696 lines
20 KiB
C
696 lines
20 KiB
C
/*
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* MPEG2 transport stream (aka DVB) muxer
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* Copyright (c) 2003 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "crc.h"
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#include "mpegts.h"
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/* write DVB SI sections */
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/*********************************************/
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/* mpegts section writer */
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typedef struct MpegTSSection {
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int pid;
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int cc;
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void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
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void *opaque;
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} MpegTSSection;
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/* NOTE: 4 bytes must be left at the end for the crc32 */
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static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
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{
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unsigned int crc;
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unsigned char packet[TS_PACKET_SIZE];
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const unsigned char *buf_ptr;
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unsigned char *q;
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int first, b, len1, left;
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crc = bswap_32(av_crc(av_crc04C11DB7, -1, buf, len - 4));
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buf[len - 4] = (crc >> 24) & 0xff;
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buf[len - 3] = (crc >> 16) & 0xff;
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buf[len - 2] = (crc >> 8) & 0xff;
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buf[len - 1] = (crc) & 0xff;
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/* send each packet */
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buf_ptr = buf;
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while (len > 0) {
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first = (buf == buf_ptr);
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q = packet;
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*q++ = 0x47;
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b = (s->pid >> 8);
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if (first)
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b |= 0x40;
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*q++ = b;
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*q++ = s->pid;
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s->cc = (s->cc + 1) & 0xf;
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*q++ = 0x10 | s->cc;
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if (first)
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*q++ = 0; /* 0 offset */
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len1 = TS_PACKET_SIZE - (q - packet);
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if (len1 > len)
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len1 = len;
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memcpy(q, buf_ptr, len1);
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q += len1;
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/* add known padding data */
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left = TS_PACKET_SIZE - (q - packet);
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if (left > 0)
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memset(q, 0xff, left);
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s->write_packet(s, packet);
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buf_ptr += len1;
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len -= len1;
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}
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}
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static inline void put16(uint8_t **q_ptr, int val)
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{
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uint8_t *q;
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q = *q_ptr;
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*q++ = val >> 8;
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*q++ = val;
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*q_ptr = q;
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}
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static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
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int version, int sec_num, int last_sec_num,
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uint8_t *buf, int len)
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{
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uint8_t section[1024], *q;
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unsigned int tot_len;
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tot_len = 3 + 5 + len + 4;
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/* check if not too big */
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if (tot_len > 1024)
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return -1;
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q = section;
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*q++ = tid;
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put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
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put16(&q, id);
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*q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
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*q++ = sec_num;
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*q++ = last_sec_num;
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memcpy(q, buf, len);
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mpegts_write_section(s, section, tot_len);
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return 0;
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}
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/*********************************************/
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/* mpegts writer */
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#define DEFAULT_PMT_START_PID 0x1000
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#define DEFAULT_START_PID 0x0100
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#define DEFAULT_PROVIDER_NAME "FFmpeg"
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#define DEFAULT_SERVICE_NAME "Service01"
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/* default network id, transport stream and service identifiers */
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#define DEFAULT_ONID 0x0001
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#define DEFAULT_TSID 0x0001
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#define DEFAULT_SID 0x0001
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/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
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#define DEFAULT_PES_HEADER_FREQ 16
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#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
