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FFmpeg/libavformat/gxfenc.c
Andreas Rheinhardt bc70684e74 avformat: Constify all muxer/demuxers 
This is possible now that the next-API is gone.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 11:48:06 -03:00

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/*
* GXF muxer.
* Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot 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 "libavutil/avassert.h"
#include "libavutil/intfloat.h"
#include "libavutil/opt.h"
#include "libavutil/mathematics.h"
#include "libavutil/timecode.h"
#include "avformat.h"
#include "internal.h"
#include "gxf.h"
#define GXF_SAMPLES_PER_FRAME 32768
#define GXF_AUDIO_PACKET_SIZE 65536
#define GXF_TIMECODE(c, d, h, m, s, f) \
((c) << 30 | (d) << 29 | (h) << 24 | (m) << 16 | (s) << 8 | (f))
typedef struct GXFTimecode{
int hh;
int mm;
int ss;
int ff;
int color;
int drop;
} GXFTimecode;
typedef struct GXFStreamContext {
int64_t pkt_cnt;
uint32_t track_type;
uint32_t sample_size;
uint32_t sample_rate;
uint16_t media_type;
uint16_t media_info;
int frame_rate_index;
int lines_index;
int fields;
int iframes;
int pframes;
int bframes;
int p_per_gop;
int b_per_i_or_p; ///< number of B-frames per I-frame or P-frame
int first_gop_closed;
unsigned order; ///< interleaving order
} GXFStreamContext;
typedef struct GXFContext {
AVClass *av_class;
uint32_t nb_fields;
uint16_t audio_tracks;
uint16_t mpeg_tracks;
int64_t creation_time;
uint32_t umf_start_offset;
uint32_t umf_track_offset;
uint32_t umf_media_offset;
uint32_t umf_length;
uint16_t umf_track_size;
uint16_t umf_media_size;
AVRational time_base;
int flags;
GXFStreamContext timecode_track;
unsigned *flt_entries; ///< offsets of packets /1024, starts after 2nd video field
unsigned flt_entries_nb;
uint64_t *map_offsets; ///< offset of map packets
unsigned map_offsets_nb;
unsigned packet_count;
GXFTimecode tc;
} GXFContext;
static const struct {
int height, index;
} gxf_lines_tab[] = {
{ 480, 1 }, /* NTSC */
{ 512, 1 }, /* NTSC + VBI */
{ 576, 2 }, /* PAL */
{ 608, 2 }, /* PAL + VBI */
{ 1080, 4 },
{ 720, 6 },
};
static const AVCodecTag gxf_media_types[] = {
{ AV_CODEC_ID_MJPEG , 3 }, /* NTSC */
{ AV_CODEC_ID_MJPEG , 4 }, /* PAL */
{ AV_CODEC_ID_PCM_S24LE , 9 },
{ AV_CODEC_ID_PCM_S16LE , 10 },
{ AV_CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
{ AV_CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
{ AV_CODEC_ID_DVVIDEO , 13 }, /* NTSC */
{ AV_CODEC_ID_DVVIDEO , 14 }, /* PAL */
{ AV_CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
{ AV_CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
{ AV_CODEC_ID_AC3 , 17 },
//{ AV_CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
{ AV_CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
{ AV_CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
{ AV_CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
{ AV_CODEC_ID_NONE, 0 },
};
#define SERVER_PATH "EXT:/PDR/default/"
#define ES_NAME_PATTERN "EXT:/PDR/default/ES."
