
++);
253 /* FIXME: we have to have more sensible approach than this one */
254 if (av_fifo_size(&c
->audio_data
[i
]) + data_size
>= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE
)
255 av_log(st
->codec
, AV_LOG_ERROR
, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c
->frames
);
256 av_fifo_generic_write(&c
->audio_data
[i
], data
, data_size
, NULL
);
258 /* Lets see if we've got enough audio for one DV frame */
259 c
->has_audio
|= ((reqasize
<= av_fifo_size(&c
->audio_data
[i
])) << i
);
266 /* Lets see if we have enough data to construct one DV frame */
267 if (c
->has_video
== 1 && c
->has_audio
+ 1 == 1<<c
->n_ast
) {
268 dv_inject_metadata(c
, *frame
);
270 for (i
=0; i
<c
->n_ast
; i
++) {
271 dv_inject_audio(c
, i
, *frame
);
272 av_fifo_drain(&c
->audio_data
[i
], reqasize
);
273 c
->has_audio
|= ((reqasize
<= av_fifo_size(&c
->audio_data
[i
])) << i
);
280 return c
->sys
->frame_size
;
286 DVMuxContext
* dv_init_mux(AVFormatContext
* s
)
288 DVMuxContext
*c
= s
->priv_data
;
289 AVStream
*vst
= NULL
;
292 /* we support at most 1 video and 2 audio streams */
293 if (s
->nb_streams
> 3)
297 c
->ast
[0] = c
->ast
[1] = NULL
;
299 /* We have to sort out where audio and where video stream is */
300 for (i
=0; i
<s
->nb_streams
; i
++) {
301 switch (s
->streams
[i
]->codec
->codec_type
) {
302 case CODEC_TYPE_VIDEO
:
303 if (vst
) return NULL
;
306 case CODEC_TYPE_AUDIO
:
307 if (c
->n_ast
> 1) return NULL
;
308 c
->ast
[c
->n_ast
++] = s
->streams
[i
];
315 /* Some checks -- DV format is very picky about its incoming streams */
316 if (!vst
|| vst
->codec
->codec_id
!= CODEC_ID_DVVIDEO
)
318 for (i
=0; i
<c
->n_ast
; i
++) {
319 if (c
->ast
[i
] && (c
->ast
[i
]->codec
->codec_id
!= CODEC_ID_PCM_S16LE
||
320 c
->ast
[i
]->codec
->sample_rate
!= 48000 ||
321 c
->ast
[i
]->codec
->channels
!= 2))
324 c
->sys
= dv_codec_profile(vst
->codec
);
328 if((c
->n_ast
> 1) && (c
->sys
->n_difchan
< 2)) {
329 /* only 1 stereo pair is allowed in 25Mbps mode */
333 /* Ok, everything seems to be in working order */
337 c
->start_time
= (time_t)s
->timestamp
;
339 for (i
=0; i
<c
->n_ast
; i
++) {
340 if (c
->ast
[i
] && av_fifo_init(&c
->audio_data
[i
], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE
) < 0) {
343 av_fifo_free(&c
->audio_data
[i
]);
355 void dv_delete_mux(DVMuxContext
*c
)
358 for (i
=0; i
< c
->n_ast
; i
++)
359 av_fifo_free(&c
->audio_data
[i
]);
363 static int dv_write_header(AVFormatContext
*s
)
365 if (!dv_init_mux(s
)) {
366 av_log(s
, AV_LOG_ERROR
, "Can't initialize DV format!\n"
367 "Make sure that you supply exactly two streams:\n"
368 " video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n"
369 " (50Mbps allows an optional second audio stream)\n");
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 put_buffer(s
->pb
, frame
, fsize
);
384 put_flush_packet(s
->pb
);
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
);
400 #endif /* CONFIG_MUXERS */
402 #ifdef CONFIG_DV_MUXER
403 AVOutputFormat dv_muxer
= {
405 NULL_IF_CONFIG_SMALL("DV video format"),
408 sizeof(DVMuxContext
),