| /* |
| * MPEG2 transport stream (aka DVB) muxer |
| * Copyright (c) 2003 Fabrice Bellard |
| * |
| * 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/bswap.h" |
| #include "libavutil/crc.h" |
| #include "libavcodec/mpegvideo.h" |
| #include "avformat.h" |
| #include "mpegts.h" |
| |
| /* write DVB SI sections */ |
| |
| /*********************************************/ |
| /* mpegts section writer */ |
| |
| typedef struct MpegTSSection { |
| int pid; |
| int cc; |
| void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); |
| void *opaque; |
| } MpegTSSection; |
| |
| typedef struct MpegTSService { |
| MpegTSSection pmt; /* MPEG2 pmt table context */ |
| int sid; /* service ID */ |
| char *name; |
| char *provider_name; |
| int pcr_pid; |
| int pcr_packet_count; |
| int pcr_packet_freq; |
| } MpegTSService; |
| |
| typedef struct MpegTSWrite { |
| MpegTSSection pat; /* MPEG2 pat table */ |
| MpegTSSection sdt; /* MPEG2 sdt table context */ |
| MpegTSService **services; |
| int sdt_packet_count; |
| int sdt_packet_freq; |
| int pat_packet_count; |
| int pat_packet_freq; |
| int nb_services; |
| int onid; |
| int tsid; |
| uint64_t cur_pcr; |
| int mux_rate; |
| } MpegTSWrite; |
| |
| /* NOTE: 4 bytes must be left at the end for the crc32 */ |
| static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) |
| { |
| MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data; |
| unsigned int crc; |
| unsigned char packet[TS_PACKET_SIZE]; |
| const unsigned char *buf_ptr; |
| unsigned char *q; |
| int first, b, len1, left; |
| |
| crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); |
| buf[len - 4] = (crc >> 24) & 0xff; |
| buf[len - 3] = (crc >> 16) & 0xff; |
| buf[len - 2] = (crc >> 8) & 0xff; |
| buf[len - 1] = (crc) & 0xff; |
| |
| /* send each packet */ |
| buf_ptr = buf; |
| while (len > 0) { |
| first = (buf == buf_ptr); |
| q = packet; |
| *q++ = 0x47; |
| b = (s->pid >> 8); |
| if (first) |
| b |= 0x40; |
| *q++ = b; |
| *q++ = s->pid; |
| *q++ = 0x10 | s->cc; |
| s->cc = (s->cc + 1) & 0xf; |
| if (first) |
| *q++ = 0; /* 0 offset */ |
| len1 = TS_PACKET_SIZE - (q - packet); |
| if (len1 > len) |
| len1 = len; |
| memcpy(q, buf_ptr, len1); |
| q += len1; |
| /* add known padding data */ |
| left = TS_PACKET_SIZE - (q - packet); |
| if (left > 0) |
| memset(q, 0xff, left); |
| |
| s->write_packet(s, packet); |
| |
| buf_ptr += len1; |
| len -= len1; |
| |
| ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; |
| } |
| } |
| |
| static inline void put16(uint8_t **q_ptr, int val) |
| { |
| uint8_t *q; |
| q = *q_ptr; |
| *q++ = val >> 8; |
| *q++ = val; |
| *q_ptr = q; |
| } |
| |
| static int mpegts_write_section1(MpegTSSection *s, int tid, int id, |
| int version, int sec_num, int last_sec_num, |
| uint8_t *buf, int len) |
| { |
| uint8_t section[1024], *q; |
| unsigned int tot_len; |
| |
| tot_len = 3 + 5 + len + 4; |
| /* check if not too big */ |
| if (tot_len > 1024) |
| return -1; |
| |
| q = section; |
| *q++ = tid; |
| put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ |
| put16(&q, id); |
| *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ |
| *q++ = sec_num; |
| *q++ = last_sec_num; |
