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mpegts vbr muxing, activated when muxing rate is not supplied by the 

user.

Originally committed as revision 22352 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.6
Baptiste Coudurier 16 years ago
parent
4837bb52d2
commit
7082ea56c8
3 changed files with 74 additions and 96 deletions
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  1. +45
    -67
      libavformat/mpegtsenc.c
  2. +2
    -2
      tests/ref/lavf/ts
  3. +27
    -27
      tests/ref/seek/lavf.ts.ref

+ 45
- 67
libavformat/mpegtsenc.c View File

@@ -59,7 +59,7 @@ typedef struct MpegTSWrite {
int onid;
int tsid;
uint64_t cur_pcr;
int mux_rate;
int mux_rate; ///< set to 1 when VBR
} MpegTSWrite;

/* NOTE: 4 bytes must be left at the end for the crc32 */
@@ -382,11 +382,10 @@ static int mpegts_write_header(AVFormatContext *s)
MpegTSWrite *ts = s->priv_data;
MpegTSWriteStream *ts_st;
MpegTSService *service;
AVStream *st;
AVStream *st, *pcr_st = NULL;
AVMetadataTag *title;
int i, total_bit_rate;
int i;
const char *service_name;
uint64_t sdt_size, pat_pmt_size, pos;

ts->tsid = DEFAULT_TSID;
ts->onid = DEFAULT_ONID;
@@ -410,7 +409,6 @@ static int mpegts_write_header(AVFormatContext *s)
ts->sdt.opaque = s;

/* assign pids to each stream */
total_bit_rate = 0;
for(i = 0;i < s->nb_streams; i++) {
st = s->streams[i];
ts_st = av_mallocz(sizeof(MpegTSWriteStream));
@@ -425,68 +423,22 @@ static int mpegts_write_header(AVFormatContext *s)
ts_st->cc = 15;
/* update PCR pid by using the first video stream */
if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
service->pcr_pid == 0x1fff)
service->pcr_pid == 0x1fff) {
service->pcr_pid = ts_st->pid;
if (st->codec->rc_max_rate)
total_bit_rate += st->codec->rc_max_rate;
else {
if (!st->codec->bit_rate) {
av_log(s, AV_LOG_WARNING,
"stream %d, bit rate is not set, this will cause problems\n",
st->index);
}
total_bit_rate += st->codec->bit_rate;
}
/* PES header size */
if (st->codec->codec_type == CODEC_TYPE_VIDEO ||
st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
/* 1 PES per frame
* 19 bytes of PES header
* on average a half TS-packet (184/2) of padding-overhead every PES */
total_bit_rate += (19 + 184/2)*8 / av_q2d(st->codec->time_base);
} else {
/* 1 PES per DEFAULT_PES_PAYLOAD_SIZE bytes of audio data
* 14 bytes of PES header
* on average a half TS-packet (184/2) of padding-overhead every PES */
total_bit_rate += (14 + 184/2) *
st->codec->bit_rate / DEFAULT_PES_PAYLOAD_SIZE;
pcr_st = st;
}
}

/* if no video stream, use the first stream as PCR */
if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
ts_st = s->streams[0]->priv_data;
pcr_st = s->streams[0];
ts_st = pcr_st->priv_data;
service->pcr_pid = ts_st->pid;
}

ts->mux_rate = 1; // avoid div by 0

/* write info at the start of the file, so that it will be fast to
find them */
pos = url_ftell(s->pb);
mpegts_write_sdt(s);
sdt_size = url_ftell(s->pb) - pos;
pos = url_ftell(s->pb);
mpegts_write_pat(s);
for(i = 0; i < ts->nb_services; i++) {
mpegts_write_pmt(s, ts->services[i]);
}
pat_pmt_size = url_ftell(s->pb) - pos;

if (total_bit_rate <= 8 * 1024)
total_bit_rate = 8 * 1024;

total_bit_rate +=
total_bit_rate * 4 / (TS_PACKET_SIZE-4) + /* TS header size */
1000 * 8 * sdt_size / SDT_RETRANS_TIME + /* SDT size */
1000 * 8 * pat_pmt_size / PAT_RETRANS_TIME + /* PAT+PMT size */
1000 * 8 * 8 / PCR_RETRANS_TIME; /* PCR size */

if (s->mux_rate)
ts->mux_rate = s->mux_rate;
else
ts->mux_rate = total_bit_rate;
ts->mux_rate = s->mux_rate ? s->mux_rate : 1;

