/* * libzvbi -- Raw VBI decoder * * Copyright (C) 2000-2004 Michael H. Schimek * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301 USA. */ /* $Id: raw_decoder.c,v 1.24 2008-08-19 10:04:46 mschimek Exp $ */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "misc.h" #include "raw_decoder.h" #ifndef RAW_DECODER_PATTERN_DUMP # define RAW_DECODER_PATTERN_DUMP 0 #endif # define sp_sample_format sampling_format /** * $addtogroup RawDecoder Raw VBI decoder * $ingroup Raw * $brief Converting a raw VBI image to sliced VBI data. */ /* Missing: VITC PAL 6-22 11.2us 1.8125 Mbit NRZ two start bits + CRC VITC NTSC 10-21 ditto CGMS NTSC 20 11us .450450 Mbit NRZ ? MOJI */ const _vbi_service_par _vbi_service_table[] = { { VBI_SLICED_TELETEXT_A, /* UNTESTED */ "Teletext System A", VBI_VIDEOSTD_SET_625_50, {6, 318}, {22, 335}, 10500, 6203125, 6203125, /* 397 x FH */ 0x00AAAAE7, 0xFFFF, 18, 6, 37 * 8, VBI_MODULATION_NRZ_LSB, 0, /* probably */ }, { VBI_SLICED_TELETEXT_B_L10_625, "Teletext System B 625 Level 1.5", VBI_VIDEOSTD_SET_625_50, {7, 320}, {22, 335}, 10300, 6937500, 6937500, /* 444 x FH */ 0x00AAAAE4, 0xFFFF, 18, 6, 42 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { VBI_SLICED_TELETEXT_B, "Teletext System B, 625", VBI_VIDEOSTD_SET_625_50, {6, 318}, {22, 335}, 10300, 6937500, 6937500, /* 444 x FH */ 0x00AAAAE4, 0xFFFF, 18, 6, 42 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { VBI_SLICED_TELETEXT_C_625, /* UNTESTED */ "Teletext System C 625", VBI_VIDEOSTD_SET_625_50, {6, 318}, {22, 335}, 10480, 5734375, 5734375, /* 367 x FH */ 0x00AAAAE7, 0xFFFF, 18, 6, 33 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { VBI_SLICED_TELETEXT_D_625, /* UNTESTED */ "Teletext System D 625", VBI_VIDEOSTD_SET_625_50, {6, 318}, {22, 335}, 10500, /* or 10970 depending on field order */ 5642787, 5642787, /* 14/11 x FSC (color subcarrier) */ 0x00AAAAE5, 0xFFFF, 18, 6, 34 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { VBI_SLICED_VPS, "Video Program System", VBI_VIDEOSTD_SET_PAL_BG, {16, 0}, {16, 0}, 12500, 5000000, 2500000, /* 160 x FH */ 0xAAAA8A99, 0xFFFFFF, 32, 0, 13 * 8, VBI_MODULATION_BIPHASE_MSB, _VBI_SP_FIELD_NUM, }, { VBI_SLICED_VPS_F2, "Pseudo-VPS on field 2", VBI_VIDEOSTD_SET_PAL_BG, {0, 329}, {0, 329}, 12500, 5000000, 2500000, /* 160 x FH */ 0xAAAA8A99, 0xFFFFFF, 32, 0, 13 * 8, VBI_MODULATION_BIPHASE_MSB, _VBI_SP_FIELD_NUM, }, { VBI_SLICED_WSS_625, "Wide Screen Signalling 625", VBI_VIDEOSTD_SET_625_50, {23, 0}, {23, 0}, 11000, 5000000, 833333, /* 160/3 x FH */ /* ...1000 111 / 0 0011 1100 0111 1000 0011 111x */ /* ...0010 010 / 0 1001 1001 0011 0011 1001 110x */ 0x8E3C783E, 0x2499339C, 32, 0, 14 * 1, VBI_MODULATION_BIPHASE_LSB, /* Hm. Too easily confused with caption?? */ _VBI_SP_FIELD_NUM | _VBI_SP_LINE_NUM, }, { VBI_SLICED_CAPTION_625_F1, "Closed Caption 625, field 1", VBI_VIDEOSTD_SET_625_50, {22, 0}, {22, 0}, 10500, 1000000, 500000, /* 32 x FH */ 0x00005551, 0x7FF, 14, 2, 2 * 8, VBI_MODULATION_NRZ_LSB, _VBI_SP_FIELD_NUM, }, { VBI_SLICED_CAPTION_625_F2, "Closed Caption 625, field 2", VBI_VIDEOSTD_SET_625_50, {0, 335}, {0, 335}, 10500, 1000000, 500000, /* 32 x FH */ 0x00005551, 0x7FF, 14, 2, 2 * 8, VBI_MODULATION_NRZ_LSB, _VBI_SP_FIELD_NUM, }, { VBI_SLICED_VBI_625, "VBI 625", /* Blank VBI */ VBI_VIDEOSTD_SET_625_50, {6, 318}, {22, 335}, 10000, 1510000, 1510000, 0, 0, 0, 0, 10 * 8, 0, /* 10.0-2 ... 