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FFmpeg/libavformat/dvenc.c

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/*
* 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 file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <time.h>
#include "libavutil/time_internal.h"
#include "avformat.h"
#include "libavcodec/dv_profile.h"
#include "libavcodec/dv.h"
#include "dv.h"
#include "mux.h"
#include "libavutil/avassert.h"
#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timecode.h"
#define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio
typedef struct DVMuxContext {
AVClass *av_class;
const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */
int n_ast; /* number of stereo audio streams (up to 2) */
AVStream *ast[4]; /* stereo audio streams */
AVFifo *audio_data[4]; /* FIFO for storing excessive amounts of PCM */
int frames; /* current frame number */
int64_t start_time; /* recording start time */
int has_audio; /* frame under construction has audio */
int has_video; /* frame under construction has video */
uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */
AVTimecode tc; /* timecode context */
} DVMuxContext;
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 void brktimegm(time_t secs, struct tm *tm)
{
tm = gmtime_r(&secs, tm);
tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */
tm->tm_mon += 1; /* unlike gmtime_r tm_mon is from 1 to 12 */
}
static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate)
{
if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) {
if (sample_rate == 32000) return 1280;
else if (sample_rate == 44100) return 1764;
else return 1920;
}
av_assert0(sample_rate == 48000);
return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) /
sizeof(sys->audio_samples_dist[0]))];
}
static int dv_write_pack(enum DVPackType pack_id, DVMuxContext *c, uint8_t* buf, int channel, int seq)
{
struct tm tc;
time_t ct;
uint32_t timecode;
int audio_type = 0;
buf[0] = (uint8_t)pack_id;
switch (pack_id) {
case DV_TIMECODE:
timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames);
timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
AV_WB32(buf + 1, timecode);
break;
case DV_AUDIO_SOURCE: /* AAUX source pack */
if (c->ast[channel]->codecpar->sample_rate == 44100) {
audio_type = 1;
} else if (c->ast[channel]->codecpar->sample_rate == 32000)
audio_type = 2;
buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
(1 << 6) | /* reserved -- always 1 */
(dv_audio_frame_size(c->sys, c->frames, c->ast[channel]->codecpar->sample_rate) -
c->sys->audio_min_samples[audio_type]);
/* # 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 */
(seq >= c->sys->difseg_size/2); /* audio mode (1st or 2nd channel) */
buf[3] = (1 << 7) | /* res */
(1 << 6) | /* multi-language flag */
(c->sys->dsf << 5) | /* system: 60fields/50fields */
(DV_PROFILE_IS_HD(c->sys) ? 0x3 : c->sys->video_stype ? 2 : 0); /* stype */
buf[4] = (1 << 7) | /* emphasis: 1 -- off */
(0 << 6) | /* emphasis time constant: 0 -- reserved */
(audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */
0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit 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 */
(c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */
c->sys->ltc_divisor * 4);
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 + av_rescale_rnd(c->frames, c->sys->time_base.num,
c->sys->time_base.den, AV_ROUND_DOWN);
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 + av_rescale_rnd(c->frames, c->sys->time_base.num,
c->sys->time_base.den, AV_ROUND_DOWN);
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, c->ast[channel]->codecpar->sample_rate);
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], channel, i);
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;
// FIXME: maybe we have to admit that DV is a big-endian PCM
av_fifo_peek(c->audio_data[channel], frame_ptr + d, 2, of * 2);
FFSWAP(uint8_t, frame_ptr[d], frame_ptr[d + 1]);
}
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;
int seq = 0;
for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80, seq++) {
/* 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], 0, seq);
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], 0, seq);
dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+22], 0, seq);
dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+38], 0, seq);
dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+46], 0, seq);
}
}
/* 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], 0, seq);
dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5* 3], 0, seq);
dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+5*11], 0, seq);
dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5*12], 0, seq);
}
}
}
/*
* The following 3 functions constitute our interface to the world
*/
static int dv_assemble_frame(AVFormatContext *s,
DVMuxContext *c, AVStream* st,
const uint8_t *data, int data_size, uint8_t **frame)
{
int i, reqasize;
*frame = &c->frame_buf[0];
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
/* FIXME: we have to have more sensible approach than this one */
if (c->has_video) {
av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
return AVERROR(EINVAL);
}
if (data_size != c->sys->frame_size) {
av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n",
data_size, c->sys->frame_size);
return AVERROR(ENOSYS);
}
memcpy(*frame, data, c->sys->frame_size);
c->has_video = 1;
break;
case AVMEDIA_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 (av_fifo_can_write(c->audio_data[i]) < data_size) {
av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
