*
* 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
-
+#include "crc.h"
#include "mpegts.h"
//#define DEBUG_SI
+//#define DEBUG_SEEK
/* 1.0 second at 24Mbit/s */
-#define MAX_SCAN_PACKETS 16000
+#define MAX_SCAN_PACKETS 32000
+
+/* maximum size in which we look for synchronisation if
+ synchronisation is lost */
+#define MAX_RESYNC_SIZE 4096
+
+typedef struct PESContext PESContext;
-static int add_pes_stream(AVFormatContext *s, int pid);
+static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
+static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
enum MpegTSFilterType {
MPEGTS_PES,
MPEGTS_SECTION,
};
-/* XXX: suppress 'pkt' parameter */
typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);
typedef struct MpegTSPESFilter {
char *name;
} MpegTSService;
-typedef struct MpegTSContext {
+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;
+ int mpeg2ts_raw; /* force raw MPEG2 transport stream output, if possible */
+ int mpeg2ts_compute_pcr; /* compute exact PCR for each transport stream packet */
+
+ /* used to estimate the exact PCR */
+ int64_t cur_pcr;
+ int pcr_incr;
+ int pcr_pid;
+
/* data needed to handle file based ts */
int stop_parse; /* stop parsing loop */
AVPacket *pkt; /* packet containing av data */
MpegTSFilter *sdt_filter;
int nb_services;
MpegTSService **services;
-
+
/* set service context (XXX: allocated it ?) */
SetServiceCallback *set_service_cb;
void *set_service_opaque;
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;
}
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;
+ if (!tss->check_crc ||
+ av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0)
+ tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size);
}
}
-MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
+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
+ printf("Filter: pid=0x%x\n", pid);
+#endif
if (pid >= NB_PID_MAX || ts->pids[pid])
return NULL;
filter = av_mallocz(sizeof(MpegTSFilter));
- if (!filter)
+ if (!filter)
return NULL;
ts->pids[pid] = filter;
filter->type = MPEGTS_SECTION;
return filter;
}
-MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
+static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
PESCallback *pes_cb,
void *opaque)
{
if (pid >= NB_PID_MAX || ts->pids[pid])
return NULL;
filter = av_mallocz(sizeof(MpegTSFilter));
- if (!filter)
+ if (!filter)
return NULL;
ts->pids[pid] = filter;
filter->type = MPEGTS_PES;
return filter;
}
-void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *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);
+ else if (filter->type == MPEGTS_PES)
+ av_freep(&filter->u.pes_filter.opaque);
+
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; i++){
+ if(buf[i] == 0x47){
+ 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 i;
+ int score, fec_score, dvhs_score;
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;
+
+ 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 {
return str;
}
-static int parse_section_header(SectionHeader *h,
+static int parse_section_header(SectionHeader *h,
const uint8_t **pp, const uint8_t *p_end)
{
int val;
return 0;
}
-static MpegTSService *new_service(MpegTSContext *ts, int sid,
+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",
+ printf("new_service: sid=0x%04x provider='%s' name='%s'\n",
sid, provider_name, name);
#endif
{
MpegTSContext *ts = opaque;
SectionHeader h1, *h = &h1;
- const uint8_t *p, *p_end;
- int program_info_length, pcr_pid, pid, stream_type, desc_length;
-
+ PESContext *pes;
+ AVStream *st;
+ 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];
+
#ifdef DEBUG_SI
printf("PMT:\n");
- av_hex_dump((uint8_t *)section, section_len);
+ av_hex_dump(stdout, (uint8_t *)section, section_len);
#endif
p_end = section + section_len - 4;
p = section;
pcr_pid = get16(&p, p_end) & 0x1fff;
if (pcr_pid < 0)
return;
+ ts->pcr_pid = pcr_pid;
#ifdef DEBUG_SI
printf("pcr_pid=0x%x\n", pcr_pid);
#endif
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_length = get16(&p, p_end) & 0xfff;
- if (desc_length < 0)
+ desc_list_len = get16(&p, p_end) & 0xfff;
+ if (desc_list_len < 0)
break;
- p += desc_length;
- if (p > p_end)
- return;
+ 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
+ printf("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
printf("stream_type=%d pid=0x%x\n", stream_type, pid);
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_AUDIO_AAC:
case STREAM_TYPE_AUDIO_AC3:
- add_pes_stream(ts->stream, pid);
+ case STREAM_TYPE_AUDIO_DTS:
+ case STREAM_TYPE_SUBTITLE_DVB:
+ pes = add_pes_stream(ts, pid, stream_type);
+ if (pes)
+ st = new_pes_av_stream(pes, 0);
break;
default:
/* we ignore the other streams */
break;
}
+
+ if (st) {
+ if (language[0] != 0) {
+ st->language[0] = language[0];
+ st->language[1] = language[1];
+ st->language[2] = language[2];
+ st->language[3] = language[3];
+ }
+
+ if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