| memcpy(q, buf, len); |
| |
| mpegts_write_section(s, section, tot_len); |
| return 0; |
| } |
| |
| /*********************************************/ |
| /* mpegts writer */ |
| |
| #define DEFAULT_PMT_START_PID 0x1000 |
| #define DEFAULT_START_PID 0x0100 |
| #define DEFAULT_PROVIDER_NAME "FFmpeg" |
| #define DEFAULT_SERVICE_NAME "Service01" |
| |
| /* default network id, transport stream and service identifiers */ |
| #define DEFAULT_ONID 0x0001 |
| #define DEFAULT_TSID 0x0001 |
| #define DEFAULT_SID 0x0001 |
| |
| /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ |
| #define DEFAULT_PES_HEADER_FREQ 16 |
| #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) |
| |
| /* we retransmit the SI info at this rate */ |
| #define SDT_RETRANS_TIME 500 |
| #define PAT_RETRANS_TIME 100 |
| #define PCR_RETRANS_TIME 20 |
| |
| typedef struct MpegTSWriteStream { |
| struct MpegTSService *service; |
| int pid; /* stream associated pid */ |
| int cc; |
| int payload_index; |
| int64_t payload_pts; |
| int64_t payload_dts; |
| uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; |
| } MpegTSWriteStream; |
| |
| static void mpegts_write_pat(AVFormatContext *s) |
| { |
| MpegTSWrite *ts = s->priv_data; |
| MpegTSService *service; |
| uint8_t data[1012], *q; |
| int i; |
| |
| q = data; |
| for(i = 0; i < ts->nb_services; i++) { |
| service = ts->services[i]; |
| put16(&q, service->sid); |
| put16(&q, 0xe000 | service->pmt.pid); |
| } |
| mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, |
| data, q - data); |
| } |
| |
| static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) |
| { |
| // MpegTSWrite *ts = s->priv_data; |
| uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; |
| int val, stream_type, i; |
| |
| q = data; |
| put16(&q, 0xe000 | service->pcr_pid); |
| |
| program_info_length_ptr = q; |
| q += 2; /* patched after */ |
| |
| /* put program info here */ |
| |
| val = 0xf000 | (q - program_info_length_ptr - 2); |
| program_info_length_ptr[0] = val >> 8; |
| program_info_length_ptr[1] = val; |
| |
| for(i = 0; i < s->nb_streams; i++) { |
| AVStream *st = s->streams[i]; |
| MpegTSWriteStream *ts_st = st->priv_data; |
| AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0); |
| switch(st->codec->codec_id) { |
| case CODEC_ID_MPEG1VIDEO: |
| case CODEC_ID_MPEG2VIDEO: |
| stream_type = STREAM_TYPE_VIDEO_MPEG2; |
| break; |
| case CODEC_ID_MPEG4: |
| stream_type = STREAM_TYPE_VIDEO_MPEG4; |
| break; |
| case CODEC_ID_H264: |
| stream_type = STREAM_TYPE_VIDEO_H264; |
| break; |
| case CODEC_ID_DIRAC: |
| stream_type = STREAM_TYPE_VIDEO_DIRAC; |
| break; |
| case CODEC_ID_MP2: |
| case CODEC_ID_MP3: |
| stream_type = STREAM_TYPE_AUDIO_MPEG1; |
| break; |
| case CODEC_ID_AAC: |
| stream_type = STREAM_TYPE_AUDIO_AAC; |
| break; |
| case CODEC_ID_AC3: |
| stream_type = STREAM_TYPE_AUDIO_AC3; |
| break; |
| default: |
| stream_type = STREAM_TYPE_PRIVATE_DATA; |
| break; |
| } |
| *q++ = stream_type; |
| put16(&q, 0xe000 | ts_st->pid); |
| desc_length_ptr = q; |
| q += 2; /* patched after */ |
| |
| /* write optional descriptors here */ |
| switch(st->codec->codec_type) { |
| case CODEC_TYPE_AUDIO: |
| if (lang && strlen(lang->value) == 3) { |
