/*
- * MPEG2 transport stream (aka DVB) demux
- * Copyright (c) 2002 Fabrice Bellard.
+ * MPEG2 transport stream (aka DVB) demuxer
+ * Copyright (c) 2002-2003 Fabrice Bellard.
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+
+#include "libavutil/crc.h"
#include "avformat.h"
+#include "mpegts.h"
+
+//#define DEBUG_SI
+//#define DEBUG_SEEK
+
+/* 1.0 second at 24Mbit/s */
+#define MAX_SCAN_PACKETS 32000
+
+/* maximum size in which we look for synchronisation if
+ synchronisation is lost */
+#define MAX_RESYNC_SIZE 4096
+#define REGISTRATION_DESCRIPTOR 5
+
+typedef struct PESContext PESContext;
+
+static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
+static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
+extern void av_set_program_name(AVProgram *program, char *provider_name, char *name);
+extern void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
+
+enum MpegTSFilterType {
+ MPEGTS_PES,
+ MPEGTS_SECTION,
+};
+
+typedef struct MpegTSFilter MpegTSFilter;
+
+typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start);
+
+typedef struct MpegTSPESFilter {
+ PESCallback *pes_cb;
+ void *opaque;
+} MpegTSPESFilter;
+
+typedef void SectionCallback(MpegTSFilter *f, 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;
+ unsigned int check_crc:1;
+ unsigned int end_of_section_reached:1;
+ SectionCallback *section_cb;
+ void *opaque;
+} MpegTSSectionFilter;
+
+struct MpegTSFilter {
+ int pid;
+ int last_cc; /* last cc code (-1 if first packet) */
+ enum MpegTSFilterType type;
+ union {
+ MpegTSPESFilter pes_filter;
+ MpegTSSectionFilter section_filter;
+ } u;
+};
+
+#define MAX_PIDS_PER_PROGRAM 64
+typedef struct {
+ unsigned int id; //program id/service id
+ unsigned int nb_pids;
+ unsigned int pids[MAX_PIDS_PER_PROGRAM];
+} Program_t;
+
+struct MpegTSContext {
+ /* user data */
+ AVFormatContext *stream;
+ /** raw packet size, including FEC if present */
+ int raw_packet_size;
+
+ int pos47;
+
+ /** if true, all pids are analyzed to find streams */
+ int auto_guess;
+
+ /** compute exact PCR for each transport stream packet */
+ int mpeg2ts_compute_pcr;
+
+ int64_t cur_pcr; /**< used to estimate the exact PCR */
+ int pcr_incr; /**< used to estimate the exact PCR */
+
+ /* data needed to handle file based ts */
+ /** stop parsing loop */
+ int stop_parse;
+ /** packet containing Audio/Video data */
+ AVPacket *pkt;
+
+ /******************************************/
+ /* private mpegts data */
+ /* scan context */
+ /** structure to keep track of Program->pids mapping */
+ unsigned int nb_prg;
+ Program_t *prg;
-#define TS_FEC_PACKET_SIZE 204
-#define TS_PACKET_SIZE 188
-#define NB_PID_MAX 8192
+
+ /** filters for various streams specified by PMT + for the PAT and PMT */
+ MpegTSFilter *pids[NB_PID_MAX];
+};
+
+/* TS stream handling */
enum MpegTSState {
MPEGTS_HEADER = 0,
MPEGTS_PESHEADER_FILL,
- MPEGTS_PESHEADER_FLAGS,
- MPEGTS_PESHEADER_SIZE,
- MPEGTS_PESHEADER_READ,
MPEGTS_PAYLOAD,
MPEGTS_SKIP,
};
/* enough for PES header + length */
-#define MAX_HEADER_SIZE 6
+#define PES_START_SIZE 9
+#define MAX_PES_HEADER_SIZE (9 + 255)
-typedef struct MpegTSStream {
+struct PESContext {
int pid;
+ int pcr_pid; /**< if -1 then all packets containing PCR are considered */
+ int stream_type;
+ MpegTSContext *ts;
+ AVFormatContext *stream;
+ AVStream *st;
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 data_index;
+ int total_size;
int pes_header_size;
- AVStream *st;
- unsigned char header[MAX_HEADER_SIZE];
-} MpegTSStream;
+ int64_t pts, dts;
+ uint8_t header[MAX_PES_HEADER_SIZE];
+};
-typedef struct MpegTSContext {
- int raw_packet_size; /* raw packet size, including FEC if present */
- MpegTSStream *pids[NB_PID_MAX];
-} MpegTSContext;
+extern AVInputFormat mpegts_demuxer;
-/* autodetect fec presence. Must have at least 1024 bytes */
