979 lines
33 KiB
C
979 lines
33 KiB
C
/*
|
|
* General DV muxer/demuxer
|
|
* Copyright (c) 2003 Roman Shaposhnick
|
|
*
|
|
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
|
|
* of DV technical info.
|
|
*
|
|
* Raw DV format
|
|
* Copyright (c) 2002 Fabrice Bellard.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <time.h>
|
|
#include "avformat.h"
|
|
#include "dvdata.h"
|
|
#include "dv.h"
|
|
|
|
struct DVDemuxContext {
|
|
AVFormatContext* fctx;
|
|
AVStream* vst;
|
|
AVStream* ast[2];
|
|
AVPacket audio_pkt[2];
|
|
uint8_t audio_buf[2][8192];
|
|
int ach;
|
|
int frames;
|
|
uint64_t abytes;
|
|
};
|
|
|
|
struct DVMuxContext {
|
|
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
|
|
uint8_t frame_buf[144000]; /* frame under contruction */
|
|
FifoBuffer audio_data; /* Fifo for storing excessive amounts of PCM */
|
|
int frames; /* Number of a current frame */
|
|
time_t start_time; /* Start time of recording */
|
|
uint8_t aspect; /* Aspect ID 0 - 4:3, 7 - 16:9 */
|
|
int has_audio; /* frame under contruction has audio */
|
|
int has_video; /* frame under contruction has video */
|
|
};
|
|
|
|
enum dv_section_type {
|
|
dv_sect_header = 0x1f,
|
|
dv_sect_subcode = 0x3f,
|
|
dv_sect_vaux = 0x56,
|
|
dv_sect_audio = 0x76,
|
|
dv_sect_video = 0x96,
|
|
};
|
|
|
|
enum dv_pack_type {
|
|
dv_header525 = 0x3f, /* see dv_write_pack for important details on */
|
|
dv_header625 = 0xbf, /* these two packs */
|
|
dv_timecode = 0x13,
|
|
dv_audio_source = 0x50,
|
|
dv_audio_control = 0x51,
|
|
dv_audio_recdate = 0x52,
|
|
dv_audio_rectime = 0x53,
|
|
dv_video_source = 0x60,
|
|
dv_video_control = 0x61,
|
|
dv_viedo_recdate = 0x62,
|
|
dv_video_rectime = 0x63,
|
|
dv_unknown_pack = 0xff,
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
* The reason why the following three big ugly looking tables are
|
|
* here is my lack of DV spec IEC 61834. The tables were basically
|
|
* constructed to make code that places packs in SSYB, VAUX and
|
|
* AAUX blocks very simple and table-driven. They conform to the
|
|
* SMPTE 314M and the output of my personal DV camcorder, neither
|
|
* of which is sufficient for a reliable DV stream producing. Thus
|
|
* while code is still in development I'll be gathering input from
|
|
* people with different DV equipment and modifying the tables to
|
|
* accommodate all the quirks. Later on, if possible, some of them
|
|
* will be folded into smaller tables and/or switch-if logic. For
|
|
* now, my only excuse is -- they don't eat up that much of a space.
