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reader.c
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reader.c
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#include "common.h"
#include <libsi/si.h>
#define _fourcc(p) (uint32_t) v4l2_fourcc(*(p), *(p+1), *(p+2), *(p+3))
#define TS_HEADER(_PID, _PES_HDR, _COUNTER, _ADAPTATION_CTRL) ts_buffer[0] = TS_SYNC_BYTE; \
ts_buffer[1] = (_PES_HDR ? 0x40:0) | (_PID >> 8); \
ts_buffer[2] = _PID & 0xFF; \
ts_buffer[3] = _ADAPTATION_CTRL << 4 | (_COUNTER & 0xf)
#define TS_PAYLOAD 0x1
#define TS_ADAPTATION_FIELD 0x2
#define SENDPATPMT_PACKETINTERVAL 500
static const short kVideoPid = 301;
static const short kAudioPid = 300;
static const short kTeletextPid = 305;
static const short kPCRPid = 101;
static const uint32_t itv0 = v4l2_fourcc('i','t','v','0');
static const uint32_t ITV0 = v4l2_fourcc('I','T','V','0');
const unsigned char kPAT[TS_SIZE] = {
0x47, 0x40, 0x00, 0x10, 0x00, 0x00, 0xb0, 0x0d,
0x00, 0x00, 0xc1, 0x00, 0x00, 0x00, 0x01, 0xe0,
0x84, 0xcc, 0x32, 0xcc, 0x32, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff
};
const unsigned char kPMTwithTeletext[TS_SIZE] = {
0x47, 0x40, 0x84, 0x10, 0x00, 0x02, 0xb0, 0x24,
0x00, 0x01, 0xc1, 0x00, 0x00, 0xe0, 0x65, 0xf0,
0x00, 0x02, 0xe1, 0x2d, 0xf0, 0x00, 0x04, 0xe1,
0x2c, 0xf0, 0x06, 0x0a, 0x04, 0x00, 0x00, 0x00,
0x01, 0x06, 0xe1, 0x31, 0xf0, 0x02, 0x56, 0x00,
0xcc, 0x32, 0xcc, 0x32, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff
};
const unsigned char kPMTwithoutTeletext[TS_SIZE] = {
0x47, 0x40, 0x84, 0x10, 0x00, 0x02, 0xb0, 0x1d,
0x00, 0x01, 0xc1, 0x00, 0x00, 0xe0, 0x65, 0xf0,
0x00, 0x02, 0xe1, 0x2d, 0xf0, 0x00, 0x04, 0xe1,
0x2c, 0xf0, 0x06, 0x0a, 0x04, 0x00, 0x00, 0x00,
0x01, 0xcc, 0x32, 0xcc, 0x32, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff
};
const unsigned char kPMTRadio[TS_SIZE] = {
0x47, 0x40, 0x84, 0x10, 0x00, 0x02, 0xb0, 0x18,
0x00, 0x01, 0xc1, 0x00, 0x00, 0xe0, 0x65, 0xf0,
0x00, 0x04, 0xe1, 0x2c, 0xf0, 0x06, 0x0a, 0x04,
0x00, 0x00, 0x00, 0x01, 0xcc, 0x32, 0xcc, 0x32,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff
};
const unsigned char kInvTab[256] = {
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
};
/* helper class for protected crc32-function in libsi */
class cPvrCRC32 : public SI::CRC32 {
public:
static inline u_int32_t crc32(const char *d, int len, u_int32_t CRCvalue) {
return SI::CRC32::crc32(d, len, CRCvalue);
}
};
cPvrReadThread::cPvrReadThread(cRingBufferLinear *TsBuffer, cPvrDevice *_parent)
: tsBuffer(TsBuffer),
video_counter(0),
audio_counter(0),
text_counter(0),
pcr_counter(0),
