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ffmpeg/libavformat/gxfenc.c

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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/fifo.h"
#include "avformat.h"
#include "gxf.h"
#include "riff.h"
#define GXF_AUDIO_PACKET_SIZE 65536
typedef struct GXFStreamContext {
AVCodecContext *codec;
AVFifoBuffer audio_buffer;
uint32_t track_type;
uint32_t sample_size;
uint32_t sample_rate;
uint16_t media_type;
uint16_t media_info;
uint8_t index;
int frame_rate_index;
int lines_index;
int fields;
int iframes;
int pframes;
int bframes;
int p_per_gop;
int b_per_gop;
int first_gop_closed;
int64_t current_dts;
int dts_delay;
} GXFStreamContext;
typedef struct GXFContext {
uint32_t nb_frames;
uint32_t material_flags;
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_user_data_offset;
uint32_t umf_user_data_size;
uint32_t umf_length;
uint16_t umf_track_size;
uint16_t umf_media_size;
int audio_written;
int sample_rate;
int flags;
AVFormatContext *fc;
GXFStreamContext streams[48];
} GXFContext;
typedef struct GXF_Lines {
int height;
int index;
} GXF_Lines;
/* FIXME check if it is relevant */
static const GXF_Lines 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[] = {
{ CODEC_ID_MJPEG , 3 }, /* NTSC */
{ CODEC_ID_MJPEG , 4 }, /* PAL */
{ CODEC_ID_PCM_S24LE , 9 },
{ CODEC_ID_PCM_S16LE , 10 },
{ CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */
{ CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */
{ CODEC_ID_DVVIDEO , 13 }, /* NTSC */
{ CODEC_ID_DVVIDEO , 14 }, /* PAL */
{ CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */
{ CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */
{ CODEC_ID_AC3 , 17 },
//{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */
{ CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */
{ CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */
{ CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */
{ 0, 0 },
};
#define SERVER_PATH "/space/"
#define ES_NAME_PATTERN "ES."
static int gxf_find_lines_index(GXFStreamContext *ctx)
{
int i;
for (i = 0; i < 6; ++i) {
if (ctx->codec->height == gxf_lines_tab[i].height) {
ctx->lines_index = gxf_lines_tab[i].index;
return 0;
}
}
return -1;
}
static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)
{
for (; to_pad > 0; to_pad--) {
put_byte(pb, 0);
}
}
static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)
{
int64_t curpos;
int size;
size = url_ftell(pb) - pos;
if (size % 4) {
gxf_write_padding(pb, 4 - size % 4);
size = url_ftell(pb) - pos;
}
curpos = url_ftell(pb);
url_fseek(pb, pos + 6, SEEK_SET);
put_be32(pb, size);
url_fseek(pb, curpos, SEEK_SET);
return curpos - pos;
}
static int64_t updateSize(ByteIOContext *pb, int64_t pos)
{
int64_t curpos;
curpos = url_ftell(pb);
url_fseek(pb, pos, SEEK_SET);
put_be16(pb, curpos - pos - 2);
url_fseek(pb, curpos, SEEK_SET);
return curpos - pos;
}
static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)
{
put_be32(pb, 0); /* packet leader for synchro */
put_byte(pb, 1);
put_byte(pb, type); /* map packet */
put_be32(pb, 0); /* size */
put_be32(pb, 0); /* reserved */
put_byte(pb, 0xE1); /* trailer 1 */
put_byte(pb, 0xE2); /* trailer 2 */
}
static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
{
char buffer[1024];
int size;
if (ctx->iframes) {
ctx->p_per_gop = ctx->pframes / ctx->iframes;