|
|
*/
|
|
|
|
static const int dv_ssyb_packs_dist[12][6] = {
|
|
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
|
|
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
|
|
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
|
|
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
|
|
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
|
|
{ 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
|
|
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
|
|
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
|
|
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
|
|
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
|
|
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
|
|
{ 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
|
|
};
|
|
|
|
static const int dv_vaux_packs_dist[12][15] = {
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
{ 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
|
|
};
|
|
|
|
static const int dv_aaux_packs_dist[12][9] = {
|
|
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
|
|
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
|
|
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
|
|
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
|
|
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
|
|
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
|
|
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
|
|
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
|
|
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
|
|
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
|
|
{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
|
|
{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
|
|
};
|
|
|
|
static inline uint16_t dv_audio_12to16(uint16_t sample)
|
|
{
|
|
uint16_t shift, result;
|
|
|
|
sample = (sample < 0x800) ? sample : sample | 0xf000;
|
|
shift = (sample & 0xf00) >> 8;
|
|
|
|
if (shift < 0x2 || shift > 0xd) {
|
|
result = sample;
|
|
} else if (shift < 0x8) {
|
|
shift--;
|
|
result = (sample - (256 * shift)) << shift;
|
|
} else {
|
|
shift = 0xe - shift;
|
|
result = ((sample + ((256 * shift) + 1)) << shift) - 1;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int dv_audio_frame_size(const DVprofile* sys, int frame)
|
|
{
|
|
return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
|
|
sizeof(sys->audio_samples_dist[0]))];
|
|
}
|
|
|
|
static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
|
|
{
|
|
struct tm tc;
|
|
time_t ct;
|
|
int ltc_frame;
|
|
|
|
buf[0] = (uint8_t)pack_id;
|
|
switch (pack_id) {
|
|
case dv_header525: /* I can't imagine why these two weren't defined as real */
|
|
case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
|
|
buf[1] = 0xf8 | /* reserved -- always 1 */
|
|
(0 & 0x07); /* APT: Track application ID */
|
|
buf[2] = (0 << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */
|
|
(0x0f << 3) | /* reserved -- always 1 */
|
|
(0 & 0x07); /* AP1: Audio application ID */
|
|
buf[3] = (0 << 7) | /* TF2: video data is 0 - valid; 1 - invalid */
|
|
(0x0f << 3) | /* reserved -- always 1 */
|
|
(0 & 0x07); /* AP2: Video application ID */
|
|
buf[4] = (0 << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
|
|
(0x0f << 3) | /* reserved -- always 1 */
|
|
(0 & 0x07); /* AP3: Subcode application ID */
|
|
break;
|
|
case dv_timecode:
|
|
ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
|
|
(float)c->sys->frame_rate_base));
|
|
brktimegm(ct, &tc);
|
|
/*
|
|
* LTC drop-frame frame counter drops two frames (0 and 1) every
|
|
* minute, unless it is exactly divisible by 10
|
|
*/
|
|
ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
|
|
buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
|
|
(1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
|
|
((ltc_frame / 10) << 4) | /* Tens of frames */
|
|
(ltc_frame % 10); /* Units of frames */
|
|
buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
|
|
((tc.tm_sec / 10) << 4) | /* Tens of seconds */
|
|
(tc.tm_sec % 10); /* Units of seconds */
|
|
buf[3] = (1 << 7) | /* Binary group flag BGF0 */
|
|
((tc.tm_min / 10) << 4) | /* Tens of minutes */
|
|
(tc.tm_min % 10); /* Units of minutes */
|
|
buf[4] = (1 << 7) | /* Binary group flag BGF2 */
|
|
(1 << 6) | /* Binary group flag BGF1 */
|
|
((tc.tm_hour / 10) << 4) | /* Tens of hours */