static int gxf_find_lines_index(AVStream *st)
{
GXFStreamContext *sc = st->priv_data;
int i;
for (i = 0; i < 6; ++i) {
if (st->codecpar->height == gxf_lines_tab[i].height) {
sc->lines_index = gxf_lines_tab[i].index;
return 0;
}
}
return -1;
}
static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
{
for (; to_pad > 0; to_pad--) {
avio_w8(pb, 0);
}
}
static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
{
int64_t curpos;
int size;
size = avio_tell(pb) - pos;
if (size % 4) {
gxf_write_padding(pb, 4 - size % 4);
size = avio_tell(pb) - pos;
}
curpos = avio_tell(pb);
avio_seek(pb, pos + 6, SEEK_SET);
avio_wb32(pb, size);
avio_seek(pb, curpos, SEEK_SET);
return curpos - pos;
}
static int64_t updateSize(AVIOContext *pb, int64_t pos)
{
int64_t curpos;
curpos = avio_tell(pb);
avio_seek(pb, pos, SEEK_SET);
avio_wb16(pb, curpos - pos - 2);
avio_seek(pb, curpos, SEEK_SET);
return curpos - pos;
}
static void gxf_write_packet_header(AVIOContext *pb, GXFPktType type)
{
avio_wb32(pb, 0); /* packet leader for synchro */
avio_w8(pb, 1);
avio_w8(pb, type); /* map packet */
avio_wb32(pb, 0); /* size */
avio_wb32(pb, 0); /* reserved */
avio_w8(pb, 0xE1); /* trailer 1 */
avio_w8(pb, 0xE2); /* trailer 2 */
}
static int gxf_write_mpeg_auxiliary(AVIOContext *pb, AVStream *st)
{
GXFStreamContext *sc = st->priv_data;
char buffer[1024];
int size, starting_line;
if (sc->iframes) {
sc->p_per_gop = sc->pframes / sc->iframes;
if (sc->pframes % sc->iframes)
sc->p_per_gop++;
if (sc->pframes) {
sc->b_per_i_or_p = sc->bframes / sc->pframes;
if (sc->bframes % sc->pframes)
sc->b_per_i_or_p++;
}
if (sc->p_per_gop > 9)
sc->p_per_gop = 9; /* ensure value won't take more than one char */
if (sc->b_per_i_or_p > 9)
sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
}
if (st->codecpar->height == 512 || st->codecpar->height == 608)
starting_line = 7; // VBI
else if (st->codecpar->height == 480)
starting_line = 20;
else
starting_line = 23; // default PAL
size = snprintf(buffer, sizeof(buffer), "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
"Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
(float)st->codecpar->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
st->codecpar->format == AV_PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
starting_line, (st->codecpar->height + 15) / 16);
av_assert0(size < sizeof(buffer));
avio_w8(pb, TRACK_MPG_AUX);
avio_w8(pb, size + 1);
avio_write(pb, (uint8_t *)buffer, size + 1);
return size + 3;
}
static int gxf_write_dv_auxiliary(AVIOContext *pb, AVStream *st)
{
int64_t track_aux_data = 0;
avio_w8(pb, TRACK_AUX);
avio_w8(pb, 8);
if (st->codecpar->format == AV_PIX_FMT_YUV420P)
track_aux_data |= 0x01; /* marks stream as DVCAM instead of DVPRO */
track_aux_data |= 0x40000000; /* aux data is valid */
avio_wl64(pb, track_aux_data);
return 8;
}
static int gxf_write_timecode_auxiliary(AVIOContext *pb, GXFContext *gxf)
{
uint32_t timecode = GXF_TIMECODE(gxf->tc.color, gxf->tc.drop,
gxf->tc.hh, gxf->tc.mm,
gxf->tc.ss, gxf->tc.ff);
avio_w8(pb, TRACK_AUX);
avio_w8(pb, 8);
avio_wl32(pb, timecode);
/* reserved */
avio_wl32(pb, 0);
return 8;
}
static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
/* track description section */
avio_w8(pb, sc->media_type + 0x80);
avio_w8(pb, index + 0xC0);
pos = avio_tell(pb);
avio_wb16(pb, 0); /* size */
/* media file name */
avio_w8(pb, TRACK_NAME);
avio_w8(pb, strlen(ES_NAME_PATTERN) + 3);
avio_write(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN) - 1);
avio_wb16(pb, sc->media_info);
avio_w8(pb, 0);
switch (sc->track_type) {
case 3: /* timecode */