if (ctx->pframes % ctx->iframes)
ctx->p_per_gop++;
if (ctx->pframes)
ctx->b_per_gop = ctx->bframes / ctx->pframes;
if (ctx->p_per_gop > 9)
ctx->p_per_gop = 9; /* ensure value won't take more than one char */
if (ctx->b_per_gop > 9)
ctx->b_per_gop = 9; /* ensure value won't take more than one char */
}
size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
"Pix 0\nCf %d\nCg %d\nSl 7\nnl16 %d\nVi 1\nf1 1\n",
(float)ctx->codec->bit_rate, ctx->p_per_gop, ctx->b_per_gop,
ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, ctx->first_gop_closed == 1,
ctx->codec->height / 16);
put_byte(pb, TRACK_MPG_AUX);
put_byte(pb, size + 1);
put_buffer(pb, (uint8_t *)buffer, size + 1);
return size + 3;
}
static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
{
/* FIXME implement that */
put_byte(pb, 0); /* fields */
put_byte(pb, 0); /* seconds */
put_byte(pb, 0); /* minutes */
put_byte(pb, 0); /* flags + hours */
/* reserved */
put_be32(pb, 0);
return 8;
}
static int gxf_write_track_description(ByteIOContext *pb, GXFStreamContext *stream)
{
int64_t pos;
/* track description section */
put_byte(pb, stream->media_type + 0x80);
put_byte(pb, stream->index + 0xC0);
pos = url_ftell(pb);
put_be16(pb, 0); /* size */
/* media file name */
put_byte(pb, TRACK_NAME);
put_byte(pb, strlen(ES_NAME_PATTERN) + 3);
put_tag(pb, ES_NAME_PATTERN);
put_be16(pb, stream->media_info);
put_byte(pb, 0);
if (stream->codec->codec_id != CODEC_ID_MPEG2VIDEO) {
/* auxiliary information */
put_byte(pb, TRACK_AUX);
put_byte(pb, 8);
if (stream->codec->codec_id == CODEC_ID_NONE)
gxf_write_timecode_auxiliary(pb, stream);
else
put_le64(pb, 0);
}
/* file system version */
put_byte(pb, TRACK_VER);
put_byte(pb, 4);
put_be32(pb, 0);
if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
gxf_write_mpeg_auxiliary(pb, stream);
/* frame rate */
put_byte(pb, TRACK_FPS);
put_byte(pb, 4);
put_be32(pb, stream->frame_rate_index);
/* lines per frame */
put_byte(pb, TRACK_LINES);
put_byte(pb, 4);
put_be32(pb, stream->lines_index);
/* fields per frame */
put_byte(pb, TRACK_FPF);
put_byte(pb, 4);
put_be32(pb, stream->fields);
return updateSize(pb, pos);
}
static int gxf_write_material_data_section(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos;
const char *filename = strrchr(ctx->fc->filename, '/');
pos = url_ftell(pb);
put_be16(pb, 0); /* size */
/* name */
if (filename)
filename++;
else
filename = ctx->fc->filename;
put_byte(pb, MAT_NAME);
put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);
put_tag(pb, SERVER_PATH);
put_tag(pb, filename);
put_byte(pb, 0);
/* first field */
put_byte(pb, MAT_FIRST_FIELD);
put_byte(pb, 4);
put_be32(pb, 0);
/* last field */
put_byte(pb, MAT_LAST_FIELD);
put_byte(pb, 4);
put_be32(pb, ctx->nb_frames);
/* reserved */
put_byte(pb, MAT_MARK_IN);
put_byte(pb, 4);
put_be32(pb, 0);
put_byte(pb, MAT_MARK_OUT);
put_byte(pb, 4);
put_be32(pb, ctx->nb_frames);
/* estimated size */
put_byte(pb, MAT_SIZE);
put_byte(pb, 4);
put_be32(pb, url_fsize(pb) / 1024);
return updateSize(pb, pos);
}
static int gxf_write_track_description_section(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos;
int i;
pos = url_ftell(pb);
put_be16(pb, 0); /* size */
for (i = 0; i < ctx->fc->nb_streams; ++i)
gxf_write_track_description(pb, &ctx->streams[i]);
return updateSize(pb, pos);
}