| *q++ = 0x0a; /* ISO 639 language descriptor */ |
| *q++ = 4; |
| *q++ = lang->value[0]; |
| *q++ = lang->value[1]; |
| *q++ = lang->value[2]; |
| *q++ = 0; /* undefined type */ |
| } |
| break; |
| case CODEC_TYPE_SUBTITLE: |
| { |
| const char *language; |
| language = lang && strlen(lang->value)==3 ? lang->value : "eng"; |
| *q++ = 0x59; |
| *q++ = 8; |
| *q++ = language[0]; |
| *q++ = language[1]; |
| *q++ = language[2]; |
| *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ |
| put16(&q, 1); /* page id */ |
| put16(&q, 1); /* ancillary page id */ |
| } |
| break; |
| case CODEC_TYPE_VIDEO: |
| if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { |
| *q++ = 0x05; /*MPEG-2 registration descriptor*/ |
| *q++ = 4; |
| *q++ = 'd'; |
| *q++ = 'r'; |
| *q++ = 'a'; |
| *q++ = 'c'; |
| } |
| break; |
| } |
| |
| val = 0xf000 | (q - desc_length_ptr - 2); |
| desc_length_ptr[0] = val >> 8; |
| desc_length_ptr[1] = val; |
| } |
| mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, |
| data, q - data); |
| } |
| |
| /* NOTE: str == NULL is accepted for an empty string */ |
| static void putstr8(uint8_t **q_ptr, const char *str) |
| { |
| uint8_t *q; |
| int len; |
| |
| q = *q_ptr; |
| if (!str) |
| len = 0; |
| else |
| len = strlen(str); |
| *q++ = len; |
| memcpy(q, str, len); |
| q += len; |
| *q_ptr = q; |
| } |
| |
| static void mpegts_write_sdt(AVFormatContext *s) |
| { |
| MpegTSWrite *ts = s->priv_data; |
| MpegTSService *service; |
| uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; |
| int i, running_status, free_ca_mode, val; |
| |
| q = data; |
| put16(&q, ts->onid); |
| *q++ = 0xff; |
| for(i = 0; i < ts->nb_services; i++) { |
| service = ts->services[i]; |
| put16(&q, service->sid); |
| *q++ = 0xfc | 0x00; /* currently no EIT info */ |
| desc_list_len_ptr = q; |
| q += 2; |
| running_status = 4; /* running */ |
| free_ca_mode = 0; |
| |
| /* write only one descriptor for the service name and provider */ |
| *q++ = 0x48; |
| desc_len_ptr = q; |
| q++; |
| *q++ = 0x01; /* digital television service */ |
| putstr8(&q, service->provider_name); |
| putstr8(&q, service->name); |
| desc_len_ptr[0] = q - desc_len_ptr - 1; |
| |
| /* fill descriptor length */ |
| val = (running_status << 13) | (free_ca_mode << 12) | |
| (q - desc_list_len_ptr - 2); |
| desc_list_len_ptr[0] = val >> 8; |
| desc_list_len_ptr[1] = val; |
| } |
| mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, |
| data, q - data); |
| } |
| |
| static MpegTSService *mpegts_add_service(MpegTSWrite *ts, |
| int sid, |
| const char *provider_name, |
| const char *name) |
| { |
| MpegTSService *service; |
| |
| service = av_mallocz(sizeof(MpegTSService)); |
| if (!service) |
| return NULL; |
| service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1; |
| service->sid = sid; |
| service->provider_name = av_strdup(provider_name); |
| service->name = av_strdup(name); |
| service->pcr_pid = 0x1fff; |
| dynarray_add(&ts->services, &ts->nb_services, service); |
| return service; |
| } |
| |
| static void section_write_packet(MpegTSSection *s, const uint8_t *packet) |
| { |
| AVFormatContext *ctx = s->opaque; |