gxf_write_timecode_auxiliary(pb, gxf);
break;
case 4: /* MPEG2 */
case 9: /* MPEG1 */
gxf_write_mpeg_auxiliary(pb, s->streams[index]);
break;
case 5: /* DV25 */
case 6: /* DV50 */
gxf_write_dv_auxiliary(pb, s->streams[index]);
break;
default:
avio_w8(pb, TRACK_AUX);
avio_w8(pb, 8);
avio_wl64(pb, 0);
}
/* file system version */
avio_w8(pb, TRACK_VER);
avio_w8(pb, 4);
avio_wb32(pb, 0);
/* frame rate */
avio_w8(pb, TRACK_FPS);
avio_w8(pb, 4);
avio_wb32(pb, sc->frame_rate_index);
/* lines per frame */
avio_w8(pb, TRACK_LINES);
avio_w8(pb, 4);
avio_wb32(pb, sc->lines_index);
/* fields per frame */
avio_w8(pb, TRACK_FPF);
avio_w8(pb, 4);
avio_wb32(pb, sc->fields);
return updateSize(pb, pos);
}
static int gxf_write_material_data_section(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
int len;
const char *filename = strrchr(s->url, '/');
pos = avio_tell(pb);
avio_wb16(pb, 0); /* size */
/* name */
if (filename)
filename++;
else
filename = s->url;
len = strlen(filename);
avio_w8(pb, MAT_NAME);
avio_w8(pb, strlen(SERVER_PATH) + len + 1);
avio_write(pb, SERVER_PATH, sizeof(SERVER_PATH) - 1);
avio_write(pb, filename, len);
avio_w8(pb, 0);
/* first field */
avio_w8(pb, MAT_FIRST_FIELD);
avio_w8(pb, 4);
avio_wb32(pb, 0);
/* last field */
avio_w8(pb, MAT_LAST_FIELD);
avio_w8(pb, 4);
avio_wb32(pb, gxf->nb_fields);
/* reserved */
avio_w8(pb, MAT_MARK_IN);
avio_w8(pb, 4);
avio_wb32(pb, 0);
avio_w8(pb, MAT_MARK_OUT);
avio_w8(pb, 4);
avio_wb32(pb, gxf->nb_fields);
/* estimated size */
avio_w8(pb, MAT_SIZE);
avio_w8(pb, 4);
avio_wb32(pb, avio_size(pb) / 1024);
return updateSize(pb, pos);
}
static int gxf_write_track_description_section(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
int i;
pos = avio_tell(pb);
avio_wb16(pb, 0); /* size */
for (i = 0; i < s->nb_streams; ++i)
gxf_write_track_description(s, s->streams[i]->priv_data, i);
gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
return updateSize(pb, pos);
}
static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos = avio_tell(pb);
if (!rewrite) {
if (!(gxf->map_offsets_nb % 30)) {
int err;
if ((err = av_reallocp_array(&gxf->map_offsets,
gxf->map_offsets_nb + 30,
sizeof(*gxf->map_offsets))) < 0) {
gxf->map_offsets_nb = 0;
av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
return err;
}
}
gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
}
gxf_write_packet_header(pb, PKT_MAP);
/* preamble */
avio_w8(pb, 0xE0); /* version */
avio_w8(pb, 0xFF); /* reserved */
gxf_write_material_data_section(s);
gxf_write_track_description_section(s);
return updatePacketSize(pb, pos);
}
static int gxf_write_flt_packet(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos = avio_tell(pb);
int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
int flt_entries = gxf->nb_fields / fields_per_flt;
int i = 0;
gxf_write_packet_header(pb, PKT_FLT);
avio_wl32(pb, fields_per_flt); /* number of fields */
avio_wl32(pb, flt_entries); /* number of active flt entries */
if (gxf->flt_entries) {
for (i = 0; i < flt_entries; i++)
avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
}
for (; i < 1000; i++)
avio_wl32(pb, 0);
return updatePacketSize(pb, pos);
}
static int gxf_write_umf_material_description(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
int64_t timestamp = 0;
uint64_t nb_fields;
uint32_t timecode_in; // timecode at mark in
uint32_t timecode_out; // timecode at mark out
ff_parse_creation_time_metadata(s, &timestamp, 1);
timecode_in = GXF_TIMECODE(gxf->tc.color, gxf->tc.drop,
gxf->tc.hh, gxf->tc.mm,
gxf->tc.ss, gxf->tc.ff);
nb_fields = gxf->nb_fields +
gxf->tc.hh * (timecode_base * 3600) +