static int gxf_write_map_packet(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos = url_ftell(pb);
gxf_write_packet_header(pb, PKT_MAP);
/* preamble */
put_byte(pb, 0xE0); /* version */
put_byte(pb, 0xFF); /* reserved */
gxf_write_material_data_section(pb, ctx);
gxf_write_track_description_section(pb, ctx);
return updatePacketSize(pb, pos);
}
#if 0
static int gxf_write_flt_packet(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos = url_ftell(pb);
int i;
gxf_write_packet_header(pb, PKT_FLT);
put_le32(pb, 1000); /* number of fields */
put_le32(pb, 0); /* number of active flt entries */
for (i = 0; i < 1000; ++i) {
put_le32(pb, 0);
}
return updatePacketSize(pb, pos);
}
#endif
static int gxf_write_umf_material_description(ByteIOContext *pb, GXFContext *ctx)
{
put_le32(pb, ctx->flags);
put_le32(pb, ctx->nb_frames); /* length of the longest track */
put_le32(pb, ctx->nb_frames); /* length of the shortest track */
put_le32(pb, 0); /* mark in */
put_le32(pb, ctx->nb_frames); /* mark out */
put_le32(pb, 0); /* timecode mark in */
put_le32(pb, ctx->nb_frames); /* timecode mark out */
put_le64(pb, ctx->fc->timestamp); /* modification time */
put_le64(pb, ctx->fc->timestamp); /* creation time */
put_le16(pb, 0); /* reserved */
put_le16(pb, 0); /* reserved */
put_le16(pb, ctx->audio_tracks);
put_le16(pb, 0); /* timecode track count */
put_le16(pb, 0); /* reserved */
put_le16(pb, ctx->mpeg_tracks);
return 48;
}
static int gxf_write_umf_payload(ByteIOContext *pb, GXFContext *ctx)
{
put_le32(pb, ctx->umf_length); /* total length of the umf data */
put_le32(pb, 3); /* version */
put_le32(pb, ctx->fc->nb_streams);
put_le32(pb, ctx->umf_track_offset); /* umf track section offset */
put_le32(pb, ctx->umf_track_size);
put_le32(pb, ctx->fc->nb_streams);
put_le32(pb, ctx->umf_media_offset);
put_le32(pb, ctx->umf_media_size);
put_le32(pb, ctx->umf_user_data_offset); /* user data offset */
put_le32(pb, ctx->umf_user_data_size); /* user data size */
put_le32(pb, 0); /* reserved */
put_le32(pb, 0); /* reserved */
return 48;
}
static int gxf_write_umf_track_description(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos = url_ftell(pb);
int tracks[255]={0};
int i;
ctx->umf_track_offset = pos - ctx->umf_start_offset;
for (i = 0; i < ctx->fc->nb_streams; ++i) {
AVStream *st = ctx->fc->streams[i];
GXFStreamContext *sc = &ctx->streams[i];
int id = 0;
switch (st->codec->codec_id) {
case CODEC_ID_MPEG1VIDEO: id= 'L'; break;
case CODEC_ID_MPEG2VIDEO: id= 'M'; break;
case CODEC_ID_PCM_S16LE: id= 'A'; break;
case CODEC_ID_DVVIDEO: id= sc->track_type == 6 ? 'E' : 'D'; break;
case CODEC_ID_MJPEG: id= 'V'; break;
default: break;
}
sc->media_info= id << 8;
/* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
sc->media_info |= '0' + (tracks[id]++);
put_le16(pb, sc->media_info);
put_le16(pb, 1);
}
return url_ftell(pb) - pos;
}
static int gxf_write_umf_media_mpeg(ByteIOContext *pb, GXFStreamContext *stream)
{
if (stream->codec->pix_fmt == PIX_FMT_YUV422P)
put_le32(pb, 2);
else
put_le32(pb, 1); /* default to 420 */
put_le32(pb, stream->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
put_le32(pb, 1); /* I picture per GOP */
put_le32(pb, stream->p_per_gop);
put_le32(pb, stream->b_per_gop);
if (stream->codec->codec_id == CODEC_ID_MPEG2VIDEO)
put_le32(pb, 2);
