1303 lines
43 KiB
C
1303 lines
43 KiB
C
/*
|
|
* MPEG1/2 muxer
|
|
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/fifo.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "libavcodec/put_bits.h"
|
|
#include "avformat.h"
|
|
#include "mpeg.h"
|
|
|
|
#define MAX_PAYLOAD_SIZE 4096
|
|
|
|
#undef NDEBUG
|
|
#include <assert.h>
|
|
|
|
typedef struct PacketDesc {
|
|
int64_t pts;
|
|
int64_t dts;
|
|
int size;
|
|
int unwritten_size;
|
|
int flags;
|
|
struct PacketDesc *next;
|
|
} PacketDesc;
|
|
|
|
typedef struct {
|
|
AVFifoBuffer *fifo;
|
|
uint8_t id;
|
|
int max_buffer_size; /* in bytes */
|
|
int buffer_index;
|
|
PacketDesc *predecode_packet;
|
|
PacketDesc *premux_packet;
|
|
PacketDesc **next_packet;
|
|
int packet_number;
|
|
uint8_t lpcm_header[3];
|
|
int lpcm_align;
|
|
int bytes_to_iframe;
|
|
int align_iframe;
|
|
int64_t vobu_start_pts;
|
|
} StreamInfo;
|
|
|
|
typedef struct {
|
|
int packet_size; /* required packet size */
|
|
int packet_number;
|
|
int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */
|
|
int system_header_freq;
|
|
int system_header_size;
|
|
int mux_rate; /* bitrate in units of 50 bytes/s */
|
|
/* stream info */
|
|
int audio_bound;
|
|
int video_bound;
|
|
int is_mpeg2;
|
|
int is_vcd;
|
|
int is_svcd;
|
|
int is_dvd;
|
|
int64_t last_scr; /* current system clock */
|
|
|
|
double vcd_padding_bitrate; //FIXME floats
|
|
int64_t vcd_padding_bytes_written;
|
|
|
|
} MpegMuxContext;
|
|
|
|
extern AVOutputFormat ff_mpeg1vcd_muxer;
|
|
extern AVOutputFormat ff_mpeg2dvd_muxer;
|
|
extern AVOutputFormat ff_mpeg2svcd_muxer;
|
|
extern AVOutputFormat ff_mpeg2vob_muxer;
|
|
|
|
static int put_pack_header(AVFormatContext *ctx,
|
|
uint8_t *buf, int64_t timestamp)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
PutBitContext pb;
|
|
|
|
init_put_bits(&pb, buf, 128);
|
|
|
|
put_bits32(&pb, PACK_START_CODE);
|
|
if (s->is_mpeg2) {
|
|
put_bits(&pb, 2, 0x1);
|
|
} else {
|
|
put_bits(&pb, 4, 0x2);
|
|
}
|
|
put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 15, (uint32_t)((timestamp ) & 0x7fff));
|
|
put_bits(&pb, 1, 1);
|
|
if (s->is_mpeg2) {
|
|
/* clock extension */
|
|
put_bits(&pb, 9, 0);
|
|
}
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 22, s->mux_rate);
|
|
put_bits(&pb, 1, 1);
|
|
if (s->is_mpeg2) {
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 5, 0x1f); /* reserved */
|
|
put_bits(&pb, 3, 0); /* stuffing length */
|
|
}
|
|
flush_put_bits(&pb);
|
|
return put_bits_ptr(&pb) - pb.buf;
|
|
}
|
|
|
|
static int put_system_header(AVFormatContext *ctx, uint8_t *buf,int only_for_stream_id)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int size, i, private_stream_coded, id;
|
|
PutBitContext pb;
|
|
|
|
init_put_bits(&pb, buf, 128);
|
|
|
|
put_bits32(&pb, SYSTEM_HEADER_START_CODE);
|
|
put_bits(&pb, 16, 0);
|
|
put_bits(&pb, 1, 1);
|
|
|
|
put_bits(&pb, 22, s->mux_rate); /* maximum bit rate of the multiplexed stream */
|
|
put_bits(&pb, 1, 1); /* marker */
|
|
if (s->is_vcd && only_for_stream_id==VIDEO_ID) {
|
|
/* This header applies only to the video stream (see VCD standard p. IV-7)*/
|
|
put_bits(&pb, 6, 0);
|
|
} else
|
|
put_bits(&pb, 6, s->audio_bound);
|
|
|
|
if (s->is_vcd) {
|
|
/* see VCD standard, p. IV-7*/
|
|
put_bits(&pb, 1, 0);
|
|
put_bits(&pb, 1, 1);
|
|
} else {
|
|
put_bits(&pb, 1, 0); /* variable bitrate*/
|
|
put_bits(&pb, 1, 0); /* non constrainted bit stream */
|
|
}
|
|
|
|
if (s->is_vcd || s->is_dvd) {
|
|
/* see VCD standard p IV-7 */
|
|
put_bits(&pb, 1, 1); /* audio locked */
|
|
put_bits(&pb, 1, 1); /* video locked */
|
|
} else {
|
|
put_bits(&pb, 1, 0); /* audio locked */
|
|
put_bits(&pb, 1, 0); /* video locked */
|
|
}
|
|
|
|
put_bits(&pb, 1, 1); /* marker */
|
|
|
|
if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) {
|
|
/* This header applies only to the audio stream (see VCD standard p. IV-7)*/
|
|
put_bits(&pb, 5, 0);
|
|
} else
|
|
put_bits(&pb, 5, s->video_bound);
|
|
|
|
if (s->is_dvd) {
|
|
put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */
|
|
put_bits(&pb, 7, 0x7f); /* reserved byte */
|
|
} else
|
|
put_bits(&pb, 8, 0xff); /* reserved byte */
|
|
|
|
/* DVD-Video Stream_bound entries
|
|
id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1)
|
|
id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0)
|
|
id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1)
|
|
id (0xBF) private stream 2, NAV packs, set to 2x1024. */
|
|
if (s->is_dvd) {
|
|
|
|
int P_STD_max_video = 0;
|
|
int P_STD_max_mpeg_audio = 0;
|
|
int P_STD_max_mpeg_PS1 = 0;
|
|
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
StreamInfo *stream = ctx->streams[i]->priv_data;
|
|
|
|
id = stream->id;
|
|
if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) {
|
|
P_STD_max_mpeg_PS1 = stream->max_buffer_size;
|
|
} else if (id >= 0xc0 && id <= 0xc7 && stream->max_buffer_size > P_STD_max_mpeg_audio) {
|
|