gxf->tc.mm * (timecode_base * 60) +
gxf->tc.ss * timecode_base +
gxf->tc.ff;
timecode_out = GXF_TIMECODE(gxf->tc.color, gxf->tc.drop,
nb_fields / (timecode_base * 3600) % 24,
nb_fields / (timecode_base * 60) % 60,
nb_fields / timecode_base % 60,
nb_fields % timecode_base);
avio_wl32(pb, gxf->flags);
avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
avio_wl32(pb, 0); /* mark in */
avio_wl32(pb, gxf->nb_fields); /* mark out */
avio_wl32(pb, timecode_in); /* timecode mark in */
avio_wl32(pb, timecode_out); /* timecode mark out */
avio_wl64(pb, timestamp); /* modification time */
avio_wl64(pb, timestamp); /* creation time */
avio_wl16(pb, 0); /* reserved */
avio_wl16(pb, 0); /* reserved */
avio_wl16(pb, gxf->audio_tracks);
avio_wl16(pb, 1); /* timecode track count */
avio_wl16(pb, 0); /* reserved */
avio_wl16(pb, gxf->mpeg_tracks);
return 48;
}
static int gxf_write_umf_payload(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
avio_wl32(pb, 3); /* version */
avio_wl32(pb, s->nb_streams+1);
avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
avio_wl32(pb, gxf->umf_track_size);
avio_wl32(pb, s->nb_streams+1);
avio_wl32(pb, gxf->umf_media_offset);
avio_wl32(pb, gxf->umf_media_size);
avio_wl32(pb, gxf->umf_length); /* user data offset */
avio_wl32(pb, 0); /* user data size */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
return 48;
}
static int gxf_write_umf_track_description(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
GXFContext *gxf = s->priv_data;
int64_t pos = avio_tell(pb);
int i;
gxf->umf_track_offset = pos - gxf->umf_start_offset;
for (i = 0; i < s->nb_streams; ++i) {
GXFStreamContext *sc = s->streams[i]->priv_data;
avio_wl16(pb, sc->media_info);
avio_wl16(pb, 1);
}
avio_wl16(pb, gxf->timecode_track.media_info);
avio_wl16(pb, 1);
return avio_tell(pb) - pos;
}
static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
{
GXFStreamContext *sc = st->priv_data;
if (st->codecpar->format == AV_PIX_FMT_YUV422P)
avio_wl32(pb, 2);
else
avio_wl32(pb, 1); /* default to 420 */
avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
avio_wl32(pb, 1); /* I picture per GOP */
avio_wl32(pb, sc->p_per_gop);
avio_wl32(pb, sc->b_per_i_or_p);
if (st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
avio_wl32(pb, 2);
else if (st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO)
avio_wl32(pb, 1);
else
avio_wl32(pb, 0);
avio_wl32(pb, 0); /* reserved */
return 32;
}
static int gxf_write_umf_media_timecode(AVIOContext *pb, int drop)
{
avio_wl32(pb, drop); /* drop frame */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
return 32;
}
static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc, AVStream *st)
{
int dv_umf_data = 0;
if (st->codecpar->format == AV_PIX_FMT_YUV420P)
dv_umf_data |= 0x20; /* marks as DVCAM instead of DVPRO */
avio_wl32(pb, dv_umf_data);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
avio_wl32(pb, 0);
return 32;
}
static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
{
avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
avio_wl32(pb, 0); /* reserved */
avio_wl32(pb, 0); /* reserved */
return 32;
}
static int gxf_write_umf_media_description(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
int i, j;
pos = avio_tell(pb);
gxf->umf_media_offset = pos - gxf->umf_start_offset;
for (i = 0; i <= s->nb_streams; ++i) {
GXFStreamContext *sc;
int64_t startpos, curpos;
if (i == s->nb_streams)
sc = &gxf->timecode_track;
else
sc = s->streams[i]->priv_data;
startpos = avio_tell(pb);
avio_wl16(pb, 0); /* length */
avio_wl16(pb, sc->media_info);
avio_wl16(pb, 0); /* reserved */