else if (stream->codec->codec_id == CODEC_ID_MPEG1VIDEO)
put_le32(pb, 1);
else
put_le32(pb, 0);
put_le32(pb, 0); /* reserved */
return 32;
}
static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *track)
{
/* FIXME implement */
put_be32(pb, 0); /* drop frame flag */
put_be32(pb, 0); /* reserved */
put_be32(pb, 0); /* reserved */
put_be32(pb, 0); /* reserved */
put_be32(pb, 0); /* reserved */
put_be32(pb, 0); /* reserved */
put_be32(pb, 0); /* reserved */
put_be32(pb, 0); /* reserved */
return 32;
}
static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *track)
{
int i;
for (i = 0; i < 8; i++) {
put_be32(pb, 0);
}
return 32;
}
static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *track)
{
put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
put_le64(pb, av_dbl2int(1)); /* sound level to begin to */
put_le32(pb, 0); /* number of fields over which to ramp up sound level */
put_le32(pb, 0); /* number of fields over which to ramp down sound level */
put_le32(pb, 0); /* reserved */
put_le32(pb, 0); /* reserved */
return 32;
}
#if 0
static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *track)
{
put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */
put_be64(pb, 0); /* FIXME FLOAT max luma quant level */
put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */
put_be64(pb, 0); /* FIXME FLOAT min luma quant level */
return 32;
}
#endif
static int gxf_write_umf_media_description(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos;
int i;
pos = url_ftell(pb);
ctx->umf_media_offset = pos - ctx->umf_start_offset;
for (i = 0; i < ctx->fc->nb_streams; ++i) {
GXFStreamContext *sc = &ctx->streams[i];
char buffer[88];
int64_t startpos, curpos;
int path_size = strlen(ES_NAME_PATTERN);
memset(buffer, 0, 88);
startpos = url_ftell(pb);
put_le16(pb, 0); /* length */
put_le16(pb, sc->media_info);
put_le16(pb, 0); /* reserved */
put_le16(pb, 0); /* reserved */
put_le32(pb, ctx->nb_frames);
put_le32(pb, 0); /* attributes rw, ro */
put_le32(pb, 0); /* mark in */
put_le32(pb, ctx->nb_frames); /* mark out */
strncpy(buffer, ES_NAME_PATTERN, path_size);
put_buffer(pb, (uint8_t *)buffer, path_size);
put_be16(pb, sc->media_info);
put_buffer(pb, (uint8_t *)buffer + path_size + 2, 88 - path_size - 2);
put_le32(pb, sc->track_type);
put_le32(pb, sc->sample_rate);
put_le32(pb, sc->sample_size);
put_le32(pb, 0); /* reserved */
switch (sc->codec->codec_id) {
case CODEC_ID_MPEG2VIDEO:
gxf_write_umf_media_mpeg(pb, sc);
break;
case CODEC_ID_PCM_S16LE:
gxf_write_umf_media_audio(pb, sc);
break;
case CODEC_ID_DVVIDEO:
gxf_write_umf_media_dv(pb, sc);
break;
default:
gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
}
curpos = url_ftell(pb);
url_fseek(pb, startpos, SEEK_SET);
put_le16(pb, curpos - startpos);
url_fseek(pb, curpos, SEEK_SET);
}
return url_ftell(pb) - pos;
}
static int gxf_write_umf_user_data(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos = url_ftell(pb);
ctx->umf_user_data_offset = pos - ctx->umf_start_offset;
put_le32(pb, 20);
put_le32(pb, 0);
put_le16(pb, 0);
put_le16(pb, 0);
put_le32(pb, 0);
put_byte(pb, 0);
put_byte(pb, 0);
put_byte(pb, 0);
put_byte(pb, 0);
return 20;
}
static int gxf_write_umf_packet(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos = url_ftell(pb);
gxf_write_packet_header(pb, PKT_UMF);
/* preamble */
put_byte(pb, 3); /* first and last (only) packet */