return AVERROR(EINVAL);
}
av_fifo_write(c->audio_data[i], data, data_size);
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate);
/* Let us see if we've got enough audio for one DV frame. */
c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i);
break;
default:
break;
}
/* Let us 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);
c->has_audio = 0;
for (i=0; i < c->n_ast; i++) {
dv_inject_audio(c, i, *frame);
reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate);
av_fifo_drain2(c->audio_data[i], reqasize);
c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i);
}
c->has_video = 0;
c->frames++;
return c->sys->frame_size;
}
return 0;
}
static int dv_init_mux(AVFormatContext* s)
{
DVMuxContext *c = s->priv_data;
AVStream *vst = NULL;
int i;
if (s->nb_streams > 5) {
av_log(s, AV_LOG_ERROR,
"Invalid number of streams %d, the muxer supports at most 1 video channel and 4 audio channels.\n",
s->nb_streams);
return AVERROR_INVALIDDATA;
}
/* We have to sort out where audio and where video stream is */
for (i=0; i<s->nb_streams; i++) {
AVStream *st = s->streams[i];
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (vst) {
av_log(s, AV_LOG_ERROR,
"More than one video stream found, only one is accepted.\n");
return AVERROR_INVALIDDATA;
}
if (st->codecpar->codec_id != AV_CODEC_ID_DVVIDEO) {
av_log(s, AV_LOG_ERROR,
"Invalid codec for video stream, only DVVIDEO is supported.\n");
return AVERROR_INVALIDDATA;
}
vst = st;
break;
case AVMEDIA_TYPE_AUDIO:
if (c->n_ast > 1) {
av_log(s, AV_LOG_ERROR,
"More than two audio streams found, at most 2 are accepted.\n");
return AVERROR_INVALIDDATA;
}
/* Some checks -- DV format is very picky about its incoming streams */
if (st->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE) {
av_log(s, AV_LOG_ERROR,
"Invalid codec for stream %d, only PCM_S16LE is supported\n.", i);
return AVERROR_INVALIDDATA;
}
if (st->codecpar->ch_layout.nb_channels != 2) {
av_log(s, AV_LOG_ERROR,
"Invalid number of audio channels %d for stream %d, only 2 channels are supported\n.",
st->codecpar->ch_layout.nb_channels, i);
return AVERROR_INVALIDDATA;
}
if (st->codecpar->sample_rate != 48000 &&
st->codecpar->sample_rate != 44100 &&
st->codecpar->sample_rate != 32000) {
av_log(s, AV_LOG_ERROR,
"Invalid audio sample rate %d for stream %d, only 32000, 44100, and 48000 are supported.\n",
st->codecpar->sample_rate, i);
return AVERROR_INVALIDDATA;
}
c->ast[c->n_ast++] = st;
break;
default:
av_log(s, AV_LOG_ERROR,
"Invalid media type for stream %d, only audio and video are supported.\n", i);
return AVERROR_INVALIDDATA;
}
}
if (!vst) {
av_log(s, AV_LOG_ERROR,
"Missing video stream, must be present\n");
return AVERROR_INVALIDDATA;
}
c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height,
vst->codecpar->format, vst->time_base);
if (!c->sys) {
av_log(s, AV_LOG_ERROR,
"Could not find a valid video profile for size:%dx%d format:%s tb:%d%d\n",
vst->codecpar->width, vst->codecpar->height,
av_get_pix_fmt_name(vst->codecpar->format),
vst->time_base.num, vst->time_base.den);
return AVERROR_INVALIDDATA;
}
if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) {
for (i = 0; i < 2; i++) {
if (c->ast[i] && c->ast[i]->codecpar->sample_rate != 48000) {
av_log(s, AV_LOG_ERROR,
"Invalid sample rate %d for audio stream #%d for this video profile, must be 48000.\n",
c->ast[i]->codecpar->sample_rate, i);
return AVERROR_INVALIDDATA;
}
}
}
for (i = 1; i < 2; i++) {
if (((c->n_ast > i) && (c->sys->n_difchan < (2 * i)))) {
const char *mode = c->n_ast > 1 ? "50Mps" : "25Mps";
av_log(s, AV_LOG_ERROR,
"Invalid number of channels %d, only %d stereo pairs is allowed in %s mode.\n",
c->n_ast, i, mode);
return AVERROR_INVALIDDATA;
}
}
/* Ok, everything seems to be in working order */
c->frames = 0;
c->has_audio = 0;
c->has_video = 0;
ff_parse_creation_time_metadata(s, &c->start_time, 1);
for (i=0; i < c->n_ast; i++) {
if (!c->ast[i])
continue;
c->audio_data[i] = av_fifo_alloc2(100 * MAX_AUDIO_FRAME_SIZE, 1, 0);
if (!c->audio_data[i]) {
return AVERROR(ENOMEM);
}
}
return 0;
}
static int dv_write_header(AVFormatContext *s)
{
AVRational rate;
DVMuxContext *dvc = s->priv_data;
AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
if (dv_init_mux(s) < 0) {
av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
"Make sure that you supply at least two streams:\n"
" video: 25fps or 29.97fps, audio: 2ch/48|44.1|32kHz/PCM\n"
" (50Mbps allows an optional second audio stream)\n");
return AVERROR_INVALIDDATA;
}
rate.num = dvc->sys->ltc_divisor;
rate.den = 1;
if (!tcr) { // no global timecode, look into the streams
int i;
for (i = 0; i < s->nb_streams; i++) {
tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
if (tcr)
break;
}
}
if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0)
return 0;
return av_timecode_init(&dvc->tc, rate, 0, 0, s);
}
static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
uint8_t* frame;
int fsize;
fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index],
pkt->data, pkt->size, &frame);
if (fsize < 0) {
return fsize;
}
avio_write(s->pb, frame, fsize);
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 void dv_deinit(AVFormatContext *s)
{
DVMuxContext *c = s->priv_data;
for (int i = 0; i < c->n_ast; i++)
av_fifo_freep2(&c->audio_data[i]);
}
const FFOutputFormat ff_dv_muxer = {
.p.name = "dv",
.p.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
.p.extensions = "dv",
.priv_data_size = sizeof(DVMuxContext),
.p.audio_codec = AV_CODEC_ID_PCM_S16LE,
.p.video_codec = AV_CODEC_ID_DVVIDEO,
.write_header = dv_write_header,
.write_packet = dv_write_packet,
.deinit = dv_deinit,
};