packet_counter(0),
pes_stream_id(0),
pes_offset(0),
pes_length(0),
pes_tmp(0),
pes_scr_isvalid(false),
pes_scr(0),
pes_scr_ext(0)
{
log(pvrDEBUG1, "cPvrReadThread");
parent = _parent;
parent->readThreadRunning = true;
SetDescription("PvrReadThread of /dev/video%d", _parent->number);
Start();
}
cPvrReadThread::~cPvrReadThread(void)
{
log(pvrDEBUG2, "~cPvrReadThread");
parent->readThreadRunning = false;
if (Running())
Cancel(3);
}
int cPvrReadThread::PutData(const unsigned char *Data, int Count)
{
if (!tsBuffer) {
log(pvrINFO,"cPvrReadThread::PutData():Unable to put data into RingBuffer");
return 0;
}
int bytesFree = tsBuffer->Free();
if (bytesFree < Count) {
log(pvrERROR,"cPvrReadThread::PutData():Unable to put data into RingBuffer, only %d bytes free, need %d", bytesFree, Count);
return 0;
}
int written = tsBuffer->Put(Data, Count);
if (written != Count) {
log(pvrERROR,"cPvrReadThread::PutData():put incomplete data into RingBuffer, only %d bytes written, wanted %d", written, Count);
tsBuffer->ReportOverflow(Count - written);
}
return written;
}
void cPvrReadThread::PesToTs(uint8_t *Data, uint32_t Length)
{
uint8_t stream_id;
bool write_PES_hdr = true;
uint32_t i;
const short *pid = &kVideoPid;
uint8_t *counter = &video_counter;
const short PayloadSize = TS_SIZE - 4;
uint32_t Payload_Count = Length / PayloadSize;
uint32_t Payload_Rest = Length % PayloadSize;
stream_id = Data[3];
if (packet_counter <= 0) { // time to send PAT and PMT
// increase continuity counter
pat_buffer[ 3] = (pat_buffer[ 3] & 0xF0) | (((pat_buffer[ 3] & 0x0F) + 1) & 0x0F);
pmt_buffer[ 3] = (pmt_buffer[ 3] & 0xF0) | (((pmt_buffer[ 3] & 0x0F) + 1) & 0x0F);
PutData(pat_buffer, TS_SIZE);
PutData(pmt_buffer, TS_SIZE);
packet_counter = SENDPATPMT_PACKETINTERVAL;
}
if (pes_scr_isvalid && (stream_id != 0xBD)) { // send PCR packet but not PCR of vbi data
TS_HEADER(kPCRPid, 0, pcr_counter, TS_ADAPTATION_FIELD);
ts_buffer[4] = 0xB7;
ts_buffer[5] = 0x10;
ts_buffer[6] = (pes_scr & 0x01FE000000ull) >> 25; // 33 bits SCR base
ts_buffer[7] = (pes_scr & 0x01FE0000) >> 17;
ts_buffer[8] = (pes_scr & 0x01FE00) >> 9;
ts_buffer[9] = (pes_scr & 0x01FE) >> 1;
ts_buffer[10] = (pes_scr & 0x01) << 7;
ts_buffer[10] |= 0x7E; // 6 bits between SCR and SCR extension
ts_buffer[10] |= (pes_scr_ext & 0x0100) >> 8; // 9 bits SCR extension
ts_buffer[11] = (pes_scr_ext & 0xFF);
memset(ts_buffer + 12, 0xFF, TS_SIZE - 12);
PutData(ts_buffer, TS_SIZE);
pcr_counter = (pcr_counter + 1) & 15;
pes_scr_isvalid = false;
}
switch (stream_id) {
case 0xC0 ... 0xDF: // ISO/IEC 13818-3 or ISO/IEC 11172-3 audio.