|
|
(tc.tm_hour % 10); /* Units of hours */
|
|
break;
|
|
case dv_audio_source: /* AAUX source pack */
|
|
buf[1] = (0 << 7) | /* locked mode */
|
|
(1 << 6) | /* reserved -- always 1 */
|
|
(dv_audio_frame_size(c->sys, c->frames) -
|
|
c->sys->audio_min_samples[0]);
|
|
/* # of samples */
|
|
buf[2] = (0 << 7) | /* multi-stereo */
|
|
(0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
|
|
(0 << 4) | /* pair bit: 0 -- one pair of channels */
|
|
0; /* audio mode */
|
|
buf[3] = (1 << 7) | /* res */
|
|
(1 << 6) | /* multi-language flag */
|
|
(c->sys->dsf << 5) | /* system: 60fields/50fields */
|
|
0; /* definition: 0 -- SD (525/625) */
|
|
buf[4] = (1 << 7) | /* emphasis: 1 -- off */
|
|
(0 << 6) | /* emphasis time constant: 0 -- reserved */
|
|
(0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
|
|
0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
|
|
break;
|
|
case dv_audio_control:
|
|
buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
|
|
(1 << 4) | /* input source: 1 -- digital input */
|
|
(3 << 2) | /* compression: 3 -- no information */
|
|
0; /* misc. info/SMPTE emphasis off */
|
|
buf[2] = (1 << 7) | /* recording start point: 1 -- no */
|
|
(1 << 6) | /* recording end point: 1 -- no */
|
|
(1 << 3) | /* recording mode: 1 -- original */
|
|
7;
|
|
buf[3] = (1 << 7) | /* direction: 1 -- forward */
|
|
0x20; /* speed */
|
|
buf[4] = (1 << 7) | /* reserved -- always 1 */
|
|
0x7f; /* genre category */
|
|
break;
|
|
case dv_audio_recdate:
|
|
case dv_viedo_recdate: /* VAUX recording date */
|
|
ct = c->start_time + (time_t)(c->frames /
|
|
((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
|
|
brktimegm(ct, &tc);
|
|
buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
|
|
/* 0xff is very likely to be "unknown" */
|
|
buf[2] = (3 << 6) | /* reserved -- always 1 */
|
|
((tc.tm_mday / 10) << 4) | /* Tens of day */
|
|
(tc.tm_mday % 10); /* Units of day */
|
|
buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
|
|
((tc.tm_mon / 10) << 4) | /* Tens of month */
|
|
(tc.tm_mon % 10); /* Units of month */
|
|
buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
|
|
(tc.tm_year % 10); /* Units of year */
|
|
break;
|
|
case dv_audio_rectime: /* AAUX recording time */
|
|
case dv_video_rectime: /* VAUX recording time */
|
|
ct = c->start_time + (time_t)(c->frames /
|
|
((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
|
|
brktimegm(ct, &tc);
|
|
buf[1] = (3 << 6) | /* reserved -- always 1 */
|
|
0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
|
|
buf[2] = (1 << 7) | /* reserved -- always 1 */
|
|
((tc.tm_sec / 10) << 4) | /* Tens of seconds */
|
|
(tc.tm_sec % 10); /* Units of seconds */
|
|
buf[3] = (1 << 7) | /* reserved -- always 1 */
|
|
((tc.tm_min / 10) << 4) | /* Tens of minutes */
|
|
(tc.tm_min % 10); /* Units of minutes */
|
|
buf[4] = (3 << 6) | /* reserved -- always 1 */
|
|
((tc.tm_hour / 10) << 4) | /* Tens of hours */
|
|
(tc.tm_hour % 10); /* Units of hours */
|
|
break;
|
|
case dv_video_source:
|
|
buf[1] = 0xff; /* reserved -- always 1 */
|
|
buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
|
|
(1 << 6) | /* following CLF is valid - 0, invalid - 1 */
|
|
(3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
|
|
0xf; /* reserved -- always 1 */
|
|
buf[3] = (3 << 6) | /* reserved -- always 1 */
|
|
(c->sys->dsf << 5) | /* system: 60fields/50fields */
|
|
0; /* signal type video compression */
|
|
buf[4] = 0xff; /* VISC: 0xff -- no information */
|
|
break;
|
|
case dv_video_control:
|
|
buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
|
|
0x3f; /* reserved -- always 1 */
|
|
buf[2] = 0xc8 | /* reserved -- always b11001xxx */
|
|
c->aspect;
|
|
buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
|
|
(1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
|
|
(1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
|
|
(1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
|
|
0xc; /* reserved -- always b1100 */
|
|
buf[4] = 0xff; /* reserved -- always 1 */
|
|
break;
|
|
default:
|
|
buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
|
|
}
|
|
return 5;
|
|
}
|
|
|
|
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num,
|
|
uint8_t dif_num, uint8_t* buf)
|
|
{
|
|
buf[0] = (uint8_t)t; /* Section type */
|
|
buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