avio_wl16(pb, 0); /* reserved */
avio_wl32(pb, gxf->nb_fields);
avio_wl32(pb, 0); /* attributes rw, ro */
avio_wl32(pb, 0); /* mark in */
avio_wl32(pb, gxf->nb_fields); /* mark out */
avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
avio_wb16(pb, sc->media_info);
for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
avio_w8(pb, 0);
avio_wl32(pb, sc->track_type);
avio_wl32(pb, sc->sample_rate);
avio_wl32(pb, sc->sample_size);
avio_wl32(pb, 0); /* reserved */
if (sc == &gxf->timecode_track)
gxf_write_umf_media_timecode(pb, gxf->tc.drop);
else {
AVStream *st = s->streams[i];
switch (st->codecpar->codec_id) {
case AV_CODEC_ID_MPEG1VIDEO:
case AV_CODEC_ID_MPEG2VIDEO:
gxf_write_umf_media_mpeg(pb, st);
break;
case AV_CODEC_ID_PCM_S16LE:
gxf_write_umf_media_audio(pb, sc);
break;
case AV_CODEC_ID_DVVIDEO:
gxf_write_umf_media_dv(pb, sc, st);
break;
}
}
curpos = avio_tell(pb);
avio_seek(pb, startpos, SEEK_SET);
avio_wl16(pb, curpos - startpos);
avio_seek(pb, curpos, SEEK_SET);
}
return avio_tell(pb) - pos;
}
static int gxf_write_umf_packet(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos = avio_tell(pb);
gxf_write_packet_header(pb, PKT_UMF);
/* preamble */
avio_w8(pb, 3); /* first and last (only) packet */
avio_wb32(pb, gxf->umf_length); /* data length */
gxf->umf_start_offset = avio_tell(pb);
gxf_write_umf_payload(s);
gxf_write_umf_material_description(s);
gxf->umf_track_size = gxf_write_umf_track_description(s);
gxf->umf_media_size = gxf_write_umf_media_description(s);
gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
return updatePacketSize(pb, pos);
}
static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
{
if (!vsc)
return;
sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
sc->sample_rate = vsc->sample_rate;
sc->media_info = ('T'<<8) | '0';
sc->track_type = 3;
sc->frame_rate_index = vsc->frame_rate_index;
sc->lines_index = vsc->lines_index;
sc->sample_size = 16;
sc->fields = vsc->fields;
}
static int gxf_init_timecode(AVFormatContext *s, GXFTimecode *tc, const char *tcstr, int fields)
{
char c;
if (sscanf(tcstr, "%d:%d:%d%c%d", &tc->hh, &tc->mm, &tc->ss, &c, &tc->ff) != 5) {
av_log(s, AV_LOG_ERROR, "unable to parse timecode, "
"syntax: hh:mm:ss[:;.]ff\n");
return -1;
}
tc->color = 0;
tc->drop = c != ':';
if (fields == 2)
tc->ff = tc->ff * 2;
return 0;
}
static int gxf_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
GXFContext *gxf = s->priv_data;
GXFStreamContext *vsc = NULL;
uint8_t tracks[255] = {0};
int i, media_info = 0;
int ret;
AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome\n");
return -1;
}
gxf->flags |= 0x00080000; /* material is simple clip */
for (i = 0; i < s->nb_streams; ++i) {
AVStream *st = s->streams[i];
GXFStreamContext *sc = av_mallocz(sizeof(*sc));
if (!sc)
return AVERROR(ENOMEM);
st->priv_data = sc;
sc->media_type = ff_codec_get_tag(gxf_media_types, st->codecpar->codec_id);
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (st->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE) {
av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
return -1;
}
if (st->codecpar->sample_rate != 48000) {
av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
return -1;
}
if (st->codecpar->channels != 1) {
av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
return -1;
}
ret = ff_stream_add_bitstream_filter(st, "pcm_rechunk", "n="AV_STRINGIFY(GXF_SAMPLES_PER_FRAME));
if (ret < 0)
return ret;
sc->track_type = 2;
sc->sample_rate = st->codecpar->sample_rate;
avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
sc->sample_size = 16;
sc->frame_rate_index = -2;
