FFmpeg: libavformat/mpegtsenc.c Source File

00001 /*
00002  * MPEG2 transport stream (aka DVB) muxer
00003  * Copyright (c) 2003 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/bswap.h"
00023 #include "libavutil/crc.h"
00024 #include "libavutil/dict.h"
00025 #include "libavutil/mathematics.h"
00026 #include "libavutil/opt.h"
00027 #include "libavutil/avassert.h"
00028 #include "libavcodec/mpegvideo.h"
00029 #include "avformat.h"
00030 #include "internal.h"
00031 #include "mpegts.h"
00032 
00033 #define PCR_TIME_BASE 27000000
00034 
00035 /* write DVB SI sections */
00036 
00037 /*********************************************/
00038 /* mpegts section writer */
00039 
00040 typedef struct MpegTSSection {
00041     int pid;
00042     int cc;
00043     void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
00044     void *opaque;
00045 } MpegTSSection;
00046 
00047 typedef struct MpegTSService {
00048     MpegTSSection pmt; /* MPEG2 pmt table context */
00049     int sid;           /* service ID */
00050     char *name;
00051     char *provider_name;
00052     int pcr_pid;
00053     int pcr_packet_count;
00054     int pcr_packet_period;
00055 } MpegTSService;
00056 
00057 typedef struct MpegTSWrite {
00058     const AVClass *av_class;
00059     MpegTSSection pat; /* MPEG2 pat table */
00060     MpegTSSection sdt; /* MPEG2 sdt table context */
00061     MpegTSService **services;
00062     int sdt_packet_count;
00063     int sdt_packet_period;
00064     int pat_packet_count;
00065     int pat_packet_period;
00066     int nb_services;
00067     int onid;
00068     int tsid;
00069     int64_t first_pcr;
00070     int mux_rate; 
00071     int pes_payload_size;
00072 
00073     int transport_stream_id;
00074     int original_network_id;
00075     int service_id;
00076 
00077     int pmt_start_pid;
00078     int start_pid;
00079     int m2ts_mode;
00080 
00081     int reemit_pat_pmt; // backward compatibility
00082 
00083 #define MPEGTS_FLAG_REEMIT_PAT_PMT  0x01
00084 #define MPEGTS_FLAG_AAC_LATM        0x02
00085     int flags;
00086     int copyts;
00087 } MpegTSWrite;
00088 
00089 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
00090 #define DEFAULT_PES_HEADER_FREQ 16
00091 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
00092 
00093 static const AVOption options[] = {
00094     { "mpegts_transport_stream_id", "Set transport_stream_id field.",
00095       offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
00096     { "mpegts_original_network_id", "Set original_network_id field.",
00097       offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
00098     { "mpegts_service_id", "Set service_id field.",
00099       offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
00100     { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
00101       offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
00102     { "mpegts_start_pid", "Set the first pid.",
00103       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
00104     {"mpegts_m2ts_mode", "Enable m2ts mode.",
00105         offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },
00106         -1,1, AV_OPT_FLAG_ENCODING_PARAM},
00107     { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
00108     { "pes_payload_size", "Minimum PES packet payload in bytes",
00109       offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
00110     { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
00111       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
00112     { "resend_headers", "Reemit PAT/PMT before writing the next packet",
00113       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
00114       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
00115     { "latm", "Use LATM packetization for AAC",
00116       0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
00117       AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
00118     // backward compatibility
00119     { "resend_headers", "Reemit PAT/PMT before writing the next packet",
00120       offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
00121     { "mpegts_copyts", "dont offset dts/pts",
00122       offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
00123     { NULL },
00124 };
00125 
00126 static const AVClass mpegts_muxer_class = {
00127     .class_name     = "MPEGTS muxer",
00128     .item_name      = av_default_item_name,
00129     .option         = options,
00130     .version        = LIBAVUTIL_VERSION_INT,
00131 };
00132 
00133 /* NOTE: 4 bytes must be left at the end for the crc32 */
00134 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
00135 {
00136     unsigned int crc;
00137     unsigned char packet[TS_PACKET_SIZE];
00138     const unsigned char *buf_ptr;
00139     unsigned char *q;
00140     int first, b, len1, left;
00141 
00142     crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
00143     buf[len - 4] = (crc >> 24) & 0xff;
00144     buf[len - 3] = (crc >> 16) & 0xff;
00145     buf[len - 2] = (crc >> 8) & 0xff;
00146     buf[len - 1] = (crc) & 0xff;
00147 
00148     /* send each packet */
00149     buf_ptr = buf;
00150     while (len > 0) {
00151         first = (buf == buf_ptr);
00152         q = packet;
00153         *q++ = 0x47;
00154         b = (s->pid >> 8);
00155         if (first)
00156             b |= 0x40;
00157         *q++ = b;
00158         *q++ = s->pid;
00159         s->cc = (s->cc + 1) & 0xf;
00160         *q++ = 0x10 | s->cc;
00161         if (first)
00162             *q++ = 0; /* 0 offset */