|
|
(0 << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */
|
|
7; /* reserved -- always 1 */
|
|
buf[2] = dif_num; /* DIF block number Video: 0-134, Audio: 0-8 */
|
|
return 3;
|
|
}
|
|
|
|
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
|
|
{
|
|
if (syb_num == 0 || syb_num == 6) {
|
|
buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
|
|
(0<<4) | /* AP3 (Subcode application ID) */
|
|
0x0f; /* reserved -- always 1 */
|
|
}
|
|
else if (syb_num == 11) {
|
|
buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
|
|
0x7f; /* reserved -- always 1 */
|
|
}
|
|
else {
|
|
buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
|
|
(0<<4) | /* APT (Track application ID) */
|
|
0x0f; /* reserved -- always 1 */
|
|
}
|
|
buf[1] = 0xf0 | /* reserved -- always 1 */
|
|
(syb_num & 0x0f); /* SSYB number 0 - 11 */
|
|
buf[2] = 0xff; /* reserved -- always 1 */
|
|
return 3;
|
|
}
|
|
|
|
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
|
|
{
|
|
int i, j, k;
|
|
|
|
for (i = 0; i < c->sys->difseg_size; i++) {
|
|
memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
|
|
|
|
/* DV header: 1DIF */
|
|
buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
|
|
buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
|
|
buf += 72; /* unused bytes */
|
|
|
|
/* DV subcode: 2DIFs */
|
|
for (j = 0; j < 2; j++) {
|
|
buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
|
|
for (k = 0; k < 6; k++) {
|
|
buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
|
|
buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
|
|
}
|
|
buf += 29; /* unused bytes */
|
|
}
|
|
|
|
/* DV VAUX: 3DIFs */
|
|
for (j = 0; j < 3; j++) {
|
|
buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
|
|
for (k = 0; k < 15 ; k++)
|
|
buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
|
|
buf += 2; /* unused bytes */
|
|
}
|
|
|
|
/* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
|
|
for (j = 0; j < 135; j++) {
|
|
if (j%15 == 0) {
|
|
memset(buf, 0xff, 80);
|
|
buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
|
|
buf += 77; /* audio control & shuffled PCM audio */
|
|
}
|
|
buf += dv_write_dif_id(dv_sect_video, i, j, buf);
|
|
buf += 77; /* 1 video macro block: 1 bytes control
|
|
4 * 14 bytes Y 8x8 data
|
|
10 bytes Cr 8x8 data
|
|
10 bytes Cb 8x8 data */
|
|
}
|
|
}
|
|
}
|
|
|
|
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
|
|
{
|
|
int i, j, d, of, size;
|
|
size = 4 * dv_audio_frame_size(c->sys, c->frames);
|
|
for (i = 0; i < c->sys->difseg_size; i++) {
|
|
frame_ptr += 6 * 80; /* skip DIF segment header */
|
|
for (j = 0; j < 9; j++) {
|
|
dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]);
|
|
for (d = 8; d < 80; d+=2) {
|
|
of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
|
|
if (of*2 >= size)
|
|
continue;
|
|
|
|
frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
|
|
frame_ptr[d+1] = pcm[of*2]; // that DV is a big endian PCM
|
|
}
|
|
frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
|
|
}
|
|
}
|
|
}
|
|
|
|
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
|
|
{
|
|
int i, j;
|
|
int ptr = 0;
|
|
|
|
for (i = 0; i < c->sys->difseg_size; i++) {
|
|
ptr += 6 * 80; /* skip DIF segment header */
|
|
for (j = 0; j < 135; j++) {
|
|
if (j%15 == 0)
|
|
ptr += 80; /* skip Audio DIF */
|
|
ptr += 3;
|
|
memcpy(frame_ptr + ptr, video_data + ptr, 77);
|
|
ptr += 77;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the dumbest implementation of all -- it simply looks at
|
|
* a fixed offset and if pack isn't there -- fails. We might want
|
|
* to have a fallback mechanism for complete search of missing packs.
|
|
*/
|
|
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
|
|
{
|
|
int offs;
|
|
|
|
switch (t) {
|
|
case dv_audio_source:
|
|
offs = (80*6 + 80*16*3 + 3);
|
|
break;
|
|
case dv_audio_control:
|
|
offs = (80*6 + 80*16*4 + 3);
|
|
break;
|
|
case dv_video_control:
|
|
offs = (80*5 + 48 + 5);
|
|
break;
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
return (frame[offs] == t ? &frame[offs] : NULL);
|
|
}
|
|
|
|
/*
|
|
* There's a couple of assumptions being made here:
|
|
* 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
|
|
* We can pass them upwards when ffmpeg will be ready to deal with them.
|
|
* 2. We don't do software emphasis.