put_be32(pb, ctx->umf_length); /* data length */
ctx->umf_start_offset = url_ftell(pb);
gxf_write_umf_payload(pb, ctx);
gxf_write_umf_material_description(pb, ctx);
ctx->umf_track_size = gxf_write_umf_track_description(pb, ctx);
ctx->umf_media_size = gxf_write_umf_media_description(pb, ctx);
ctx->umf_user_data_size = gxf_write_umf_user_data(pb, ctx);
ctx->umf_length = url_ftell(pb) - ctx->umf_start_offset;
return updatePacketSize(pb, pos);
}
#define GXF_NODELAY -5000
static int gxf_write_header(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
GXFContext *gxf = s->priv_data;
int i;
gxf->fc = s;
gxf->flags |= 0x00080000; /* material is simple clip */
for (i = 0; i < s->nb_streams; ++i) {
AVStream *st = s->streams[i];
GXFStreamContext *sc = &gxf->streams[i];
sc->codec = st->codec;
sc->index = i;
sc->media_type = codec_get_tag(gxf_media_types, sc->codec->codec_id);
if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {
av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
return -1;
}
if (st->codec->sample_rate != 48000) {
av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
return -1;
}
if (st->codec->channels != 1) {
av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
return -1;
}
sc->track_type = 2;
sc->sample_rate = st->codec->sample_rate;
av_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 */
av_fifo_init(&sc->audio_buffer, 3*GXF_AUDIO_PACKET_SIZE);
} else if (sc->codec->codec_type == CODEC_TYPE_VIDEO) {
/* FIXME check from time_base ? */
if (sc->codec->height == 480 || sc->codec->height == 512) { /* NTSC or NTSC+VBI */
sc->frame_rate_index = 5;
sc->sample_rate = 60;
gxf->flags |= 0x00000080;
} else { /* assume PAL */
sc->frame_rate_index = 6;
sc->media_type++;
sc->sample_rate = 50;
gxf->flags |= 0x00000040;
}
gxf->sample_rate = sc->sample_rate;
av_set_pts_info(st, 64, 1, st->codec->time_base.den);
sc->dts_delay = GXF_NODELAY;
if (gxf_find_lines_index(sc) < 0)
sc->lines_index = -1;
sc->sample_size = st->codec->bit_rate;
sc->fields = 2; /* interlaced */
switch (sc->codec->codec_id) {
case CODEC_ID_MPEG2VIDEO:
sc->first_gop_closed = -1;
sc->track_type = 4;
gxf->mpeg_tracks++;
gxf->flags |= 0x00008000;
break;
case CODEC_ID_DVVIDEO:
if (sc->codec->pix_fmt == PIX_FMT_YUV422P) {
sc->media_type += 2;
sc->track_type = 6;
gxf->flags |= 0x00002000;
} else {
sc->track_type = 5;
gxf->flags |= 0x00001000;
}
break;
default:
av_log(s, AV_LOG_ERROR, "video codec not supported\n");
return -1;
}
}
}
gxf_write_map_packet(pb, gxf);
//gxf_write_flt_packet(pb, gxf);
gxf_write_umf_packet(pb, gxf);
put_flush_packet(pb);
return 0;
}
static int gxf_write_eos_packet(ByteIOContext *pb, GXFContext *ctx)
{
int64_t pos = url_ftell(pb);
gxf_write_packet_header(pb, PKT_EOS);
return updatePacketSize(pb, pos);
}
static int gxf_write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
GXFContext *gxf = s->priv_data;
int64_t end;
int i;
for (i = 0; i < s->nb_streams; ++i) {
if (s->streams[i]->codec->codec_type == CODEC_TYPE_AUDIO) {
av_fifo_free(&gxf->streams[i].audio_buffer);
} else if (s->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) {
gxf->nb_frames = 2 * s->streams[i]->codec->frame_number;
}
}
gxf_write_eos_packet(pb, gxf);
end = url_ftell(pb);
url_fseek(pb, 0, SEEK_SET);
/* overwrite map and umf packets with new values */
gxf_write_map_packet(pb, gxf);