00163         len1 = TS_PACKET_SIZE - (q - packet);
00164         if (len1 > len)
00165             len1 = len;
00166         memcpy(q, buf_ptr, len1);
00167         q += len1;
00168         /* add known padding data */
00169         left = TS_PACKET_SIZE - (q - packet);
00170         if (left > 0)
00171             memset(q, 0xff, left);
00172 
00173         s->write_packet(s, packet);
00174 
00175         buf_ptr += len1;
00176         len -= len1;
00177     }
00178 }
00179 
00180 static inline void put16(uint8_t **q_ptr, int val)
00181 {
00182     uint8_t *q;
00183     q = *q_ptr;
00184     *q++ = val >> 8;
00185     *q++ = val;
00186     *q_ptr = q;
00187 }
00188 
00189 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
00190                           int version, int sec_num, int last_sec_num,
00191                           uint8_t *buf, int len)
00192 {
00193     uint8_t section[1024], *q;
00194     unsigned int tot_len;
00195     /* reserved_future_use field must be set to 1 for SDT */
00196     unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
00197 
00198     tot_len = 3 + 5 + len + 4;
00199     /* check if not too big */
00200     if (tot_len > 1024)
00201         return AVERROR_INVALIDDATA;
00202 
00203     q = section;
00204     *q++ = tid;
00205     put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
00206     put16(&q, id);
00207     *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
00208     *q++ = sec_num;
00209     *q++ = last_sec_num;
00210     memcpy(q, buf, len);
00211 
00212     mpegts_write_section(s, section, tot_len);
00213     return 0;
00214 }
00215 
00216 /*********************************************/
00217 /* mpegts writer */
00218 
00219 #define DEFAULT_PROVIDER_NAME   "FFmpeg"
00220 #define DEFAULT_SERVICE_NAME    "Service01"
00221 
00222 /* we retransmit the SI info at this rate */
00223 #define SDT_RETRANS_TIME 500
00224 #define PAT_RETRANS_TIME 100
00225 #define PCR_RETRANS_TIME 20
00226 
00227 typedef struct MpegTSWriteStream {
00228     struct MpegTSService *service;
00229     int pid; /* stream associated pid */
00230     int cc;
00231     int payload_size;
00232     int first_pts_check; 
00233     int prev_payload_key;
00234     int64_t payload_pts;
00235     int64_t payload_dts;
00236     int payload_flags;
00237     uint8_t *payload;
00238     AVFormatContext *amux;
00239 } MpegTSWriteStream;
00240 
00241 static void mpegts_write_pat(AVFormatContext *s)
00242 {
00243     MpegTSWrite *ts = s->priv_data;
00244     MpegTSService *service;
00245     uint8_t data[1012], *q;
00246     int i;
00247 
00248     q = data;
00249     for(i = 0; i < ts->nb_services; i++) {
00250         service = ts->services[i];
00251         put16(&q, service->sid);
00252         put16(&q, 0xe000 | service->pmt.pid);
00253     }
00254     mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
00255                           data, q - data);
00256 }
00257 
00258 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
00259 {
00260     MpegTSWrite *ts = s->priv_data;
00261     uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
00262     int val, stream_type, i;
00263 
00264     q = data;
00265     put16(&q, 0xe000 | service->pcr_pid);
00266 
00267     program_info_length_ptr = q;
00268     q += 2; /* patched after */
00269 
00270     /* put program info here */
00271 
00272     val = 0xf000 | (q - program_info_length_ptr - 2);
00273     program_info_length_ptr[0] = val >> 8;
00274     program_info_length_ptr[1] = val;
00275 
00276     for(i = 0; i < s->nb_streams; i++) {
00277         AVStream *st = s->streams[i];
00278         MpegTSWriteStream *ts_st = st->priv_data;
00279         AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
00280         switch(st->codec->codec_id) {
00281         case AV_CODEC_ID_MPEG1VIDEO:
00282         case AV_CODEC_ID_MPEG2VIDEO:
00283             stream_type = STREAM_TYPE_VIDEO_MPEG2;
00284             break;
00285         case AV_CODEC_ID_MPEG4:
00286             stream_type = STREAM_TYPE_VIDEO_MPEG4;
00287             break;
00288         case AV_CODEC_ID_H264:
00289             stream_type = STREAM_TYPE_VIDEO_H264;
00290             break;
00291         case AV_CODEC_ID_DIRAC:
00292             stream_type = STREAM_TYPE_VIDEO_DIRAC;
00293             break;
00294         case AV_CODEC_ID_MP2:
00295         case AV_CODEC_ID_MP3:
00296             stream_type = STREAM_TYPE_AUDIO_MPEG1;
00297             break;
00298         case AV_CODEC_ID_AAC:
00299             stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
00300             break;
00301         case AV_CODEC_ID_AAC_LATM:
00302             stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
00303             break;
00304         case AV_CODEC_ID_AC3:
00305             stream_type = STREAM_TYPE_AUDIO_AC3;
00306             break;
00307         default:
00308             stream_type = STREAM_TYPE_PRIVATE_DATA;
00309             break;
00310         }
00311         *q++ = stream_type;
00312         put16(&q, 0xe000 | ts_st->pid);
00313         desc_length_ptr = q;
00314         q += 2; /* patched after */
00315 
00316         /* write optional descriptors here */
00317         switch(st->codec->codec_type) {
00318         case AVMEDIA_TYPE_AUDIO:
00319             if(st->codec->codec_id==AV_CODEC_ID_EAC3){
00320                 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
00321                 *q++=1; // 1 byte, all flags sets to 0
00322                 *q++=0; // omit all fields...