-static int get_packet_size(const unsigned char *buf, int size)
+static void clear_program(MpegTSContext *ts, unsigned int programid)
{
int i;
- if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
- return -1;
- for(i=0;i<5;i++) {
- if (buf[i * TS_PACKET_SIZE] != 0x47)
- goto try_fec;
+ for(i=0; i<ts->nb_prg; i++)
+ if(ts->prg[i].id == programid)
+ ts->prg[i].nb_pids = 0;
+}
+
+static void clear_programs(MpegTSContext *ts)
+{
+ av_freep(&ts->prg);
+ ts->nb_prg=0;
+}
+
+static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
+{
+ Program_t *p;
+ void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(Program_t));
+ if(!tmp)
+ return;
+ ts->prg = tmp;
+ p = &ts->prg[ts->nb_prg];
+ p->id = programid;
+ p->nb_pids = 0;
+ ts->nb_prg++;
+}
+
+static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
+{
+ int i;
+ Program_t *p = NULL;
+ for(i=0; i<ts->nb_prg; i++) {
+ if(ts->prg[i].id == programid) {
+ p = &ts->prg[i];
+ break;
+ }
}
- return TS_PACKET_SIZE;
- try_fec:
- for(i=0;i<5;i++) {
- if (buf[i * TS_FEC_PACKET_SIZE] != 0x47)
- return -1;
+ if(!p)
+ return;
+
+ if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
+ return;
+ p->pids[p->nb_pids++] = pid;
+}
+
+/**
+ * \brief discard_pid() decides if the pid is to be discarded according
+ * to caller's programs selection
+ * \param ts : - TS context
+ * \param pid : - pid
+ * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
+ * 0 otherwise
+ */
+static int discard_pid(MpegTSContext *ts, unsigned int pid)
+{
+ int i, j, k;
+ int used = 0, discarded = 0;
+ Program_t *p;
+ for(i=0; i<ts->nb_prg; i++) {
+ p = &ts->prg[i];
+ for(j=0; j<p->nb_pids; j++) {
+ if(p->pids[j] != pid)
+ continue;
+ //is program with id p->id set to be discarded?
+ for(k=0; k<ts->stream->nb_programs; k++) {
+ if(ts->stream->programs[k]->id == p->id) {
+ if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
+ discarded++;
+ else
+ used++;
+ }
+ }
+ }
}
- return TS_FEC_PACKET_SIZE;
+
+ return !used && discarded;
}
-static int mpegts_probe(AVProbeData *p)
+/**
+ * Assembles PES packets out of TS packets, and then calls the "section_cb"
+ * function when they are complete.
+ */
+static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
+ const uint8_t *buf, int buf_size, int is_start)
{
- int size;
- size = get_packet_size(p->buf, p->buf_size);
- if (size < 0)
- return 0;
- return AVPROBE_SCORE_MAX;
+ MpegTSSectionFilter *tss = &tss1->u.section_filter;
+ int len;
+
+ 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 = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
+ if (len > 4096)
+ return;
+ tss->section_h_size = len;
+ }
+
+ if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
+ tss->end_of_section_reached = 1;
+ if (!tss->check_crc ||
+ av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
+ tss->section_buf, tss->section_h_size) == 0)
+ tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
+ }
}
-static int mpegts_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
+static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
+ SectionCallback *section_cb, void *opaque,
+ int check_crc)
+
+{
+ MpegTSFilter *filter;
+ MpegTSSectionFilter *sec;
+
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
+#endif
+ 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;
+}
+
+static 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;
+}
+
+static 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;
+}
+
+static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
+ int stat[packet_size];
+ int i;
+ int x=0;
+ int best_score=0;
+
+ memset(stat, 0, packet_size*sizeof(int));
+
+ for(x=i=0; i<size-3; i++){
+ if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
+ stat[x]++;
+ if(stat[x] > best_score){
+ best_score= stat[x];
+ if(index) *index= x;