P_STD_max_mpeg_audio = stream->max_buffer_size;
|
|
} else if (id == 0xe0 && stream->max_buffer_size > P_STD_max_video) {
|
|
P_STD_max_video = stream->max_buffer_size;
|
|
}
|
|
}
|
|
|
|
/* video */
|
|
put_bits(&pb, 8, 0xb9); /* stream ID */
|
|
put_bits(&pb, 2, 3);
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 13, P_STD_max_video / 1024);
|
|
|
|
/* audio */
|
|
if (P_STD_max_mpeg_audio == 0)
|
|
P_STD_max_mpeg_audio = 4096;
|
|
put_bits(&pb, 8, 0xb8); /* stream ID */
|
|
put_bits(&pb, 2, 3);
|
|
put_bits(&pb, 1, 0);
|
|
put_bits(&pb, 13, P_STD_max_mpeg_audio / 128);
|
|
|
|
/* private stream 1 */
|
|
put_bits(&pb, 8, 0xbd); /* stream ID */
|
|
put_bits(&pb, 2, 3);
|
|
put_bits(&pb, 1, 0);
|
|
put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128);
|
|
|
|
/* private stream 2 */
|
|
put_bits(&pb, 8, 0xbf); /* stream ID */
|
|
put_bits(&pb, 2, 3);
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 13, 2);
|
|
}
|
|
else {
|
|
/* audio stream info */
|
|
private_stream_coded = 0;
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
StreamInfo *stream = ctx->streams[i]->priv_data;
|
|
|
|
|
|
/* For VCDs, only include the stream info for the stream
|
|
that the pack which contains this system belongs to.
|
|
(see VCD standard p. IV-7) */
|
|
if ( !s->is_vcd || stream->id==only_for_stream_id
|
|
|| only_for_stream_id==0) {
|
|
|
|
id = stream->id;
|
|
if (id < 0xc0) {
|
|
/* special case for private streams (AC-3 uses that) */
|
|
if (private_stream_coded)
|
|
continue;
|
|
private_stream_coded = 1;
|
|
id = 0xbd;
|
|
}
|
|
put_bits(&pb, 8, id); /* stream ID */
|
|
put_bits(&pb, 2, 3);
|
|
if (id < 0xe0) {
|
|
/* audio */
|
|
put_bits(&pb, 1, 0);
|
|
put_bits(&pb, 13, stream->max_buffer_size / 128);
|
|
} else {
|
|
/* video */
|
|
put_bits(&pb, 1, 1);
|
|
put_bits(&pb, 13, stream->max_buffer_size / 1024);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
flush_put_bits(&pb);
|
|
size = put_bits_ptr(&pb) - pb.buf;
|
|
/* patch packet size */
|
|
buf[4] = (size - 6) >> 8;
|
|
buf[5] = (size - 6) & 0xff;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int get_system_header_size(AVFormatContext *ctx)
|
|
{
|
|
int buf_index, i, private_stream_coded;
|
|
StreamInfo *stream;
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
|
|
if (s->is_dvd)
|
|
return 18; // DVD-Video system headers are 18 bytes fixed length.
|
|
|
|
buf_index = 12;
|
|
private_stream_coded = 0;
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
stream = ctx->streams[i]->priv_data;
|
|
if (stream->id < 0xc0) {
|
|
if (private_stream_coded)
|
|
continue;
|
|
private_stream_coded = 1;
|
|
}
|
|
buf_index += 3;
|
|
}
|
|
return buf_index;
|
|
}
|
|
|
|
static int mpeg_mux_init(AVFormatContext *ctx)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int bitrate, i, mpa_id, mpv_id, mps_id, ac3_id, dts_id, lpcm_id, j;
|
|
AVStream *st;
|
|
StreamInfo *stream;
|
|
int audio_bitrate;
|
|
int video_bitrate;
|
|
|
|
s->packet_number = 0;
|
|
s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer);
|
|
s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer);
|
|
s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) ||
|
|
(CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) ||
|
|
(CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer));
|
|
s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer);
|
|
|
|
if(ctx->packet_size) {
|
|
if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) {
|
|
av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n",
|
|
ctx->packet_size);
|
|
goto fail;
|
|
}
|
|
s->packet_size = ctx->packet_size;
|
|
} else
|
|
s->packet_size = 2048;
|
|
|
|
s->vcd_padding_bytes_written = 0;
|
|
s->vcd_padding_bitrate=0;
|
|
|
|
s->audio_bound = 0;
|
|
s->video_bound = 0;
|
|
mpa_id = AUDIO_ID;
|
|
ac3_id = AC3_ID;
|
|
dts_id = DTS_ID;
|
|
mpv_id = VIDEO_ID;
|
|
mps_id = SUB_ID;
|
|
lpcm_id = LPCM_ID;
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
st = ctx->streams[i];
|
|
stream = av_mallocz(sizeof(StreamInfo));
|
|
if (!stream)
|
|
goto fail;
|
|
st->priv_data = stream;
|
|
|
|
av_set_pts_info(st, 64, 1, 90000);
|
|
|
|
switch(st->codec->codec_type) {
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
if (st->codec->codec_id == CODEC_ID_AC3) {
|
|
stream->id = ac3_id++;
|
|
} else if (st->codec->codec_id == CODEC_ID_DTS) {
|
|
stream->id = dts_id++;
|
|
} else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
|
|
stream->id = lpcm_id++;
|
|
for(j = 0; j < 4; j++) {
|
|
if (lpcm_freq_tab[j] == st->codec->sample_rate)
|
|
break;
|
|
}
|
|
if (j == 4)
|
|
goto fail;
|
|
if (st->codec->channels > 8)
|
|
return -1;
|
|
stream->lpcm_header[0] = 0x0c;
|
|
stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4);
|
|
stream->lpcm_header[2] = 0x80;
|
|
stream->lpcm_align = st->codec->channels * 2;
|
|
} else {
|
|
stream->id = mpa_id++;
|
|
}
|
|
|
|
/* This value HAS to be used for VCD (see VCD standard, p. IV-7).