00323             }
00324             if(st->codec->codec_id==AV_CODEC_ID_S302M){
00325                 *q++ = 0x05; /* MPEG-2 registration descriptor*/
00326                 *q++ = 4;
00327                 *q++ = 'B';
00328                 *q++ = 'S';
00329                 *q++ = 'S';
00330                 *q++ = 'D';
00331             }
00332 
00333             if (lang) {
00334                 char *p;
00335                 char *next = lang->value;
00336                 uint8_t *len_ptr;
00337 
00338                 *q++ = 0x0a; /* ISO 639 language descriptor */
00339                 len_ptr = q++;
00340                 *len_ptr = 0;
00341 
00342                 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
00343                     next = strchr(p, ',');
00344                     if (strlen(p) != 3 && (!next || next != p + 3))
00345                         continue; /* not a 3-letter code */
00346 
00347                     *q++ = *p++;
00348                     *q++ = *p++;
00349                     *q++ = *p++;
00350 
00351                 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
00352                     *q++ = 0x01;
00353                 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
00354                     *q++ = 0x02;
00355                 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
00356                     *q++ = 0x03;
00357                 else
00358                     *q++ = 0; /* undefined type */
00359 
00360                     *len_ptr += 4;
00361                 }
00362 
00363                 if (*len_ptr == 0)
00364                     q -= 2; /* no language codes were written */
00365             }
00366             break;
00367         case AVMEDIA_TYPE_SUBTITLE:
00368             {
00369                 const char *language;
00370                 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
00371                 *q++ = 0x59;
00372                 *q++ = 8;
00373                 *q++ = language[0];
00374                 *q++ = language[1];
00375                 *q++ = language[2];
00376                 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
00377                 if(st->codec->extradata_size == 4) {
00378                     memcpy(q, st->codec->extradata, 4);
00379                     q += 4;
00380                 } else {
00381                     put16(&q, 1); /* page id */
00382                     put16(&q, 1); /* ancillary page id */
00383                 }
00384             }
00385             break;
00386         case AVMEDIA_TYPE_VIDEO:
00387             if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
00388                 *q++ = 0x05; /*MPEG-2 registration descriptor*/
00389                 *q++ = 4;
00390                 *q++ = 'd';
00391                 *q++ = 'r';
00392                 *q++ = 'a';
00393                 *q++ = 'c';
00394             }
00395             break;
00396         }
00397 
00398         val = 0xf000 | (q - desc_length_ptr - 2);
00399         desc_length_ptr[0] = val >> 8;
00400         desc_length_ptr[1] = val;
00401     }
00402     mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
00403                           data, q - data);
00404 }
00405 
00406 /* NOTE: str == NULL is accepted for an empty string */
00407 static void putstr8(uint8_t **q_ptr, const char *str)
00408 {
00409     uint8_t *q;
00410     int len;
00411 
00412     q = *q_ptr;
00413     if (!str)
00414         len = 0;
00415     else
00416         len = strlen(str);
00417     *q++ = len;
00418     memcpy(q, str, len);
00419     q += len;
00420     *q_ptr = q;
00421 }
00422 
00423 static void mpegts_write_sdt(AVFormatContext *s)
00424 {
00425     MpegTSWrite *ts = s->priv_data;
00426     MpegTSService *service;
00427     uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
00428     int i, running_status, free_ca_mode, val;
00429 
00430     q = data;
00431     put16(&q, ts->onid);
00432     *q++ = 0xff;
00433     for(i = 0; i < ts->nb_services; i++) {
00434         service = ts->services[i];
00435         put16(&q, service->sid);
00436         *q++ = 0xfc | 0x00; /* currently no EIT info */
00437         desc_list_len_ptr = q;
00438         q += 2;
00439         running_status = 4; /* running */
00440         free_ca_mode = 0;
00441 
00442         /* write only one descriptor for the service name and provider */
00443         *q++ = 0x48;
00444         desc_len_ptr = q;
00445         q++;
00446         *q++ = 0x01; /* digital television service */
00447         putstr8(&q, service->provider_name);
00448         putstr8(&q, service->name);
00449         desc_len_ptr[0] = q - desc_len_ptr - 1;
00450 
00451         /* fill descriptor length */
00452         val = (running_status << 13) | (free_ca_mode << 12) |
00453             (q - desc_list_len_ptr - 2);
00454         desc_list_len_ptr[0] = val >> 8;
00455         desc_list_len_ptr[1] = val;
00456     }
00457     mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
00458                           data, q - data);
00459 }
00460 
00461 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
00462                                          int sid,
00463                                          const char *provider_name,
00464                                          const char *name)
00465 {
00466     MpegTSService *service;
00467 
00468     service = av_mallocz(sizeof(MpegTSService));
00469     if (!service)
00470         return NULL;
00471     service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
00472     service->sid = sid;
00473     service->provider_name = av_strdup(provider_name);
00474     service->name = av_strdup(name);
00475     service->pcr_pid = 0x1fff;
00476     dynarray_add(&ts->services, &ts->nb_services, service);
00477     return service;
00478 }
00479 
00480 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
00481 {
00482     return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
00483            ts->first_pcr;
00484 }
00485 
00486 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
00487 {
00488     MpegTSWrite *ts = s->priv_data;
00489     if (ts->m2ts_mode) {
00490         int64_t pcr = get_pcr(s->priv_data, s->pb);
00491         uint32_t tp_extra_header = pcr % 0x3fffffff;