if (ts->mux_rate > 1) {
service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
(TS_PACKET_SIZE * 8 * 1000);
ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
@@ -494,17 +446,38 @@ static int mpegts_write_header(AVFormatContext *s)
ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
(TS_PACKET_SIZE * 8 * 1000);

ts->cur_pcr = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
} else {
/* Arbitrary values, PAT/PMT could be written on key frames */
ts->sdt_packet_period = 200;
ts->pat_packet_period = 40;
if (pcr_st->codec->codec_type == CODEC_TYPE_AUDIO) {
if (!pcr_st->codec->frame_size) {
av_log(s, AV_LOG_WARNING, "frame size not set\n");
service->pcr_packet_period =
pcr_st->codec->sample_rate/(10*512);
} else {
service->pcr_packet_period =
pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
}
} else {
// max delta PCR 0.1s
service->pcr_packet_period =
pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
}
}

// output a PCR as soon as possible
service->pcr_packet_count = service->pcr_packet_period;
ts->pat_packet_count = ts->pat_packet_period-1;
ts->sdt_packet_count = ts->sdt_packet_period-1;

av_log(s, AV_LOG_DEBUG,
"calculated bitrate %d bps, muxrate %d bps, "
av_log(s, AV_LOG_INFO,
"muxrate %d bps, pcr every %d pkts, "
"sdt every %d, pat/pmt every %d pkts\n",
total_bit_rate, ts->mux_rate, ts->sdt_packet_period,
ts->pat_packet_period);
ts->mux_rate, service->pcr_packet_period,
ts->sdt_packet_period, ts->pat_packet_period);

// adjust pcr
ts->cur_pcr /= ts->mux_rate;

put_flush_packet(s->pb);

@@ -624,7 +597,8 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,

write_pcr = 0;
if (ts_st->pid == ts_st->service->pcr_pid) {
ts_st->service->pcr_packet_count++;
if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
ts_st->service->pcr_packet_count++;
if (ts_st->service->pcr_packet_count >=
ts_st->service->pcr_packet_period) {
ts_st->service->pcr_packet_count = 0;
@@ -632,7 +606,8 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
}
}

if (dts != AV_NOPTS_VALUE && (dts - (int64_t)ts->cur_pcr) > delay) {
if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
(dts - (int64_t)ts->cur_pcr) > delay) {
/* pcr insert gets priority over null packet insert */
if (write_pcr)
mpegts_insert_pcr_only(s, st);
@@ -653,7 +628,10 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
*q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
if (write_pcr) {
// add 11, pcr references the last byte of program clock reference base
pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;
if (ts->mux_rate > 1)
pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;
else
pcr = dts - delay;
if (dts != AV_NOPTS_VALUE && dts < pcr)
av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
*q++ = 7; /* AFC length */
@@ -790,7 +768,7 @@ static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
uint8_t *buf= pkt->data;
uint8_t *data= NULL;
MpegTSWriteStream *ts_st = st->priv_data;
const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;

if (pkt->pts != AV_NOPTS_VALUE)


+ 2
- 2
tests/ref/lavf/ts View File

@@ -1,3 +1,3 @@
29be47a2d7aa99c7840430ba313509d3 *./tests/data/lavf/lavf.ts
428452 ./tests/data/lavf/lavf.ts
e0c183639709d6e75bc553a3ed1333dd *./tests/data/lavf/lavf.ts
406644 ./tests/data/lavf/lavf.ts
./tests/data/lavf/lavf.ts CRC=0x133216c1

