From 5dbafeb7ba02e01d4b59b840099d94bb3ee11341 Mon Sep 17 00:00:00 2001 From: Fabrice Bellard Date: Fri, 13 Jun 2003 14:28:45 +0000 Subject: mpeg ts demux uses DVB SI info and generates correct PTS info - added prototype mpeg ts mux Originally committed as revision 1956 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/Makefile | 2 +- libavformat/mpegts.c | 930 ++++++++++++++++++++++++++++++++++++++++-------- libavformat/mpegts.h | 40 +++ libavformat/mpegtsenc.c | 582 ++++++++++++++++++++++++++++++ 4 files changed, 1398 insertions(+), 156 deletions(-) create mode 100644 libavformat/mpegts.h create mode 100644 libavformat/mpegtsenc.c diff --git a/libavformat/Makefile b/libavformat/Makefile index a9b8b65dee..647e687844 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -12,7 +12,7 @@ OBJS= utils.o cutils.o allformats.o PPOBJS= # mux and demuxes -OBJS+=mpeg.o mpegts.o ffm.o crc.o img.o raw.o rm.o \ +OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \ avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \ yuv4mpeg.o 4xm.o diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c index 92e1d51389..8e2898398b 100644 --- a/libavformat/mpegts.c +++ b/libavformat/mpegts.c @@ -1,6 +1,6 @@ /* * MPEG2 transport stream (aka DVB) demux - * Copyright (c) 2002 Fabrice Bellard. + * Copyright (c) 2002-2003 Fabrice Bellard. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -18,42 +18,193 @@ */ #include "avformat.h" -#define TS_FEC_PACKET_SIZE 204 -#define TS_PACKET_SIZE 188 -#define NB_PID_MAX 8192 +#include "mpegts.h" -enum MpegTSState { - MPEGTS_HEADER = 0, - MPEGTS_PESHEADER_FILL, - MPEGTS_PESHEADER_FLAGS, - MPEGTS_PESHEADER_SIZE, - MPEGTS_PESHEADER_READ, - MPEGTS_PAYLOAD, - MPEGTS_SKIP, +//#define DEBUG_SI + +/* 1.0 second at 24Mbit/s */ +#define MAX_SCAN_PACKETS 16000 + +static int add_pes_stream(AVFormatContext *s, int pid); + +enum MpegTSFilterType { + MPEGTS_PES, + MPEGTS_SECTION, }; -/* enough for PES header + length */ -#define MAX_HEADER_SIZE 6 +/* XXX: suppress 'pkt' parameter */ +typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start); -typedef struct MpegTSStream { +typedef struct MpegTSPESFilter { + PESCallback *pes_cb; + void *opaque; +} MpegTSPESFilter; + +typedef void SectionCallback(void *opaque, const uint8_t *buf, int len); + +typedef void SetServiceCallback(void *opaque, int ret); + +typedef struct MpegTSSectionFilter { + int section_index; + int section_h_size; + uint8_t *section_buf; + int check_crc:1; + int end_of_section_reached:1; + SectionCallback *section_cb; + void *opaque; +} MpegTSSectionFilter; + +typedef struct MpegTSFilter { int pid; - enum MpegTSState state; int last_cc; /* last cc code (-1 if first packet) */ - /* used to get the format */ - int header_size; - int payload_size; - int pes_header_size; - AVStream *st; - unsigned char header[MAX_HEADER_SIZE]; -} MpegTSStream; + enum MpegTSFilterType type; + union { + MpegTSPESFilter pes_filter; + MpegTSSectionFilter section_filter; + } u; +} MpegTSFilter; + +typedef struct MpegTSService { + int running:1; + int sid; + char *provider_name; + char *name; +} MpegTSService; typedef struct MpegTSContext { + /* user data */ + AVFormatContext *stream; int raw_packet_size; /* raw packet size, including FEC if present */ - MpegTSStream *pids[NB_PID_MAX]; + int auto_guess; /* if true, all pids are analized to find streams */ + int set_service_ret; + + /* data needed to handle file based ts */ + int stop_parse; /* stop parsing loop */ + AVPacket *pkt; /* packet containing av data */ + + /******************************************/ + /* private mpegts data */ + /* scan