+ }
+ }
+
+ x++;
+ if(x == packet_size) x= 0;
+ }
+
+ return best_score;
+}
+
+/* autodetect fec presence. Must have at least 1024 bytes */
+static int get_packet_size(const uint8_t *buf, int size)
+{
+ int score, fec_score, dvhs_score;
+
+ if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
+ return -1;
+
+ score = analyze(buf, size, TS_PACKET_SIZE, NULL);
+ dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
+ fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
+// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
+
+ if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
+ else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
+ else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
+ else return -1;
+}
+
+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)
+{
+ const uint8_t *p;
+ int c;
+
+ p = *pp;
+ if (p >= p_end)
+ return -1;
+ c = *p++;
+ *pp = p;
+ return c;
+}
+
+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 = AV_RB16(p);
+ 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;
}
-/* 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 pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
+ MpegTSContext *ts = filter->u.section_filter.opaque;
+ SectionHeader h1, *h = &h1;
+ PESContext *pes;
AVStream *st;
- const unsigned char *p;
- int len, code, codec_type, codec_id;
+ const uint8_t *p, *p_end, *desc_list_end, *desc_end;
+ int program_info_length, pcr_pid, pid, stream_type;
+ int desc_list_len, desc_len, desc_tag;
+ int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
+ char language[4] = {0}; /* initialize to kill warnings */
+ int has_hdmv_descr = 0;
+
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
+ av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (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
+ av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
+ h->id, h->sec_num, h->last_sec_num);
+#endif
+ if (h->tid != PMT_TID)
+ return;
+
+ clear_program(ts, h->id);
+ pcr_pid = get16(&p, p_end) & 0x1fff;
+ if (pcr_pid < 0)
+ return;
+ add_pid_to_pmt(ts, h->id, pcr_pid);
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
+#endif
+ program_info_length = get16(&p, p_end) & 0xfff;
+ if (program_info_length < 0)
+ return;
+ while(program_info_length >= 2) {
+ uint8_t tag, len;
+ tag = get8(&p, p_end);
+ len = get8(&p, p_end);
+ if(len > program_info_length - 2)
+ //something else is broken, exit the program_descriptors_loop
+ break;
+ program_info_length -= len + 2;
+ if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
+ uint8_t bytes[4];
+ bytes[0] = get8(&p, p_end);
+ bytes[1] = get8(&p, p_end);
+ bytes[2] = get8(&p, p_end);
+ bytes[3] = get8(&p, p_end);
+ len -= 4;
+ if(bytes[0] == 'H' && bytes[1] == 'D' &&
+ bytes[2] == 'M' && bytes[3] == 'V')
+ has_hdmv_descr = 1;
+ }
+ p += len;
+ }
+ p += program_info_length;
+ if (p >= p_end)
+ return;
+ for(;;) {
+ language[0] = 0;
+ st = 0;
+ stream_type = get8(&p, p_end);
+ if (stream_type < 0)
+ break;
+ pid = get16(&p, p_end) & 0x1fff;
+ if (pid < 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;
+ if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
+ if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
+ /*assume DVB AC-3 Audio*/
+ stream_type = STREAM_TYPE_AUDIO_AC3;
+ } else if(desc_tag == 0x7B) {
+ /* DVB DTS audio */
+ stream_type = STREAM_TYPE_AUDIO_DTS;
+ }
+ }
+ desc_len = get8(&p, desc_list_end);
+ desc_end = p + desc_len;
+ if (desc_end > desc_list_end)
+ break;
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
+ desc_tag, desc_len);
+#endif
+ switch(desc_tag) {
+ case DVB_SUBT_DESCID:
+ if (stream_type == STREAM_TYPE_PRIVATE_DATA)
+ stream_type = STREAM_TYPE_SUBTITLE_DVB;
+
+ language[0] = get8(&p, desc_end);
+ language[1] = get8(&p, desc_end);
+ language[2] = get8(&p, desc_end);