pid = &kAudioPid;
counter = &audio_counter;
// fall through to video stream
case 0xE0 ... 0xEF: // ITU-T Rec. H.262 | ISO/IEC 13818-2 or ISO/IEC 11172-2 video
if (parent->CurrentInputType == eRadio && stream_id >= 0xE0)
return; // skip video in case of "FM radio only"
for (i = 0; i < Payload_Count; i++) {
TS_HEADER(*pid, write_PES_hdr, *counter, TS_PAYLOAD);
memcpy(ts_buffer + 4, Data + i * PayloadSize, PayloadSize);
PutData(ts_buffer, TS_SIZE);
packet_counter--;
*counter = (*counter + 1) & 15; //uint8_t
write_PES_hdr = false;
} // end: for (i = 0; i < Payload_Count; i++)
if (Payload_Rest > 0) {
TS_HEADER(*pid, write_PES_hdr, *counter, (TS_PAYLOAD | TS_ADAPTATION_FIELD));
ts_buffer[4] = PayloadSize - Payload_Rest - 1;
if (ts_buffer[4] > 0) {
ts_buffer[5] = 0x00;
memset(ts_buffer + 6, 0xFF, ts_buffer[4] - 1);
} //end: if (ts_buffer[4] > 0)
memcpy(ts_buffer + 5 + ts_buffer[4], Data + i * PayloadSize, Payload_Rest);
PutData(ts_buffer, TS_SIZE);
packet_counter--;
*counter = (*counter + 1) & 15;
write_PES_hdr = false;
} // end: if (Payload_Rest > 0)
break; // end: case 0xE0..0xEF:
case 0xBD: { // private_stream_1 (teletext, vps, wss and closed_caption)
uint16_t pes_bytes = 46; // (9+36)byte PES header + 1byte data_identifier
uint16_t pes_mod; // number of pes bytes in last TS packet
uint8_t ts_bytes = 0; // number of bytes of current TS packet
v4l2_mpeg_vbi_fmt_ivtv *vbi_fmt = (v4l2_mpeg_vbi_fmt_ivtv*)(Data + 9 + Data[8]);
v4l2_mpeg_vbi_itv0_line *vbi_line = 0;
uint32_t magic = _fourcc(vbi_fmt->magic);
uint32_t bitmask = 0; // itv0 bitmask
uint32_t *linemask = NULL; // pointer to current itv0 32bit linemask.
uint8_t field_parity = 0;
uint8_t line_offset = 0;
uint8_t *dp = NULL;
uint8_t itv0_index = 0; // index 0 corresponds to the first valid bit in linemask
if ((magic != itv0) && (magic != ITV0)) {
log(pvrERROR,"%s %d: skipping garbage teletext data.", __FUNCTION__, __LINE__);
return;
}
// count number of valid vbi lines to calculate length of pes packet
itv0_index = 0;
bitmask = 1;
linemask = &vbi_fmt->itv0.linemask[0];
for (int line = 0; line < 36; line++) {
if (magic == itv0) {
if (line > 34) // only up to 35 lines in itv0.
break;
if (line == 32) {
linemask++; // linemask[0] -> linemask[1]
bitmask = 1; // reinit bitmask
}
if (*linemask & bitmask) // this line found in dynamic itv0 array?
vbi_line = &vbi_fmt->itv0.line[itv0_index++];
else
vbi_line = NULL;
bitmask <<= 1;
}
else // magic == ITV0; static 36 line array of sliced vbi
vbi_line = &vbi_fmt->ITV0.line[line];
if (!vbi_line) continue; // itv0 and not in linemask
switch (vbi_line->id) {
case V4L2_MPEG_VBI_IVTV_TELETEXT_B:
case V4L2_MPEG_VBI_IVTV_WSS_625:
case V4L2_MPEG_VBI_IVTV_VPS:
// case V4L2_MPEG_VBI_IVTV_CAPTION_525:
pes_bytes += 46; // aligned to (TS_SIZE - 4)/4
break;
default:;
}
} // end for loop
if (pes_bytes < 47)
return; // no payload found.
// we need to fill up n-times 184bytes. if something is left over,
// fill up the last packet with stuffing bytes 0xFF
pes_mod = pes_bytes % 184;
if (pes_mod > 0)
pes_bytes += 184 - pes_mod;
// begin of teletext PES packet. set payload start and increase counter after new TS hdr
TS_HEADER(kTeletextPid, 1, text_counter++, TS_PAYLOAD);
memcpy(&ts_buffer[4], Data, 9 + Data[8]);
ts_buffer[8] = (pes_bytes - 6) >> 8; // PES hdr byte 5. pes_bytes - 6 byte ('00 00 01 BD xx xx')
ts_buffer[9] = (pes_bytes - 6) & 0xFF; // PES hdr byte 6. pes_bytes - 6 byte ('00 00 01 BD xx xx')
ts_buffer[12] = 0x24; // PES hdr byte 9. PES hdr len, 0x24 -> 36 bytes PES hdr following
ts_buffer[49] = 0x10; // beginn payload after PES hdr, data identifier for EBU data 0x10
ts_bytes = 50; // 4byte hdr + 1/4 of 184 bytes payload per TS packet.