|
|
* 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
|
|
* are converted into 16bit linear ones.
|
|
*/
|
|
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2)
|
|
{
|
|
int size, i, j, d, of, smpls, freq, quant, half_ch;
|
|
uint16_t lc, rc;
|
|
const DVprofile* sys;
|
|
const uint8_t* as_pack;
|
|
|
|
as_pack = dv_extract_pack(frame, dv_audio_source);
|
|
if (!as_pack) /* No audio ? */
|
|
return 0;
|
|
|
|
sys = dv_frame_profile(frame);
|
|
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
|
|
freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
|
|
quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
|
|
|
|
if (quant > 1)
|
|
return -1; /* Unsupported quantization */
|
|
|
|
size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
|
|
half_ch = sys->difseg_size/2;
|
|
|
|
/* for each DIF segment */
|
|
for (i = 0; i < sys->difseg_size; i++) {
|
|
frame += 6 * 80; /* skip DIF segment header */
|
|
if (quant == 1 && i == half_ch) {
|
|
if (!pcm2)
|
|
break;
|
|
else
|
|
pcm = pcm2;
|
|
}
|
|
|
|
for (j = 0; j < 9; j++) {
|
|
for (d = 8; d < 80; d += 2) {
|
|
if (quant == 0) { /* 16bit quantization */
|
|
of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
|
|
if (of*2 >= size)
|
|
continue;
|
|
|
|
pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
|
|
pcm[of*2+1] = frame[d]; // that DV is a big endian PCM
|
|
if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
|
|
pcm[of*2+1] = 0;
|
|
} else { /* 12bit quantization */
|
|
lc = ((uint16_t)frame[d] << 4) |
|
|
((uint16_t)frame[d+2] >> 4);
|
|
rc = ((uint16_t)frame[d+1] << 4) |
|
|
((uint16_t)frame[d+2] & 0x0f);
|
|
lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
|
|
rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
|
|
|
|
of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
|
|
if (of*2 >= size)
|
|
continue;
|
|
|
|
pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
|
|
pcm[of*2+1] = lc >> 8; // that DV is a big endian PCM
|
|
of = sys->audio_shuffle[i%half_ch+half_ch][j] +
|
|
(d - 8)/3 * sys->audio_stride;
|
|
pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
|
|
pcm[of*2+1] = rc >> 8; // that DV is a big endian PCM
|
|
++d;
|
|
}
|
|
}
|
|
|
|
frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
|
|
{
|
|
const uint8_t* as_pack;
|
|
const DVprofile* sys;
|
|
int freq, smpls, quant, i, ach;
|
|
|
|
sys = dv_frame_profile(frame);
|
|
as_pack = dv_extract_pack(frame, dv_audio_source);
|
|
if (!as_pack || !sys) { /* No audio ? */
|
|
c->ach = 0;
|
|
return 0;
|
|
}
|
|
|
|
smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
|
|
freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
|
|
quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
|
|
ach = (quant && freq == 2) ? 2 : 1;
|
|
|
|
/* Dynamic handling of the audio streams in DV */
|
|
for (i=0; i<ach; i++) {
|
|
if (!c->ast[i]) {
|
|
c->ast[i] = av_new_stream(c->fctx, 0);
|
|
if (!c->ast[i])
|
|
break;
|
|
av_set_pts_info(c->ast[i], 64, 1, 30000);
|
|
c->ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
c->ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
|
|
|
|
av_init_packet(&c->audio_pkt[i]);
|
|
c->audio_pkt[i].size = 0;
|
|
c->audio_pkt[i].data = c->audio_buf[i];
|
|
c->audio_pkt[i].stream_index = c->ast[i]->index;
|
|
c->audio_pkt[i].flags |= PKT_FLAG_KEY;
|
|
}
|
|
c->ast[i]->codec->sample_rate = dv_audio_frequency[freq];
|
|
c->ast[i]->codec->channels = 2;
|
|
c->ast[i]->codec->bit_rate = 2 * dv_audio_frequency[freq] * 16;