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/* we retransmit the SI info at this rate */
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#define SDT_RETRANS_TIME 500
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#define PAT_RETRANS_TIME 100
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#define PCR_RETRANS_TIME 20
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typedef struct MpegTSWriteStream {
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struct MpegTSService *service;
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int pid; /* stream associated pid */
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int cc;
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int payload_index;
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int64_t payload_pts;
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int64_t payload_dts;
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uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
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} MpegTSWriteStream;
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typedef struct MpegTSService {
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MpegTSSection pmt; /* MPEG2 pmt table context */
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int sid; /* service ID */
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char *name;
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char *provider_name;
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int pcr_pid;
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int pcr_packet_count;
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int pcr_packet_freq;
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} MpegTSService;
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typedef struct MpegTSWrite {
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MpegTSSection pat; /* MPEG2 pat table */
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MpegTSSection sdt; /* MPEG2 sdt table context */
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MpegTSService **services;
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int sdt_packet_count;
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int sdt_packet_freq;
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int pat_packet_count;
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int pat_packet_freq;
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int nb_services;
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int onid;
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int tsid;
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} MpegTSWrite;
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static void mpegts_write_pat(AVFormatContext *s)
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{
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MpegTSWrite *ts = s->priv_data;
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MpegTSService *service;
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uint8_t data[1012], *q;
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int i;
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q = data;
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for(i = 0; i < ts->nb_services; i++) {
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service = ts->services[i];
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put16(&q, service->sid);
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put16(&q, 0xe000 | service->pmt.pid);
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}
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mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
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data, q - data);
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}
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static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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{
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// MpegTSWrite *ts = s->priv_data;
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uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
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int val, stream_type, i;
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q = data;
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put16(&q, 0xe000 | service->pcr_pid);
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program_info_length_ptr = q;
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q += 2; /* patched after */
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/* put program info here */
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val = 0xf000 | (q - program_info_length_ptr - 2);
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program_info_length_ptr[0] = val >> 8;
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program_info_length_ptr[1] = val;
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for(i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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MpegTSWriteStream *ts_st = st->priv_data;
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switch(st->codec->codec_id) {
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case CODEC_ID_MPEG1VIDEO:
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case CODEC_ID_MPEG2VIDEO:
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stream_type = STREAM_TYPE_VIDEO_MPEG2;
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break;
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case CODEC_ID_MPEG4:
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stream_type = STREAM_TYPE_VIDEO_MPEG4;
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break;
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case CODEC_ID_H264:
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stream_type = STREAM_TYPE_VIDEO_H264;
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break;
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case CODEC_ID_MP2:
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case CODEC_ID_MP3:
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stream_type = STREAM_TYPE_AUDIO_MPEG1;
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break;
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case CODEC_ID_AAC:
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stream_type = STREAM_TYPE_AUDIO_AAC;
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break;
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case CODEC_ID_AC3:
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stream_type = STREAM_TYPE_AUDIO_AC3;
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break;
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default:
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stream_type = STREAM_TYPE_PRIVATE_DATA;
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break;
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}
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*q++ = stream_type;
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put16(&q, 0xe000 | ts_st->pid);
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desc_length_ptr = q;
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q += 2; /* patched after */
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/* write optional descriptors here */
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switch(st->codec->codec_type) {
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case CODEC_TYPE_AUDIO:
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if (strlen(st->language) == 3) {
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*q++ = 0x0a; /* ISO 639 language descriptor */