+ 27
- 27
tests/ref/seek/lavf.ts.ref View File

@@ -1,53 +1,53 @@
ret: 0 st: 0 flags:1 dts: 0.660000 pts: 0.700000 pos: 564 size: 24801
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801
ret: 0 st:-1 flags:0 ts:-1.000000
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:0 dts: 1.440000 pts: 1.480000 pos: 44932 size: 14502
ret: 0 st:-1 flags:1 ts: 1.894167
ret: 0 st: 0 flags:0 dts: 0.820000 pts: 0.860000 pos: 78960 size: 13388
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st: 0 flags:0 ts: 0.788333
ret: 0 st: 0 flags:0 dts: 0.740000 pts: 0.780000 pos: 47564 size: 14502
ret: 0 st: 0 flags:0 dts: 1.520000 pts: 1.560000 pos: 74260 size: 13388
ret: 0 st: 0 flags:1 ts:-0.317500
ret: 0 st: 0 flags:1 dts: 0.660000 pts: 0.700000 pos: 564 size: 24801
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801
ret: 0 st: 1 flags:0 ts: 2.576667
ret: 0 st: 0 flags:0 dts: 0.900000 pts: 0.940000 pos: 109416 size: 12781
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st: 1 flags:1 ts: 1.470833
ret: 0 st: 0 flags:0 dts: 0.780000 pts: 0.820000 pos: 64108 size: 12623
ret: 0 st: 0 flags:0 dts: 2.160000 pts: 2.200000 pos: 325240 size: 12679
ret: 0 st:-1 flags:0 ts: 0.365002
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:0 dts: 1.440000 pts: 1.480000 pos: 44932 size: 14502
ret: 0 st:-1 flags:1 ts:-0.740831
ret: 0 st: 0 flags:1 dts: 0.660000 pts: 0.700000 pos: 564 size: 24801
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801
ret: 0 st: 0 flags:0 ts: 2.153333
ret: 0 st: 0 flags:0 dts: 0.860000 pts: 0.900000 pos: 94188 size: 13086
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st: 0 flags:1 ts: 1.047500
ret: 0 st: 0 flags:0 dts: 0.740000 pts: 0.780000 pos: 47564 size: 14502
ret: 0 st: 0 flags:0 dts: 1.680000 pts: 1.720000 pos: 130096 size: 14133
ret: 0 st: 1 flags:0 ts:-0.058333
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:0 dts: 1.440000 pts: 1.480000 pos: 44932 size: 14502
ret: 0 st: 1 flags:1 ts: 2.835833
ret: 0 st: 0 flags:0 dts: 0.940000 pts: 0.980000 pos: 124080 size: 11944
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st:-1 flags:0 ts: 1.730004
ret: 0 st: 0 flags:0 dts: 0.820000 pts: 0.860000 pos: 78960 size: 13388
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st:-1 flags:1 ts: 0.624171
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801
ret: 0 st: 0 flags:0 ts:-0.481667
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:0 dts: 1.440000 pts: 1.480000 pos: 44932 size: 14502
ret: 0 st: 0 flags:1 ts: 2.412500
ret: 0 st: 0 flags:0 dts: 0.900000 pts: 0.940000 pos: 109416 size: 12781
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st: 1 flags:0 ts: 1.306667
ret: 0 st: 0 flags:0 dts: 0.780000 pts: 0.820000 pos: 64108 size: 12623
ret: 0 st: 0 flags:0 dts: 2.080000 pts: 2.120000 pos: 294032 size: 13839
ret: 0 st: 1 flags:1 ts: 0.200844
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801
ret: 0 st:-1 flags:0 ts:-0.904994
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:0 dts: 1.440000 pts: 1.480000 pos: 44932 size: 14502
ret: 0 st:-1 flags:1 ts: 1.989173
ret: 0 st: 0 flags:0 dts: 0.860000 pts: 0.900000 pos: 94188 size: 13086
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st: 0 flags:0 ts: 0.883344
ret: 0 st: 0 flags:0 dts: 0.740000 pts: 0.780000 pos: 47564 size: 14502
ret: 0 st: 0 flags:0 dts: 1.600000 pts: 1.640000 pos: 102836 size: 12781
ret: 0 st: 0 flags:1 ts:-0.222489
ret: 0 st: 0 flags:1 dts: 0.660000 pts: 0.700000 pos: 564 size: 24801
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801
ret: 0 st: 1 flags:0 ts: 2.671678
ret: 0 st: 0 flags:0 dts: 0.900000 pts: 0.940000 pos: 109416 size: 12781
ret: 0 st: 1 flags:1 dts: 2.131433 pts: 2.131433 pos: 403636 size: 209
ret: 0 st: 1 flags:1 ts: 1.565844
ret: 0 st: 0 flags:0 dts: 0.780000 pts: 0.820000 pos: 64108 size: 12623
ret: 0 st: 0 flags:0 dts: 2.240000 pts: 2.280000 pos: 350996 size: 11307
ret: 0 st:-1 flags:0 ts: 0.460008
ret: 0 st: 0 flags:0 dts: 0.700000 pts: 0.740000 pos: 28764 size: 16433
ret: 0 st: 0 flags:0 dts: 1.440000 pts: 1.480000 pos: 44932 size: 14502
ret: 0 st:-1 flags:1 ts:-0.645825
ret: 0 st: 0 flags:1 dts: 0.660000 pts: 0.700000 pos: 564 size: 24801
ret: 0 st: 0 flags:1 dts: 1.360000 pts: 1.400000 pos: 564 size: 24801

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