+ language[3] = 0;
+ get8(&p, desc_end);
+ comp_page = get16(&p, desc_end);
+ anc_page = get16(&p, desc_end);
+
+ break;
+ case 0x0a: /* ISO 639 language descriptor */
+ language[0] = get8(&p, desc_end);
+ language[1] = get8(&p, desc_end);
+ language[2] = get8(&p, desc_end);
+ language[3] = 0;
+ break;
+ default:
+ break;
+ }
+ p = desc_end;
+ }
+ p = desc_list_end;
+
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
+ stream_type, pid);
+#endif
+
+ /* now create ffmpeg stream */
+ switch(stream_type) {
+ case STREAM_TYPE_AUDIO_MPEG1:
+ case STREAM_TYPE_AUDIO_MPEG2:
+ case STREAM_TYPE_VIDEO_MPEG1:
+ case STREAM_TYPE_VIDEO_MPEG2:
+ case STREAM_TYPE_VIDEO_MPEG4:
+ case STREAM_TYPE_VIDEO_H264:
+ case STREAM_TYPE_VIDEO_VC1:
+ case STREAM_TYPE_AUDIO_AAC:
+ case STREAM_TYPE_AUDIO_AC3:
+ case STREAM_TYPE_AUDIO_DTS:
+ case STREAM_TYPE_AUDIO_HDMV_DTS:
+ case STREAM_TYPE_SUBTITLE_DVB:
+ if(stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
+ break;
+ if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
+ pes= ts->pids[pid]->u.pes_filter.opaque;
+ st= pes->st;
+ }else{
+ if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
+ pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
+ if (pes)
+ st = new_pes_av_stream(pes, 0);
+ }
+ add_pid_to_pmt(ts, h->id, pid);
+ if(st)
+ av_program_add_stream_index(ts->stream, h->id, st->index);
+ break;
+ default:
+ /* we ignore the other streams */
+ break;
+ }
+
+ if (st) {
+ if (language[0] != 0) {
+ memcpy(st->language, language, 4);
+ }
+
+ if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
+ st->codec->sub_id = (anc_page << 16) | comp_page;
+ }
+ }
+ }
+ /* all parameters are there */
+ ts->stop_parse++;
+ mpegts_close_filter(ts, filter);
+}
+
+static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
+{
+ MpegTSContext *ts = filter->u.section_filter.opaque;
+ SectionHeader h1, *h = &h1;
+ const uint8_t *p, *p_end;
+ int sid, pmt_pid;
+
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
+ av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (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;
+
+ clear_programs(ts);
+ 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
+ av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
+#endif
+ if (sid == 0x0000) {
+ /* NIT info */
+ } else {
+ av_new_program(ts->stream, sid);
+ ts->stop_parse--;
+ mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
+ add_pat_entry(ts, sid);
+ add_pid_to_pmt(ts, sid, 0); //add pat pid to program
+ add_pid_to_pmt(ts, sid, pmt_pid);
+ }
+ }
+ /* not found */
+ ts->stop_parse++;
+
+ mpegts_close_filter(ts, filter);
+}
+
+static void mpegts_set_service(MpegTSContext *ts)
+{
+ mpegts_open_section_filter(ts, PAT_PID,
+ pat_cb, ts, 1);
+}
+
+static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
+{
+ MpegTSContext *ts = filter->u.section_filter.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
+ av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
+ av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (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
+ av_log(ts->stream, AV_LOG_DEBUG, "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) {
+ AVProgram *program = av_new_program(ts->stream, sid);
+ if(program)
+ av_set_program_name(program, provider_name, name);
+ }
+ av_free(name);
+ av_free(provider_name);
+ break;
+ default:
+ break;
+ }
+ p = desc_end;
+ }
+ p = desc_list_end;
+ }
+}
+
+/* scan services in a transport stream by looking at the SDT */
+static void mpegts_scan_sdt(MpegTSContext *ts)
+{
+ mpegts_open_section_filter(ts, SDT_PID,
+ sdt_cb, ts, 1);
+}
+
+static int64_t get_pts(const uint8_t *p)
+{
+ int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
+ pts |= (AV_RB16(p + 1) >> 1) << 15;
+ pts |= AV_RB16(p + 3) >> 1;
+ return pts;
+}
+
