--- /dev/null
+/*
+ * MPEG2 transport stream (aka DVB) demux
+ * 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
+ * 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"
+
+//#define DEBUG_SI
+
+/* 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
+
+static int add_pes_stream(AVFormatContext *s, int pid);
+
+enum MpegTSFilterType {
+ MPEGTS_PES,
+ MPEGTS_SECTION,
+};
+
+typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);
+
+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;
+ int last_cc; /* last cc code (-1 if first packet) */
+ 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 */
+ 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 uint8_t *buf, int size)
+{
+ 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;
+ }
+ return TS_PACKET_SIZE;
+ try_fec:
+ for(i=0;i<5;i++) {
+ if (buf[i * TS_FEC_PACKET_SIZE] != 0x47)
+ return -1;
+ }
+ return TS_FEC_PACKET_SIZE;
+}
+
+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 = (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)
+{
+ int len;
+ const uint8_t *p;
+ char *str;
+
+ 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;
+}
+
+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 || (ts->req_sid >= 0 && 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_MPEG1:
+ case STREAM_TYPE_AUDIO_MPEG2:
+ case STREAM_TYPE_VIDEO_MPEG1:
+ case STREAM_TYPE_VIDEO_MPEG2:
+ case STREAM_TYPE_AUDIO_AC3:
+ 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;
+}
+
+/* add all services found in the PAT */
+static void pat_scan_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;
+ char *provider_name, *name;
+ char buf[256];
+
+#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 {
+ /* add the service with a dummy name */
+ snprintf(buf, sizeof(buf), "Service %x\n", sid);
+ name = av_strdup(buf);
+ provider_name = av_strdup("");
+ if (name && provider_name) {
+ new_service(ts, sid, provider_name, name);
+ } else {
+ av_freep(&name);
+ av_freep(&provider_name);
+ }
+ }
+ }
+ ts->stop_parse = 1;
+
+ /* remove filter */
+ 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 in 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);
+}
+
+/* scan services in a transport stream by looking at the PAT (better
+ than nothing !) */
+void mpegts_scan_pat(MpegTSContext *ts)
+{
+ ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
+ pat_scan_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 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 uint8_t *p;
+ int len, code, codec_type, codec_id;
+
+ if (is_start) {
+ pes->state = MPEGTS_HEADER;
+ pes->data_index = 0;
+ }
+ p = buf;
+ while (buf_size > 0) {
+ switch(pes->state) {
+ case MPEGTS_HEADER:
+ 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 (pes->data_index == PES_START_SIZE) {
+ /* we got all the PES or section header. We can now
+ decide */
+#if 0
+ av_hex_dump(pes->header, pes->data_index);
+#endif
+ if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
+ pes->header[2] == 0x01) {
+ /* it must be an mpeg2 PES stream */
+ code = pes->header[3] | 0x100;
+ if (!((code >= 0x1c0 && code <= 0x1df) ||
+ (code >= 0x1e0 && code <= 0x1ef) ||
+ (code == 0x1bd)))
+ goto skip;
+ if (!pes->st) {
+ /* allocate stream */
+ 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_MPEG1VIDEO;
+ }
+ st = av_new_stream(pes->stream, pes->pid);
+ if (st) {
+ st->priv_data = pes;
+ st->codec.codec_type = codec_type;
+ st->codec.codec_id = codec_id;
+ pes->st = st;
+ }
+ }
+ 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:
+ pes->state = MPEGTS_SKIP;
+ continue;
+ }
+ }
+ break;
+ /**********************************************/
+ /* PES packing parsing */
+ case MPEGTS_PESHEADER_FILL:
+ 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;
+ 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 (pes->total_size) {
+ len = pes->total_size - pes->data_index;
+ if (len > buf_size)
+ len = buf_size;
+ } else {
+ len = buf_size;
+ }
+ if (len > 0) {
+ 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;
+ }
+ }
+ buf_size = 0;
+ break;
+ case MPEGTS_SKIP:
+ buf_size = 0;
+ 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;
+}
+
+/* handle one TS packet */
+static void handle_packet(AVFormatContext *s, uint8_t *packet)
+{
+ MpegTSContext *ts = s->priv_data;
+ 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);
+ }
+}
+
+/* XXX: try to find a better synchro over several packets (use
+ get_packet_size() ?) */
+static int mpegts_resync(AVFormatContext *s)
+{
+ ByteIOContext *pb = &s->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;
+}
+
+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;
+ int64_t pos;
+
+ ts->stop_parse = 0;
+ packet_num = 0;
+ for(;;) {
+ if (ts->stop_parse)
+ break;
+ packet_num++;
+ if (nb_packets != 0 && packet_num >= nb_packets)
+ break;
+ pos = url_ftell(pb);
+ len = get_buffer(pb, packet, ts->raw_packet_size);
+ if (len != ts->raw_packet_size)
+ return AVERROR_IO;
+ /* check paquet sync byte */
+ if (packet[0] != 0x47) {
+ /* find a new packet start */
+ url_fseek(pb, -ts->raw_packet_size, SEEK_CUR);
+ if (mpegts_resync(s) < 0)
+ return AVERROR_INVALIDDATA;
+ else
+ continue;
+ }
+ handle_packet(s, packet);
+ }
+ return 0;
+}
+
+static int mpegts_probe(AVProbeData *p)
+{
+#if 1
+ int size;
+ size = get_packet_size(p->buf, p->buf_size);
+ if (size < 0)
+ return 0;
+ return AVPROBE_SCORE_MAX - 1;
+#else
+ /* only use the extension for safer guess */
+ if (match_ext(p->filename, "ts"))
+ return AVPROBE_SCORE_MAX;
+ else
+ return 0;
+#endif
+}
+
+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, sid;
+ int64_t pos;
+ MpegTSService *service;
+
+ /* 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) {
+ ts->set_service_ret = -1;
+
+ /* 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 (ts->nb_services <= 0) {
+ /* no SDT found, we try to look at the PAT */
+
+ url_fseek(pb, pos, SEEK_SET);
+ mpegts_scan_pat(ts);
+
+ handle_packets(s, MAX_SCAN_PACKETS);
+ }
+
+ if (ts->nb_services <= 0)
+ return -1;
+
+ /* tune to first service found */
+ service = ts->services[0];
+ sid = service->sid;
+#ifdef DEBUG_SI
+ printf("tuning to '%s'\n", service->name);
+#endif
+
+ /* now find the info for the first service if we found any,
+ otherwise try to filter all PATs */
+
+ url_fseek(pb, pos, SEEK_SET);
+ ts->stream = s;
+ mpegts_set_service(ts, 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)
+{
+ MpegTSContext *ts = s->priv_data;
+ int i;
+ for(i=0;i<NB_PID_MAX;i++)
+ av_free(ts->pids[i]);
+ return 0;
+}
+
+AVInputFormat mpegts_demux = {
+ "mpegts",
+ "MPEG2 transport stream format",
+ sizeof(MpegTSContext),
+ mpegts_probe,
+ mpegts_read_header,
+ mpegts_read_packet,
+ mpegts_read_close,
+ .flags = AVFMT_NOHEADER | AVFMT_SHOW_IDS,
+};
+
+int mpegts_init(void)
+{
+ av_register_input_format(&mpegts_demux);
+ av_register_output_format(&mpegts_mux);
+ return 0;
+}
projects / synfig.git / blobdiff