|
|
Right now it is also used for everything else.*/
|
|
stream->max_buffer_size = 4 * 1024;
|
|
s->audio_bound++;
|
|
break;
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
stream->id = mpv_id++;
|
|
if (st->codec->rc_buffer_size)
|
|
stream->max_buffer_size = 6*1024 + st->codec->rc_buffer_size/8;
|
|
else {
|
|
av_log(ctx, AV_LOG_WARNING, "VBV buffer size not set, muxing may fail\n");
|
|
stream->max_buffer_size = 230*1024; //FIXME this is probably too small as default
|
|
}
|
|
#if 0
|
|
/* see VCD standard, p. IV-7*/
|
|
stream->max_buffer_size = 46 * 1024;
|
|
else
|
|
/* This value HAS to be used for SVCD (see SVCD standard, p. 26 V.2.3.2).
|
|
Right now it is also used for everything else.*/
|
|
stream->max_buffer_size = 230 * 1024;
|
|
#endif
|
|
s->video_bound++;
|
|
break;
|
|
case AVMEDIA_TYPE_SUBTITLE:
|
|
stream->id = mps_id++;
|
|
stream->max_buffer_size = 16 * 1024;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
stream->fifo= av_fifo_alloc(16);
|
|
if (!stream->fifo)
|
|
goto fail;
|
|
}
|
|
bitrate = 0;
|
|
audio_bitrate = 0;
|
|
video_bitrate = 0;
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
int codec_rate;
|
|
st = ctx->streams[i];
|
|
stream = (StreamInfo*) st->priv_data;
|
|
|
|
if(st->codec->rc_max_rate || stream->id==VIDEO_ID)
|
|
codec_rate= st->codec->rc_max_rate;
|
|
else
|
|
codec_rate= st->codec->bit_rate;
|
|
|
|
if(!codec_rate)
|
|
codec_rate= (1<<21)*8*50/ctx->nb_streams;
|
|
|
|
bitrate += codec_rate;
|
|
|
|
if ((stream->id & 0xe0) == AUDIO_ID)
|
|
audio_bitrate += codec_rate;
|
|
else if (stream->id==VIDEO_ID)
|
|
video_bitrate += codec_rate;
|
|
}
|
|
|
|
if(ctx->mux_rate){
|
|
s->mux_rate= (ctx->mux_rate + (8 * 50) - 1) / (8 * 50);
|
|
} else {
|
|
/* we increase slightly the bitrate to take into account the
|
|
headers. XXX: compute it exactly */
|
|
bitrate += bitrate*5/100;
|
|
bitrate += 10000;
|
|
s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
|
|
}
|
|
|
|
if (s->is_vcd) {
|
|
double overhead_rate;
|
|
|
|
/* The VCD standard mandates that the mux_rate field is 3528
|
|
(see standard p. IV-6).
|
|
The value is actually "wrong", i.e. if you calculate
|
|
it using the normal formula and the 75 sectors per second transfer
|
|
rate you get a different value because the real pack size is 2324,
|
|
not 2352. But the standard explicitly specifies that the mux_rate
|
|
field in the header must have this value.*/
|
|
// s->mux_rate=2352 * 75 / 50; /* = 3528*/
|
|
|
|
/* The VCD standard states that the muxed stream must be
|
|
exactly 75 packs / second (the data rate of a single speed cdrom).
|
|
Since the video bitrate (probably 1150000 bits/sec) will be below
|
|
the theoretical maximum we have to add some padding packets
|
|
to make up for the lower data rate.
|
|
(cf. VCD standard p. IV-6 )*/
|
|
|
|
/* Add the header overhead to the data rate.
|
|
2279 data bytes per audio pack, 2294 data bytes per video pack*/
|
|
overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279);
|
|
overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294);
|
|
overhead_rate *= 8;
|
|
|
|
/* Add padding so that the full bitrate is 2324*75 bytes/sec */
|
|
s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate);
|
|
}
|
|
|
|
if (s->is_vcd || s->is_mpeg2)
|
|
/* every packet */
|
|
s->pack_header_freq = 1;
|
|
else
|
|
/* every 2 seconds */
|
|
s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
|
|
|
|
/* the above seems to make pack_header_freq zero sometimes */
|
|
if (s->pack_header_freq == 0)
|
|
s->pack_header_freq = 1;
|
|
|
|
if (s->is_mpeg2)
|
|
/* every 200 packets. Need to look at the spec. */
|
|
s->system_header_freq = s->pack_header_freq * 40;
|
|
else if (s->is_vcd)
|
|
/* the standard mandates that there are only two system headers
|
|
in the whole file: one in the first packet of each stream.