sc->lines_index = -2;
sc->fields = -2;
gxf->audio_tracks++;
gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
media_info = 'A';
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (i != 0) {
av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
return -1;
}
/* FIXME check from time_base ? */
if (st->codecpar->height == 480 || st->codecpar->height == 512) { /* NTSC or NTSC+VBI */
sc->frame_rate_index = 5;
sc->sample_rate = 60;
gxf->flags |= 0x00000080;
gxf->time_base = (AVRational){ 1001, 60000 };
} else if (st->codecpar->height == 576 || st->codecpar->height == 608) { /* PAL or PAL+VBI */
sc->frame_rate_index = 6;
sc->media_type++;
sc->sample_rate = 50;
gxf->flags |= 0x00000040;
gxf->time_base = (AVRational){ 1, 50 };
} else {
av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
"gxf muxer only accepts PAL or NTSC resolutions currently\n");
return -1;
}
if (!tcr)
tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
if (gxf_find_lines_index(st) < 0)
sc->lines_index = -1;
sc->sample_size = st->codecpar->bit_rate;
sc->fields = 2; /* interlaced */
vsc = sc;
switch (st->codecpar->codec_id) {
case AV_CODEC_ID_MJPEG:
sc->track_type = 1;
gxf->flags |= 0x00004000;
media_info = 'J';
break;
case AV_CODEC_ID_MPEG1VIDEO:
sc->track_type = 9;
gxf->mpeg_tracks++;
media_info = 'L';
break;
case AV_CODEC_ID_MPEG2VIDEO:
sc->first_gop_closed = -1;
sc->track_type = 4;
gxf->mpeg_tracks++;
gxf->flags |= 0x00008000;
media_info = 'M';
break;
case AV_CODEC_ID_DVVIDEO:
if (st->codecpar->format == AV_PIX_FMT_YUV422P) {
sc->media_type += 2;
sc->track_type = 6;
gxf->flags |= 0x00002000;
media_info = 'E';
} else {
sc->track_type = 5;
gxf->flags |= 0x00001000;
media_info = 'D';
}
break;
default:
av_log(s, AV_LOG_ERROR, "video codec not supported\n");
return -1;
}
}
/* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
sc->order = s->nb_streams - st->index;
}
if (tcr && vsc)
gxf_init_timecode(s, &gxf->tc, tcr->value, vsc->fields);
gxf_init_timecode_track(&gxf->timecode_track, vsc);
gxf->flags |= 0x200000; // time code track is non-drop frame
if ((ret = gxf_write_map_packet(s, 0)) < 0)
return ret;
gxf_write_flt_packet(s);
gxf_write_umf_packet(s);
gxf->packet_count = 3;
return 0;
}
static int gxf_write_eos_packet(AVIOContext *pb)
{
int64_t pos = avio_tell(pb);
gxf_write_packet_header(pb, PKT_EOS);
return updatePacketSize(pb, pos);
}
static int gxf_write_trailer(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t end;
int i;
int ret;
gxf_write_eos_packet(pb);
end = avio_tell(pb);
avio_seek(pb, 0, SEEK_SET);
/* overwrite map, flt and umf packets with new values */
if ((ret = gxf_write_map_packet(s, 1)) < 0)
return ret;
gxf_write_flt_packet(s);
gxf_write_umf_packet(s);
/* update duration in all map packets */
for (i = 1; i < gxf->map_offsets_nb; i++) {
avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
if ((ret = gxf_write_map_packet(s, 1)) < 0)
return ret;
}
avio_seek(pb, end, SEEK_SET);
return 0;
}
static void gxf_deinit(AVFormatContext *s)
{
GXFContext *gxf = s->priv_data;
av_freep(&gxf->flt_entries);
av_freep(&gxf->map_offsets);
}
static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
{
uint32_t c=-1;
int i;
for(i=0; i<size-4 && c!=0x100; i++){
c = (c<<8) + buf[i];
if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
sc->first_gop_closed= (buf[i+4]>>6)&1;
}
return (buf[i+1]>>3)&7;
}
static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = s->streams[pkt->stream_index];
GXFStreamContext *sc = st->priv_data;
unsigned field_nb;
/* If the video is frame-encoded, the frame numbers shall be represented by
* even field numbers.