+ st->codec->sub_id = (anc_page << 16) | comp_page;
+ }
+ }
}
/* all parameters are there */
ts->set_service_cb(ts->set_service_opaque, 0);
#ifdef DEBUG_SI
printf("PAT:\n");
- av_hex_dump((uint8_t *)section, section_len);
+ av_hex_dump(stdout, (uint8_t *)section, section_len);
#endif
p_end = section + section_len - 4;
p = section;
if (sid == 0x0000) {
/* NIT info */
} else {
- if (ts->req_sid == sid || ts->req_sid < 0) {
- ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
+ if (ts->req_sid == sid) {
+ ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
pmt_cb, ts, 1);
goto found;
}
ts->pat_filter = NULL;
}
-void mpegts_set_service(MpegTSContext *ts, int sid,
+/* 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(stdout, (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;
+}
+
+static 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,
+ ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
pat_cb, ts, 1);
}
#ifdef DEBUG_SI
printf("SDT:\n");
- av_hex_dump((uint8_t *)section, section_len);
+ av_hex_dump(stdout, (uint8_t *)section, section_len);
#endif
p_end = section + section_len - 4;
ts->sdt_filter = NULL;
}
-/* scan services an a transport stream by looking at the sdt */
-void mpegts_scan_sdt(MpegTSContext *ts)
+/* scan services in a transport stream by looking at the SDT */
+static void mpegts_scan_sdt(MpegTSContext *ts)
{
- ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID,
+ 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 !) */
+static void mpegts_scan_pat(MpegTSContext *ts)
+{
+ ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
+ pat_scan_cb, ts, 1);
+}
/* TS stream handling */
#define PES_START_SIZE 9
#define MAX_PES_HEADER_SIZE (9 + 255)
-typedef struct PESContext {
+struct PESContext {
int pid;
+ int stream_type;
+ MpegTSContext *ts;
AVFormatContext *stream;
AVStream *st;
enum MpegTSState state;
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)
{
const uint8_t *buf, int buf_size, int is_start)
{
PESContext *pes = opaque;
- MpegTSContext *ts = pes->stream->priv_data;
- AVStream *st;
+ MpegTSContext *ts = pes->ts;
const uint8_t *p;
- int len, code, codec_type, codec_id;
-
+ int len, code;
+
if (is_start) {
pes->state = MPEGTS_HEADER;
pes->data_index = 0;
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;
- }
+ new_pes_av_stream(pes, code);
}
pes->state = MPEGTS_PESHEADER_FILL;
pes->total_size = (pes->header[4] << 8) | pes->header[5];
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;
}
}
-static int add_pes_stream(AVFormatContext *s, int pid)
+static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
+{
+ 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_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:
+ 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_MPEG1VIDEO;
+ }
+ 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 = 1;
+ pes->st = st;
+ }
+ return st;
+}
+
+
+static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
{
- 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;
+ return 0;
+ pes->ts = ts;
+ pes->stream = ts->stream;
pes->pid = pid;
+ pes->stream_type = stream_type;
tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
if (!tss) {
av_free(pes);
- return -1;
+ return 0;
}
- return 0;
+ return pes;
}
/* handle one TS packet */
-static void handle_packet(AVFormatContext *s, uint8_t *packet)
+static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
{
- MpegTSContext *ts = s->priv_data;
+ AVFormatContext *s = ts->stream;
MpegTSFilter *tss;
int len, pid, cc, cc_ok, afc, is_start;
const uint8_t *p, *p_end;
is_start = packet[1] & 0x40;
tss = ts->pids[pid];
if (ts->auto_guess && tss == NULL && is_start) {
- add_pes_stream(s, pid);
+ add_pes_stream(ts, pid, 0);
tss = ts->pids[pid];
}
if (!tss)
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;
p_end = packet + TS_PACKET_SIZE;
if (p >= p_end)
return;
-
+
if (tss->type == MPEGTS_SECTION) {
if (is_start) {
/* pointer field present */
if (p + len > p_end)
return;
if (len && cc_ok) {
- /* write remaning section bytes */
- write_section_data(s, tss,
+ /* 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,
+ write_section_data(s, tss,
p, p_end - p, 1);
}
} else {
if (cc_ok) {
- write_section_data(s, tss,
+ write_section_data(s, tss,
p, p_end - p, 0);
- }
+ }
}
} else {
- tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,
+ tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,
p, p_end - p, is_start);
}
}
-static int handle_packets(AVFormatContext *s, int nb_packets)
+/* XXX: try to find a better synchro over several packets (use
+ get_packet_size() ?) */
+static int mpegts_resync(ByteIOContext *pb)
{
- MpegTSContext *ts = s->priv_data;
+ 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, buf, TS_PACKET_SIZE);
+ if (len != TS_PACKET_SIZE)
+ return AVERROR_IO;
+ /* check paquet sync byte */
+ 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;