00492         tp_extra_header = AV_RB32(&tp_extra_header);
00493         avio_write(s->pb, (unsigned char *) &tp_extra_header,
00494                 sizeof(tp_extra_header));
00495     }
00496 }
00497 
00498 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
00499 {
00500     AVFormatContext *ctx = s->opaque;
00501     mpegts_prefix_m2ts_header(ctx);
00502     avio_write(ctx->pb, packet, TS_PACKET_SIZE);
00503 }
00504 
00505 static int mpegts_write_header(AVFormatContext *s)
00506 {
00507     MpegTSWrite *ts = s->priv_data;
00508     MpegTSWriteStream *ts_st;
00509     MpegTSService *service;
00510     AVStream *st, *pcr_st = NULL;
00511     AVDictionaryEntry *title, *provider;
00512     int i, j;
00513     const char *service_name;
00514     const char *provider_name;
00515     int *pids;
00516     int ret;
00517 
00518     if (s->max_delay < 0) /* Not set by the caller */
00519         s->max_delay = 0;
00520 
00521     // round up to a whole number of TS packets
00522     ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
00523 
00524     ts->tsid = ts->transport_stream_id;
00525     ts->onid = ts->original_network_id;
00526     /* allocate a single DVB service */
00527     title = av_dict_get(s->metadata, "service_name", NULL, 0);
00528     if (!title)
00529         title = av_dict_get(s->metadata, "title", NULL, 0);
00530     service_name = title ? title->value : DEFAULT_SERVICE_NAME;
00531     provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
00532     provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
00533     service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
00534     service->pmt.write_packet = section_write_packet;
00535     service->pmt.opaque = s;
00536     service->pmt.cc = 15;
00537 
00538     ts->pat.pid = PAT_PID;
00539     ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
00540     ts->pat.write_packet = section_write_packet;
00541     ts->pat.opaque = s;
00542 
00543     ts->sdt.pid = SDT_PID;
00544     ts->sdt.cc = 15;
00545     ts->sdt.write_packet = section_write_packet;
00546     ts->sdt.opaque = s;
00547 
00548     pids = av_malloc(s->nb_streams * sizeof(*pids));
00549     if (!pids)
00550         return AVERROR(ENOMEM);
00551 
00552     /* assign pids to each stream */
00553     for(i = 0;i < s->nb_streams; i++) {
00554         st = s->streams[i];
00555         avpriv_set_pts_info(st, 33, 1, 90000);
00556         ts_st = av_mallocz(sizeof(MpegTSWriteStream));
00557         if (!ts_st) {
00558             ret = AVERROR(ENOMEM);
00559             goto fail;
00560         }
00561         st->priv_data = ts_st;
00562         ts_st->payload = av_mallocz(ts->pes_payload_size);
00563         if (!ts_st->payload) {
00564             ret = AVERROR(ENOMEM);
00565             goto fail;
00566         }
00567         ts_st->service = service;
00568         /* MPEG pid values < 16 are reserved. Applications which set st->id in
00569          * this range are assigned a calculated pid. */
00570         if (st->id < 16) {
00571             ts_st->pid = ts->start_pid + i;
00572         } else if (st->id < 0x1FFF) {
00573             ts_st->pid = st->id;
00574         } else {
00575             av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
00576             ret = AVERROR(EINVAL);
00577             goto fail;
00578         }
00579         if (ts_st->pid == service->pmt.pid) {
00580             av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
00581             ret = AVERROR(EINVAL);
00582             goto fail;
00583         }
00584         for (j = 0; j < i; j++)
00585             if (pids[j] == ts_st->pid) {
00586                 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
00587                 ret = AVERROR(EINVAL);
00588                 goto fail;
00589             }
00590         pids[i] = ts_st->pid;
00591         ts_st->payload_pts = AV_NOPTS_VALUE;
00592         ts_st->payload_dts = AV_NOPTS_VALUE;
00593         ts_st->first_pts_check = 1;
00594         ts_st->cc = 15;
00595         /* update PCR pid by using the first video stream */
00596         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
00597             service->pcr_pid == 0x1fff) {
00598             service->pcr_pid = ts_st->pid;
00599             pcr_st = st;
00600         }
00601         if (st->codec->codec_id == AV_CODEC_ID_AAC &&
00602             st->codec->extradata_size > 0)
00603         {
00604             AVStream *ast;
00605             ts_st->amux = avformat_alloc_context();
00606             if (!ts_st->amux) {
00607                 ret = AVERROR(ENOMEM);
00608                 goto fail;
00609             }
00610             ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
00611             if (!ts_st->amux->oformat) {
00612                 ret = AVERROR(EINVAL);
00613                 goto fail;
00614             }
00615             ast = avformat_new_stream(ts_st->amux, NULL);
00616             ret = avcodec_copy_context(ast->codec, st->codec);
00617             if (ret != 0)
00618                 goto fail;
00619             ret = avformat_write_header(ts_st->amux, NULL);
00620             if (ret < 0)
00621                 goto fail;
00622         }
00623     }
00624 
00625     av_free(pids);
00626 
00627     /* if no video stream, use the first stream as PCR */
00628     if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
00629         pcr_st = s->streams[0];
00630         ts_st = pcr_st->priv_data;
00631         service->pcr_pid = ts_st->pid;
00632     }
00633 
00634     if (ts->mux_rate > 1) {
00635         service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
00636             (TS_PACKET_SIZE * 8 * 1000);
00637         ts->sdt_packet_period      = (ts->mux_rate * SDT_RETRANS_TIME) /
00638             (TS_PACKET_SIZE * 8 * 1000);
00639         ts->pat_packet_period      = (ts->mux_rate * PAT_RETRANS_TIME) /
00640             (TS_PACKET_SIZE * 8 * 1000);
00641 
00642         if(ts->copyts < 1)
00643             ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
00644     } else {
00645         /* Arbitrary values, PAT/PMT will also be written on video key frames */
00646         ts->sdt_packet_period = 200;
00647         ts->pat_packet_period = 40;
00648         if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00649             if (!pcr_st->codec->frame_size) {
