/* * MPEG2 transport stream (aka DVB) mux * Copyright (c) 2003 Fabrice Bellard. * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "avformat.h" #include "mpegts.h" /* write DVB SI sections */ static const uint32_t crc_table[256] = { 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 }; unsigned int mpegts_crc32(const uint8_t *data, int len) { register int i; unsigned int crc = 0xffffffff; for (i=0; i<len; i++) crc = (crc << 8) ^ crc_table[((crc >> 24) ^ *data++) & 0xff]; return crc; } /*********************************************/ /* mpegts section writer */ typedef struct MpegTSSection { int pid; int cc; void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); void *opaque; } MpegTSSection; /* NOTE: 4 bytes must be left at the end for the crc32 */ void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) { unsigned int crc; unsigned char packet[TS_PACKET_SIZE]; const unsigned char *buf_ptr; unsigned char *q; int first, b, len1, left; crc = mpegts_crc32(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; s->cc = (s->cc + 1) & 0xf; *q++ = 0x10 | s->cc; 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; } } static inline void put16(uint8_t **q_ptr, int val) { uint8_t *q; q = *q_ptr; *q++ = val >> 8; *q++ = val; *q_ptr = q; } 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 typedef struct MpegTSWriteStream { int pid; /* stream associated pid */ int cc; int payload_index; int64_t payload_pts; uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; } MpegTSWriteStream; typedef struct MpegTSService { MpegTSSection pmt; /* MPEG2 pmt table context */ int pcr_pid; int sid; /* service ID */ char *name; char *provider_name; } 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; } MpegTSWrite; 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; 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_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 */ 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; int i, total_bit_rate; ts->tsid = DEFAULT_TSID; ts->onid = DEFAULT_ONID; /* allocate a single DVB service */ service = mpegts_add_service(ts, DEFAULT_SID, DEFAULT_PROVIDER_NAME, DEFAULT_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->pid = DEFAULT_START_PID + i; ts_st->payload_pts = AV_NOPTS_VALUE; /* update PCR pid if needed */ 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 (total_bit_rate <= 8 * 1024) total_bit_rate = 8 * 1024; 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); #if 0 printf("%d %d %d\n", total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq); #endif /* write info at the start of the file, so that it will be fast to find them */ mpegts_write_sdt(s); mpegts_write_pat(s); for(i = 0; i < ts->nb_services; i++) { mpegts_write_pmt(s, ts->services[i]); } 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]); } } } /* 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) { MpegTSWriteStream *ts_st = st->priv_data; uint8_t buf[TS_PACKET_SIZE]; uint8_t *q; int val, is_start, len, ts_len, header_len; is_start = 1; while (payload_size > 0) { retransmit_si_info(s); /* 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; ts_st->cc = (ts_st->cc + 1) & 0xf; if (is_start) { /* write PES header */ *q++ = 0x00; *q++ = 0x00; *q++ = 0x01; if (st->codec.codec_type == CODEC_TYPE_VIDEO) *q++ = 0xe0; else *q++ = 0xc0; if (pts != AV_NOPTS_VALUE) header_len = 8; else header_len = 3; len = payload_size + header_len; *q++ = len >> 8; *q++ = len; *q++ = 0x80; if (pts != AV_NOPTS_VALUE) { *q++ = 0x80; /* PTS only */ *q++ = 0x05; /* header len */ val = (0x02 << 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; } else { *q++ = 0x00; *q++ = 0x00; } is_start = 0; } /* write header */ ts_len = q - buf; put_buffer(&s->pb, buf, ts_len); /* write data */ len = TS_PACKET_SIZE - ts_len; if (len > payload_size) len = payload_size; put_buffer(&s->pb, payload, len); payload += len; payload_size -= len; ts_len += len; /* stuffing */ len = TS_PACKET_SIZE - ts_len; if (len > 0) { memset(buf, 0xff, len); put_buffer(&s->pb, buf, len); } } 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; MpegTSWriteStream *ts_st = st->priv_data; int len; 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 (ts_st->payload_pts == AV_NOPTS_VALUE) ts_st->payload_pts = pkt->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_pts = AV_NOPTS_VALUE; ts_st->payload_index = 0; } } 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); } } 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); for(i = 0; i < s->nb_streams; i++) { st = s->streams[i]; av_free(st->priv_data); } return 0; } AVOutputFormat mpegts_mux = { "mpegts", "MPEG2 transport stream format", "video/x-mpegts", "ts", sizeof(MpegTSWrite), CODEC_ID_MP2, CODEC_ID_MPEG2VIDEO, mpegts_write_header, mpegts_write_packet, mpegts_write_end, };