|
|
(see standard p. IV-7 and IV-8) */
|
|
s->system_header_freq = 0x7fffffff;
|
|
else
|
|
s->system_header_freq = s->pack_header_freq * 5;
|
|
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
stream = ctx->streams[i]->priv_data;
|
|
stream->packet_number = 0;
|
|
}
|
|
s->system_header_size = get_system_header_size(ctx);
|
|
s->last_scr = 0;
|
|
return 0;
|
|
fail:
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
av_free(ctx->streams[i]->priv_data);
|
|
}
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp)
|
|
{
|
|
avio_w8(pb,
|
|
(id << 4) |
|
|
(((timestamp >> 30) & 0x07) << 1) |
|
|
1);
|
|
avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
|
|
avio_wb16(pb, (uint16_t)((((timestamp ) & 0x7fff) << 1) | 1));
|
|
}
|
|
|
|
|
|
/* return the number of padding bytes that should be inserted into
|
|
the multiplexed stream.*/
|
|
static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int pad_bytes = 0;
|
|
|
|
if (s->vcd_padding_bitrate > 0 && pts!=AV_NOPTS_VALUE)
|
|
{
|
|
int64_t full_pad_bytes;
|
|
|
|
full_pad_bytes = (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); //FIXME this is wrong
|
|
pad_bytes = (int) (full_pad_bytes - s->vcd_padding_bytes_written);
|
|
|
|
if (pad_bytes<0)
|
|
/* might happen if we have already padded to a later timestamp. This
|
|
can occur if another stream has already advanced further.*/
|
|
pad_bytes=0;
|
|
}
|
|
|
|
return pad_bytes;
|
|
}
|
|
|
|
|
|
#if 0 /* unused, remove? */
|
|
/* return the exact available payload size for the next packet for
|
|
stream 'stream_index'. 'pts' and 'dts' are only used to know if
|
|
timestamps are needed in the packet header. */
|
|
static int get_packet_payload_size(AVFormatContext *ctx, int stream_index,
|
|
int64_t pts, int64_t dts)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int buf_index;
|
|
StreamInfo *stream;
|
|
|
|
stream = ctx->streams[stream_index]->priv_data;
|
|
|
|
buf_index = 0;
|
|
if (((s->packet_number % s->pack_header_freq) == 0)) {
|
|
/* pack header size */
|
|
if (s->is_mpeg2)
|
|
buf_index += 14;
|
|
else
|
|
buf_index += 12;
|
|
|
|
if (s->is_vcd) {
|
|
/* there is exactly one system header for each stream in a VCD MPEG,
|
|
One in the very first video packet and one in the very first
|
|
audio packet (see VCD standard p. IV-7 and IV-8).*/
|
|
|
|
if (stream->packet_number==0)
|
|
/* The system headers refer only to the stream they occur in,
|
|
so they have a constant size.*/
|
|
buf_index += 15;
|
|
|
|
} else {
|
|
if ((s->packet_number % s->system_header_freq) == 0)
|
|
buf_index += s->system_header_size;
|
|
}
|
|
}
|
|
|
|
if ((s->is_vcd && stream->packet_number==0)
|
|
|| (s->is_svcd && s->packet_number==0))
|
|
/* the first pack of each stream contains only the pack header,
|
|
the system header and some padding (see VCD standard p. IV-6)
|
|
Add the padding size, so that the actual payload becomes 0.*/
|
|
buf_index += s->packet_size - buf_index;
|
|
else {
|
|
/* packet header size */
|
|
buf_index += 6;
|
|
if (s->is_mpeg2) {
|
|
buf_index += 3;
|
|
if (stream->packet_number==0)
|
|
buf_index += 3; /* PES extension */
|
|
buf_index += 1; /* obligatory stuffing byte */
|
|
}
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts)
|
|
buf_index += 5 + 5;
|
|
else
|
|
buf_index += 5;
|
|
|
|
} else {
|
|
if (!s->is_mpeg2)
|
|
buf_index++;
|
|
}
|
|
|
|
if (stream->id < 0xc0) {
|
|
/* AC-3/LPCM private data header */
|
|
buf_index += 4;
|
|
if (stream->id >= 0xa0) {
|
|
int n;
|
|
buf_index += 3;
|
|
/* NOTE: we round the payload size to an integer number of
|
|
LPCM samples */
|
|
n = (s->packet_size - buf_index) % stream->lpcm_align;
|
|
if (n)
|
|
buf_index += (stream->lpcm_align - n);
|
|
}
|
|
}
|
|
|
|
if (s->is_vcd && (stream->id & 0xe0) == AUDIO_ID)
|
|
/* The VCD standard demands that 20 zero bytes follow
|
|
each audio packet (see standard p. IV-8).*/
|
|
buf_index+=20;
|
|
}
|
|
return s->packet_size - buf_index;
|
|
}
|
|
#endif
|
|
|
|
/* Write an MPEG padding packet header. */
|
|
static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb,int packet_bytes)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
avio_wb32(pb, PADDING_STREAM);
|
|
avio_wb16(pb, packet_bytes - 6);
|
|
if (!s->is_mpeg2) {
|
|
avio_w8(pb, 0x0f);
|
|
packet_bytes -= 7;
|
|
} else
|
|
packet_bytes -= 6;
|
|
|
|
for(i=0;i<packet_bytes;i++)
|
|
avio_w8(pb, 0xff);
|
|
}
|
|
|
|
static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len){
|
|
int nb_frames=0;
|
|
PacketDesc *pkt_desc= stream->premux_packet;
|
|
|
|
while(len>0){
|
|
if(pkt_desc->size == pkt_desc->unwritten_size)
|
|
nb_frames++;
|
|
len -= pkt_desc->unwritten_size;
|
|
pkt_desc= pkt_desc->next;
|
|
}
|
|
|
|
return nb_frames;
|
|
}
|
|
|
|
/* flush the packet on stream stream_index */
|
|
static int flush_packet(AVFormatContext *ctx, int stream_index,
|
|
int64_t pts, int64_t dts, int64_t scr, int trailer_size)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