context */ + MpegTSFilter *sdt_filter; + int nb_services; + MpegTSService **services; + + /* set service context (XXX: allocated it ?) */ + SetServiceCallback *set_service_cb; + void *set_service_opaque; + MpegTSFilter *pat_filter; + MpegTSFilter *pmt_filter; + int req_sid; + + MpegTSFilter *pids[NB_PID_MAX]; } MpegTSContext; +static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1, + const uint8_t *buf, int buf_size, int is_start) +{ + MpegTSSectionFilter *tss = &tss1->u.section_filter; + int len; + unsigned int crc; + + if (is_start) { + memcpy(tss->section_buf, buf, buf_size); + tss->section_index = buf_size; + tss->section_h_size = -1; + tss->end_of_section_reached = 0; + } else { + if (tss->end_of_section_reached) + return; + len = 4096 - tss->section_index; + if (buf_size < len) + len = buf_size; + memcpy(tss->section_buf + tss->section_index, buf, len); + tss->section_index += len; + } + + /* compute section length if possible */ + if (tss->section_h_size == -1 && tss->section_index >= 3) { + len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3; + if (len > 4096) + return; + tss->section_h_size = len; + } + + if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) { + if (tss->check_crc) { + crc = mpegts_crc32(tss->section_buf, tss->section_h_size); + if (crc != 0) + goto invalid_crc; + } + tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size); + invalid_crc: + tss->end_of_section_reached = 1; + } +} + +MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, + SectionCallback *section_cb, void *opaque, + int check_crc) + +{ + MpegTSFilter *filter; + MpegTSSectionFilter *sec; + + if (pid >= NB_PID_MAX || ts->pids[pid]) + return NULL; + filter = av_mallocz(sizeof(MpegTSFilter)); + if (!filter) + return NULL; + ts->pids[pid] = filter; + filter->type = MPEGTS_SECTION; + filter->pid = pid; + filter->last_cc = -1; + sec = &filter->u.section_filter; + sec->section_cb = section_cb; + sec->opaque = opaque; + sec->section_buf = av_malloc(MAX_SECTION_SIZE); + sec->check_crc = check_crc; + if (!sec->section_buf) { + av_free(filter); + return NULL; + } + return filter; +} + +MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, + PESCallback *pes_cb, + void *opaque) +{ + MpegTSFilter *filter; + MpegTSPESFilter *pes; + + if (pid >= NB_PID_MAX || ts->pids[pid]) + return NULL; + filter = av_mallocz(sizeof(MpegTSFilter)); + if (!filter) + return NULL; + ts->pids[pid] = filter; + filter->type = MPEGTS_PES; + filter->pid = pid; + filter->last_cc = -1; + pes = &filter->u.pes_filter; + pes->pes_cb = pes_cb; + pes->opaque = opaque; + return filter; +} + +void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter) +{ + int pid; + + pid = filter->pid; + if (filter->type == MPEGTS_SECTION) + av_freep(&filter->u.section_filter.section_buf); + av_free(filter); + ts->pids[pid] = NULL; +} + /* autodetect fec presence. Must have at least 1024 bytes */ -static int get_packet_size(const unsigned char *buf, int size) +static int get_packet_size(const uint8_t *buf, int size) { int i; @@ -72,78 +223,400 @@ static int get_packet_size(const unsigned char *buf, int size) return TS_FEC_PACKET_SIZE; } -static int mpegts_probe(AVProbeData *p) +typedef struct SectionHeader { + uint8_t tid; + uint16_t id; + uint8_t version; + uint8_t sec_num; + uint8_t last_sec_num; +} SectionHeader; + +static inline int get8(const uint8_t **pp, const uint8_t *p_end) { - int size; - size = get_packet_size(p->buf, p->buf_size); - if (size < 0) - return 0; - return AVPROBE_SCORE_MAX - 1; + const uint8_t *p; + int c; + + p = *pp; + if (p >= p_end) + return -1; + c = *p++; + *pp = p; + return c; } -static int mpegts_read_header(AVFormatContext *s, - AVFormatParameters *ap) +static inline int get16(const uint8_t **pp, const uint8_t *p_end) +{ + const uint8_t *p; + int c; + + p = *pp; + if ((p + 1) >= p_end) + return -1; + c = (p[0] << 8) | p[1]; + p += 2; + *pp = p; + return c; +} + +/* read and allocate a DVB string preceeded by its length */ +static char *getstr8(const uint8_t **pp, const uint8_t *p_end) { - MpegTSContext *ts = s->priv_data; - ByteIOContext *pb = &s->pb; - unsigned char buf[1024]; int len; - int64_t pos; + const uint8_t *p; + char *str; - /* read the first 1024 bytes to get packet size */ - pos = url_ftell(pb); - len = get_buffer(pb, buf, sizeof(buf)); - if (len != sizeof(buf)) - goto fail; - ts->raw_packet_size = get_packet_size(buf, sizeof(buf)); - if (ts->raw_packet_size <= 0) - goto fail; - /* go again to the start */ - url_fseek(pb, pos, SEEK_SET); + p = *pp; + len = get8(&p, p_end); + if (len < 0) + return NULL; + if ((p + len) > p_end) + return NULL; + str = av_malloc(len + 1); + if (!str) + return NULL; + memcpy(str, p, len); + str[len] = '\0'; + p += len; + *pp = p; + return str; +} + +static int parse_section_header(SectionHeader *h, + const uint8_t **pp, const uint8_t *p_end) +{ + int val; + + val = get8(pp, p_end); + if (val < 0) + return -1; + h->tid = val; + *pp += 2; + val = get16(pp, p_end); + if (val < 0) + return -1; + h->id = val; + val = get8(pp, p_end); + if (val < 0) + return -1; + h->version = (val >> 1) & 0x1f; + val = get8(pp, p_end); + if (val < 0) + return -1; + h->sec_num = val; + val = get8(pp, p_end); + if (val < 0) + return -1; + h->last_sec_num = val; return 0; - fail: - return -1; +} + +static MpegTSService *new_service(MpegTSContext *ts, int sid, + char *provider_name, char *name) +{ + MpegTSService *service; + +#ifdef DEBUG_SI + printf("new_service: sid=0x%04x provider='%s' name='%s'\n", + sid, provider_name, name); +#endif + + service = av_mallocz(sizeof(MpegTSService)); + if (!service) + return NULL; + service->sid = sid; + service->provider_name = provider_name; + service->name = name; + dynarray_add(&ts->services, &ts->nb_services, service); + return service; +} + +static void pmt_cb(void *opaque, const uint8_t *section, int section_len) +{ + MpegTSContext *ts = opaque; + SectionHeader h1, *h = &h1; + const uint8_t *p, *p_end; + int program_info_length, pcr_pid, pid, stream_type, desc_length; + +#ifdef DEBUG_SI + printf("PMT:\n"); + av_hex_dump((uint8_t *)section, section_len); +#endif + p_end = section + section_len - 4; + p = section; + if (parse_section_header(h, &p, p_end) < 0) + return; +#ifdef DEBUG_SI + printf("sid=0x%x sec_num=%d/%d\n", h->id, h->sec_num, h->last_sec_num); +#endif + if (h->tid != PMT_TID || h->id != ts->req_sid) + return; + + pcr_pid = get16(&p, p_end) & 0x1fff; + if (pcr_pid < 0) + return; +#ifdef DEBUG_SI + printf("pcr_pid=0x%x\n", pcr_pid); +#endif + program_info_length = get16(&p, p_end) & 0xfff; + if (program_info_length < 0) + return; + p += program_info_length; + if (p >= p_end) + return; + for(;;) { + stream_type = get8(&p, p_end); + if (stream_type < 0) + break; + pid = get16(&p, p_end) & 0x1fff; + if (pid < 0) + break; + desc_length = get16(&p, p_end) & 0xfff; + if (desc_length < 0) + break; + p += desc_length; + if (p > p_end) + return; + +#ifdef DEBUG_SI + printf("stream_type=%d pid=0x%x\n", stream_type, pid); +#endif + + /* now create ffmpeg stream */ + switch(stream_type) { + case STREAM_TYPE_AUDIO: + case STREAM_TYPE_VIDEO: + add_pes_stream(ts->stream, pid); + break; + default: + /* we ignore the other streams */ + break; + } + } + /* all parameters are there */ + ts->set_service_cb(ts->set_service_opaque, 0); + mpegts_close_filter(ts, ts->pmt_filter); + ts->pmt_filter = NULL; +} + +static void pat_cb(void *opaque, const uint8_t *section, int section_len) +{ + MpegTSContext *ts = opaque; + SectionHeader h1, *h = &h1; + const uint8_t *p, *p_end; + int sid, pmt_pid; + +#ifdef DEBUG_SI + printf("PAT:\n"); + av_hex_dump((uint8_t *)section, section_len); +#endif + p_end = section + section_len - 4; + p = section; + if (parse_section_header(h, &p, p_end) < 0) + return; + if (h->tid != PAT_TID) + return; + + for(;;) { + sid = get16(&p, p_end); + if (sid < 0) + break; + pmt_pid = get16(&p, p_end) & 0x1fff; + if (pmt_pid < 0) + break; +#ifdef DEBUG_SI + printf("sid=0x%x pid=0x%x\n", sid, pmt_pid); +#endif + if (sid == 0x0000) { + /* NIT info */ + } else { + if (ts->req_sid == sid) { + ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid, + pmt_cb, ts, 1); + goto found; + } + } + } + /* not found */ + ts->set_service_cb(ts->set_service_opaque, -1); + + found: + mpegts_close_filter(ts, ts->pat_filter); + ts->pat_filter = NULL; +} + +void mpegts_set_service(MpegTSContext *ts, int sid, + SetServiceCallback *set_service_cb, void *opaque) +{ + ts->set_service_cb = set_service_cb; + ts->set_service_opaque = opaque; + ts->req_sid = sid; + ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID, + pat_cb, ts, 1); +} + +static void sdt_cb(void *opaque, const uint8_t *section, int section_len) +{ + MpegTSContext *ts = opaque; + SectionHeader h1, *h = &h1; + const uint8_t *p, *p_end, *desc_list_end, *desc_end; + int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type; + char *name, *provider_name; + +#ifdef DEBUG_SI + printf("SDT:\n"); + av_hex_dump((uint8_t *)section, section_len); +#endif + + p_end = section + section_len - 4; + p = section; + if (parse_section_header(h, &p, p_end) < 0) + return; + if (h->tid != SDT_TID) + return; + onid = get16(&p, p_end); + if (onid < 0) + return; + val = get8(&p, p_end); + if (val < 0) + return; + for(;;) { + sid = get16(&p, p_end); + if (sid < 0) + break; + val = get8(&p, p_end); + if (val < 0) + break; + desc_list_len = get16(&p, p_end) & 0xfff; + if (desc_list_len < 0) + break; + desc_list_end = p + desc_list_len; + if (desc_list_end > p_end) + break; + for(;;) { + desc_tag = get8(&p, desc_list_end); + if (desc_tag < 0) + break; + desc_len = get8(&p, desc_list_end); + desc_end = p + desc_len; + if (desc_end > desc_list_end) + break; +#ifdef DEBUG_SI + printf("tag: 0x%02x len=%d\n", desc_tag, desc_len); +#endif + switch(desc_tag) { + case 0x48: + service_type = get8(&p, p_end); + if (service_type < 0) + break; + provider_name = getstr8(&p, p_end); + if (!provider_name) + break; + name = getstr8(&p, p_end); + if (!name) + break; + new_service(ts, sid, provider_name, name); + break; + default: + break; + } + p = desc_end; + } + p = desc_list_end; + } + ts->stop_parse = 1; + + /* remove filter */ + mpegts_close_filter(ts, ts->sdt_filter); + ts->sdt_filter = NULL; +} + +/* scan services an a transport stream by looking at the sdt */ +void mpegts_scan_sdt(MpegTSContext *ts) +{ + ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID, + sdt_cb, ts, 1); +} + + +/* TS stream handling */ + +enum MpegTSState { + MPEGTS_HEADER = 0, + MPEGTS_PESHEADER_FILL, + MPEGTS_PAYLOAD, + MPEGTS_SKIP, +}; + +/* enough for PES header + length */ +#define PES_START_SIZE 9 +#define MAX_PES_HEADER_SIZE (9 + 255) + +typedef struct PESContext { + int pid; + AVFormatContext *stream; + AVStream *st; + enum MpegTSState state; + /* used to get the format */ + int