memset(&ts_buffer[ts_bytes], 0xFF, TS_SIZE - ts_bytes);
// prepare for copy loop
itv0_index = 0;
bitmask = 1;
linemask = &vbi_fmt->itv0.linemask[0];
for (int line = 0; line < 36; line++) {
if (magic == itv0) {
if (line > 34) // up to 35 lines in itv0.
break;
if (line == 32) {
linemask++; // linemask[0] -> linemask[1]
bitmask = 1; // reinit bitmask
}
if (*linemask & bitmask) // this line found in dynamic itv0 array?
vbi_line = &vbi_fmt->itv0.line[itv0_index++];
else
vbi_line = NULL;
bitmask <<= 1;
}
else // magic == ITV0; static 36 line array of sliced vbi
vbi_line = &vbi_fmt->ITV0.line[line];
if (!vbi_line) continue; // itv0 and not in linemask
// itv0 is a variable length array that holds from 1 to 35 lines of sliced VBI data. The sliced VBI
// data lines present correspond to the bits set in the linemask array, starting from b0 of linemask[0]
// up through b31 of linemask[0], and from b0 of linemask[1] up through b 3 of linemask[1].
// line[0] corresponds to the first bit found set in the linemask array, line[1] corresponds to the
// second bit found set in the linemask array, etc. If no linemask array bits are set, then line[0]
// may contain one line of unspecified data that should be ignored by applications.
// NOTE: variable 'line' corresponds, if valid, to the same line_offset as in case of ITV0.
//
// v4l2 api: ITV0 line[0] through line [17] correspond to lines 6 through 23 of the first field.
// line[18] through line[35] corresponds to lines 6 through 23 of the second field.
// en301775: field_parity: "The value '1' indicates the first field of a frame; the value '0' indicates
// the second field of a frame."
// en301775 Table 5: line_offset for EBU and Inverted Teletext
if (line < 18) {
field_parity = 1;
line_offset = line + 6;
}
else {
field_parity = 0;
line_offset = line - 12;
}
dp = &ts_buffer[ts_bytes];
switch (vbi_line->id) {
case V4L2_MPEG_VBI_IVTV_TELETEXT_B: {
*(dp++) = 0x02; // data_unit_id
*(dp++) = 0x2C; // data_unit_length (0x2C -> 44bytes still following)
*(dp++) = 0xC0 | (field_parity << 5) | (line_offset & 0x1f);
*(dp++) = 0xE4; // framing_code 11100100 for EBU teletext, en300706
for (int i = 0; i < 42; i++) // 42 byte payload per line (inverse bit order); starting after Clock run-in
*(dp++) = kInvTab[vbi_line->data[i]];
ts_bytes += 46;
break;
}
case V4L2_MPEG_VBI_IVTV_WSS_625: {
*(dp++) = 0xC4; // data_unit_id
*(dp++) = 0x2C; // data_unit_length: 1byte 0xF7 + 14bit data + 0b11 reserved + 40bytes filling.
*(dp++) = 0xF7; // 0b11 + 1bit parity = 1 + 5bit fixed line 23
for (int i = 0; i < 2; i++)
*(dp++) = kInvTab[vbi_line->data[i]]; // 14bit data
ts_bytes += 46;
break;
}
case V4L2_MPEG_VBI_IVTV_VPS: {
*(dp++) = 0xC3; // data_unit_id
*(dp++) = 0x2C; // data_unit_length: 1byte 0xF0 + 13byte data (after Start Code) + 29bytes filling.
*(dp++) = 0xF0; // 0b11 + 1bit parity = 1 + 5bit fixed line 16
for (int i = 0; i < 13; i++)
*(dp++) = kInvTab[vbi_line->data[i]]; // 13bytes in inverse bit order. en300231
ts_bytes += 46;
break;
}
//case V4L2_MPEG_VBI_IVTV_CAPTION_525: {
// *(dp++) = 0xC5; // data_unit_id
// *(dp++) = 0x2C; // data_unit_length: aligned to 46bytes
// // what structure here?
// ts_bytes += 46;
// break;
// }
default:;
}
if (ts_bytes >= TS_SIZE) {
PutData(ts_buffer, TS_SIZE); // next (4 + 4*46) byte for TS packet reached. send packet
TS_HEADER(kTeletextPid, 0, text_counter++, TS_PAYLOAD);
ts_bytes = 4; // 4bytes TS hdr size
memset(&ts_buffer[ts_bytes], 0xFF, TS_SIZE - ts_bytes);
}
} // end copy for loop
if (ts_bytes > 4) {
// need bit stuffing last TS packet.