+/* return non zero if a packet could be constructed */
+static void mpegts_push_data(MpegTSFilter *filter,
+ const uint8_t *buf, int buf_size, int is_start)
+{
+ PESContext *pes = filter->u.pes_filter.opaque;
+ MpegTSContext *ts = pes->ts;
+ const uint8_t *p;
+ int len, code;
+
+ if(!ts->pkt)
+ return;
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_log(pes->stream, AV_LOG_DEBUG, 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)))
+ (code >= 0x1e0 && code <= 0x1ef) ||
+ (code == 0x1bd) || (code == 0x1fd)))
goto skip;
- if (!tss->st) {
+ if (!pes->st) {
/* allocate stream */
- if (code >= 0x1c0 && code <= 0x1df) {
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MP2;
- } else {
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_MPEG1VIDEO;
- }
- st = av_new_stream(s, tss->pid);
- if (st) {
- st->priv_data = tss;
- st->codec.codec_type = codec_type;
- st->codec.codec_id = codec_id;
- tss->st = st;
- }
+ new_pes_av_stream(pes, code);
}
- 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 = AV_RB16(pes->header + 4);
+ /* 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;
}
}
/**********************************************/
/* 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;
+ pkt->dts = pes->dts;
+ /* 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;
break;
}
}
- return 0;
}
-static int mpegts_read_packet(AVFormatContext *s,
- AVPacket *pkt)
+static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
{
- 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;
-
+ AVStream *st;
+ int codec_type, codec_id;
+
+ switch(pes->stream_type){
+ case STREAM_TYPE_AUDIO_MPEG1:
+ case STREAM_TYPE_AUDIO_MPEG2:
+ codec_type = CODEC_TYPE_AUDIO;
+ codec_id = CODEC_ID_MP3;
+ break;
+ case STREAM_TYPE_VIDEO_MPEG1:
+ case STREAM_TYPE_VIDEO_MPEG2:
+ codec_type = CODEC_TYPE_VIDEO;
+ codec_id = CODEC_ID_MPEG2VIDEO;
+ break;
+ case STREAM_TYPE_VIDEO_MPEG4:
+ codec_type = CODEC_TYPE_VIDEO;
+ codec_id = CODEC_ID_MPEG4;
+ break;
+ case STREAM_TYPE_VIDEO_H264:
+ codec_type = CODEC_TYPE_VIDEO;
+ codec_id = CODEC_ID_H264;
+ break;
+ case STREAM_TYPE_VIDEO_VC1:
+ codec_type = CODEC_TYPE_VIDEO;
+ codec_id = CODEC_ID_VC1;
+ break;
+ case STREAM_TYPE_AUDIO_AAC:
+ codec_type = CODEC_TYPE_AUDIO;
+ codec_id = CODEC_ID_AAC;
+ break;
+ case STREAM_TYPE_AUDIO_AC3:
+ codec_type = CODEC_TYPE_AUDIO;
+ codec_id = CODEC_ID_AC3;
+ break;
+ case STREAM_TYPE_AUDIO_DTS:
+ case STREAM_TYPE_AUDIO_HDMV_DTS:
+ codec_type = CODEC_TYPE_AUDIO;
+ codec_id = CODEC_ID_DTS;
+ break;
+ case STREAM_TYPE_SUBTITLE_DVB:
+ codec_type = CODEC_TYPE_SUBTITLE;
+ codec_id = CODEC_ID_DVB_SUBTITLE;
+ break;
+ default:
+ if (code >= 0x1c0 && code <= 0x1df) {
+ codec_type = CODEC_TYPE_AUDIO;
+ codec_id = CODEC_ID_MP2;
+ } else if (code == 0x1bd) {
+ codec_type = CODEC_TYPE_AUDIO;
+ codec_id = CODEC_ID_AC3;
+ } else {
+ codec_type = CODEC_TYPE_VIDEO;
+ codec_id = CODEC_ID_PROBE;
+ }
+ break;
+ }
+ st = av_new_stream(pes->stream, pes->pid);
+ if (st) {
+ av_set_pts_info(st, 33, 1, 90000);
+ st->priv_data = pes;
+ st->codec->codec_type = codec_type;
+ st->codec->codec_id = codec_id;
+ st->need_parsing = AVSTREAM_PARSE_FULL;
+ pes->st = st;
+ }
+ return st;
+}
+
+
+static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
+{
+ MpegTSFilter *tss;
+ PESContext *pes;
+
+ /* if no pid found, then add a pid context */
+ pes = av_mallocz(sizeof(PESContext));
+ if (!pes)
+ return 0;
+ pes->ts = ts;
+ pes->stream = ts->stream;
+ pes->pid = pid;
+ pes->pcr_pid = pcr_pid;
+ pes->stream_type = stream_type;
+ tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
+ if (!tss) {
+ av_free(pes);
+ return 0;
+ }
+ return pes;
+}
+
+/* handle one TS packet */
+static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
+{
+ AVFormatContext *s = ts->stream;
+ MpegTSFilter *tss;