//gxf_write_flt_packet(pb, gxf);
gxf_write_umf_packet(pb, gxf);
url_fseek(pb, end, SEEK_SET);
return 0;
}
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(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size)
{
GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
int64_t dts = av_rescale_rnd(pkt->dts, ctx->sample_rate, sc->codec->time_base.den, AV_ROUND_UP);
put_byte(pb, sc->media_type);
put_byte(pb, sc->index);
put_be32(pb, dts);
if (sc->codec->codec_type == CODEC_TYPE_AUDIO) {
put_be16(pb, 0);
put_be16(pb, size / 2);
} else if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
if (frame_type == FF_I_TYPE) {
put_byte(pb, 0x0d);
sc->iframes++;
} else if (frame_type == FF_B_TYPE) {
put_byte(pb, 0x0f);
sc->bframes++;
} else {
put_byte(pb, 0x0e);
sc->pframes++;
}
put_be24(pb, size);
} else if (sc->codec->codec_id == CODEC_ID_DVVIDEO) {
put_byte(pb, size / 4096);
put_be24(pb, 0);
} else
put_be32(pb, size);
put_be32(pb, dts);
put_byte(pb, 1); /* flags */
put_byte(pb, 0); /* reserved */
return 16;
}
static int gxf_write_media_packet(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt)
{
GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
int64_t pos = url_ftell(pb);
int padding = 0;
gxf_write_packet_header(pb, PKT_MEDIA);
if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
padding = 4 - pkt->size % 4;
else if (sc->codec->codec_type == CODEC_TYPE_AUDIO)
padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
gxf_write_media_preamble(pb, ctx, pkt, pkt->size + padding);
put_buffer(pb, pkt->data, pkt->size);
gxf_write_padding(pb, padding);
return updatePacketSize(pb, pos);
}
static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
GXFContext *gxf = s->priv_data;
gxf_write_media_packet(s->pb, gxf, pkt);
put_flush_packet(s->pb);
return 0;
}
static int gxf_new_audio_packet(GXFContext *gxf, GXFStreamContext *sc, AVPacket *pkt, int flush)
{
int size = flush ? av_fifo_size(&sc->audio_buffer) : GXF_AUDIO_PACKET_SIZE;
if (!size)
return 0;
av_new_packet(pkt, size);
av_fifo_read(&sc->audio_buffer, pkt->data, size);
pkt->stream_index = sc->index;
pkt->dts = sc->current_dts;
sc->current_dts += size / 2; /* we only support 16 bit pcm mono for now */
return size;
}
static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
{
GXFContext *gxf = s->priv_data;
AVPacket new_pkt;
int i;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
GXFStreamContext *sc = &gxf->streams[i];
if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
if (pkt && pkt->stream_index == i) {
av_fifo_generic_write(&sc->audio_buffer, pkt->data, pkt->size, NULL);
pkt = NULL;
}
if (flush || av_fifo_size(&sc->audio_buffer) >= GXF_AUDIO_PACKET_SIZE) {
if (!pkt && gxf_new_audio_packet(gxf, sc, &new_pkt, flush) > 0) {
pkt = &new_pkt;
break; /* add pkt right now into list */
}
}
} else if (pkt && pkt->stream_index == i) {
if (sc->dts_delay == GXF_NODELAY) /* adjust dts if needed */
sc->dts_delay = pkt->dts;
pkt->dts -= sc->dts_delay;
}
}
return av_interleave_packet_per_dts(s, out, pkt, flush);
}
AVOutputFormat gxf_muxer = {
"gxf",
NULL_IF_CONFIG_SMALL("GXF format"),
NULL,
"gxf",
sizeof(GXFContext),
CODEC_ID_PCM_S16LE,
CODEC_ID_MPEG2VIDEO,
gxf_write_header,
gxf_write_packet,
gxf_write_trailer,
0,
NULL,
gxf_interleave_packet,
};
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