StreamInfo *stream = ctx->streams[stream_index]->priv_data;
|
|
uint8_t *buf_ptr;
|
|
int size, payload_size, startcode, id, stuffing_size, i, header_len;
|
|
int packet_size;
|
|
uint8_t buffer[128];
|
|
int zero_trail_bytes = 0;
|
|
int pad_packet_bytes = 0;
|
|
int pes_flags;
|
|
int general_pack = 0; /*"general" pack without data specific to one stream?*/
|
|
int nb_frames;
|
|
|
|
id = stream->id;
|
|
|
|
av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0);
|
|
|
|
buf_ptr = buffer;
|
|
|
|
if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) {
|
|
/* output pack and systems header if needed */
|
|
size = put_pack_header(ctx, buf_ptr, scr);
|
|
buf_ptr += size;
|
|
s->last_scr= scr;
|
|
|
|
if (s->is_vcd) {
|
|
/* there is exactly one system header for each stream in a VCD MPEG,
|
|
One in the very first video packet and one in the very first
|
|
audio packet (see VCD standard p. IV-7 and IV-8).*/
|
|
|
|
if (stream->packet_number==0) {
|
|
size = put_system_header(ctx, buf_ptr, id);
|
|
buf_ptr += size;
|
|
}
|
|
} else if (s->is_dvd) {
|
|
if (stream->align_iframe || s->packet_number == 0){
|
|
int PES_bytes_to_fill = s->packet_size - size - 10;
|
|
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts)
|
|
PES_bytes_to_fill -= 5 + 5;
|
|
else
|
|
PES_bytes_to_fill -= 5;
|
|
}
|
|
|
|
if (stream->bytes_to_iframe == 0 || s->packet_number == 0) {
|
|
size = put_system_header(ctx, buf_ptr, 0);
|
|
buf_ptr += size;
|
|
size = buf_ptr - buffer;
|
|
avio_write(ctx->pb, buffer, size);
|
|
|
|
avio_wb32(ctx->pb, PRIVATE_STREAM_2);
|
|
avio_wb16(ctx->pb, 0x03d4); // length
|
|
avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI
|
|
for (i = 0; i < 979; i++)
|
|
avio_w8(ctx->pb, 0x00);
|
|
|
|
avio_wb32(ctx->pb, PRIVATE_STREAM_2);
|
|
avio_wb16(ctx->pb, 0x03fa); // length
|
|
avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI
|
|
for (i = 0; i < 1017; i++)
|
|
avio_w8(ctx->pb, 0x00);
|
|
|
|
memset(buffer, 0, 128);
|
|
buf_ptr = buffer;
|
|
s->packet_number++;
|
|
stream->align_iframe = 0;
|
|
scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
|
|
size = put_pack_header(ctx, buf_ptr, scr);
|
|
s->last_scr= scr;
|
|
buf_ptr += size;
|
|
/* GOP Start */
|
|
} else if (stream->bytes_to_iframe < PES_bytes_to_fill) {
|
|
pad_packet_bytes = PES_bytes_to_fill - stream->bytes_to_iframe;
|
|
}
|
|
}
|
|
} else {
|
|
if ((s->packet_number % s->system_header_freq) == 0) {
|
|
size = put_system_header(ctx, buf_ptr, 0);
|
|
buf_ptr += size;
|
|
}
|
|
}
|
|
}
|
|
size = buf_ptr - buffer;
|
|
avio_write(ctx->pb, buffer, size);
|
|
|
|
packet_size = s->packet_size - size;
|
|
|
|
if (s->is_vcd && (id & 0xe0) == AUDIO_ID)
|
|
/* The VCD standard demands that 20 zero bytes follow
|
|
each audio pack (see standard p. IV-8).*/
|
|
zero_trail_bytes += 20;
|
|
|
|
if ((s->is_vcd && stream->packet_number==0)
|
|
|| (s->is_svcd && s->packet_number==0)) {
|
|
/* for VCD the first pack of each stream contains only the pack header,
|
|
the system header and lots of padding (see VCD standard p. IV-6).
|
|
In the case of an audio pack, 20 zero bytes are also added at
|
|
the end.*/
|
|
/* For SVCD we fill the very first pack to increase compatibility with
|
|
some DVD players. Not mandated by the standard.*/
|
|
if (s->is_svcd)
|
|
general_pack = 1; /* the system header refers to both streams and no stream data*/
|
|
pad_packet_bytes = packet_size - zero_trail_bytes;
|
|
}
|
|
|
|
packet_size -= pad_packet_bytes + zero_trail_bytes;
|
|
|
|
if (packet_size > 0) {
|
|
|
|
/* packet header size */
|
|
packet_size -= 6;
|
|
|
|
/* packet header */
|
|
if (s->is_mpeg2) {
|
|
header_len = 3;
|
|
if (stream->packet_number==0)
|
|
header_len += 3; /* PES extension */
|
|
header_len += 1; /* obligatory stuffing byte */
|
|
} else {
|
|
header_len = 0;
|
|
}
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts)
|
|
header_len += 5 + 5;
|
|
else
|
|
header_len += 5;
|
|
} else {
|
|
if (!s->is_mpeg2)
|
|
header_len++;
|
|
}
|
|
|
|
payload_size = packet_size - header_len;
|
|
if (id < 0xc0) {
|
|
startcode = PRIVATE_STREAM_1;
|
|
payload_size -= 1;
|
|
if (id >= 0x40) {
|
|
payload_size -= 3;
|
|
if (id >= 0xa0)
|
|
payload_size -= 3;
|
|
}
|
|
} else {
|
|
startcode = 0x100 + id;
|
|
}
|
|
|
|
stuffing_size = payload_size - av_fifo_size(stream->fifo);
|
|
|
|
// first byte does not fit -> reset pts/dts + stuffing
|
|
if(payload_size <= trailer_size && pts != AV_NOPTS_VALUE){
|
|
int timestamp_len=0;
|
|
if(dts != pts)
|
|
timestamp_len += 5;
|
|
if(pts != AV_NOPTS_VALUE)
|
|
timestamp_len += s->is_mpeg2 ? 5 : 4;
|
|
pts=dts= AV_NOPTS_VALUE;
|
|
header_len -= timestamp_len;
|
|
if (s->is_dvd && stream->align_iframe) {
|
|
pad_packet_bytes += timestamp_len;
|
|
packet_size -= timestamp_len;
|
|
} else {
|
|
payload_size += timestamp_len;
|
|
}
|
|
stuffing_size += timestamp_len;
|
|
if(payload_size > trailer_size)
|
|
stuffing_size += payload_size - trailer_size;