+ int len, pid, cc, cc_ok, afc, is_start;
+ const uint8_t *p, *p_end;
+
+ pid = AV_RB16(packet + 1) & 0x1fff;
+ if(pid && discard_pid(ts, pid))
+ return;
+ is_start = packet[1] & 0x40;
+ tss = ts->pids[pid];
+ if (ts->auto_guess && tss == NULL && is_start) {
+ add_pes_stream(ts, pid, -1, 0);
+ 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;
+
+ ts->pos47= url_ftell(ts->stream->pb) % ts->raw_packet_size;
+
+ if (tss->type == MPEGTS_SECTION) {
+ if (is_start) {
+ /* pointer field present */
+ len = *p++;
+ if (p + len > p_end)
+ return;
+ if (len && cc_ok) {
+ /* write remaining section bytes */
+ write_section_data(s, tss,
+ p, len, 0);
+ /* check whether filter has been closed */
+ if (!ts->pids[pid])
+ return;
+ }
+ 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,
+ p, p_end - p, is_start);
+ }
+}
+
+/* XXX: try to find a better synchro over several packets (use
+ get_packet_size() ?) */
+static int mpegts_resync(ByteIOContext *pb)
+{
+ int c, i;
+
+ for(i = 0;i < MAX_RESYNC_SIZE; i++) {
+ c = url_fgetc(pb);
+ if (c < 0)
+ return -1;
+ if (c == 0x47) {
+ url_fseek(pb, -1, SEEK_CUR);
+ return 0;
+ }
+ }
+ /* no sync found */
+ return -1;
+}
+
+/* return -1 if error or EOF. Return 0 if OK. */
+static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
+{
+ int skip, len;
+
for(;;) {
- len = get_buffer(pb, packet, ts->raw_packet_size);
- if (len != ts->raw_packet_size)
- return AVERROR_IO;
+ len = get_buffer(pb, buf, TS_PACKET_SIZE);
+ if (len != TS_PACKET_SIZE)
+ return AVERROR(EIO);
/* check paquet sync byte */
- /* 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)
+ if (buf[0] != 0x47) {
+ /* find a new packet start */
+ url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
+ if (mpegts_resync(pb) < 0)
+ return AVERROR_INVALIDDATA;
+ else
continue;
- ts->pids[pid] = tss;
- tss->pid = pid;
- tss->last_cc = -1;
- // printf("new pid=0x%x\n", pid);
+ } else {
+ skip = raw_packet_size - TS_PACKET_SIZE;
+ if (skip > 0)
+ url_fskip(pb, skip);
+ break;
}
+ }
+ 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;
-
- if (mpegts_push_data(s, tss, pkt, p, TS_PACKET_SIZE - (p - packet),
- packet[1] & 0x40))
+static int handle_packets(MpegTSContext *ts, int nb_packets)
+{
+ AVFormatContext *s = ts->stream;
+ ByteIOContext *pb = s->pb;
+ uint8_t packet[TS_PACKET_SIZE];
+ int packet_num, ret;
+
+ ts->stop_parse = 0;
+ packet_num = 0;
+ for(;;) {
+ if (ts->stop_parse>0)
break;
+ packet_num++;
+ if (nb_packets != 0 && packet_num >= nb_packets)
+ break;
+ ret = read_packet(pb, packet, ts->raw_packet_size);
+ if (ret != 0)
+ return ret;
+ handle_packet(ts, packet);
}
return 0;
}
+static int mpegts_probe(AVProbeData *p)
+{
+#if 1
+ const int size= p->buf_size;
+ int score, fec_score, dvhs_score;
+#define CHECK_COUNT 10
+
+ if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
+ return -1;
+
+ score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
+ dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
+ fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
+// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
+
+// we need a clear definition for the returned score otherwise things will become messy sooner or later
+ if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
+ else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
+ else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
+ else return -1;
+#else
+ /* only use the extension for safer guess */
+ if (match_ext(p->filename, "ts"))
+ return AVPROBE_SCORE_MAX;
+ else
+ return 0;
+#endif
+}
+
+/* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
+ (-1) if not available */
+static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
+ const uint8_t *packet)
+{
+ int afc, len, flags;
+ const uint8_t *p;
+ unsigned int v;
+
+ afc = (packet[3] >> 4) & 3;
+ if (afc <= 1)