00650                 av_log(s, AV_LOG_WARNING, "frame size not set\n");
00651                 service->pcr_packet_period =
00652                     pcr_st->codec->sample_rate/(10*512);
00653             } else {
00654                 service->pcr_packet_period =
00655                     pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
00656             }
00657         } else {
00658             // max delta PCR 0.1s
00659             service->pcr_packet_period =
00660                 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
00661         }
00662         if(!service->pcr_packet_period)
00663             service->pcr_packet_period = 1;
00664     }
00665 
00666     // output a PCR as soon as possible
00667     service->pcr_packet_count = service->pcr_packet_period;
00668     ts->pat_packet_count = ts->pat_packet_period-1;
00669     ts->sdt_packet_count = ts->sdt_packet_period-1;
00670 
00671     if (ts->mux_rate == 1)
00672         av_log(s, AV_LOG_INFO, "muxrate VBR, ");
00673     else
00674         av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
00675     av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
00676            "sdt every %d, pat/pmt every %d pkts\n",
00677            service->pcr_packet_period,
00678            ts->sdt_packet_period, ts->pat_packet_period);
00679 
00680     if (ts->m2ts_mode == -1) {
00681         if (av_match_ext(s->filename, "m2ts")) {
00682             ts->m2ts_mode = 1;
00683         } else {
00684             ts->m2ts_mode = 0;
00685         }
00686     }
00687 
00688     avio_flush(s->pb);
00689 
00690     return 0;
00691 
00692  fail:
00693     av_free(pids);
00694     for(i = 0;i < s->nb_streams; i++) {
00695         MpegTSWriteStream *ts_st;
00696         st = s->streams[i];
00697         ts_st = st->priv_data;
00698         if (ts_st) {
00699             av_freep(&ts_st->payload);
00700             if (ts_st->amux) {
00701                 avformat_free_context(ts_st->amux);
00702                 ts_st->amux = NULL;
00703             }
00704         }
00705         av_freep(&st->priv_data);
00706     }
00707     return ret;
00708 }
00709 
00710 /* send SDT, PAT and PMT tables regulary */
00711 static void retransmit_si_info(AVFormatContext *s, int force_pat)
00712 {
00713     MpegTSWrite *ts = s->priv_data;
00714     int i;
00715 
00716     if (++ts->sdt_packet_count == ts->sdt_packet_period) {
00717         ts->sdt_packet_count = 0;
00718         mpegts_write_sdt(s);
00719     }
00720     if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {
00721         ts->pat_packet_count = 0;
00722         mpegts_write_pat(s);
00723         for(i = 0; i < ts->nb_services; i++) {
00724             mpegts_write_pmt(s, ts->services[i]);
00725         }
00726     }
00727 }
00728 
00729 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
00730 {
00731     int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
00732 
00733     *buf++ = pcr_high >> 25;
00734     *buf++ = pcr_high >> 17;
00735     *buf++ = pcr_high >> 9;
00736     *buf++ = pcr_high >> 1;
00737     *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
00738     *buf++ = pcr_low;
00739 
00740     return 6;
00741 }
00742 
00743 /* Write a single null transport stream packet */
00744 static void mpegts_insert_null_packet(AVFormatContext *s)
00745 {
00746     uint8_t *q;
00747     uint8_t buf[TS_PACKET_SIZE];
00748 
00749     q = buf;
00750     *q++ = 0x47;
00751     *q++ = 0x00 | 0x1f;
00752     *q++ = 0xff;
00753     *q++ = 0x10;
00754     memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
00755     mpegts_prefix_m2ts_header(s);
00756     avio_write(s->pb, buf, TS_PACKET_SIZE);
00757 }
00758 
00759 /* Write a single transport stream packet with a PCR and no payload */
00760 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
00761 {
00762     MpegTSWrite *ts = s->priv_data;
00763     MpegTSWriteStream *ts_st = st->priv_data;
00764     uint8_t *q;
00765     uint8_t buf[TS_PACKET_SIZE];
00766 
00767     q = buf;
00768     *q++ = 0x47;
00769     *q++ = ts_st->pid >> 8;
00770     *q++ = ts_st->pid;
00771     *q++ = 0x20 | ts_st->cc;   /* Adaptation only */
00772     /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
00773     *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
00774     *q++ = 0x10;               /* Adaptation flags: PCR present */
00775 
00776     /* PCR coded into 6 bytes */
00777     q += write_pcr_bits(q, get_pcr(ts, s->pb));
00778 
00779     /* stuffing bytes */
00780     memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
00781     mpegts_prefix_m2ts_header(s);
00782     avio_write(s->pb, buf, TS_PACKET_SIZE);
00783 }
00784 
00785 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
00786 {
00787     int val;
00788 
00789     val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
00790     *q++ = val;
00791     val = (((pts >> 15) & 0x7fff) << 1) | 1;
00792     *q++ = val >> 8;
00793     *q++ = val;
00794     val = (((pts) & 0x7fff) << 1) | 1;
00795     *q++ = val >> 8;
00796     *q++ = val;
00797 }
00798 
00799 /* Set an adaptation field flag in an MPEG-TS packet*/
00800 static void set_af_flag(uint8_t *pkt, int flag)
00801 {
00802     // expect at least one flag to set
00803     av_assert0(flag);
00804 
00805     if ((pkt[3] & 0x20) == 0) {
00806         // no AF yet, set adaptation field flag
00807         pkt[3] |= 0x20;
00808         // 1 byte length, no flags
00809         pkt[4] = 1;
00810         pkt[5] = 0;
00811     }
00812     pkt[5] |= flag;
00813 }
00814 
00815 /* Extend the adaptation field by size bytes */
00816 static void extend_af(uint8_t *pkt, int size)
00817 {
00818     // expect already existing adaptation field
00819     av_assert0(pkt[3] & 0x20);
00820     pkt[4] += size;
00821 }
00822 
00823 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
00824 static uint8_t *get_ts_payload_start(uint8_t *pkt)
00825 {
00826     if (pkt[3] & 0x20)
00827         return pkt + 5 + pkt[4];
00828     else
00829         return pkt + 4;
00830 }
00831 
00832 /* Add a pes header to the front of payload, and segment into an integer number of
00833  * ts packets. The final ts packet is padded using an over-sized adaptation header
00834  * to exactly fill the last ts packet.
