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Split the DV demuxer and muxer into separate files (as suggested by Diego 

Biurrun).

Originally committed as revision 6272 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Panagiotis Issaris 18 years ago
parent
bcce83e693
commit
d4fc91b449
3 changed files with 415 additions and 379 deletions
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  1. +1
    -1
      libavformat/Makefile
  2. +1
    -378
      libavformat/dv.c
  3. +413
    -0
      libavformat/dvenc.c

+ 1
- 1
libavformat/Makefile View File

@@ -32,7 +32,7 @@ OBJS-$(CONFIG_CRC_MUXER) += crc.o
OBJS-$(CONFIG_FRAMECRC_MUXER) += crc.o OBJS-$(CONFIG_FRAMECRC_MUXER) += crc.o
OBJS-$(CONFIG_DAUD_DEMUXER) += daud.o OBJS-$(CONFIG_DAUD_DEMUXER) += daud.o
OBJS-$(CONFIG_DV_DEMUXER) += dv.o OBJS-$(CONFIG_DV_DEMUXER) += dv.o
OBJS-$(CONFIG_DV_MUXER) += dv.o
OBJS-$(CONFIG_DV_MUXER) += dvenc.o
OBJS-$(CONFIG_EA_DEMUXER) += electronicarts.o OBJS-$(CONFIG_EA_DEMUXER) += electronicarts.o
OBJS-$(CONFIG_FFM_DEMUXER) += ffm.o OBJS-$(CONFIG_FFM_DEMUXER) += ffm.o
OBJS-$(CONFIG_FFM_MUXER) += ffm.o OBJS-$(CONFIG_FFM_MUXER) += ffm.o


+ 1
- 378
libavformat/dv.c View File

@@ -42,33 +42,6 @@ struct DVDemuxContext {
uint64_t abytes; uint64_t abytes;
}; };


struct DVMuxContext {
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
int n_ast; /* Number of stereo audio streams (up to 2) */
AVStream *ast[2]; /* Stereo audio streams */
FifoBuffer audio_data[2]; /* Fifo for storing excessive amounts of PCM */
int frames; /* Number of a current frame */
time_t start_time; /* Start time of recording */
int has_audio; /* frame under contruction has audio */
int has_video; /* frame under contruction has video */
uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */
};

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) static inline uint16_t dv_audio_12to16(uint16_t sample)
{ {
uint16_t shift, result; uint16_t shift, result;
@@ -89,171 +62,6 @@ static inline uint16_t dv_audio_12to16(uint16_t sample)
return result; 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;

/* Its hard to tell what SMPTE requires w.r.t. APT, but Quicktime needs it.
* We set it based on pix_fmt value but it really should be per DV profile */
int apt = (c->sys->pix_fmt == PIX_FMT_YUV422P ? 1 : 0);

buf[0] = (uint8_t)pack_id;
switch (pack_id) {
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 */
(apt << 1);/* definition: 0 -- 25Mbps, 2 -- 50Mbps */
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_video_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;
default:
buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
}
return 5;
}

static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
{
int i, j, d, of, size;
size = 4 * dv_audio_frame_size(c->sys, c->frames);
frame_ptr += channel * c->sys->difseg_size * 150 * 80;
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] = fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: may be we have to admit
frame_ptr[d+1] = fifo_peek(&c->audio_data[channel], of*2); // that DV is a big endian PCM
}
frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}
}
}

static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
{
int j, k;
uint8_t* buf;

for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
/* DV subcode: 2nd and 3d DIFs */
for (j = 80; j < 80 * 3; j += 80) {
for (k = 6; k < 6 * 8; k += 8)
dv_write_pack(dv_timecode, c, &buf[j+k]);

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 ? */
dv_write_pack(dv_video_recdate, c, &buf[j+14]);
dv_write_pack(dv_video_rectime, c, &buf[j+22]);
dv_write_pack(dv_video_recdate, c, &buf[j+38]);
dv_write_pack(dv_video_rectime, c, &buf[j+46]);
}
}

/* DV VAUX: 4th, 5th and 6th 3DIFs */
for (j = 80*3 + 3; j < 80*6; j += 80) {
dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
}
}
}

/* /*
* This is the dumbest implementation of all -- it simply looks at * This is the dumbest implementation of all -- it simply looks at
* a fixed offset and if pack isn't there -- fails. We might want * a fixed offset and if pack isn't there -- fails. We might want
@@ -447,139 +255,9 @@ static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
} }


/* /*
* The following 6 functions constitute our interface to the world
* The following 3 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)
{
int i, reqasize;