+ return -1;
+ p = packet + 4;
+ len = p[0];
+ p++;
+ if (len == 0)
+ return -1;
+ flags = *p++;
+ len--;
+ if (!(flags & 0x10))
+ return -1;
+ if (len < 6)
+ return -1;
+ v = AV_RB32(p);
+ *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
+ *ppcr_low = ((p[4] & 1) << 8) | p[5];
+ return 0;
+}
+
+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;
+
+ if (ap) {
+ ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
+ if(ap->mpeg2ts_raw){
+ av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
+ return -1;
+ }
+ }
+
+ /* 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->stream = s;
+ ts->auto_guess = 0;
+
+ if (s->iformat == &mpegts_demuxer) {
+ /* normal demux */
+
+ /* first do a scaning to get all the services */
+ url_fseek(pb, pos, SEEK_SET);
+ mpegts_scan_sdt(ts);
+
+ mpegts_set_service(ts);
+
+ handle_packets(ts, s->probesize);
+ /* if could not find service, enable auto_guess */
+
+ ts->auto_guess = 1;
+
+#ifdef DEBUG_SI
+ av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
+#endif
+ s->ctx_flags |= AVFMTCTX_NOHEADER;
+ } else {
+ AVStream *st;
+ int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
+ int64_t pcrs[2], pcr_h;
+ int packet_count[2];
+ uint8_t packet[TS_PACKET_SIZE];
+
+ /* only read packets */
+
+ st = av_new_stream(s, 0);
+ if (!st)
+ goto fail;
+ av_set_pts_info(st, 60, 1, 27000000);
+ st->codec->codec_type = CODEC_TYPE_DATA;
+ st->codec->codec_id = CODEC_ID_MPEG2TS;
+
+ /* we iterate until we find two PCRs to estimate the bitrate */
+ pcr_pid = -1;
+ nb_pcrs = 0;
+ nb_packets = 0;
+ for(;;) {
+ ret = read_packet(s->pb, packet, ts->raw_packet_size);
+ if (ret < 0)
+ return -1;
+ pid = AV_RB16(packet + 1) & 0x1fff;
+ if ((pcr_pid == -1 || pcr_pid == pid) &&
+ parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
+ pcr_pid = pid;
+ packet_count[nb_pcrs] = nb_packets;
+ pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
+ nb_pcrs++;
+ if (nb_pcrs >= 2)
+ break;
+ }
+ nb_packets++;
+ }
+
+ /* NOTE1: the bitrate is computed without the FEC */
+ /* NOTE2: it is only the bitrate of the start of the stream */
+ ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
+ ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
+ s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
+ st->codec->bit_rate = s->bit_rate;
+ st->start_time = ts->cur_pcr;
+#if 0
+ av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
+ st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
+#endif
+ }
+
+ url_fseek(pb, pos, SEEK_SET);
+ return 0;
+ fail:
+ return -1;
+}
+
+#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
+
+static int mpegts_raw_read_packet(AVFormatContext *s,
+ AVPacket *pkt)
+{
+ MpegTSContext *ts = s->priv_data;
+ int ret, i;
+ int64_t pcr_h, next_pcr_h, pos;
+ int pcr_l, next_pcr_l;
+ uint8_t pcr_buf[12];
+
+ if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
+ return AVERROR(ENOMEM);
+ pkt->pos= url_ftell(s->pb);
+ ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
+ if (ret < 0) {
+ av_free_packet(pkt);
+ return ret;
+ }
+ if (ts->mpeg2ts_compute_pcr) {
+ /* compute exact PCR for each packet */
+ if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
+ /* we read the next PCR (XXX: optimize it by using a bigger buffer */
+ pos = url_ftell(s->pb);
+ for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
+ url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
+ get_buffer(s->pb, pcr_buf, 12);
+ if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
+ /* XXX: not precise enough */
+ ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
+ (i + 1);
+ break;
+ }
+ }
+ url_fseek(s->pb, pos, SEEK_SET);
+ /* no next PCR found: we use previous increment */
+ ts->cur_pcr = pcr_h * 300 + pcr_l;
+ }
+ pkt->pts = ts->cur_pcr;
+ pkt->duration = ts->pcr_incr;