00835  * NOTE: 'payload' contains a complete PES payload.
00836  */
00837 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
00838                              const uint8_t *payload, int payload_size,
00839                              int64_t pts, int64_t dts, int key)
00840 {
00841     MpegTSWriteStream *ts_st = st->priv_data;
00842     MpegTSWrite *ts = s->priv_data;
00843     uint8_t buf[TS_PACKET_SIZE];
00844     uint8_t *q;
00845     int val, is_start, len, header_len, write_pcr, private_code, flags;
00846     int afc_len, stuffing_len;
00847     int64_t pcr = -1; /* avoid warning */
00848     int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
00849     int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
00850 
00851     is_start = 1;
00852     while (payload_size > 0) {
00853         retransmit_si_info(s, force_pat);
00854         force_pat = 0;
00855 
00856         write_pcr = 0;
00857         if (ts_st->pid == ts_st->service->pcr_pid) {
00858             if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
00859                 ts_st->service->pcr_packet_count++;
00860             if (ts_st->service->pcr_packet_count >=
00861                 ts_st->service->pcr_packet_period) {
00862                 ts_st->service->pcr_packet_count = 0;
00863                 write_pcr = 1;
00864             }
00865         }
00866 
00867         if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
00868             (dts - get_pcr(ts, s->pb)/300) > delay) {
00869             /* pcr insert gets priority over null packet insert */
00870             if (write_pcr)
00871                 mpegts_insert_pcr_only(s, st);
00872             else
00873                 mpegts_insert_null_packet(s);
00874             continue; /* recalculate write_pcr and possibly retransmit si_info */
00875         }
00876 
00877         /* prepare packet header */
00878         q = buf;
00879         *q++ = 0x47;
00880         val = (ts_st->pid >> 8);
00881         if (is_start)
00882             val |= 0x40;
00883         *q++ = val;
00884         *q++ = ts_st->pid;
00885         ts_st->cc = (ts_st->cc + 1) & 0xf;
00886         *q++ = 0x10 | ts_st->cc; // payload indicator + CC
00887         if (key && is_start && pts != AV_NOPTS_VALUE) {
00888             // set Random Access for key frames
00889             if (ts_st->pid == ts_st->service->pcr_pid)
00890                 write_pcr = 1;
00891             set_af_flag(buf, 0x40);
00892             q = get_ts_payload_start(buf);
00893         }
00894         if (write_pcr) {
00895             set_af_flag(buf, 0x10);
00896             q = get_ts_payload_start(buf);
00897             // add 11, pcr references the last byte of program clock reference base
00898             if (ts->mux_rate > 1)
00899                 pcr = get_pcr(ts, s->pb);
00900             else
00901                 pcr = (dts - delay)*300;
00902             if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
00903                 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
00904             extend_af(buf, write_pcr_bits(q, pcr));
00905             q = get_ts_payload_start(buf);
00906         }
00907         if (is_start) {
00908             int pes_extension = 0;
00909             /* write PES header */
00910             *q++ = 0x00;
00911             *q++ = 0x00;
00912             *q++ = 0x01;
00913             private_code = 0;
00914             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00915                 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
00916                     *q++ = 0xfd;
00917                 } else
00918                     *q++ = 0xe0;
00919             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
00920                        (st->codec->codec_id == AV_CODEC_ID_MP2 ||
00921                         st->codec->codec_id == AV_CODEC_ID_MP3 ||
00922                         st->codec->codec_id == AV_CODEC_ID_AAC)) {
00923                 *q++ = 0xc0;
00924             } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
00925                         st->codec->codec_id == AV_CODEC_ID_AC3 &&
00926                         ts->m2ts_mode) {
00927                 *q++ = 0xfd;
00928             } else {
00929                 *q++ = 0xbd;
00930                 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
00931                     private_code = 0x20;
00932                 }
00933             }
00934             header_len = 0;
00935             flags = 0;
00936             if (pts != AV_NOPTS_VALUE) {
00937                 header_len += 5;
00938                 flags |= 0x80;
00939             }
00940             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
00941                 header_len += 5;
00942                 flags |= 0x40;
00943             }
00944             if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
00945                 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
00946                 /* set PES_extension_flag */
00947                 pes_extension = 1;
00948                 flags |= 0x01;
00949 
00950                 /*
00951                 * One byte for PES2 extension flag +
00952                 * one byte for extension length +
00953                 * one byte for extension id
00954                 */
00955                 header_len += 3;
00956             }
00957             /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
00958              * otherwise it will not play sound on blu-ray
00959              */
00960             if (ts->m2ts_mode &&
00961                 st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
00962                 st->codec->codec_id == AV_CODEC_ID_AC3) {
00963                         /* set PES_extension_flag */
00964                         pes_extension = 1;
00965                         flags |= 0x01;