* see SMPTE360M-2004 6.4.2.1.3 Media field number */
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
field_nb = gxf->nb_fields;
} else {
field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
(int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
}
avio_w8(pb, sc->media_type);
avio_w8(pb, st->index);
avio_wb32(pb, field_nb);
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
avio_wb16(pb, 0);
avio_wb16(pb, size / 2);
} else if (st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
if (frame_type == AV_PICTURE_TYPE_I) {
avio_w8(pb, 0x0d);
sc->iframes++;
} else if (frame_type == AV_PICTURE_TYPE_B) {
avio_w8(pb, 0x0f);
sc->bframes++;
} else {
avio_w8(pb, 0x0e);
sc->pframes++;
}
avio_wb24(pb, size);
} else if (st->codecpar->codec_id == AV_CODEC_ID_DVVIDEO) {
avio_w8(pb, size / 4096);
avio_wb24(pb, 0);
} else
avio_wb32(pb, size);
avio_wb32(pb, field_nb);
avio_w8(pb, 1); /* flags */
avio_w8(pb, 0); /* reserved */
return 16;
}
static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
GXFContext *gxf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = s->streams[pkt->stream_index];
int64_t pos = avio_tell(pb);
int padding = 0;
unsigned packet_start_offset = avio_tell(pb) / 1024;
int ret;
gxf_write_packet_header(pb, PKT_MEDIA);
if (st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
padding = 4 - pkt->size % 4;
else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
gxf_write_media_preamble(s, pkt, pkt->size + padding);
avio_write(pb, pkt->data, pkt->size);
gxf_write_padding(pb, padding);
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (!(gxf->flt_entries_nb % 500)) {
int err;
if ((err = av_reallocp_array(&gxf->flt_entries,
gxf->flt_entries_nb + 500,
sizeof(*gxf->flt_entries))) < 0) {
gxf->flt_entries_nb = 0;
gxf->nb_fields = 0;
av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
return err;
}
}
gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
gxf->nb_fields += 2; // count fields
}
updatePacketSize(pb, pos);
gxf->packet_count++;
if (gxf->packet_count == 100) {
if ((ret = gxf_write_map_packet(s, 0)) < 0)
return ret;
gxf->packet_count = 0;
}
return 0;
}
static int gxf_compare_field_nb(AVFormatContext *s, const AVPacket *next,
const AVPacket *cur)
{
GXFContext *gxf = s->priv_data;
const AVPacket *pkt[2] = { cur, next };
int i, field_nb[2];
GXFStreamContext *sc[2];
for (i = 0; i < 2; i++) {
AVStream *st = s->streams[pkt[i]->stream_index];
sc[i] = st->priv_data;
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
(int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
field_nb[i] &= ~1; // compare against even field number because audio must be before video
} else
field_nb[i] = pkt[i]->dts; // dts are field based
}
return field_nb[1] > field_nb[0] ||
(field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
}
static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
{
int ret;
if (pkt) {
AVStream *st = s->streams[pkt->stream_index];
GXFStreamContext *sc = st->priv_data;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
pkt->pts = pkt->dts = sc->pkt_cnt * 2; // enforce 2 fields
else
pkt->pts = pkt->dts = sc->pkt_cnt * GXF_SAMPLES_PER_FRAME;
sc->pkt_cnt++;
if ((ret = ff_interleave_add_packet(s, pkt, gxf_compare_field_nb)) < 0)
return ret;
}
return ff_interleave_packet_per_dts(s, out, NULL, flush);
}
const AVOutputFormat ff_gxf_muxer = {
.name = "gxf",
.long_name = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
.extensions = "gxf",
.priv_data_size = sizeof(GXFContext),
.audio_codec = AV_CODEC_ID_PCM_S16LE,
.video_codec = AV_CODEC_ID_MPEG2VIDEO,
.write_header = gxf_write_header,
.write_packet = gxf_write_packet,
.write_trailer = gxf_write_trailer,
.deinit = gxf_deinit,
.interleave_packet = gxf_interleave_packet,
};
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