| put_buffer(ctx->pb, packet, TS_PACKET_SIZE); |
| } |
| |
| static int mpegts_write_header(AVFormatContext *s) |
| { |
| MpegTSWrite *ts = s->priv_data; |
| MpegTSWriteStream *ts_st; |
| MpegTSService *service; |
| AVStream *st; |
| AVMetadataTag *title; |
| int i, total_bit_rate; |
| const char *service_name; |
| uint64_t sdt_size, pat_pmt_size, pos; |
| |
| ts->tsid = DEFAULT_TSID; |
| ts->onid = DEFAULT_ONID; |
| /* allocate a single DVB service */ |
| title = av_metadata_get(s->metadata, "title", NULL, 0); |
| service_name = title ? title->value : DEFAULT_SERVICE_NAME; |
| service = mpegts_add_service(ts, DEFAULT_SID, |
| DEFAULT_PROVIDER_NAME, service_name); |
| service->pmt.write_packet = section_write_packet; |
| service->pmt.opaque = s; |
| |
| ts->pat.pid = PAT_PID; |
| ts->pat.cc = 0; |
| ts->pat.write_packet = section_write_packet; |
| ts->pat.opaque = s; |
| |
| ts->sdt.pid = SDT_PID; |
| ts->sdt.cc = 0; |
| ts->sdt.write_packet = section_write_packet; |
| 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)); |
| if (!ts_st) |
| goto fail; |
| st->priv_data = ts_st; |
| ts_st->service = service; |
| ts_st->pid = DEFAULT_START_PID + i; |
| ts_st->payload_pts = AV_NOPTS_VALUE; |
| ts_st->payload_dts = AV_NOPTS_VALUE; |
| /* 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 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; |
| 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 |
| 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; |
| |
| total_bit_rate += |
| total_bit_rate * 25 / (8 * DEFAULT_PES_PAYLOAD_SIZE) + /* PES header size */ |
| total_bit_rate * 4 / (8 * TS_PACKET_SIZE) + /* TS header size */ |
| SDT_RETRANS_TIME * sdt_size + /* SDT size */ |
| PAT_RETRANS_TIME * pat_pmt_size + /* PAT+PMT size */ |
| PCR_RETRANS_TIME * 8; /* PCR size */ |
| |
| 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); |
| |
| if (s->mux_rate) |
| ts->mux_rate = s->mux_rate; |
| else |
| ts->mux_rate = total_bit_rate; |
| |
| // adjust pcr |
| ts->cur_pcr /= ts->mux_rate; |
| |
| put_flush_packet(s->pb); |
| |
| return 0; |
| |
| fail: |
| for(i = 0;i < s->nb_streams; i++) { |
| st = s->streams[i]; |
| av_free(st->priv_data); |
| } |
| return -1; |
| } |
| |
| /* send SDT, PAT and PMT tables regulary */ |
| static void retransmit_si_info(AVFormatContext *s) |
| { |
| MpegTSWrite *ts = s->priv_data; |
| int i; |
| |
| if (++ts->sdt_packet_count == ts->sdt_packet_freq) { |
| ts->sdt_packet_count = 0; |
| mpegts_write_sdt(s); |
| } |
| if (++ts->pat_packet_count == ts->pat_packet_freq) { |
| ts->pat_packet_count = 0; |
| mpegts_write_pat(s); |
| for(i = 0; i < ts->nb_services; i++) { |
| mpegts_write_pmt(s, ts->services[i]); |
| } |
| } |
| } |
| |
| static void write_pts(uint8_t *q, int fourbits, int64_t pts) |
| { |
| int val; |
| |
| val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; |
| *q++ = val; |
| val = (((pts >> 15) & 0x7fff) << 1) | 1; |
| *q++ = val >> 8; |
| *q++ = val; |
| val = (((pts) & 0x7fff) << 1) | 1; |
| *q++ = val >> 8; |
| *q++ = val; |
| } |
| |
| /* NOTE: pes_data contains all the PES packet */ |
| static void mpegts_write_pes(AVFormatContext *s, AVStream *st, |
| const uint8_t *payload, int payload_size, |