*frame = &c->frame_buf[0];
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);

switch (st->codec->codec_type) {
case 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);

memcpy(*frame, data, c->sys->frame_size);
c->has_video = 1;
break;
case CODEC_TYPE_AUDIO:
for (i = 0; i < c->n_ast && st != c->ast[i]; i++);

/* FIXME: we have to have more sensible approach than this one */
if (fifo_size(&c->audio_data[i], c->audio_data[i].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[i], data, data_size, &c->audio_data[i].wptr);

/* Lets see if we've got enough audio for one DV frame */
c->has_audio |= ((reqasize <= fifo_size(&c->audio_data[i], c->audio_data[i].rptr)) << i);

break;
default:
break;
}

/* Lets see if we have enough data to construct one DV frame */
if (c->has_video == 1 && c->has_audio + 1 == 1<<c->n_ast) {
dv_inject_metadata(c, *frame);
for (i=0; i<c->n_ast; i++) {
dv_inject_audio(c, i, *frame);
fifo_drain(&c->audio_data[i], reqasize);
}

c->has_video = 0;
c->has_audio = 0;
c->frames++;

return c->sys->frame_size;
}

return 0;
}

DVMuxContext* dv_init_mux(AVFormatContext* s)
{
DVMuxContext *c;
AVStream *vst = NULL;
int i;

/* we support at most 1 video and 2 audio streams */
if (s->nb_streams > 3)
return NULL;

c = av_mallocz(sizeof(DVMuxContext));
if (!c)
return NULL;

c->n_ast = 0;
c->ast[0] = c->ast[1] = 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:
c->ast[c->n_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;
for (i=0; i<c->n_ast; i++) {
if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE ||
c->ast[i]->codec->sample_rate != 48000 ||
c->ast[i]->codec->channels != 2))
goto bail_out;
}
c->sys = dv_codec_profile(vst->codec);
if (!c->sys)
goto bail_out;

if((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
/* only 1 stereo pair is allowed in 25Mbps mode */
goto bail_out;
}

/* Ok, everything seems to be in working order */
c->frames = 0;
c->has_audio = 0;
c->has_video = 0;
c->start_time = (time_t)s->timestamp;

for (i=0; i<c->n_ast; i++) {
if (c->ast[i] && fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) {
while (i>0) {
i--;
fifo_free(&c->audio_data[i]);
}
goto bail_out;
}
}

return c;

bail_out:
av_free(c);
return NULL;
}

void dv_delete_mux(DVMuxContext *c)
{
int i;
for (i=0; i < c->n_ast; i++)
fifo_free(&c->audio_data[i]);
}

DVDemuxContext* dv_init_demux(AVFormatContext *s) DVDemuxContext* dv_init_demux(AVFormatContext *s)
{ {
DVDemuxContext *c; DVDemuxContext *c;
@@ -756,47 +434,6 @@ static int dv_read_close(AVFormatContext *s)
return 0; return 0;
} }


#ifdef CONFIG_MUXERS
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"
" (50Mbps allows an optional second audio stream)\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;
}
#endif /* CONFIG_MUXERS */

#ifdef CONFIG_DV_DEMUXER #ifdef CONFIG_DV_DEMUXER
AVInputFormat dv_demuxer = { AVInputFormat dv_demuxer = {
"dv", "dv",
@@ -810,17 +447,3 @@ AVInputFormat dv_demuxer = {
.extensions = "dv,dif", .extensions = "dv,dif",
}; };
#endif #endif
#ifdef CONFIG_DV_MUXER
AVOutputFormat dv_muxer = {
"dv",
"DV video format",
NULL,
"dv",
sizeof(DVMuxContext),
CODEC_ID_PCM_S16LE,
CODEC_ID_DVVIDEO,
dv_write_header,
dv_write_packet,
dv_write_trailer,
};
#endif

+ 413
- 0
libavformat/dvenc.c View File

@@ -0,0 +1,413 @@
/*
* General DV muxer/demuxer
* Copyright (c) 2003 Roman Shaposhnik
*
* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
* of DV technical info.
*
* Raw DV format
* Copyright (c) 2002 Fabrice Bellard.
*
* 50 Mbps (DVCPRO50) support
* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <time.h>
#include "avformat.h"
#include "dvdata.h"
#include "dv.h"

struct DVMuxContext {
const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
int n_ast; /* Number of stereo audio streams (up to 2) */
AVStream *ast[2]; /* Stereo audio streams */
FifoBuffer audio_data[2]; /* Fifo for storing excessive amounts of PCM */
int frames; /* Number of a current frame */
time_t start_time; /* Start time of recording */
int has_audio; /* frame under contruction has audio */
int has_video; /* frame under contruction has video */
uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */
};

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 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;