00966                         header_len += 3;
00967             }
00968             len = payload_size + header_len + 3;
00969             if (private_code != 0)
00970                 len++;
00971             if (len > 0xffff)
00972                 len = 0;
00973             *q++ = len >> 8;
00974             *q++ = len;
00975             val = 0x80;
00976             /* data alignment indicator is required for subtitle data */
00977             if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
00978                 val |= 0x04;
00979             *q++ = val;
00980             *q++ = flags;
00981             *q++ = header_len;
00982             if (pts != AV_NOPTS_VALUE) {
00983                 write_pts(q, flags >> 6, pts);
00984                 q += 5;
00985             }
00986             if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
00987                 write_pts(q, 1, dts);
00988                 q += 5;
00989             }
00990             if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
00991                 flags = 0x01;  /* set PES_extension_flag_2 */
00992                 *q++ = flags;
00993                 *q++ = 0x80 | 0x01;  /* marker bit + extension length */
00994                 /*
00995                 * Set the stream id extension flag bit to 0 and
00996                 * write the extended stream id
00997                 */
00998                 *q++ = 0x00 | 0x60;
00999             }
01000             /* For Blu-ray AC3 Audio Setting extended flags */
01001           if (ts->m2ts_mode &&
01002               pes_extension &&
01003               st->codec->codec_id == AV_CODEC_ID_AC3) {
01004                       flags = 0x01; /* set PES_extension_flag_2 */
01005                       *q++ = flags;
01006                       *q++ = 0x80 | 0x01; /* marker bit + extension length */
01007                       *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
01008               }
01009 
01010 
01011             if (private_code != 0)
01012                 *q++ = private_code;
01013             is_start = 0;
01014         }
01015         /* header size */
01016         header_len = q - buf;
01017         /* data len */
01018         len = TS_PACKET_SIZE - header_len;
01019         if (len > payload_size)
01020             len = payload_size;
01021         stuffing_len = TS_PACKET_SIZE - header_len - len;
01022         if (stuffing_len > 0) {
01023             /* add stuffing with AFC */
01024             if (buf[3] & 0x20) {
01025                 /* stuffing already present: increase its size */
01026                 afc_len = buf[4] + 1;
01027                 memmove(buf + 4 + afc_len + stuffing_len,
01028                         buf + 4 + afc_len,
01029                         header_len - (4 + afc_len));
01030                 buf[4] += stuffing_len;
01031                 memset(buf + 4 + afc_len, 0xff, stuffing_len);
01032             } else {
01033                 /* add stuffing */
01034                 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
01035                 buf[3] |= 0x20;
01036                 buf[4] = stuffing_len - 1;
01037                 if (stuffing_len >= 2) {
01038                     buf[5] = 0x00;
01039                     memset(buf + 6, 0xff, stuffing_len - 2);
01040                 }
01041             }
01042         }
01043         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
01044         payload += len;
01045         payload_size -= len;
01046         mpegts_prefix_m2ts_header(s);
01047         avio_write(s->pb, buf, TS_PACKET_SIZE);
01048     }
01049     avio_flush(s->pb);
01050     ts_st->prev_payload_key = key;
01051 }
01052 
01053 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
01054 {
01055     AVStream *st = s->streams[pkt->stream_index];
01056     int size = pkt->size;
01057     uint8_t *buf= pkt->data;
01058     uint8_t *data= NULL;
01059     MpegTSWrite *ts = s->priv_data;
01060     MpegTSWriteStream *ts_st = st->priv_data;
01061     const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
01062     int64_t dts = pkt->dts, pts = pkt->pts;
01063 
01064     if (ts->reemit_pat_pmt) {
01065         av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
01066         ts->reemit_pat_pmt = 0;
01067         ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
01068     }
01069 
01070     if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
01071         ts->pat_packet_count = ts->pat_packet_period - 1;
01072         ts->sdt_packet_count = ts->sdt_packet_period - 1;
01073         ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
01074     }
01075 
01076     if(ts->copyts < 1){
01077         if (pts != AV_NOPTS_VALUE)
01078             pts += delay;
01079         if (dts != AV_NOPTS_VALUE)
01080             dts += delay;
01081     }
01082 
01083     if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
01084         av_log(s, AV_LOG_ERROR, "first pts value must set\n");
01085         return AVERROR_INVALIDDATA;
01086     }
01087     ts_st->first_pts_check = 0;
01088 
01089     if (st->codec->codec_id == AV_CODEC_ID_H264) {
01090         const uint8_t *p = buf, *buf_end = p+size;
01091         uint32_t state = -1;
01092 
01093         if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
01094             av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
01095                    "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
01096             return AVERROR(EINVAL);
01097         }
01098 
01099         do {
01100             p = avpriv_mpv_find_start_code(p, buf_end, &state);
01101             //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
01102         } while (p < buf_end && (state & 0x1f) != 9 &&
01103                  (state & 0x1f) != 5 && (state & 0x1f) != 1);
01104 
01105         if ((state & 0x1f) != 9) { // AUD NAL
01106             data = av_malloc(pkt->size+6);