data_index; + int total_size; + int pes_header_size; + int64_t pts, dts; + uint8_t header[MAX_PES_HEADER_SIZE]; +} PESContext; + +static int64_t get_pts(const uint8_t *p) +{ + int64_t pts; + int val; + + pts = (int64_t)((p[0] >> 1) & 0x07) << 30; + val = (p[1] << 8) | p[2]; + pts |= (int64_t)(val >> 1) << 15; + val = (p[3] << 8) | p[4]; + pts |= (int64_t)(val >> 1); + return pts; } /* return non zero if a packet could be constructed */ -static int mpegts_push_data(AVFormatContext *s, MpegTSStream *tss, - AVPacket *pkt, - const unsigned char *buf, int buf_size, int is_start) +static void mpegts_push_data(void *opaque, + const uint8_t *buf, int buf_size, int is_start) { + PESContext *pes = opaque; + MpegTSContext *ts = pes->stream->priv_data; AVStream *st; - const unsigned char *p; + const uint8_t *p; int len, code, codec_type, codec_id; - + if (is_start) { - tss->state = MPEGTS_HEADER; - tss->header_size = 0; + pes->state = MPEGTS_HEADER; + pes->data_index = 0; } p = buf; while (buf_size > 0) { - len = buf_size; - switch(tss->state) { + switch(pes->state) { case MPEGTS_HEADER: - if (len > MAX_HEADER_SIZE - tss->header_size) - len = MAX_HEADER_SIZE - tss->header_size; - memcpy(tss->header, p, len); - tss->header_size += len; + len = PES_START_SIZE - pes->data_index; + if (len > buf_size) + len = buf_size; + memcpy(pes->header + pes->data_index, p, len); + pes->data_index += len; p += len; buf_size -= len; - if (tss->header_size == MAX_HEADER_SIZE) { + if (pes->data_index == PES_START_SIZE) { /* we got all the PES or section header. We can now decide */ #if 0 - av_hex_dump(tss->header, tss->header_size); + av_hex_dump(pes->header, pes->data_index); #endif - if (tss->header[0] == 0x00 && tss->header[1] == 0x00 && - tss->header[2] == 0x01) { + if (pes->header[0] == 0x00 && pes->header[1] == 0x00 && + pes->header[2] == 0x01) { /* it must be an mpeg2 PES stream */ /* XXX: add AC3 support */ - code = tss->header[3] | 0x100; + code = pes->header[3] | 0x100; if (!((code >= 0x1c0 && code <= 0x1df) || (code >= 0x1e0 && code <= 0x1ef))) goto skip; - if (!tss->st) { + if (!pes->st) { /* allocate stream */ if (code >= 0x1c0 && code <= 0x1df) { codec_type = CODEC_TYPE_AUDIO; @@ -152,23 +625,26 @@ static int mpegts_push_data(AVFormatContext *s, MpegTSStream *tss, codec_type = CODEC_TYPE_VIDEO; codec_id = CODEC_ID_MPEG1VIDEO; } - st = av_new_stream(s, tss->pid); + st = av_new_stream(pes->stream, pes->pid); if (st) { - st->priv_data = tss; + st->priv_data = pes; st->codec.codec_type = codec_type; st->codec.codec_id = codec_id; - tss->st = st; + pes->st = st; } } - tss->state = MPEGTS_PESHEADER_FILL; - tss->payload_size = (tss->header[4] << 8) | tss->header[5]; - if (tss->payload_size == 0) - tss->payload_size = 65536; + pes->state = MPEGTS_PESHEADER_FILL; + pes->total_size = (pes->header[4] << 8) | pes->header[5]; + /* NOTE: a zero total size means the PES size is + unbounded */ + if (pes->total_size) + pes->total_size += 6; + pes->pes_header_size = pes->header[8] + 9; } else { /* otherwise, it should be a table */ /* skip packet */ skip: - tss->state = MPEGTS_SKIP; + pes->state = MPEGTS_SKIP; continue; } } @@ -176,49 +652,54 @@ static int mpegts_push_data(AVFormatContext *s, MpegTSStream *tss, /**********************************************/ /* PES packing parsing */ case MPEGTS_PESHEADER_FILL: - /* skip filling */ - code = *p++; - buf_size--; - tss->payload_size--; - if (code != 0xff) { - if ((code & 0xc0) != 0x80) - goto skip; - tss->state = MPEGTS_PESHEADER_FLAGS; - } - break; - case MPEGTS_PESHEADER_FLAGS: - code = *p++; - buf_size--; - tss->payload_size--; - tss->state = MPEGTS_PESHEADER_SIZE; - break; - case MPEGTS_PESHEADER_SIZE: - tss->pes_header_size = *p++; - buf_size--; - tss->payload_size--; - tss->state = MPEGTS_PESHEADER_READ; - break; - case MPEGTS_PESHEADER_READ: - /* currently we do nothing except skipping */ - if (len > tss->pes_header_size) - len = tss->pes_header_size; + len = pes->pes_header_size - pes->data_index; + if (len > buf_size) + len = buf_size; + memcpy(pes->header + pes->data_index, p, len); + pes->data_index += len; p += len; buf_size -= len; - tss->pes_header_size -= len; - tss->payload_size -= len; - if (tss->pes_header_size == 0) - tss->state = MPEGTS_PAYLOAD; + if (pes->data_index == pes->pes_header_size) { + const uint8_t *r; + unsigned int flags; + + flags = pes->header[7]; + r = pes->header + 9; + pes->pts = AV_NOPTS_VALUE; + pes->dts = AV_NOPTS_VALUE; + if ((flags & 0xc0) == 0x80) { + pes->pts = get_pts(r); + r += 5; + } else if ((flags & 0xc0) == 0xc0) { + pes->pts = get_pts(r); + r += 5; + pes->dts = get_pts(r); + r += 5; + } + /* we got the full header. We parse it and get the payload */ + pes->state = MPEGTS_PAYLOAD; + } break; case MPEGTS_PAYLOAD: - if (len > tss->payload_size) - len = tss->payload_size; + if (pes->total_size) { + len = pes->total_size - pes->data_index; + if (len > buf_size) + len = buf_size; + } else { + len = buf_size; + } if (len > 0) { - if (tss->st && av_new_packet(pkt, buf_size) == 0) { - memcpy(pkt->data, p, buf_size); - pkt->stream_index = tss->st->index; - return 1; + AVPacket *pkt = ts->pkt; + if (pes->st && av_new_packet(pkt, len) == 0) { + memcpy(pkt->data, p, len); + pkt->stream_index = pes->st->index; + pkt->pts = pes->pts; + /* reset pts values */ + pes->pts = AV_NOPTS_VALUE; + pes->dts = AV_NOPTS_VALUE; + ts->stop_parse = 1; + return; } - tss->payload_size -= len; } buf_size = 0; break; @@ -227,20 +708,110 @@ static int mpegts_push_data(AVFormatContext *s, MpegTSStream *tss, break; } } +} + +static int add_pes_stream(AVFormatContext *s, int pid) +{ + MpegTSContext *ts = s->priv_data; + MpegTSFilter *tss; + PESContext *pes; + + /* if no pid found, then add a pid context */ + pes = av_mallocz(sizeof(PESContext)); + if (!pes) + return -1; + pes->stream = s; + pes->pid = pid; + tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes); + if (!tss) { + av_free(pes); + return -1; + } return 0; } -static int mpegts_read_packet(AVFormatContext *s, - AVPacket *pkt) +/* handle one TS packet */ +static void handle_packet(AVFormatContext *s, uint8_t *packet) { MpegTSContext *ts = s->priv_data; - MpegTSStream *tss; - ByteIOContext *pb = &s->pb; - unsigned char packet[TS_FEC_PACKET_SIZE]; - int len, pid, cc, cc_ok, afc; - const unsigned char *p; + MpegTSFilter *tss; + int len, pid, cc, cc_ok, afc, is_start; + const uint8_t *p, *p_end; + + pid = ((packet[1] & 0x1f) << 8) | packet[2]; + is_start = packet[1] & 0x40; + tss = ts->pids[pid]; + if (ts->auto_guess && tss == NULL && is_start) { + add_pes_stream(s, pid); + tss = ts->pids[pid]; + } + if (!tss) + return; + + /* continuity check (currently not used) */ + cc = (packet[3] & 0xf); + cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc)); + tss->last_cc = cc; + /* skip adaptation field */ + afc = (packet[3] >> 4) & 3; + p = packet + 4; + if (afc == 0) /* reserved value */ + return; + if (afc == 2) /* adaptation field only */ + return; + if (afc == 3) { + /* skip adapation field */ + p += p[0] + 1; + } + /* if past the end of packet, ignore */ + p_end = packet + TS_PACKET_SIZE; + if (p >= p_end) + return; + + if (tss->type == MPEGTS_SECTION) { + if (is_start) { + /* pointer field present */ + len = *p++; + if (p + len > p_end) + return; + if (len && cc_ok) { + /* write remaning section bytes */ + write_section_data(s, tss, + p, len, 0); + } + p += len; + if (p < p_end) { + write_section_data(s, tss, + p, p_end - p, 1); + } + } else { + if (cc_ok) { + write_section_data(s, tss, + p, p_end - p, 0); + } + } + } else { + tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque, + p, p_end - p, is_start); + } +} + +static int handle_packets(AVFormatContext *s, int nb_packets) +{ + MpegTSContext *ts = s->priv_data; + ByteIOContext *pb = &s->pb; + uint8_t packet[TS_FEC_PACKET_SIZE]; + int packet_num, len; + + ts->stop_parse = 0; + packet_num = 0; for(;;) { + if (ts->stop_parse) + break; + packet_num++; + if (nb_packets != 0 && packet_num >= nb_packets) + break; len = get_buffer(pb, packet, ts->raw_packet_size); if (len != ts->raw_packet_size) return AVERROR_IO; @@ -248,45 +819,93 @@ static int mpegts_read_packet(AVFormatContext *s, /* XXX: accept to resync ? */ if (packet[0] != 0x47) return AVERROR_INVALIDDATA; - - pid = ((packet[1] & 0x1f) << 8) | packet[2]; - tss = ts->pids[pid]; - if (tss == NULL) { - /* if no pid found, then add a pid context */ - tss = av_mallocz(sizeof(MpegTSStream)); - if (!tss) - continue; - ts->pids[pid] = tss; - tss->pid = pid; - tss->last_cc = -1; - // printf("new pid=0x%x\n", pid); - } + handle_packet(s, packet); + } + return 0; +} - /* continuity check (currently not used) */ - cc = (packet[3] & 0xf); - cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc)); - tss->last_cc = cc; - - /* skip adaptation field */ - afc = (packet[3] >> 4) & 3; - p = packet + 4; - if (afc == 0) /* reserved value */ - continue; - if (afc == 2) /* adaptation field only */ - continue; - if (afc == 3) { - /* skip adapation field */ - p += p[0] + 1; - } - /* if past the end of packet, ignore */ - if (p >= packet + TS_PACKET_SIZE) - continue; +static int mpegts_probe(AVProbeData *p) +{ + int size; + size = get_packet_size(p->buf, p->buf_size); + if (size < 0) + return 0; + return AVPROBE_SCORE_MAX - 1; +} + +void set_service_cb(void *opaque, int ret) +{ + MpegTSContext *ts = opaque; + ts->set_service_ret = ret; + ts->stop_parse = 1; +} + +static int mpegts_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + MpegTSContext *ts = s->priv_data; + ByteIOContext *pb = &s->pb; + uint8_t buf[1024]; + int len; + int64_t pos; + MpegTSService *service; - if (mpegts_push_data(s, tss, pkt, p, TS_PACKET_SIZE - (p - packet), - packet[1] & 0x40)) - break; + /* read the first 1024 bytes to get packet size */ + pos = url_ftell(pb); + len = get_buffer(pb, buf, sizeof(buf)); + if (len != sizeof(buf)) + goto fail; + ts->raw_packet_size = get_packet_size(buf, sizeof(buf)); + if (ts->raw_packet_size <= 0) + goto fail; + ts->auto_guess = 0; + + if (!ts->auto_guess) { + + /* first do a scaning to get all the services */ + url_fseek(pb, pos, SEEK_SET); + mpegts_scan_sdt(ts); + + handle_packets(s, MAX_SCAN_PACKETS); + + /* if no service found, no need to do anything */ + if (ts->nb_services <= 0) + return -1; + + /* now find the info for the first service */ + + url_fseek(pb, pos, SEEK_SET); + service = ts->services[0]; +#ifdef DEBUG_SI + printf("tuning to '%s'\n", service->name); +#endif + /* tune to first service found */ + ts->stream = s; + mpegts_set_service(ts, service->sid, set_service_cb, ts); + + handle_packets(s, MAX_SCAN_PACKETS); + + /* if could not find service, exit */ + if (ts->set_service_ret != 0) + return -1; + +#ifdef DEBUG_SI + printf("tuning done\n"); +#endif } + + url_fseek(pb, pos, SEEK_SET); return 0; + fail: + return -1; +} + +static