| int64_t pts, int64_t dts) |
| { |
| MpegTSWriteStream *ts_st = st->priv_data; |
| MpegTSWrite *ts = s->priv_data; |
| uint8_t buf[TS_PACKET_SIZE]; |
| uint8_t *q; |
| int val, is_start, len, header_len, write_pcr, private_code, flags; |
| int afc_len, stuffing_len; |
| int64_t pcr = -1; /* avoid warning */ |
| |
| is_start = 1; |
| while (payload_size > 0) { |
| retransmit_si_info(s); |
| |
| write_pcr = 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_count = 0; |
| write_pcr = 1; |
| } |
| } |
| |
| /* prepare packet header */ |
| q = buf; |
| *q++ = 0x47; |
| val = (ts_st->pid >> 8); |
| if (is_start) |
| 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; |
| 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 (dts != AV_NOPTS_VALUE && dts < pcr) |
| av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); |
| *q++ = 7; /* AFC length */ |
| *q++ = 0x10; /* flags: PCR present */ |
| *q++ = pcr >> 25; |
| *q++ = pcr >> 17; |
| *q++ = pcr >> 9; |
| *q++ = pcr >> 1; |
| *q++ = (pcr & 1) << 7; |
| *q++ = 0; |
| } |
| if (is_start) { |
| int pes_extension = 0; |
| /* write PES header */ |
| *q++ = 0x00; |
| *q++ = 0x00; |
| *q++ = 0x01; |
| private_code = 0; |
| if (st->codec->codec_type == CODEC_TYPE_VIDEO) { |
| if (st->codec->codec_id == CODEC_ID_DIRAC) { |
| *q++ = 0xfd; |
| } else |
| *q++ = 0xe0; |
| } else if (st->codec->codec_type == CODEC_TYPE_AUDIO && |
| (st->codec->codec_id == CODEC_ID_MP2 || |
| st->codec->codec_id == CODEC_ID_MP3)) { |
| *q++ = 0xc0; |
| } else { |
| *q++ = 0xbd; |
| if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) { |
| private_code = 0x20; |
| } |
| } |
| header_len = 0; |
| flags = 0; |
| if (pts != AV_NOPTS_VALUE) { |
| header_len += 5; |
| flags |= 0x80; |
| } |
| if (dts != AV_NOPTS_VALUE && dts != pts) { |
| header_len += 5; |
| flags |= 0x40; |
| } |
| if (st->codec->codec_type == CODEC_TYPE_VIDEO && |
| st->codec->codec_id == CODEC_ID_DIRAC) { |
| /* set PES_extension_flag */ |
| pes_extension = 1; |
| flags |= 0x01; |
| |
| /* |
| * One byte for PES2 extension flag + |
| * one byte for extension length + |
| * one byte for extension id |
| */ |
| header_len += 3; |
| } |
| len = payload_size + header_len + 3; |
| if (private_code != 0) |
| len++; |
| *q++ = len >> 8; |
| *q++ = len; |
| val = 0x80; |
| /* data alignment indicator is required for subtitle data */ |
| if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) |
| val |= 0x04; |
| *q++ = val; |
| *q++ = flags; |
| *q++ = header_len; |
| if (pts != AV_NOPTS_VALUE) { |
| write_pts(q, flags >> 6, pts); |
| q += 5; |
| } |
| if (dts != AV_NOPTS_VALUE && dts != pts) { |
| write_pts(q, 1, dts); |
| q += 5; |
| } |
| if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) { |
| flags = 0x01; /* set PES_extension_flag_2 */ |
| *q++ = flags; |
| *q++ = 0x80 | 0x01; /* marker bit + extension length */ |
| /* |
| * Set the stream id extension flag bit to 0 and |
| * write the extended stream id |
| */ |
| *q++ = 0x00 | 0x60; |
| } |
| if (private_code != 0) |
| *q++ = private_code; |
| is_start = 0; |
| } |
| /* header size */ |
| header_len = q - buf; |
| /* data len */ |
| len = TS_PACKET_SIZE - header_len; |