01107             if (!data)
01108                 return AVERROR(ENOMEM);
01109             memcpy(data+6, pkt->data, pkt->size);
01110             AV_WB32(data, 0x00000001);
01111             data[4] = 0x09;
01112             data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
01113             buf  = data;
01114             size = pkt->size+6;
01115         }
01116     } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
01117         if (pkt->size < 2) {
01118             av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
01119             return AVERROR_INVALIDDATA;
01120         }
01121         if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
01122             int ret;
01123             AVPacket pkt2;
01124 
01125             if (!ts_st->amux) {
01126                 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
01127                        "and extradata missing\n");
01128                 return AVERROR_INVALIDDATA;
01129             }
01130 
01131             av_init_packet(&pkt2);
01132             pkt2.data = pkt->data;
01133             pkt2.size = pkt->size;
01134             ret = avio_open_dyn_buf(&ts_st->amux->pb);
01135             if (ret < 0)
01136                 return AVERROR(ENOMEM);
01137 
01138             ret = av_write_frame(ts_st->amux, &pkt2);
01139             if (ret < 0) {
01140                 avio_close_dyn_buf(ts_st->amux->pb, &data);
01141                 ts_st->amux->pb = NULL;
01142                 av_free(data);
01143                 return ret;
01144             }
01145             size = avio_close_dyn_buf(ts_st->amux->pb, &data);
01146             ts_st->amux->pb = NULL;
01147             buf = data;
01148         }
01149     }
01150 
01151     if (pkt->dts != AV_NOPTS_VALUE) {
01152         int i;
01153         for(i=0; i<s->nb_streams; i++){
01154             AVStream *st2 = s->streams[i];
01155             MpegTSWriteStream *ts_st2 = st2->priv_data;
01156             if(   ts_st2->payload_size
01157                && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){
01158                 mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,
01159                                 ts_st2->payload_pts, ts_st2->payload_dts,
01160                                 ts_st2->payload_flags & AV_PKT_FLAG_KEY);
01161                 ts_st2->payload_size = 0;
01162             }
01163         }
01164     }
01165 
01166     if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {
01167         mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
01168                          ts_st->payload_pts, ts_st->payload_dts,
01169                          ts_st->payload_flags & AV_PKT_FLAG_KEY);
01170         ts_st->payload_size = 0;
01171     }
01172 
01173     if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
01174         av_assert0(!ts_st->payload_size);
01175         // for video and subtitle, write a single pes packet
01176         mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
01177         av_free(data);
01178         return 0;
01179     }
01180 
01181     if (!ts_st->payload_size) {
01182         ts_st->payload_pts = pts;
01183         ts_st->payload_dts = dts;
01184         ts_st->payload_flags = pkt->flags;
01185     }
01186 
01187     memcpy(ts_st->payload + ts_st->payload_size, buf, size);
01188     ts_st->payload_size += size;
01189 
01190     av_free(data);
01191 
01192     return 0;
01193 }
01194 
01195 static void mpegts_write_flush(AVFormatContext *s)
01196 {
01197     int i;
01198 
01199     /* flush current packets */
01200     for(i = 0; i < s->nb_streams; i++) {
01201         AVStream *st = s->streams[i];
01202         MpegTSWriteStream *ts_st = st->priv_data;
01203         if (ts_st->payload_size > 0) {
01204             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
01205                              ts_st->payload_pts, ts_st->payload_dts,
01206                              ts_st->payload_flags & AV_PKT_FLAG_KEY);
01207             ts_st->payload_size = 0;
01208         }
01209     }
01210     avio_flush(s->pb);
01211 }
01212 
01213 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
01214 {
01215     if (!pkt) {
01216         mpegts_write_flush(s);
01217         return 1;
01218     } else {
01219         return mpegts_write_packet_internal(s, pkt);
01220     }
01221 }
01222 
01223 static int mpegts_write_end(AVFormatContext *s)
01224 {
01225     MpegTSWrite *ts = s->priv_data;
01226     MpegTSService *service;
01227     int i;
01228 
01229     mpegts_write_flush(s);
01230 
01231     for(i = 0; i < s->nb_streams; i++) {
01232         AVStream *st = s->streams[i];
01233         MpegTSWriteStream *ts_st = st->priv_data;
01234         av_freep(&ts_st->payload);
01235         if (ts_st->amux) {
01236             avformat_free_context(ts_st->amux);
01237             ts_st->amux = NULL;
01238         }
01239     }
01240 
01241     for(i = 0; i < ts->nb_services; i++) {
01242         service = ts->services[i];
01243         av_freep(&service->provider_name);
01244         av_freep(&service->name);
01245         av_free(service);
01246     }
01247     av_free(ts->services);
01248 
01249     return 0;
01250 }
01251 
01252 AVOutputFormat ff_mpegts_muxer = {
01253     .name              = "mpegts",
01254     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
01255     .mime_type         = "video/x-mpegts",
01256     .extensions        = "ts,m2t,m2ts,mts",
01257     .priv_data_size    = sizeof(MpegTSWrite),
01258     .audio_codec       = AV_CODEC_ID_MP2,
01259     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,
01260     .write_header      = mpegts_write_header,
01261     .write_packet      = mpegts_write_packet,
01262     .write_trailer     = mpegts_write_end,
01263     .flags             = AVFMT_ALLOW_FLUSH,
01264     .priv_class        = &mpegts_muxer_class,
01265 };