// ts_buffer is set to 0xFF, so just set the data_unit_length for stuffing
for (;ts_bytes < TS_SIZE; ts_bytes += 46)
ts_buffer[1 + ts_bytes] = 0x2C;
PutData(ts_buffer, TS_SIZE);
}
break; // end: case 0xBD:
}
case 0xBE: // padding_stream
return;
default: // unexpected stream_id.
log(pvrDEBUG1,"%s: unhandled stream_id 0x%.2x", __FUNCTION__, stream_id);
} // end: switch (stream_id)
}
void cPvrReadThread::ParseProgramStream(uint8_t *Data, uint32_t Length)
{
uint32_t pos = 0;
while (pos < Length) {
switch(pes_offset) {
case 0:
case 1:
if (Data[pos] == 0x00)
pes_offset++;
else
pes_offset = 0;
pos++;
break;
case 2:
if (Data[pos] == 0x01) {
pes_offset++;
pos++;
}
else
pes_offset = 0;
break;
case 3:
pes_stream_id = Data[pos];
pes_offset++;
pos++;
break;
default:
switch (pes_stream_id) {
case 0xBA:
switch (pes_offset) {
case 4:
pes_scr = (uint64_t)(Data[pos] & 0x38) << 27;
pes_scr |= (uint64_t)(Data[pos] & 3) << 28;
pes_offset++;
pos++;
break;
case 5:
pes_scr |= (uint64_t)(Data[pos]) << 20;
pes_offset++;
pos++;
break;
case 6:
pes_scr |= (uint64_t)(Data[pos] & 0xf8) << 12;
pes_scr |= (uint64_t)(Data[pos] & 3) << 13;
pes_offset++;
pos++;
break;
case 7:
pes_scr |= (uint64_t)(Data[pos]) << 5;
pes_offset++;
pos++;
break;
case 8:
pes_scr |= (uint64_t)(Data[pos] & 0xf8) >> 3;
pes_scr_ext = (uint64_t)(Data[pos] & 3) << 7;
pes_offset++;
pos++;
break;
case 9:
pes_scr_ext |= (Data[pos] & 0xfe) >> 1;
pes_scr_isvalid = true;
pes_offset++;
pos++;
break;
case 10 ... 12:
pes_offset++;
pos++;
break;
case 13:
pes_tmp = Data[pos] & 7;
pes_offset++;
pos++;
break;
default:
if (pes_tmp > 0) {
pes_tmp--;
pos++;
}
else
pes_offset = 0;
break;
}
break;
case 0xBB:
switch (pes_offset) {
case 4 ... 11:
pes_offset++;
pos++;
break;
default:
if (pes_tmp > 0) {
pes_tmp--;
pos++;
}
else
if (Data[pos] & 0x80) {
pes_tmp = 3;
}
else {
pes_offset = 0;
}
break;
} // end: switch (pes_offset)
break; // end: case 0xBB
case 0xBD ... 0xEF:
switch (pes_offset) {
case 4:
pes_length = Data[pos] << 8;
pes_offset++;
pos++;
break;
case 5:
pes_length += Data[pos];
pes_buffer[0] = 0x00;
pes_buffer[1] = 0x00;
pes_buffer[2] = 0x01;
pes_buffer[3] = pes_stream_id;
pes_buffer[4] = pes_length >> 8;
pes_buffer[5] = pes_length & 0xFF;
pes_length += 6;
pes_offset++;
pos++;
break;
default: {
uint32_t rest = pes_length - pes_offset;
if (pos + rest <= Length) {
memcpy(pes_buffer + pes_offset, Data + pos, rest);
pos += rest;
PesToTs(pes_buffer, pes_length);
pes_offset = 0;
}
else {
memcpy(pes_buffer + pes_offset, Data + pos, Length - pos);
pes_offset += Length - pos;
pos += Length - pos;
}
}
break;
}
break;
default:
// unexpected PES Stream id, most probably garbage data.
pes_offset = 0;
return;
break;
} // end: switch (pes_stream_id)
} // end: switch(pes_offset)
} // end: while (pos < Length)
}
void cPvrReadThread::Action(void)
{
int bufferSize = PvrSetup.ReadBufferSizeKB * 1024;
uint8_t *buffer = new uint8_t[bufferSize];
int r;
int retries = 3;
int reopen_retries = 5;
struct timeval selTimeout;
fd_set selSet;
log(pvrDEBUG1,"cPvrReadThread::Action(): Entering Action()");
// A derived cThread class must check Running()
// repeatedly to see whether it's time to stop.