|
|
}
|
|
|
|
if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { // can't use padding, so use stuffing
|
|
packet_size += pad_packet_bytes;
|
|
payload_size += pad_packet_bytes; // undo the previous adjustment
|
|
if (stuffing_size < 0) {
|
|
stuffing_size = pad_packet_bytes;
|
|
} else {
|
|
stuffing_size += pad_packet_bytes;
|
|
}
|
|
pad_packet_bytes = 0;
|
|
}
|
|
|
|
if (stuffing_size < 0)
|
|
stuffing_size = 0;
|
|
if (stuffing_size > 16) { /*<=16 for MPEG-1, <=32 for MPEG-2*/
|
|
pad_packet_bytes += stuffing_size;
|
|
packet_size -= stuffing_size;
|
|
payload_size -= stuffing_size;
|
|
stuffing_size = 0;
|
|
}
|
|
|
|
nb_frames= get_nb_frames(ctx, stream, payload_size - stuffing_size);
|
|
|
|
avio_wb32(ctx->pb, startcode);
|
|
|
|
avio_wb16(ctx->pb, packet_size);
|
|
|
|
if (!s->is_mpeg2)
|
|
for(i=0;i<stuffing_size;i++)
|
|
avio_w8(ctx->pb, 0xff);
|
|
|
|
if (s->is_mpeg2) {
|
|
avio_w8(ctx->pb, 0x80); /* mpeg2 id */
|
|
|
|
pes_flags=0;
|
|
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
pes_flags |= 0x80;
|
|
if (dts != pts)
|
|
pes_flags |= 0x40;
|
|
}
|
|
|
|
/* Both the MPEG-2 and the SVCD standards demand that the
|
|
P-STD_buffer_size field be included in the first packet of
|
|
every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2
|
|
and MPEG-2 standard 2.7.7) */
|
|
if (stream->packet_number == 0)
|
|
pes_flags |= 0x01;
|
|
|
|
avio_w8(ctx->pb, pes_flags); /* flags */
|
|
avio_w8(ctx->pb, header_len - 3 + stuffing_size);
|
|
|
|
if (pes_flags & 0x80) /*write pts*/
|
|
put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts);
|
|
if (pes_flags & 0x40) /*write dts*/
|
|
put_timestamp(ctx->pb, 0x01, dts);
|
|
|
|
if (pes_flags & 0x01) { /*write pes extension*/
|
|
avio_w8(ctx->pb, 0x10); /* flags */
|
|
|
|
/* P-STD buffer info */
|
|
if ((id & 0xe0) == AUDIO_ID)
|
|
avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size/ 128);
|
|
else
|
|
avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size/1024);
|
|
}
|
|
|
|
} else {
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
if (dts != pts) {
|
|
put_timestamp(ctx->pb, 0x03, pts);
|
|
put_timestamp(ctx->pb, 0x01, dts);
|
|
} else {
|
|
put_timestamp(ctx->pb, 0x02, pts);
|
|
}
|
|
} else {
|
|
avio_w8(ctx->pb, 0x0f);
|
|
}
|
|
}
|
|
|
|
if (s->is_mpeg2) {
|
|
/* special stuffing byte that is always written
|
|
to prevent accidental generation of start codes. */
|
|
avio_w8(ctx->pb, 0xff);
|
|
|
|
for(i=0;i<stuffing_size;i++)
|
|
avio_w8(ctx->pb, 0xff);
|
|
}
|
|
|
|
if (startcode == PRIVATE_STREAM_1) {
|
|
avio_w8(ctx->pb, id);
|
|
if (id >= 0xa0) {
|
|
/* LPCM (XXX: check nb_frames) */
|
|
avio_w8(ctx->pb, 7);
|
|
avio_wb16(ctx->pb, 4); /* skip 3 header bytes */
|
|
avio_w8(ctx->pb, stream->lpcm_header[0]);
|
|
avio_w8(ctx->pb, stream->lpcm_header[1]);
|
|
avio_w8(ctx->pb, stream->lpcm_header[2]);
|
|
} else if (id >= 0x40) {
|
|
/* AC-3 */
|
|
avio_w8(ctx->pb, nb_frames);
|
|
avio_wb16(ctx->pb, trailer_size+1);
|
|
}
|
|
}
|
|
|
|
/* output data */
|
|
assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo));
|
|
av_fifo_generic_read(stream->fifo, ctx->pb, payload_size - stuffing_size, &avio_write);
|
|
stream->bytes_to_iframe -= payload_size - stuffing_size;
|
|
}else{
|
|
payload_size=
|
|
stuffing_size= 0;
|
|
}
|
|
|
|
if (pad_packet_bytes > 0)
|
|
put_padding_packet(ctx,ctx->pb, pad_packet_bytes);
|
|
|
|
for(i=0;i<zero_trail_bytes;i++)
|
|
avio_w8(ctx->pb, 0x00);
|
|
|
|
avio_flush(ctx->pb);
|
|
|
|
s->packet_number++;
|
|
|
|
/* only increase the stream packet number if this pack actually contains
|
|
something that is specific to this stream! I.e. a dedicated header
|
|
or some data.*/
|
|
if (!general_pack)
|
|
stream->packet_number++;
|
|
|
|
return payload_size - stuffing_size;
|
|
}
|
|
|
|
static void put_vcd_padding_sector(AVFormatContext *ctx)
|
|
{
|
|
/* There are two ways to do this padding: writing a sector/pack
|
|
of 0 values, or writing an MPEG padding pack. Both seem to
|
|
work with most decoders, BUT the VCD standard only allows a 0-sector
|
|
(see standard p. IV-4, IV-5).
|
|
So a 0-sector it is...*/
|
|
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
for(i=0;i<s->packet_size;i++)
|
|
avio_w8(ctx->pb, 0);
|
|
|
|
s->vcd_padding_bytes_written += s->packet_size;
|
|
|
|
avio_flush(ctx->pb);
|
|
|
|
/* increasing the packet number is correct. The SCR of the following packs
|
|
is calculated from the packet_number and it has to include the padding
|
|
sector (it represents the sector index, not the MPEG pack index)
|
|
(see VCD standard p. IV-6)*/
|
|
s->packet_number++;
|
|
}
|
|
|
|
#if 0 /* unused, remove? */
|
|
static int64_t get_vcd_scr(AVFormatContext *ctx,int stream_index,int64_t pts)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int64_t scr;
|
|
|
|
/* Since the data delivery rate is constant, SCR is computed
|
|
using the formula C + i * 1200 where C is the start constant
|
|
and i is the pack index.