/* Its hard to tell what SMPTE requires w.r.t. APT, but Quicktime needs it.
* We set it based on pix_fmt value but it really should be per DV profile */
int apt = (c->sys->pix_fmt == PIX_FMT_YUV422P ? 1 : 0);

buf[0] = (uint8_t)pack_id;
switch (pack_id) {
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 */
(apt << 1);/* definition: 0 -- 25Mbps, 2 -- 50Mbps */
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_video_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;
default:
buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
}
return 5;
}

static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
{
int i, j, d, of, size;
size = 4 * dv_audio_frame_size(c->sys, c->frames);
frame_ptr += channel * c->sys->difseg_size * 150 * 80;
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] = fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: may be we have to admit
frame_ptr[d+1] = fifo_peek(&c->audio_data[channel], of*2); // that DV is a big endian PCM
}
frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}
}
}

static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
{
int j, k;
uint8_t* buf;

for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
/* DV subcode: 2nd and 3d DIFs */
for (j = 80; j < 80 * 3; j += 80) {
for (k = 6; k < 6 * 8; k += 8)
dv_write_pack(dv_timecode, c, &buf[j+k]);

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 ? */
dv_write_pack(dv_video_recdate, c, &buf[j+14]);
dv_write_pack(dv_video_rectime, c, &buf[j+22]);
dv_write_pack(dv_video_recdate, c, &buf[j+38]);
dv_write_pack(dv_video_rectime, c, &buf[j+46]);
}
}

/* DV VAUX: 4th, 5th and 6th 3DIFs */
for (j = 80*3 + 3; j < 80*6; j += 80) {
dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
}
}
}

/*
* The following 3 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)
{
int i, reqasize;

*frame = &c->frame_buf[0];
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);

switch (st->codec->codec_type) {
case 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);

memcpy(*frame, data, c->sys->frame_size);
c->has_video = 1;
break;
case CODEC_TYPE_AUDIO:
for (i = 0; i < c->n_ast && st != c->ast[i]; i++);

/* FIXME: we have to have more sensible approach than this one */
if (fifo_size(&c->audio_data[i], c->audio_data[i].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[i], data, data_size, &c->audio_data[i].wptr);

/* Lets see if we've got enough audio for one DV frame */
c->has_audio |= ((reqasize <= fifo_size(&c->audio_data[i], c->audio_data[i].rptr)) << i);

break;
default:
break;
}

/* Lets see if we have enough data to construct one DV frame */
if (c->has_video == 1 && c->has_audio + 1 == 1<<c->n_ast) {
dv_inject_metadata(c, *frame);
for (i=0; i<c->n_ast; i++) {
dv_inject_audio(c, i, *frame);
fifo_drain(&c->audio_data[i], reqasize);
}

c->has_video = 0;
c->has_audio = 0;
c->frames++;

return c->sys->frame_size;
}

return 0;
}

DVMuxContext* dv_init_mux(AVFormatContext* s)
{
DVMuxContext *c;
AVStream *vst = NULL;
int i;

/* we support at most 1 video and 2 audio streams */
if (s->nb_streams > 3)
return NULL;

c = av_mallocz(sizeof(DVMuxContext));
if (!c)
return NULL;

c->n_ast = 0;
c->ast[0] = c->ast[1] = 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:
c->ast[c->n_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;
for (i=0; i<c->n_ast; i++) {
if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE ||
c->ast[i]->codec->sample_rate != 48000 ||
c->ast[i]->codec->channels != 2))
goto bail_out;
}
c->sys = dv_codec_profile(vst->codec);
if (!c->sys)
goto bail_out;

if((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
/* only 1 stereo pair is allowed in 25Mbps mode */
goto bail_out;
}

/* Ok, everything seems to be in working order */
c->frames = 0;
c->has_audio = 0;
c->has_video = 0;
c->start_time = (time_t)s->timestamp;

for (i=0; i<c->n_ast; i++) {
if (c->ast[i] && fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) {
while (i>0) {
i--;
fifo_free(&c->audio_data[i]);
}
goto bail_out;
}
}

return c;

bail_out:
av_free(c);
return NULL;
}

void dv_delete_mux(DVMuxContext *c)
{
int i;
for (i=0; i < c->n_ast; i++)
fifo_free(&c->audio_data[i]);
}

#ifdef CONFIG_MUXERS
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"
" (50Mbps allows an optional second audio stream)\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;
}
#endif /* CONFIG_MUXERS */

#ifdef CONFIG_DV_MUXER
AVOutputFormat dv_muxer = {
"dv",
"DV video format",
NULL,
"dv",
sizeof(DVMuxContext),
CODEC_ID_PCM_S16LE,
CODEC_ID_DVVIDEO,
dv_write_header,
dv_write_packet,
dv_write_trailer,
};
#endif

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