// see VDR/thread.h
packet_counter = 0;
// prepare PAT and PMT
if (parent->streamType != V4L2_MPEG_STREAM_TYPE_MPEG2_TS) {
memcpy(pat_buffer, kPAT, TS_SIZE);
int sid = parent->CurrentChannel.Sid();
int tid = parent->CurrentChannel.Tid();
pat_buffer[8] = (tid >> 8) & 0xFF;
pat_buffer[9] = tid & 0xFF;
pat_buffer[13] = (sid >> 8) & 0xFF;
pat_buffer[14] = sid & 0xFF;
int crc = cPvrCRC32::crc32((const char*)(pat_buffer + 5), 12, 0xFFFFFFFF);
pat_buffer[17] = crc >> 24;
pat_buffer[18] = crc >> 16;
pat_buffer[19] = crc >> 8;
pat_buffer[20] = crc;
int crc_offset = 0;
if (parent->CurrentInputType == eRadio) {
memcpy(pmt_buffer, kPMTRadio, TS_SIZE);
crc_offset = 28;
}
else if ((PvrSetup.SliceVBI != 0) && (cPvrDevice::VBIDeviceCount > 0)) {
memcpy(pmt_buffer, kPMTwithTeletext, TS_SIZE);
crc_offset = 40;
}
else {
memcpy(pmt_buffer, kPMTwithoutTeletext, TS_SIZE);
crc_offset = 33;
}
pmt_buffer[8] = (sid >> 8) & 0xFF;
pmt_buffer[9] = sid & 0xFF;
crc = cPvrCRC32::crc32((const char*)(pmt_buffer + 5), crc_offset - 5, 0xFFFFFFFF);
pmt_buffer[crc_offset] = crc >> 24;
pmt_buffer[crc_offset + 1] = crc >> 16;
pmt_buffer[crc_offset + 2] = crc >> 8;
pmt_buffer[crc_offset + 3] = crc;
}
retry:
while (Running() && parent->readThreadRunning) {
selTimeout.tv_sec = 0;
selTimeout.tv_usec = 200000;
FD_ZERO(&selSet);
FD_SET(parent->v4l2_fd, &selSet);
r = select(parent->v4l2_fd + 1, &selSet, 0, 0, &selTimeout);
if ((r == 0) && (errno == 0)) {
log(pvrDEBUG1, "cPvrReadThread::Action():timeout on select from /dev/video%d: %d:%s %s",
parent->number, errno, strerror(errno), (retries > 0) ? " - retrying" : "");
}
else if ((r < 0) || (errno != 0)) {
log(pvrERROR, "cPvrReadThread::Action():error on select from /dev/video%d: %d:%s %s",
parent->number, errno, strerror(errno), (retries > 0) ? " - retrying" : "");
retries--;
if (retries > 0) {
usleep(100);
goto retry;
}
while (reopen_retries > 0) {
reopen_retries--;
if (parent->ReOpen() > 0) {
retries = 3;
goto retry;
}
}
break;
}
else if (FD_ISSET(parent->v4l2_fd, &selSet)) {
r = read(parent->v4l2_fd, buffer, bufferSize);
if (r < 0) {
log(pvrERROR, "cPvrReadThread::Action():error reading from /dev/video%d: %d:%s %s",
parent->number, errno, strerror(errno), (retries > 0) ? " - retrying" : "");
retries--;
if (retries > 0) {
usleep(100);
goto retry;
}
break;
}
if (r > 0) {
if (parent->streamType == V4L2_MPEG_STREAM_TYPE_MPEG2_TS)
PutData(buffer, r);
else
ParseProgramStream(buffer, r);
}
}
}
delete [] buffer;
log(errno ? pvrERROR : pvrDEBUG2, "cPvrReadThread::Action() %s on /dev/video%d ",
errno ? "failed" : "stopped", parent->number);
}