int mpegts_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + MpegTSContext *ts = s->priv_data; + ts->pkt = pkt; + return handle_packets(s, 0); } static int mpegts_read_close(AVFormatContext *s) @@ -312,5 +931,6 @@ AVInputFormat mpegts_demux = { int mpegts_init(void) { av_register_input_format(&mpegts_demux); + av_register_output_format(&mpegts_mux); return 0; } diff --git a/libavformat/mpegts.h b/libavformat/mpegts.h new file mode 100644 index 0000000000..df0b6de216 --- /dev/null +++ b/libavformat/mpegts.h @@ -0,0 +1,40 @@ +/* + * MPEG2 transport stream defines + * 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 + */ + +#define TS_FEC_PACKET_SIZE 204 +#define TS_PACKET_SIZE 188 +#define NB_PID_MAX 8192 +#define MAX_SECTION_SIZE 4096 + +/* pids */ +#define PAT_PID 0x0000 +#define SDT_PID 0x0011 + +/* table ids */ +#define PAT_TID 0x00 +#define PMT_TID 0x02 +#define SDT_TID 0x42 + +#define STREAM_TYPE_VIDEO 0x02 +#define STREAM_TYPE_AUDIO 0x03 +#define STREAM_TYPE_PRIVATE_SECTION 0x05 +#define STREAM_TYPE_PRIVATE_DATA 0x06 + +unsigned int mpegts_crc32(const uint8_t *data, int len); +extern AVOutputFormat mpegts_mux; diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c new file mode 100644 index 0000000000..079f4c724c --- /dev/null +++ b/libavformat/mpegtsenc.c @@ -0,0 +1,582 @@ +/* + * 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 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> 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 + +/* 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 packet_index; + int pes_packet_count; + uint8_t packet[TS_PACKET_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_type) { + case CODEC_TYPE_VIDEO: + stream_type = STREAM_TYPE_VIDEO; + break; + case CODEC_TYPE_AUDIO: + stream_type = STREAM_TYPE_AUDIO; + 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; + /* 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]); + } + } +} + +static int mpegts_write_packet(AVFormatContext *s, int stream_index, + uint8_t *buf, int size, int pts1) +{ + AVStream *st = s->streams[stream_index]; + MpegTSWriteStream *ts_st = st->priv_data; + uint8_t *q; + int val, write_pts, is_start, len; + int64_t pts; + + while (size > 0) { + if (ts_st->packet_index == 0) { + retransmit_si_info(s); + + /* new PES header ? */ + is_start = 0; + if (++ts_st->pes_packet_count == DEFAULT_PES_HEADER_FREQ) { + ts_st->pes_packet_count = 0; + is_start = 1; + } + /* prepare packet header */ + q = ts_st->packet; + *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; + *q++ = 0; /* unbounded size */ + *q++ = 0; + *q++ = 0x80; + write_pts = 0; /* XXX: enable it */ + if (write_pts) { + *q++ = 0x80; /* PTS only */ + *q++ = 0x05; /* header len */ + pts = pts1; + 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; + } + } + ts_st->packet_index = q - ts_st->packet; + } + len = TS_PACKET_SIZE - ts_st->packet_index; + if (len == 0) { + put_buffer(&s->pb, ts_st->packet, TS_PACKET_SIZE); + ts_st->packet_index = 0; + } else { + if (len > size) + len = size; + memcpy(ts_st->packet + ts_st->packet_index, buf, len); + size -= len; + buf += len; + ts_st->packet_index += len; + } + } + put_flush_packet(&s->pb); + 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->packet_index != 0) { + /* put a known value at the end */ + memset(ts_st->packet + ts_st->packet_index, 0xff, + TS_PACKET_SIZE - ts_st->packet_index); + put_buffer(&s->pb, ts_st->packet, TS_PACKET_SIZE); + } + } + 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_MPEG1VIDEO, + mpegts_write_header, + mpegts_write_packet, + mpegts_write_end, +}; -- cgit v1.2.3