+ ts->cur_pcr += ts->pcr_incr;
+ }
+ pkt->stream_index = 0;
+ return 0;
+}
+
+static int mpegts_read_packet(AVFormatContext *s,
+ AVPacket *pkt)
+{
+ MpegTSContext *ts = s->priv_data;
+
+ ts->pkt = pkt;
+ return handle_packets(ts, 0);
+}
+
static int mpegts_read_close(AVFormatContext *s)
{
MpegTSContext *ts = s->priv_data;
int i;
+
+ clear_programs(ts);
+
for(i=0;i<NB_PID_MAX;i++)
- av_free(ts->pids[i]);
+ if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
+
+ return 0;
+}
+
+static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
+ int64_t *ppos, int64_t pos_limit)
+{
+ MpegTSContext *ts = s->priv_data;
+ int64_t pos, timestamp;
+ uint8_t buf[TS_PACKET_SIZE];
+ int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
+ const int find_next= 1;
+ pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
+ if (find_next) {
+ for(;;) {
+ url_fseek(s->pb, pos, SEEK_SET);
+ if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
+ return AV_NOPTS_VALUE;
+ if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
+ parse_pcr(×tamp, &pcr_l, buf) == 0) {
+ break;
+ }
+ pos += ts->raw_packet_size;
+ }
+ } else {
+ for(;;) {
+ pos -= ts->raw_packet_size;
+ if (pos < 0)
+ return AV_NOPTS_VALUE;
+ url_fseek(s->pb, pos, SEEK_SET);
+ if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
+ return AV_NOPTS_VALUE;
+ if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
+ parse_pcr(×tamp, &pcr_l, buf) == 0) {
+ break;
+ }
+ }
+ }
+ *ppos = pos;
+
+ return timestamp;
+}
+
+static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
+ MpegTSContext *ts = s->priv_data;
+ uint8_t buf[TS_PACKET_SIZE];
+ int64_t pos;
+
+ if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
+ return -1;
+
+ pos= url_ftell(s->pb);
+
+ for(;;) {
+ url_fseek(s->pb, pos, SEEK_SET);
+ if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
+ return -1;
+// pid = AV_RB16(buf + 1) & 0x1fff;
+ if(buf[1] & 0x40) break;
+ pos += ts->raw_packet_size;
+ }
+ url_fseek(s->pb, pos, SEEK_SET);
+
return 0;
}
-AVInputFormat mpegts_demux = {
+/**************************************************************/
+/* parsing functions - called from other demuxers such as RTP */
+
+MpegTSContext *mpegts_parse_open(AVFormatContext *s)
+{
+ MpegTSContext *ts;
+
+ ts = av_mallocz(sizeof(MpegTSContext));
+ if (!ts)
+ return NULL;
+ /* no stream case, currently used by RTP */
+ ts->raw_packet_size = TS_PACKET_SIZE;
+ ts->stream = s;
+ ts->auto_guess = 1;
+ return ts;
+}
+
+/* return the consumed length if a packet was output, or -1 if no
+ packet is output */
+int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
+ const uint8_t *buf, int len)
+{
+ int len1;
+
+ len1 = len;
+ ts->pkt = pkt;
+ ts->stop_parse = 0;
+ for(;;) {
+ if (ts->stop_parse>0)
+ break;
+ if (len < TS_PACKET_SIZE)
+ return -1;
+ if (buf[0] != 0x47) {
+ buf++;
+ len--;
+ } else {
+ handle_packet(ts, buf);
+ buf += TS_PACKET_SIZE;
+ len -= TS_PACKET_SIZE;
+ }
+ }
+ return len1 - len;
+}
+
+void mpegts_parse_close(MpegTSContext *ts)
+{
+ int i;
+
+ for(i=0;i<NB_PID_MAX;i++)
+ av_free(ts->pids[i]);
+ av_free(ts);
+}
+
+AVInputFormat mpegts_demuxer = {
"mpegts",
- "MPEG2 transport stream format",
+ NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
sizeof(MpegTSContext),
mpegts_probe,
mpegts_read_header,
mpegts_read_packet,
mpegts_read_close,
- .flags = AVFMT_NOHEADER | AVFMT_SHOW_IDS,
+ read_seek,
+ mpegts_get_pcr,
+ .flags = AVFMT_SHOW_IDS,
};
-int mpegts_init(void)
-{
- av_register_input_format(&mpegts_demux);
- return 0;
-}
+AVInputFormat mpegtsraw_demuxer = {
+ "mpegtsraw",
+ NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
+ sizeof(MpegTSContext),
+ NULL,
+ mpegts_read_header,
+ mpegts_raw_read_packet,
+ mpegts_read_close,
+ read_seek,
+ mpegts_get_pcr,
+ .flags = AVFMT_SHOW_IDS,
+};
projects / ffmpeg / blobdiff