|
|
c->ast[i]->start_time = 0;
|
|
}
|
|
c->ach = i;
|
|
|
|
return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
|
|
}
|
|
|
|
static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
|
|
{
|
|
const DVprofile* sys;
|
|
const uint8_t* vsc_pack;
|
|
AVCodecContext* avctx;
|
|
int apt, is16_9;
|
|
int size = 0;
|
|
|
|
sys = dv_frame_profile(frame);
|
|
if (sys) {
|
|
avctx = c->vst->codec;
|
|
|
|
av_set_pts_info(c->vst, 64, sys->frame_rate_base, sys->frame_rate);
|
|
avctx->time_base= (AVRational){sys->frame_rate_base, sys->frame_rate};
|
|
if(!avctx->width){
|
|
avctx->width = sys->width;
|
|
avctx->height = sys->height;
|
|
}
|
|
avctx->pix_fmt = sys->pix_fmt;
|
|
|
|
/* finding out SAR is a little bit messy */
|
|
vsc_pack = dv_extract_pack(frame, dv_video_control);
|
|
apt = frame[4] & 0x07;
|
|
is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
|
|
(!apt && (vsc_pack[2] & 0x07) == 0x07)));
|
|
avctx->sample_aspect_ratio = sys->sar[is16_9];
|
|
|
|
size = sys->frame_size;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* The following 6 functions constitute our interface to the world
|
|
*/
|
|
|
|
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
|
|
const uint8_t* data, int data_size, uint8_t** frame)
|
|
{
|
|
uint8_t pcm[8192];
|
|
int fsize, reqasize;
|
|
|
|
*frame = &c->frame_buf[0];
|
|
if (c->has_audio && c->has_video) { /* must be a stale frame */
|
|
dv_format_frame(c, *frame);
|
|
c->frames++;
|
|
if (c->has_audio > 0)
|
|
c->has_audio = 0;
|
|
c->has_video = 0;
|
|
}
|
|
|
|
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
|
/* FIXME: we have to have more sensible approach than this one */
|
|
if (c->has_video)
|
|
av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
|
|
|
|
dv_inject_video(c, data, *frame);
|
|
c->has_video = 1;
|
|
data_size = 0;
|
|
if (c->has_audio < 0)
|
|
goto out;
|
|
}
|
|
|
|
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
|
|
fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
|
|
if (st->codec->codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) {
|
|
if (fsize + data_size >= reqasize && !c->has_audio) {
|
|
if (fsize >= reqasize) {
|
|
fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
|
|
} else {
|
|
fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
|
|
memcpy(&pcm[fsize], &data[0], reqasize - fsize);
|
|
data += reqasize - fsize;
|
|
data_size -= reqasize - fsize;
|
|
}
|
|
dv_inject_audio(c, &pcm[0], *frame);
|
|
c->has_audio = 1;
|
|
}
|
|
|
|
/* FIXME: we have to have more sensible approach than this one */
|
|
if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
|
|
av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
|
|
fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
|
|
}
|
|
|
|
out:
|
|
return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
|
|
}
|
|
|
|
DVMuxContext* dv_init_mux(AVFormatContext* s)
|
|
{
|
|
DVMuxContext *c;
|
|
AVStream *vst = NULL;
|
|
AVStream *ast = NULL;
|
|
int i;
|
|
|
|
if (s->nb_streams > 2)
|
|
return NULL;
|
|
|
|
c = av_mallocz(sizeof(DVMuxContext));
|
|
if (!c)
|
|
return NULL;
|
|
|
|
/* We have to sort out where audio and where video stream is */
|
|
for (i=0; i<s->nb_streams; i++) {
|
|
switch (s->streams[i]->codec->codec_type) {
|
|
case CODEC_TYPE_VIDEO:
|
|
vst = s->streams[i];
|
|
break;
|
|
case CODEC_TYPE_AUDIO:
|
|
ast = s->streams[i];
|
|
break;
|
|
default:
|
|
goto bail_out;
|
|
}
|
|
}
|
|
|
|