|
|
It is recommended that SCR 0 is at the beginning of the VCD front
|
|
margin (a sequence of empty Form 2 sectors on the CD).
|
|
It is recommended that the front margin is 30 sectors long, so
|
|
we use C = 30*1200 = 36000
|
|
(Note that even if the front margin is not 30 sectors the file
|
|
will still be correct according to the standard. It just won't have
|
|
the "recommended" value).*/
|
|
scr = 36000 + s->packet_number * 1200;
|
|
|
|
return scr;
|
|
}
|
|
#endif
|
|
|
|
static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr){
|
|
// MpegMuxContext *s = ctx->priv_data;
|
|
int i;
|
|
|
|
for(i=0; i<ctx->nb_streams; i++){
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
PacketDesc *pkt_desc;
|
|
|
|
while((pkt_desc= stream->predecode_packet)
|
|
&& scr > pkt_desc->dts){ //FIXME > vs >=
|
|
if(stream->buffer_index < pkt_desc->size ||
|
|
stream->predecode_packet == stream->premux_packet){
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"buffer underflow i=%d bufi=%d size=%d\n",
|
|
i, stream->buffer_index, pkt_desc->size);
|
|
break;
|
|
}
|
|
stream->buffer_index -= pkt_desc->size;
|
|
|
|
stream->predecode_packet= pkt_desc->next;
|
|
av_freep(&pkt_desc);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int output_packet(AVFormatContext *ctx, int flush){
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
AVStream *st;
|
|
StreamInfo *stream;
|
|
int i, avail_space=0, es_size, trailer_size;
|
|
int best_i= -1;
|
|
int best_score= INT_MIN;
|
|
int ignore_constraints=0;
|
|
int64_t scr= s->last_scr;
|
|
PacketDesc *timestamp_packet;
|
|
const int64_t max_delay= av_rescale(ctx->max_delay, 90000, AV_TIME_BASE);
|
|
|
|
retry:
|
|
for(i=0; i<ctx->nb_streams; i++){
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
const int avail_data= av_fifo_size(stream->fifo);
|
|
const int space= stream->max_buffer_size - stream->buffer_index;
|
|
int rel_space= 1024*space / stream->max_buffer_size;
|
|
PacketDesc *next_pkt= stream->premux_packet;
|
|
|
|
/* for subtitle, a single PES packet must be generated,
|
|
so we flush after every single subtitle packet */
|
|
if(s->packet_size > avail_data && !flush
|
|
&& st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE)
|
|
return 0;
|
|
if(avail_data==0)
|
|
continue;
|
|
assert(avail_data>0);
|
|
|
|
if(space < s->packet_size && !ignore_constraints)
|
|
continue;
|
|
|
|
if(next_pkt && next_pkt->dts - scr > max_delay)
|
|
continue;
|
|
|
|
if(rel_space > best_score){
|
|
best_score= rel_space;
|
|
best_i = i;
|
|
avail_space= space;
|
|
}
|
|
}
|
|
|
|
if(best_i < 0){
|
|
int64_t best_dts= INT64_MAX;
|
|
|
|
for(i=0; i<ctx->nb_streams; i++){
|
|
AVStream *st = ctx->streams[i];
|
|
StreamInfo *stream = st->priv_data;
|
|
PacketDesc *pkt_desc= stream->predecode_packet;
|
|
if(pkt_desc && pkt_desc->dts < best_dts)
|
|
best_dts= pkt_desc->dts;
|
|
}
|
|
|
|
av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n",
|
|
scr / 90000.0, best_dts / 90000.0);
|
|
if(best_dts == INT64_MAX)
|
|
return 0;
|
|
|
|
if(scr >= best_dts+1 && !ignore_constraints){
|
|
av_log(ctx, AV_LOG_ERROR, "packet too large, ignoring buffer limits to mux it\n");
|
|
ignore_constraints= 1;
|
|
}
|
|
scr= FFMAX(best_dts+1, scr);
|
|
if(remove_decoded_packets(ctx, scr) < 0)
|
|
return -1;
|
|
goto retry;
|
|
}
|
|
|
|
assert(best_i >= 0);
|
|
|
|
st = ctx->streams[best_i];
|
|
stream = st->priv_data;
|
|
|
|
assert(av_fifo_size(stream->fifo) > 0);
|
|
|
|
assert(avail_space >= s->packet_size || ignore_constraints);
|
|
|
|
timestamp_packet= stream->premux_packet;
|
|
if(timestamp_packet->unwritten_size == timestamp_packet->size){
|
|
trailer_size= 0;
|
|
}else{
|
|
trailer_size= timestamp_packet->unwritten_size;
|
|
timestamp_packet= timestamp_packet->next;
|
|
}
|
|
|
|
if(timestamp_packet){
|
|
//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f scr:%f stream:%d\n", timestamp_packet->dts/90000.0, timestamp_packet->pts/90000.0, scr/90000.0, best_i);
|
|
es_size= flush_packet(ctx, best_i, timestamp_packet->pts, timestamp_packet->dts, scr, trailer_size);
|
|
}else{
|
|
assert(av_fifo_size(stream->fifo) == trailer_size);
|
|
es_size= flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, trailer_size);
|
|
}
|
|
|
|
if (s->is_vcd) {
|
|
/* Write one or more padding sectors, if necessary, to reach
|
|
the constant overall bitrate.*/
|
|
int vcd_pad_bytes;
|
|
|
|
while((vcd_pad_bytes = get_vcd_padding_size(ctx,stream->premux_packet->pts) ) >= s->packet_size){ //FIXME pts cannot be correct here
|
|
put_vcd_padding_sector(ctx);
|
|
s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
|
|
}
|
|
}
|
|
|
|
stream->buffer_index += es_size;
|
|
s->last_scr += s->packet_size*90000LL / (s->mux_rate*50LL); //FIXME rounding and first few bytes of each packet
|
|
|
|
while(stream->premux_packet && stream->premux_packet->unwritten_size <= es_size){
|
|