+ } else {
+ skip = raw_packet_size - TS_PACKET_SIZE;
+ if (skip > 0)
+ url_fskip(pb, skip);
+ break;
+ }
+ }
+ return 0;
+}
+
+static int handle_packets(MpegTSContext *ts, int nb_packets)
+{
+ AVFormatContext *s = ts->stream;
ByteIOContext *pb = &s->pb;
- uint8_t packet[TS_FEC_PACKET_SIZE];
- int packet_num, len;
- int i, found = 0;
- int64_t pos;
+ uint8_t packet[TS_PACKET_SIZE];
+ int packet_num, ret;
ts->stop_parse = 0;
packet_num = 0;
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)
- {
- //printf("bad packet: 0x%x\n", packet[0]);
- found = 0;
- for (i = 0; i < ts->raw_packet_size; i++)
- {
- if (packet[i] == 0x47)
- {
- found = 1;
- //printf("packet start at: %d\n", i);
- break;
- }
- }
-
- if (found)
- {
- url_fseek(pb, pos + i, SEEK_SET);
- continue;
- }
- return AVERROR_INVALIDDATA;
- }
- handle_packet(s, packet);
+ 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)
{
- int size;
- size = get_packet_size(p->buf, p->buf_size);
- if (size < 0)
+#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;
- return AVPROBE_SCORE_MAX - 1;
+#endif
}
void set_service_cb(void *opaque, int ret)
ts->stop_parse = 1;
}
+/* 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 = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
+ *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;
+ int len, sid, i;
int64_t pos;
MpegTSService *service;
-
+
+ if (ap) {
+ ts->mpeg2ts_raw = ap->mpeg2ts_raw;
+ ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
+ }
+
/* read the first 1024 bytes to get packet size */
pos = url_ftell(pb);
len = get_buffer(pb, buf, sizeof(buf));
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 (!ts->auto_guess) {
- int sid = -1;
- 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)
- {
+
+goto_auto_guess:
+ if (!ts->mpeg2ts_raw) {
+ /* normal demux */
+
+ 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(ts, MAX_SCAN_PACKETS);
+
+ if (ts->nb_services <= 0) {
+ /* no SDT found, we try to look at the PAT */
+
+ /* First remove the SDT filters from each PID */
+ int i;
+ for (i=0; i < NB_PID_MAX; i++) {
+ if (ts->pids[i])
+ mpegts_close_filter(ts, ts->pids[i]);
+ }
+ url_fseek(pb, pos, SEEK_SET);
+ mpegts_scan_pat(ts);
+
+ handle_packets(ts, MAX_SCAN_PACKETS);
+ }
+
+ if (ts->nb_services <= 0) {
+ /* raw transport stream */
+ ts->auto_guess = 1;
+ s->ctx_flags |= AVFMTCTX_NOHEADER;
+ goto do_pcr;
+ }
+
/* tune to first service found */
- service = ts->services[0];
- sid = service->sid;
+ for(i=0; i<ts->nb_services && ts->set_service_ret; i++){
+ service = ts->services[i];
+ sid = service->sid;
#ifdef DEBUG_SI
- printf("tuning to '%s'\n", service->name);
+ 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 */
+ /* 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);
+ url_fseek(pb, pos, SEEK_SET);
+ 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;
+ handle_packets(ts, MAX_SCAN_PACKETS);
+ }
+ /* if could not find service, exit */
+
+ if (ts->set_service_ret != 0) {
+ if(ts->auto_guess)
+ return -1;
+ else {
+ //let's retry with auto_guess set
+ ts->auto_guess = 1;
+ goto goto_auto_guess;
+ }
+ }
#ifdef DEBUG_SI
- printf("tuning done\n");
+ printf("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 */
+
+ do_pcr:
+ 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 = ((packet[1] & 0x1f) << 8) | packet[2];
+ 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++;
+ }
+ ts->pcr_pid = pcr_pid;
+
+ /* 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
+ printf("start=%0.3f pcr=%0.3f incr=%d\n",
+ st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
#endif
}
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 -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(s, 0);
+
+ if (!ts->mpeg2ts_raw) {
+ ts->pkt = pkt;
+ return handle_packets(ts, 0);
+ } else {
+ return mpegts_raw_read_packet(s, pkt);
+ }
}
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]);
+ if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
+
+ for(i = 0; i < ts->nb_services; i++){
+ av_free(ts->services[i]->provider_name);
+ av_free(ts->services[i]->name);
+ av_free(ts->services[i]);
+ }
+ av_freep(&ts->services);
+
+ 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, pid;
+ const int find_next= 1;
+ pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
+ 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;
+ pid = ((buf[1] & 0x1f) << 8) | buf[2];
+ if (pid == ts->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;
+ pid = ((buf[1] & 0x1f) << 8) | buf[2];
+ if (pid == ts->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 = ((buf[1] & 0x1f) << 8) | buf[2];
+ 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)
+ 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",
sizeof(MpegTSContext),
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);
- av_register_output_format(&mpegts_mux);
- return 0;
-}
projects / ffmpeg / blobdiff