| if (len > payload_size) |
| len = payload_size; |
| stuffing_len = TS_PACKET_SIZE - header_len - len; |
| if (stuffing_len > 0) { |
| /* add stuffing with AFC */ |
| if (buf[3] & 0x20) { |
| /* stuffing already present: increase its size */ |
| afc_len = buf[4] + 1; |
| memmove(buf + 4 + afc_len + stuffing_len, |
| buf + 4 + afc_len, |
| header_len - (4 + afc_len)); |
| buf[4] += stuffing_len; |
| memset(buf + 4 + afc_len, 0xff, stuffing_len); |
| } else { |
| /* add stuffing */ |
| memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); |
| buf[3] |= 0x20; |
| buf[4] = stuffing_len - 1; |
| if (stuffing_len >= 2) { |
| buf[5] = 0x00; |
| memset(buf + 6, 0xff, stuffing_len - 2); |
| } |
| } |
| } |
| memcpy(buf + TS_PACKET_SIZE - len, payload, len); |
| payload += len; |
| payload_size -= len; |
| put_buffer(s->pb, buf, TS_PACKET_SIZE); |
| ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; |
| } |
| put_flush_packet(s->pb); |
| } |
| |
| static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVStream *st = s->streams[pkt->stream_index]; |
| int size= pkt->size; |
| uint8_t *buf= pkt->data; |
| uint8_t *data= NULL; |
| MpegTSWriteStream *ts_st = st->priv_data; |
| int len, max_payload_size; |
| 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->pts != AV_NOPTS_VALUE) |
| pts = pkt->pts + delay; |
| 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; |
| } |
| max_payload_size = DEFAULT_PES_PAYLOAD_SIZE; |
| 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 (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { |
| av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n"); |
| return -1; |
| } |
| if (pkt->data[4] != 0x09) { // AUD NAL |
| data = av_malloc(pkt->size+6); |
| if (!data) |
| return -1; |
| memcpy(data+6, pkt->data, pkt->size); |
| AV_WB32(data, 0x00000001); |
| data[4] = 0x09; |
| data[5] = 0xe0; // any slice type |
| 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; |
| } |
| |
| while (size > 0) { |
| len = max_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 >= max_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 |
| } |
| } |
| |
| av_free(data); |
| |
| return 0; |
| } |
| |
| static int mpegts_write_end(AVFormatContext *s) |
| { |
| MpegTSWrite *ts = s->priv_data; |
| MpegTSWriteStream *ts_st; |
| MpegTSService *service; |
| AVStream *st; |
| int i; |
| |
| /* flush current packets */ |
| for(i = 0; i < s->nb_streams; i++) { |
| st = s->streams[i]; |
| ts_st = st->priv_data; |
| if (ts_st->payload_index > 0) { |
| mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, |
| ts_st->payload_pts, ts_st->payload_dts); |
| } |
| } |
| put_flush_packet(s->pb); |
| |
| for(i = 0; i < ts->nb_services; i++) { |
| service = ts->services[i]; |
| av_freep(&service->provider_name); |
| av_freep(&service->name); |
| av_free(service); |
| } |
| av_free(ts->services); |
| |
| return 0; |
| } |
| |
| AVOutputFormat mpegts_muxer = { |
| "mpegts", |
| NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), |
| "video/x-mpegts", |
| "ts,m2t", |
| sizeof(MpegTSWrite), |
| CODEC_ID_MP2, |
| CODEC_ID_MPEG2VIDEO, |
| mpegts_write_header, |
| mpegts_write_packet, |
| mpegts_write_end, |
| }; |