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*q++ = 4;
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*q++ = st->language[0];
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*q++ = st->language[1];
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*q++ = st->language[2];
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*q++ = 0; /* undefined type */
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}
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break;
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case CODEC_TYPE_SUBTITLE:
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{
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const char *language;
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language = st->language;
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if (strlen(language) != 3)
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language = "eng";
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*q++ = 0x59;
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*q++ = 8;
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*q++ = language[0];
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*q++ = language[1];
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*q++ = language[2];
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*q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
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put16(&q, 1); /* page id */
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put16(&q, 1); /* ancillary page id */
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}
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break;
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}
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val = 0xf000 | (q - desc_length_ptr - 2);
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desc_length_ptr[0] = val >> 8;
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desc_length_ptr[1] = val;
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}
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mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
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data, q - data);
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}
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/* NOTE: str == NULL is accepted for an empty string */
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static void putstr8(uint8_t **q_ptr, const char *str)
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{
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uint8_t *q;
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int len;
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q = *q_ptr;
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if (!str)
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len = 0;
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else
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len = strlen(str);
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*q++ = len;
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memcpy(q, str, len);
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q += len;
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*q_ptr = q;
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}
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static void mpegts_write_sdt(AVFormatContext *s)
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{
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MpegTSWrite *ts = s->priv_data;
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MpegTSService *service;
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uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
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int i, running_status, free_ca_mode, val;
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q = data;
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put16(&q, ts->onid);
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*q++ = 0xff;
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for(i = 0; i < ts->nb_services; i++) {
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service = ts->services[i];
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put16(&q, service->sid);
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*q++ = 0xfc | 0x00; /* currently no EIT info */
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desc_list_len_ptr = q;
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q += 2;
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running_status = 4; /* running */
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free_ca_mode = 0;
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/* write only one descriptor for the service name and provider */
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*q++ = 0x48;
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desc_len_ptr = q;
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q++;
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*q++ = 0x01; /* digital television service */
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putstr8(&q, service->provider_name);
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putstr8(&q, service->name);
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desc_len_ptr[0] = q - desc_len_ptr - 1;
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/* fill descriptor length */
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val = (running_status << 13) | (free_ca_mode << 12) |
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(q - desc_list_len_ptr - 2);
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desc_list_len_ptr[0] = val >> 8;
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desc_list_len_ptr[1] = val;
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}
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mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
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data, q - data);
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}
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static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
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int sid,
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const char *provider_name,
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const char *name)
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{
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MpegTSService *service;
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service = av_mallocz(sizeof(MpegTSService));
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if (!service)
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return NULL;
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service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
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service->sid = sid;
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service->provider_name = av_strdup(provider_name);
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service->name = av_strdup(name);
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service->pcr_pid = 0x1fff;
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dynarray_add(&ts->services, &ts->nb_services, service);
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return service;
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}
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static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
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{
