char *provider_name;
int pcr_pid;
int pcr_packet_count;
- int pcr_packet_freq;
+ int pcr_packet_period;
} MpegTSService;
typedef struct MpegTSWrite {
MpegTSSection sdt; /* MPEG2 sdt table context */
MpegTSService **services;
int sdt_packet_count;
- int sdt_packet_freq;
+ int sdt_packet_period;
int pat_packet_count;
- int pat_packet_freq;
+ int pat_packet_period;
int nb_services;
int onid;
int tsid;
b |= 0x40;
*q++ = b;
*q++ = s->pid;
- *q++ = 0x10 | s->cc;
s->cc = (s->cc + 1) & 0xf;
+ *q++ = 0x10 | s->cc;
if (first)
*q++ = 0; /* 0 offset */
len1 = TS_PACKET_SIZE - (q - packet);
int pid; /* stream associated pid */
int cc;
int payload_index;
+ int first_pts_check; ///< first pts check needed
int64_t payload_pts;
int64_t payload_dts;
uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
service->pmt.opaque = s;
ts->pat.pid = PAT_PID;
- ts->pat.cc = 0;
+ ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
ts->pat.write_packet = section_write_packet;
ts->pat.opaque = s;
ts->sdt.pid = SDT_PID;
- ts->sdt.cc = 0;
+ ts->sdt.cc = 15;
ts->sdt.write_packet = section_write_packet;
ts->sdt.opaque = s;
ts_st->pid = DEFAULT_START_PID + i;
ts_st->payload_pts = AV_NOPTS_VALUE;
ts_st->payload_dts = AV_NOPTS_VALUE;
+ ts_st->first_pts_check = 1;
/* update PCR pid by using the first video stream */
if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
service->pcr_pid == 0x1fff)
service->pcr_pid = ts_st->pid;
- total_bit_rate += st->codec->bit_rate;
+ 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;
+ }
}
/* if no video stream, use the first stream as PCR */
service->pcr_pid = ts_st->pid;
}
- if (total_bit_rate <= 8 * 1024)
- total_bit_rate = 8 * 1024;
- service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
- (TS_PACKET_SIZE * 8 * 1000);
- ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
- (TS_PACKET_SIZE * 8 * 1000);
- ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
- (TS_PACKET_SIZE * 8 * 1000);
-
ts->mux_rate = 1; // avoid div by 0
/* write info at the start of the file, so that it will be fast to
}
pat_pmt_size = url_ftell(s->pb) - pos;
- total_bit_rate +=
- total_bit_rate * 25 / DEFAULT_PES_PAYLOAD_SIZE + /* PES header size */
- total_bit_rate * 4 / TS_PACKET_SIZE + /* TS header size */
- SDT_RETRANS_TIME * 8 * sdt_size / 1000 + /* SDT size */
- PAT_RETRANS_TIME * 8 * pat_pmt_size / 1000 + /* PAT+PMT size */
- PCR_RETRANS_TIME * 8 * 8 / 1000; /* PCR size */
+ if (total_bit_rate <= 8 * 1024)
+ total_bit_rate = 8 * 1024;
- av_log(s, AV_LOG_DEBUG, "muxrate %d freq sdt %d pat %d\n",
- total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
+ total_bit_rate +=
+ total_bit_rate * 4 / (TS_PACKET_SIZE-4) + /* TS header size */
+ 1000 * 8 * sdt_size / PAT_RETRANS_TIME + /* SDT size */
+ 1000 * 8 * pat_pmt_size / SDT_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;
+ 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) /
+ (TS_PACKET_SIZE * 8 * 1000);
+ ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
+ (TS_PACKET_SIZE * 8 * 1000);
+
+ // output a PCR as soon as possible
+ service->pcr_packet_count = service->pcr_packet_period;
+
+ av_log(s, AV_LOG_DEBUG,
+ "calculated bitrate %d bps, muxrate %d bps, "
+ "sdt every %d, pat/pmt every %d pkts\n",
+ total_bit_rate, ts->mux_rate, ts->sdt_packet_period,
+ ts->pat_packet_period);
+
// adjust pcr
ts->cur_pcr /= ts->mux_rate;
MpegTSWrite *ts = s->priv_data;
int i;
- if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
+ if (++ts->sdt_packet_count == ts->sdt_packet_period) {
ts->sdt_packet_count = 0;
mpegts_write_sdt(s);
}
- if (++ts->pat_packet_count == ts->pat_packet_freq) {
+ if (++ts->pat_packet_count == ts->pat_packet_period) {
ts->pat_packet_count = 0;
mpegts_write_pat(s);
for(i = 0; i < ts->nb_services; i++) {
}
}
+/* Write a single null transport stream packet */
+static void mpegts_insert_null_packet(AVFormatContext *s)
+{
+ MpegTSWrite *ts = s->priv_data;
+ uint8_t *q;
+ uint8_t buf[TS_PACKET_SIZE];
+
+ q = buf;
+ *q++ = 0x47;
+ *q++ = 0x00 | 0x1f;
+ *q++ = 0xff;
+ *q++ = 0x10;
+ memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
+ put_buffer(s->pb, buf, TS_PACKET_SIZE);
+ ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
+}
+
+/* Write a single transport stream packet with a PCR and no payload */
+static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
+{
+ MpegTSWrite *ts = s->priv_data;
+ MpegTSWriteStream *ts_st = st->priv_data;
+ uint8_t *q;
+ uint64_t pcr = ts->cur_pcr;
+ uint8_t buf[TS_PACKET_SIZE];
+
+ q = buf;
+ *q++ = 0x47;
+ *q++ = ts_st->pid >> 8;
+ *q++ = ts_st->pid;
+ *q++ = 0x20 | ts_st->cc; /* Adaptation only */
+ /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
+ *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
+ *q++ = 0x10; /* Adaptation flags: PCR present */
+
+ /* PCR coded into 6 bytes */
+ *q++ = pcr >> 25;
+ *q++ = pcr >> 17;
+ *q++ = pcr >> 9;
+ *q++ = pcr >> 1;
+ *q++ = (pcr & 1) << 7;
+ *q++ = 0;
+
+ /* stuffing bytes */
+ memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
+ put_buffer(s->pb, buf, TS_PACKET_SIZE);
+ ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
+}
+
static void write_pts(uint8_t *q, int fourbits, int64_t pts)
{
int val;
*q++ = val;
}
-/* NOTE: pes_data contains all the PES packet */
+/* Add a pes header to the front of payload, and segment into an integer number of
+ * ts packets. The final ts packet is padded using an over-sized adaptation header
+ * to exactly fill the last ts packet.