es_size -= stream->premux_packet->unwritten_size;
|
|
stream->premux_packet= stream->premux_packet->next;
|
|
}
|
|
if(es_size)
|
|
stream->premux_packet->unwritten_size -= es_size;
|
|
|
|
if(remove_decoded_packets(ctx, s->last_scr) < 0)
|
|
return -1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
|
|
{
|
|
MpegMuxContext *s = ctx->priv_data;
|
|
int stream_index= pkt->stream_index;
|
|
int size= pkt->size;
|
|
uint8_t *buf= pkt->data;
|
|
AVStream *st = ctx->streams[stream_index];
|
|
StreamInfo *stream = st->priv_data;
|
|
int64_t pts, dts;
|
|
PacketDesc *pkt_desc;
|
|
const int preload= av_rescale(ctx->preload, 90000, AV_TIME_BASE);
|
|
const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (pkt->flags & AV_PKT_FLAG_KEY);
|
|
|
|
pts= pkt->pts;
|
|
dts= pkt->dts;
|
|
|
|
if(pts != AV_NOPTS_VALUE) pts += 2*preload;
|
|
if(dts != AV_NOPTS_VALUE){
|
|
if(!s->last_scr)
|
|
s->last_scr= dts + preload;
|
|
dts += 2*preload;
|
|
}
|
|
|
|
//av_log(ctx, AV_LOG_DEBUG, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", dts/90000.0, pts/90000.0, pkt->flags, pkt->stream_index, pts != AV_NOPTS_VALUE);
|
|
if (!stream->premux_packet)
|
|
stream->next_packet = &stream->premux_packet;
|
|
*stream->next_packet=
|
|
pkt_desc= av_mallocz(sizeof(PacketDesc));
|
|
pkt_desc->pts= pts;
|
|
pkt_desc->dts= dts;
|
|
pkt_desc->unwritten_size=
|
|
pkt_desc->size= size;
|
|
if(!stream->predecode_packet)
|
|
stream->predecode_packet= pkt_desc;
|
|
stream->next_packet= &pkt_desc->next;
|
|
|
|
if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0)
|
|
return -1;
|
|
|
|
if (s->is_dvd){
|
|
if (is_iframe && (s->packet_number == 0 || (pts - stream->vobu_start_pts >= 36000))) { // min VOBU length 0.4 seconds (mpucoder)
|
|
stream->bytes_to_iframe = av_fifo_size(stream->fifo);
|
|
stream->align_iframe = 1;
|
|
stream->vobu_start_pts = pts;
|
|
}
|
|
}
|
|
|
|
av_fifo_generic_write(stream->fifo, buf, size, NULL);
|
|
|
|
for(;;){
|
|
int ret= output_packet(ctx, 0);
|
|
if(ret<=0)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static int mpeg_mux_end(AVFormatContext *ctx)
|
|
{
|
|
// MpegMuxContext *s = ctx->priv_data;
|
|
StreamInfo *stream;
|
|
int i;
|
|
|
|
for(;;){
|
|
int ret= output_packet(ctx, 1);
|
|
if(ret<0)
|
|
return ret;
|
|
else if(ret==0)
|
|
break;
|
|
}
|
|
|
|
/* End header according to MPEG1 systems standard. We do not write
|
|
it as it is usually not needed by decoders and because it
|
|
complicates MPEG stream concatenation. */
|
|
//avio_wb32(ctx->pb, ISO_11172_END_CODE);
|
|
//avio_flush(ctx->pb);
|
|
|
|
for(i=0;i<ctx->nb_streams;i++) {
|
|
stream = ctx->streams[i]->priv_data;
|
|
|
|
assert(av_fifo_size(stream->fifo) == 0);
|
|
av_fifo_free(stream->fifo);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_MPEG1SYSTEM_MUXER
|
|
AVOutputFormat ff_mpeg1system_muxer = {
|
|
.name = "mpeg",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 System format"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "mpg,mpeg",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = CODEC_ID_MP2,
|
|
.video_codec = CODEC_ID_MPEG1VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
};
|
|
#endif
|
|
#if CONFIG_MPEG1VCD_MUXER
|
|
AVOutputFormat ff_mpeg1vcd_muxer = {
|
|
.name = "vcd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 System format (VCD)"),
|
|
.mime_type = "video/mpeg",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = CODEC_ID_MP2,
|
|
.video_codec = CODEC_ID_MPEG1VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
};
|
|
#endif
|
|
#if CONFIG_MPEG2VOB_MUXER
|
|
AVOutputFormat ff_mpeg2vob_muxer = {
|
|
.name = "vob",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS format (VOB)"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "vob",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = CODEC_ID_MP2,
|
|
.video_codec = CODEC_ID_MPEG2VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
};
|
|
#endif
|
|
|
|
/* Same as mpeg2vob_mux except that the pack size is 2324 */
|
|
#if CONFIG_MPEG2SVCD_MUXER
|
|
AVOutputFormat ff_mpeg2svcd_muxer = {
|
|
.name = "svcd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS format (VOB)"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "vob",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = CODEC_ID_MP2,
|
|
.video_codec = CODEC_ID_MPEG2VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
};
|
|
#endif
|
|
|
|
/* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */
|
|
#if CONFIG_MPEG2DVD_MUXER
|
|
AVOutputFormat ff_mpeg2dvd_muxer = {
|
|
.name = "dvd",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS format (DVD VOB)"),
|
|
.mime_type = "video/mpeg",
|
|
.extensions = "dvd",
|
|
.priv_data_size = sizeof(MpegMuxContext),
|
|
.audio_codec = CODEC_ID_MP2,
|
|
.video_codec = CODEC_ID_MPEG2VIDEO,
|
|
.write_header = mpeg_mux_init,
|
|
.write_packet = mpeg_mux_write_packet,
|
|
.write_trailer = mpeg_mux_end,
|
|
};
|
|
#endif
|