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AVFormatContext *ctx = s->opaque;
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put_buffer(&ctx->pb, packet, TS_PACKET_SIZE);
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}
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static int mpegts_write_header(AVFormatContext *s)
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{
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MpegTSWrite *ts = s->priv_data;
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MpegTSWriteStream *ts_st;
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MpegTSService *service;
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AVStream *st;
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int i, total_bit_rate;
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const char *service_name;
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ts->tsid = DEFAULT_TSID;
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ts->onid = DEFAULT_ONID;
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/* allocate a single DVB service */
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service_name = s->title;
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if (service_name[0] == '\0')
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service_name = DEFAULT_SERVICE_NAME;
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service = mpegts_add_service(ts, DEFAULT_SID,
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DEFAULT_PROVIDER_NAME, service_name);
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service->pmt.write_packet = section_write_packet;
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service->pmt.opaque = s;
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ts->pat.pid = PAT_PID;
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ts->pat.cc = 0;
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ts->pat.write_packet = section_write_packet;
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ts->pat.opaque = s;
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ts->sdt.pid = SDT_PID;
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ts->sdt.cc = 0;
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ts->sdt.write_packet = section_write_packet;
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ts->sdt.opaque = s;
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/* assign pids to each stream */
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total_bit_rate = 0;
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for(i = 0;i < s->nb_streams; i++) {
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st = s->streams[i];
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ts_st = av_mallocz(sizeof(MpegTSWriteStream));
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if (!ts_st)
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goto fail;
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st->priv_data = ts_st;
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ts_st->service = service;
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ts_st->pid = DEFAULT_START_PID + i;
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ts_st->payload_pts = AV_NOPTS_VALUE;
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ts_st->payload_dts = AV_NOPTS_VALUE;
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/* update PCR pid by using the first video stream */
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if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
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service->pcr_pid == 0x1fff)
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service->pcr_pid = ts_st->pid;
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total_bit_rate += st->codec->bit_rate;
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}
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/* if no video stream, use the first stream as PCR */
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if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
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ts_st = s->streams[0]->priv_data;
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service->pcr_pid = ts_st->pid;
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}
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if (total_bit_rate <= 8 * 1024)
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total_bit_rate = 8 * 1024;
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service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
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(TS_PACKET_SIZE * 8 * 1000);
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ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
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(TS_PACKET_SIZE * 8 * 1000);
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ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
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(TS_PACKET_SIZE * 8 * 1000);
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#if 0
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printf("%d %d %d\n",
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total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
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#endif
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/* write info at the start of the file, so that it will be fast to
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find them */
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mpegts_write_sdt(s);
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mpegts_write_pat(s);
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for(i = 0; i < ts->nb_services; i++) {
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mpegts_write_pmt(s, ts->services[i]);
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}
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put_flush_packet(&s->pb);
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return 0;
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fail:
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for(i = 0;i < s->nb_streams; i++) {
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st = s->streams[i];
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av_free(st->priv_data);
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}
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return -1;
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}
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/* send SDT, PAT and PMT tables regulary */
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static void retransmit_si_info(AVFormatContext *s)
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{
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MpegTSWrite *ts = s->priv_data;
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int i;
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if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
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ts->sdt_packet_count = 0;
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mpegts_write_sdt(s);
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}
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if (++ts->pat_packet_count == ts->pat_packet_freq) {
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ts->pat_packet_count = 0;
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mpegts_write_pat(s);
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for(i = 0; i < ts->nb_services; i++) {
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mpegts_write_pmt(s, ts->services[i]);