+ * NOTE: 'payload' contains a complete PES payload.
+ */
static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
const uint8_t *payload, int payload_size,
int64_t pts, int64_t dts)
int val, is_start, len, header_len, write_pcr, private_code, flags;
int afc_len, stuffing_len;
int64_t pcr = -1; /* avoid warning */
+ int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
is_start = 1;
while (payload_size > 0) {
if (ts_st->pid == ts_st->service->pcr_pid) {
ts_st->service->pcr_packet_count++;
if (ts_st->service->pcr_packet_count >=
- ts_st->service->pcr_packet_freq) {
+ ts_st->service->pcr_packet_period) {
ts_st->service->pcr_packet_count = 0;
write_pcr = 1;
}
}
+ if (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);
+ else
+ mpegts_insert_null_packet(s);
+ continue; /* recalculate write_pcr and possibly retransmit si_info */
+ }
+
/* prepare packet header */
q = buf;
*q++ = 0x47;
val |= 0x40;
*q++ = val;
*q++ = ts_st->pid;
- *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
ts_st->cc = (ts_st->cc + 1) & 0xf;
+ *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;
len = payload_size + header_len + 3;
if (private_code != 0)
len++;
+ if (len > 0xffff)
+ len = 0;
*q++ = len >> 8;
*q++ = len;
val = 0x80;
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
- int len, size = pkt->size;
+ int size = pkt->size;
uint8_t *buf= pkt->data;
uint8_t *data= NULL;
MpegTSWriteStream *ts_st = st->priv_data;
- const uint8_t *access_unit_index = NULL;
const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
if (pkt->dts != AV_NOPTS_VALUE)
dts = pkt->dts + delay;
- if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
- /* for subtitle, a single PES packet must be generated */
- mpegts_write_pes(s, st, buf, size, pts, AV_NOPTS_VALUE);
- return 0;
- }
-
- if (st->codec->codec_id == CODEC_ID_DIRAC) {
- /* for Dirac, a single PES packet must be generated */
- mpegts_write_pes(s, st, buf, size, pts, dts);
- return 0;
+ if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
+ av_log(s, AV_LOG_ERROR, "first pts value must set\n");
+ return -1;
}
+ ts_st->first_pts_check = 0;
- if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO ||
- st->codec->codec_id == CODEC_ID_MPEG1VIDEO) {
- const uint8_t *p = pkt->data;
- const uint8_t *end = pkt->data+pkt->size;
- uint32_t state = -1;
- while (p < end) {
- p = ff_find_start_code(p, end, &state);
- if (state == PICTURE_START_CODE) {
- access_unit_index = p - 4;
- break;
- }
- }
- } if (st->codec->codec_id == CODEC_ID_H264) {
+ if (st->codec->codec_id == CODEC_ID_H264) {
if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n");
return -1;
buf = data;
size = pkt->size+6;
}
- access_unit_index = buf;
- } else {
- access_unit_index = pkt->data;
}
- if (!access_unit_index) {
- av_log(s, AV_LOG_ERROR, "error, could not find access unit start\n");
- return -1;
+ if (st->codec->codec_type != CODEC_TYPE_AUDIO) {
+ // for video and subtitle, write a single pes packet
+ mpegts_write_pes(s, st, buf, size, pts, dts);
+ av_free(data);
+ return 0;
}
- while (size > 0) {
- len = DEFAULT_PES_PAYLOAD_SIZE - ts_st->payload_index;
- if (len > size)
- len = size;
- memcpy(ts_st->payload + ts_st->payload_index, buf, len);
- buf += len;
- size -= len;
- ts_st->payload_index += len;
- if (access_unit_index && access_unit_index < buf &&
- ts_st->payload_pts == AV_NOPTS_VALUE &&
- ts_st->payload_dts == AV_NOPTS_VALUE) {
- ts_st->payload_dts = dts;
- ts_st->payload_pts = pts;
- }
- if (ts_st->payload_index >= DEFAULT_PES_PAYLOAD_SIZE) {
- mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
- ts_st->payload_pts, ts_st->payload_dts);
- ts_st->payload_pts = AV_NOPTS_VALUE;
- ts_st->payload_dts = AV_NOPTS_VALUE;
- ts_st->payload_index = 0;
- access_unit_index = NULL; // unset access unit to avoid setting pts/dts again
- }
+ if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
+ mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
+ ts_st->payload_pts, ts_st->payload_dts);
+ ts_st->payload_index = 0;
+ }
+
+ if (!ts_st->payload_index) {
+ ts_st->payload_pts = pts;
+ ts_st->payload_dts = dts;
}
- av_free(data);
+ memcpy(ts_st->payload + ts_st->payload_index, buf, size);
+ ts_st->payload_index += size;
return 0;
}
projects / ffmpeg / blobdiff