/* Some checks -- DV format is very picky about its incoming streams */
|
|
if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
|
|
goto bail_out;
|
|
if (ast && (ast->codec->codec_id != CODEC_ID_PCM_S16LE ||
|
|
ast->codec->sample_rate != 48000 ||
|
|
ast->codec->channels != 2))
|
|
goto bail_out;
|
|
c->sys = dv_codec_profile(vst->codec);
|
|
if (!c->sys)
|
|
goto bail_out;
|
|
|
|
/* Ok, everything seems to be in working order */
|
|
c->frames = 0;
|
|
c->has_audio = ast ? 0 : -1;
|
|
c->has_video = 0;
|
|
c->start_time = (time_t)s->timestamp;
|
|
c->aspect = 0; /* 4:3 is the default */
|
|
if ((int)(av_q2d(vst->codec->sample_aspect_ratio) * vst->codec->width / vst->codec->height * 10) == 17) /* 16:9 */
|
|
c->aspect = 0x07;
|
|
|
|
if (ast && fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
|
|
goto bail_out;
|
|
|
|
dv_format_frame(c, &c->frame_buf[0]);
|
|
|
|
return c;
|
|
|
|
bail_out:
|
|
av_free(c);
|
|
return NULL;
|
|
}
|
|
|
|
void dv_delete_mux(DVMuxContext *c)
|
|
{
|
|
fifo_free(&c->audio_data);
|
|
}
|
|
|
|
DVDemuxContext* dv_init_demux(AVFormatContext *s)
|
|
{
|
|
DVDemuxContext *c;
|
|
|
|
c = av_mallocz(sizeof(DVDemuxContext));
|
|
if (!c)
|
|
return NULL;
|
|
|
|
c->vst = av_new_stream(s, 0);
|
|
if (!c->vst) {
|
|
av_free(c);
|
|
return NULL;
|
|
}
|
|
|
|
c->fctx = s;
|
|
c->ast[0] = c->ast[1] = NULL;
|
|
c->ach = 0;
|
|
c->frames = 0;
|
|
c->abytes = 0;
|
|
|
|
c->vst->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
|
|
c->vst->codec->bit_rate = 25000000;
|
|
c->vst->start_time = 0;
|
|
|
|
return c;
|
|
}
|
|
|
|
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
|
|
{
|
|
int size = -1;
|
|
int i;
|
|
|
|
for (i=0; i<c->ach; i++) {
|
|
if (c->ast[i] && c->audio_pkt[i].size) {
|
|
*pkt = c->audio_pkt[i];
|
|
c->audio_pkt[i].size = 0;
|
|
size = pkt->size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
|
|
uint8_t* buf, int buf_size)
|
|
{
|
|
int size, i;
|
|
const DVprofile* sys = dv_frame_profile(buf);
|
|
|
|
if (buf_size < 4 || buf_size < sys->frame_size)
|
|
return -1; /* Broken frame, or not enough data */
|
|
|
|
/* Queueing audio packet */
|
|
/* FIXME: in case of no audio/bad audio we have to do something */
|
|
size = dv_extract_audio_info(c, buf);
|
|
for (i=0; i<c->ach; i++) {
|
|
c->audio_pkt[i].size = size;
|
|
c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
|
|
}
|
|
dv_extract_audio(buf, c->audio_buf[0], c->audio_buf[1]);
|
|
c->abytes += size;
|
|
|
|
/* Now it's time to return video packet */
|
|
size = dv_extract_video_info(c, buf);
|
|
av_init_packet(pkt);
|
|
pkt->data = buf;
|
|
pkt->size = size;
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
pkt->stream_index = c->vst->id;
|
|
pkt->pts = c->frames;
|
|
|
|
c->frames++;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
// FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
|
|
const DVprofile* sys = dv_codec_profile(c->vst->codec);
|
|
int64_t offset;
|
|
int64_t size = url_fsize(&s->pb);
|
|
int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size;
|
|
|
|
offset = sys->frame_size * timestamp;
|
|
|
|
if (offset > max_offset) offset = max_offset;
|
|
else if (offset < 0) offset = 0;
|
|
|
|
return offset;
|
|
}
|
|
|
|
void dv_flush_audio_packets(DVDemuxContext *c)
|
|
{
|
|
c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
|
|
}
|
|
|
|
/************************************************************
|
|
* Implementation of the easiest DV storage of all -- raw DV.