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}
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}
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}
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static void write_pts(uint8_t *q, int fourbits, int64_t pts)
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{
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int val;
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val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
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*q++ = val;
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val = (((pts >> 15) & 0x7fff) << 1) | 1;
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*q++ = val >> 8;
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*q++ = val;
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val = (((pts) & 0x7fff) << 1) | 1;
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*q++ = val >> 8;
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*q++ = val;
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}
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/* NOTE: pes_data contains all the PES packet */
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static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
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const uint8_t *payload, int payload_size,
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int64_t pts, int64_t dts)
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{
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MpegTSWriteStream *ts_st = st->priv_data;
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uint8_t buf[TS_PACKET_SIZE];
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uint8_t *q;
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int val, is_start, len, header_len, write_pcr, private_code, flags;
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int afc_len, stuffing_len;
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int64_t pcr = -1; /* avoid warning */
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is_start = 1;
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while (payload_size > 0) {
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retransmit_si_info(s);
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write_pcr = 0;
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if (ts_st->pid == ts_st->service->pcr_pid) {
|
|
ts_st->service->pcr_packet_count++;
|
|
if (ts_st->service->pcr_packet_count >=
|
|
ts_st->service->pcr_packet_freq) {
|
|
ts_st->service->pcr_packet_count = 0;
|
|
write_pcr = 1;
|
|
/* XXX: this is incorrect, but at least we have a PCR
|
|
value */
|
|
pcr = pts;
|
|
}
|
|
}
|
|
|
|
/* prepare packet header */
|
|
q = buf;
|
|
*q++ = 0x47;
|
|
val = (ts_st->pid >> 8);
|
|
if (is_start)
|
|
val |= 0x40;
|
|
*q++ = val;
|
|
*q++ = ts_st->pid;
|
|
*q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
|
|
ts_st->cc = (ts_st->cc + 1) & 0xf;
|
|
if (write_pcr) {
|
|
*q++ = 7; /* AFC length */
|
|
*q++ = 0x10; /* flags: PCR present */
|
|
*q++ = pcr >> 25;
|
|
*q++ = pcr >> 17;
|
|
*q++ = pcr >> 9;
|
|
*q++ = pcr >> 1;
|
|
*q++ = (pcr & 1) << 7;
|
|
*q++ = 0;
|
|
}
|
|
if (is_start) {
|
|
/* write PES header */
|
|
*q++ = 0x00;
|
|
*q++ = 0x00;
|
|
*q++ = 0x01;
|
|
private_code = 0;
|
|
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
|
*q++ = 0xe0;
|
|
} else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
|
|
(st->codec->codec_id == CODEC_ID_MP2 ||
|
|
st->codec->codec_id == CODEC_ID_MP3)) {
|
|
*q++ = 0xc0;
|
|
} else {
|
|
*q++ = 0xbd;
|
|
if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
|
|
private_code = 0x20;
|
|
}
|
|
}
|
|
header_len = 0;
|
|
flags = 0;
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
header_len += 5;
|
|
flags |= 0x80;
|
|
}
|
|
if (dts != AV_NOPTS_VALUE) {
|
|
header_len += 5;
|
|
flags |= 0x40;
|
|
}
|
|
len = payload_size + header_len + 3;
|
|
if (private_code != 0)
|
|
len++;
|
|
*q++ = len >> 8;
|
|
*q++ = len;
|
|
val = 0x80;
|
|
/* data alignment indicator is required for subtitle data */
|
|
if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
|
|
val |= 0x04;
|
|
*q++ = val;
|
|
*q++ = flags;
|
|
*q++ = header_len;
|
|
if (pts != AV_NOPTS_VALUE) {
|
|
write_pts(q, flags >> 6, pts);
|
|
q += 5;
|
|
}
|
|
if (dts != AV_NOPTS_VALUE) {
|
|
write_pts(q, 1, dts);
|
|
q += 5;
|
|
}
|
|
if (private_code != 0)
|
|
*q++ = private_code;
|
|
is_start = 0;
|
|
}
|
|
/* header size */
|
|
header_len = q - buf;
|
|
/* data len */
|
|
len = TS_PACKET_SIZE - header_len;
|
|
if (len > payload_size)
|
|
len = payload_size;
|
|
stuffing_len = TS_PACKET_SIZE - header_len - len;
|
|
if (stuffing_len > 0) {
|
|
/* add stuffing with AFC */
|
|
if (buf[3] & 0x20) {
|
|
/* stuffing already present: increase its size */
|
|
afc_len = buf[4] + 1;
|
|
memmove(buf + 4 + afc_len + stuffing_len,
|
|
buf + 4 + afc_len,
|
|
header_len - (4 + afc_len));
|
|
buf[4] += stuffing_len;
|
|
memset(buf + 4 + afc_len, 0xff, stuffing_len);
|
|
} else {
|
|
/* add stuffing */
|
|
memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
|
|
buf[3] |= 0x20;
|
|
buf[4] = stuffing_len - 1;
|
|
if (stuffing_len >= 2) {
|
|
buf[5] = 0x00;
|
|
memset(buf + 6, 0xff, stuffing_len - 2);
|
|
}
|
|
}
|
|
}
|
|
memcpy(buf + TS_PACKET_SIZE - len, payload, len);
|
|
payload += len;
|
|
payload_size -= len;
|
|
put_buffer(&s->pb, buf, TS_PACKET_SIZE);
|
|
}
|
|
put_flush_packet(&s->pb);
|
|
}
|
|
|
|
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVStream *st = s->streams[pkt->stream_index];
|
|
int size= pkt->size;
|
|
uint8_t *buf= pkt->data;
|
|
MpegTSWriteStream *ts_st = st->priv_data;
|
|
int len, max_payload_size;
|
|
|
|
if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
|
|
/* for subtitle, a single PES packet must be generated */
|
|
mpegts_write_pes(s, st, buf, size, pkt->pts, AV_NOPTS_VALUE);
|
|
return 0;
|
|
}
|
|
|
|
max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
|
|
while (size > 0) {
|
|
len = max_payload_size - ts_st->payload_index;
|
|
if (len > size)
|
|
len = size;
|
|
memcpy(ts_st->payload + ts_st->payload_index, buf, len);
|
|
buf += len;
|
|
size -= len;
|
|
ts_st->payload_index += len;
|
|
if (ts_st->payload_pts == AV_NOPTS_VALUE)
|
|
ts_st->payload_pts = pkt->pts;
|
|
if (ts_st->payload_dts == AV_NOPTS_VALUE)
|
|
ts_st->payload_dts = pkt->dts;
|
|
if (ts_st->payload_index >= max_payload_size) {
|
|
mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
|
|
ts_st->payload_pts, ts_st->payload_dts);
|
|
ts_st->payload_pts = AV_NOPTS_VALUE;
|
|
ts_st->payload_dts = AV_NOPTS_VALUE;
|
|
ts_st->payload_index = 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int mpegts_write_end(AVFormatContext *s)
|
|
{
|
|
MpegTSWrite *ts = s->priv_data;
|
|
MpegTSWriteStream *ts_st;
|
|
MpegTSService *service;
|
|
AVStream *st;
|
|
int i;
|
|
|
|
/* flush current packets */
|
|
for(i = 0; i < s->nb_streams; i++) {
|
|
st = s->streams[i];
|
|
ts_st = st->priv_data;
|
|
if (ts_st->payload_index > 0) {
|
|
mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
|
|
ts_st->payload_pts, ts_st->payload_dts);
|
|
}
|
|
}
|
|
put_flush_packet(&s->pb);
|
|
|
|
for(i = 0; i < ts->nb_services; i++) {
|
|
service = ts->services[i];
|
|
av_freep(&service->provider_name);
|
|
av_freep(&service->name);
|
|
av_free(service);
|
|
}
|
|
av_free(ts->services);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat mpegts_muxer = {
|
|
"mpegts",
|
|
"MPEG2 transport stream format",
|
|
"video/x-mpegts",
|
|
"ts",
|
|
sizeof(MpegTSWrite),
|
|
CODEC_ID_MP2,
|
|
CODEC_ID_MPEG2VIDEO,
|
|
mpegts_write_header,
|
|
mpegts_write_packet,
|
|
mpegts_write_end,
|
|
};
|