|
|
************************************************************/
|
|
|
|
typedef struct RawDVContext {
|
|
uint8_t buf[144000];
|
|
DVDemuxContext* dv_demux;
|
|
} RawDVContext;
|
|
|
|
static int dv_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
RawDVContext *c = s->priv_data;
|
|
const DVprofile* sys;
|
|
c->dv_demux = dv_init_demux(s);
|
|
if (!c->dv_demux)
|
|
return -1;
|
|
|
|
if (get_buffer(&s->pb, c->buf, 4) <= 0 || url_fseek(&s->pb, -4, SEEK_CUR) < 0)
|
|
return AVERROR_IO;
|
|
|
|
sys = dv_frame_profile(c->buf);
|
|
s->bit_rate = av_rescale(sys->frame_size * 8, sys->frame_rate, sys->frame_rate_base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int size;
|
|
RawDVContext *c = s->priv_data;
|
|
|
|
size = dv_get_packet(c->dv_demux, pkt);
|
|
|
|
if (size < 0) {
|
|
if (get_buffer(&s->pb, c->buf, 4) <= 0)
|
|
return AVERROR_IO;
|
|
|
|
size = dv_frame_profile(c->buf)->frame_size;
|
|
if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
|
|
return AVERROR_IO;
|
|
|
|
size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
static int dv_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
RawDVContext *r = s->priv_data;
|
|
DVDemuxContext *c = r->dv_demux;
|
|
int64_t offset= dv_frame_offset(s, c, timestamp, flags);
|
|
const DVprofile* sys = dv_codec_profile(c->vst->codec);
|
|
|
|
c->frames= offset / sys->frame_size;
|
|
if (c->ach)
|
|
c->abytes= av_rescale(c->frames,
|
|
c->ast[0]->codec->bit_rate * (int64_t)sys->frame_rate_base,
|
|
8*sys->frame_rate);
|
|
|
|
dv_flush_audio_packets(c);
|
|
return url_fseek(&s->pb, offset, SEEK_SET);
|
|
}
|
|
|
|
static int dv_read_close(AVFormatContext *s)
|
|
{
|
|
RawDVContext *c = s->priv_data;
|
|
av_free(c->dv_demux);
|
|
return 0;
|
|
}
|
|
|
|
static int dv_write_header(AVFormatContext *s)
|
|
{
|
|
s->priv_data = dv_init_mux(s);
|
|
if (!s->priv_data) {
|
|
av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
|
|
"Make sure that you supply exactly two streams:\n"
|
|
" video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
uint8_t* frame;
|
|
int fsize;
|
|
|
|
fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[pkt->stream_index],
|
|
pkt->data, pkt->size, &frame);
|
|
if (fsize > 0) {
|
|
put_buffer(&s->pb, frame, fsize);
|
|
put_flush_packet(&s->pb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We might end up with some extra A/V data without matching counterpart.
|
|
* E.g. video data without enough audio to write the complete frame.
|
|
* Currently we simply drop the last frame. I don't know whether this
|
|
* is the best strategy of all
|
|
*/
|
|
static int dv_write_trailer(struct AVFormatContext *s)
|
|
{
|
|
dv_delete_mux((DVMuxContext *)s->priv_data);
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat dv_iformat = {
|
|
"dv",
|
|
"DV video format",
|
|
sizeof(RawDVContext),
|
|
NULL,
|
|
dv_read_header,
|
|
dv_read_packet,
|
|
dv_read_close,
|
|
dv_read_seek,
|
|
.extensions = "dv,dif",
|
|
};
|
|
|
|
static AVOutputFormat dv_oformat = {
|
|
"dv",
|
|
"DV video format",
|
|
NULL,
|
|
"dv",
|
|
sizeof(DVMuxContext),
|
|
CODEC_ID_PCM_S16LE,
|
|
CODEC_ID_DVVIDEO,
|
|
dv_write_header,
|
|
dv_write_packet,
|
|
dv_write_trailer,
|
|
};
|
|
|
|
int ff_dv_init(void)
|
|
{
|
|
av_register_input_format(&dv_iformat);
|
|
av_register_output_format(&dv_oformat);
|
|
return 0;
|
|
}
|