62.9+1 us */ 0, }, { VBI_SLICED_TELETEXT_B_525, /* UNTESTED */ "Teletext System B 525", VBI_VIDEOSTD_SET_525_60, {10, 272}, {21, 284}, 10500, 5727272, 5727272, /* 364 x FH */ 0x00AAAAE4, 0xFFFF, 18, 6, 34 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { VBI_SLICED_TELETEXT_C_525, /* UNTESTED */ "Teletext System C 525", VBI_VIDEOSTD_SET_525_60, {10, 272}, {21, 284}, 10480, 5727272, 5727272, /* 364 x FH */ 0x00AAAAE7, 0xFFFF, 18, 6, 33 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { VBI_SLICED_TELETEXT_D_525, /* UNTESTED */ "Teletext System D 525", VBI_VIDEOSTD_SET_525_60, {10, 272}, {21, 284}, 9780, 5727272, 5727272, /* 364 x FH */ 0x00AAAAE5, 0xFFFF, 18, 6, 34 * 8, VBI_MODULATION_NRZ_LSB, 0, }, { #if 0 /* FIXME probably wrong */ VBI_SLICED_WSS_CPR1204, /* NOT CONFIRMED (EIA-J CPR-1204) */ "Wide Screen Signalling 525", VBI_VIDEOSTD_SET_NTSC_M_JP, {20, 283}, {20, 283}, 11200, 1789773, 447443, /* 1/8 x FSC */ 0x000000F0, 0xFF, 8, 0, 20 * 1, VBI_MODULATION_NRZ_MSB, /* No useful FRC, but a six bit CRC */ 0, }, { #endif VBI_SLICED_CAPTION_525_F1, "Closed Caption 525, field 1", VBI_VIDEOSTD_SET_525_60, {21, 0}, {21, 0}, 10500, 1006976, 503488, /* 32 x FH */ #if 0 /* Test of CRI bits has been removed to handle the incorrect signal observed by Rich Kandel (see _VBI_RAW_SHIFT_CC_CRI). */ 0x03, 0x0F, 4, 0, 2 * 8, VBI_MODULATION_NRZ_LSB, #else 0x00005551, 0x7FF, 14, 2, 2 * 8, VBI_MODULATION_NRZ_LSB, /* I've seen CC signals on other lines and there's no way to distinguish from the transmitted data. */ #endif _VBI_SP_FIELD_NUM | _VBI_SP_LINE_NUM, }, { VBI_SLICED_CAPTION_525_F2, "Closed Caption 525, field 2", VBI_VIDEOSTD_SET_525_60, {0, 284}, {0, 284}, 10500, 1006976, 503488, /* 32 x FH */ #if 0 /* Test of CRI bits has been removed to handle the incorrect signal observed by Rich Kandel (see _VBI_RAW_SHIFT_CC_CRI). */ 0x03, 0x0F, 4, 0, 2 * 8, VBI_MODULATION_NRZ_LSB, #else 0x00005551, 0x7FF, 14, 2, 2 * 8, VBI_MODULATION_NRZ_LSB, #endif _VBI_SP_FIELD_NUM | _VBI_SP_LINE_NUM, }, { VBI_SLICED_2xCAPTION_525, /* NOT CONFIRMED */ "2xCaption 525", VBI_VIDEOSTD_SET_525_60, {10, 0}, {21, 0}, 10500, 1006976, 1006976, /* 64 x FH */ 0x000554ED, 0xFFFF, 12, 8, 4 * 8, VBI_MODULATION_NRZ_LSB, /* Tb. */ _VBI_SP_FIELD_NUM, }, { VBI_SLICED_VBI_525, "VBI 525", /* Blank VBI */ VBI_VIDEOSTD_SET_525_60, {10, 272}, {21, 284}, 9500, 1510000, 1510000, 0, 0, 0, 0, 10 * 8, 0, /* 9.5-1 ... 62.4+1 us */ 0, }, { 0, NULL, VBI_VIDEOSTD_SET_EMPTY, {0, 0}, {0, 0}, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, } }; _vbi_inline const _vbi_service_par * find_service_par (unsigned int service) { unsigned int i; for (i = 0; _vbi_service_table[i].id; ++i) if (service == _vbi_service_table[i].id) return _vbi_service_table + i; return NULL; } /** * $ingroup Sliced * $param service A data service identifier, for example from a * vbi_sliced structure. * * $return * Name of the $a service, in ASCII, or $c NULL if unknown. */ const char * vbi_sliced_name (vbi_service_set service) { const _vbi_service_par *par; /* These are ambiguous */ if (service == VBI_SLICED_CAPTION_525) return "Closed Caption 525"; if (service == VBI_SLICED_CAPTION_625) return "Closed Caption 625"; if (service == (VBI_SLICED_VPS | VBI_SLICED_VPS_F2)) return "Video Program System"; if (service == VBI_SLICED_TELETEXT_B_L25_625) return "Teletext System B 625 Level 2.5"; /* Incorrect, no longer in table */ if (service == VBI_SLICED_TELETEXT_BD_525) return "Teletext System B/D"; if ((par = find_service_par (service))) return par->label; return NULL; } /** * @ingroup Sliced * @param service A data service identifier, for example from a * vbi_sliced structure. * * @return * Number of payload bits, @c 0 if the service is unknown. */ unsigned int vbi_sliced_payload_bits (unsigned int service) { const _vbi_service_par *par; /* These are ambiguous */ if (service == VBI_SLICED_CAPTION_525) return 16; if (service == VBI_SLICED_CAPTION_625) return 16; if (service == (VBI_SLICED_VPS | VBI_SLICED_VPS_F2)) return 13 * 8; if (service == VBI_SLICED_TELETEXT_B_L25_625) return 42 * 8; /* Incorrect, no longer in table */ if (service == VBI_SLICED_TELETEXT_BD_525) return 34 * 8; if ((par = find_service_par (service))) return par->payload; return 0; } static void dump_pattern_line (const vbi3_raw_decoder * rd, unsigned int row, FILE * fp) { const vbi_sampling_par *sp; unsigned int line; unsigned int i; sp = &rd->sampling; if (sp->interlaced) { unsigned int field = row & 1; if (0 == sp->start[field]) line = 0; else line = sp->start[field] + (row >> 1); } else { if (row >= (unsigned int) sp->count[0]) { if (0 == sp->start[1]) line = 0; else line = sp->start[1] + row - sp->count[0]; } else { if (0 == sp->start[0]) line = 0; else line = sp->start[0] + row; } } fprintf (fp, "scan line %3u: ", line); for (i = 0; i < _VBI3_RAW_DECODER_MAX_WAYS; ++i) { unsigned int pos; pos = row * _VBI3_RAW_DECODER_MAX_WAYS; fprintf (fp, "%02x ", (uint8_t) rd->pattern[pos + i]); } fputc ('\n', fp); } void _vbi3_raw_decoder_dump (const vbi3_raw_decoder * rd, FILE * fp) { const vbi_sampling_par *sp; unsigned int i; assert (NULL != fp); fprintf (fp, "vbi3_raw_decoder %p\n", rd); if (NULL == rd) return; fprintf (fp, " services 0x%08x\n", rd->services); for (i = 0; i < rd->n_jobs; ++i) fprintf (fp, " job %u: 0x%08x (%s)\n", i + 1, rd->jobs[i].id, vbi_sliced_name (rd->jobs[i].id)); if (!rd->pattern) { fprintf (fp, " no pattern\n"); return; } sp = &rd->sampling; for (i = 0; i < ((unsigned int) sp->count[0] + (unsigned int) sp->count[1]); ++i) { fputs (" ", fp); dump_pattern_line (rd, i, fp); } } _vbi_inline int cpr1204_crc (const vbi_sliced * sliced) { const int poly = (1 << 6) + (1 << 1) + 1; int crc, i; crc = (+(sliced->data[0] << 12) + (sliced->data[1] << 4) + (sliced->data[2])); crc |= (((1 << 6) - 1) << (14 + 6)); for (i = 14 + 6 - 1; i >= 0; i--) { if (crc & ((1 << 6) << i)) crc ^= poly << i; } return crc; } static vbi_bool slice (vbi3_raw_decoder * rd, vbi_sliced * sliced, _vbi3_raw_decoder_job * job, unsigned int i, const uint8_t * raw) { if (rd->debug && NULL != rd->sp_lines) { return vbi3_bit_slicer_slice_with_points (&job->slicer, sliced->data, sizeof (sliced->data), rd->sp_lines[i].points, &rd->sp_lines[i].n_points, N_ELEMENTS (rd->sp_lines[i].points), raw); } else { return vbi3_bit_slicer_slice (&job->slicer, sliced->data, sizeof (sliced->data), raw); } } _vbi_inline vbi_sliced * decode_pattern (vbi3_raw_decoder * rd, vbi_sliced * sliced, int8_t * pattern, unsigned int i, const uint8_t * raw) { vbi_sampling_par *sp; int8_t *pat; sp = &rd->sampling; for (pat = pattern;; ++pat) { int j; j = *pat; /* data service n, blank 0, or counter -n */ if (j > 0) { _vbi3_raw_decoder_job *job; job = rd->jobs + j - 1; if (!slice (rd, sliced, job, i, raw)) { continue; /* no match, try next data service */ } /* FIXME probably wrong */ if (0 && VBI_SLICED_WSS_CPR1204 == job->id) { const int poly = (1 << 6) + (1 << 1) + 1; int crc, j; crc = (sliced->data[0] << 12) + (sliced->data[1] << 4) + sliced->data[2]; crc |= (((1 << 6) - 1) << (14 + 6)); for (j = 14 + 6 - 1; j >= 0; j--) { if (crc & ((1 << 6) << j)) crc ^= poly << j; } if (crc) continue; /* no match */ } /* Positive match, output decoded line. */ /* FIXME: if we have a field number we should really only set the service id of one field. */ sliced->id = job->id; sliced->line = 0; if (i >= (unsigned int) sp->count[0]) { if (sp->synchronous && 0 != sp->start[1]) sliced->line = sp->start[1] + i - sp->count[0]; } else { if (sp->synchronous && 0 != sp->start[0]) sliced->line = sp->start[0] + i; } if (0) fprintf (stderr, "%2d %s\n", sliced->line, vbi_sliced_name (sliced->id)); ++sliced; /* Predict line as non-blank, force testing for all data services in the next 128 frames. */ pattern[_VBI3_RAW_DECODER_MAX_WAYS - 1] = -128; } else if (pat == pattern) { /* Line was predicted as blank, once in 16 frames look for data services. */ if (0 == rd->readjust) { unsigned int size; size = sizeof (*pattern) * (_VBI3_RAW_DECODER_MAX_WAYS - 1); j = pattern[0]; memmove (&pattern[0], &pattern[1], size); pattern[_VBI3_RAW_DECODER_MAX_WAYS - 1] = j; } break; } else if ((j = pattern[_VBI3_RAW_DECODER_MAX_WAYS - 1]) < 0) { /* Increment counter, when zero predict line as blank and stop looking for data services until 0 == rd->readjust. */ /* Disabled because we may miss caption/subtitles when the signal inserter is disabled during silent periods for more than 4-5 seconds. */ /* pattern[_VBI3_RAW_DECODER_MAX_WAYS - 1] = j + 1; */ break; } else { /* found nothing, j = 0 */ } /* Try the found data service first next time. */ *pat = pattern[0]; pattern[0] = j; break; /* line done */ } return sliced; } /** * $param rd Pointer to vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(). * $param sliced Buffer to store the decoded vbi_sliced data. Since every * vbi scan line may contain data, this should be an array of vbi_sliced * with the same number of elements as scan lines in the raw image * (vbi_sampling_parameters.count[0] + .count[1]). * $param max_lines Size of $a sliced data array, in lines, not bytes. * $param raw A raw vbi image as described by the vbi_sampling_par * associated with $a rd. * * Decodes a raw vbi image, consisting of several scan lines of raw vbi data, * to sliced vbi data. The output is sorted by ascending line number. * * Note this function attempts to learn which lines carry which data * service, or if any, to speed up decoding. You should avoid using the same * vbi3_raw_decoder object for different sources. * * $return * The number of lines decoded, i. e. the number of vbi_sliced records * written. */ unsigned int vbi3_raw_decoder_decode (vbi3_raw_decoder * rd, vbi_sliced * sliced, unsigned int max_lines, const uint8_t * raw) { vbi_sampling_par *sp; unsigned int scan_lines; unsigned int pitch; int8_t *pattern; const uint8_t *raw1; vbi_sliced *sliced_begin; vbi_sliced *sliced_end; unsigned int i; if (!rd->services) return 0; sp = &rd->sampling; scan_lines = sp->count[0] + sp->count[1]; pitch = sp->bytes_per_line << sp->interlaced; pattern = rd->pattern; raw1 = raw; sliced_begin = sliced; sliced_end = sliced + max_lines; if (RAW_DECODER_PATTERN_DUMP) _vbi3_raw_decoder_dump (rd, stderr); for (i = 0; i < scan_lines; ++i) { if (sliced >= sliced_end) break; if (sp->interlaced && i == (unsigned int) sp->count[0]) raw = raw1 + sp->bytes_per_line; sliced = decode_pattern (rd, sliced, pattern, i, raw); pattern += _VBI3_RAW_DECODER_MAX_WAYS; raw += pitch; } rd->readjust = (rd->readjust + 1) & 15; return sliced - sliced_begin; } /** * $param rd Pointer to vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(). * * Resets a vbi3_raw_decoder object, removing all services added * with vbi3_raw_decoder_add_services(). */ void vbi3_raw_decoder_reset (vbi3_raw_decoder * rd) { assert (NULL != rd); if (rd->pattern) { vbi_free (rd->pattern); rd->pattern = NULL; } rd->services = 0; rd->n_jobs = 0; rd->readjust = 1; CLEAR (rd->jobs); } static void remove_job_from_pattern (vbi3_raw_decoder * rd, int job_num) { int8_t *pattern; unsigned int scan_lines; job_num += 1; /* index into rd->jobs, 0 means no job */ pattern = rd->pattern; scan_lines = rd->sampling.count[0] + rd->sampling.count[1]; /* For each scan line. */ while (scan_lines-- > 0) { int8_t *dst; int8_t *src; int8_t *end; dst = pattern; end = pattern + _VBI3_RAW_DECODER_MAX_WAYS; /* Remove jobs with job_num, fill up pattern with 0. Jobs above job_num move down in rd->jobs. */ for (src = dst; src < end; ++src) { int8_t num = *src; if (num > job_num) *dst++ = num - 1; else if (num != job_num) *dst++ = num; } while (dst < end) *dst++ = 0; pattern = end; } } /** * $param rd Pointer to vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(). * $param services Set of data services. * * Removes one or more data services to be decoded from the * vbi3_raw_decoder object. * * $return * Set describing the remaining data services $a rd will decode. */ vbi_service_set vbi3_raw_decoder_remove_services (vbi3_raw_decoder * rd, vbi_service_set services) { _vbi3_raw_decoder_job *job; unsigned int job_num; assert (NULL != rd); job = rd->jobs; job_num = 0; while (job_num < rd->n_jobs) { if (job->id & services) { if (rd->pattern) remove_job_from_pattern (rd, job_num); memmove (job, job + 1, (rd->n_jobs - job_num - 1) * sizeof (*job)); --rd->n_jobs; CLEAR (rd->jobs[rd->n_jobs]); } else { ++job_num; } } rd->services &= ~services; return rd->services; } static vbi_bool add_job_to_pattern (vbi3_raw_decoder * rd, int job_num, unsigned int *start, unsigned int *count) { int8_t *pattern_end; unsigned int scan_lines; unsigned int field; job_num += 1; /* index into rd->jobs, 0 means no job */ scan_lines = rd->sampling.count[0] + rd->sampling.count[1]; pattern_end = rd->pattern + scan_lines * _VBI3_RAW_DECODER_MAX_WAYS; for (field = 0; field < 2; ++field) { int8_t *pattern; unsigned int i; pattern = rd->pattern + start[field] * _VBI3_RAW_DECODER_MAX_WAYS; /* For each line where we may find the data. */ for (i = 0; i < count[field]; ++i) { unsigned int free; int8_t *dst; int8_t *src; int8_t *end; assert (pattern < pattern_end); dst = pattern; end = pattern + _VBI3_RAW_DECODER_MAX_WAYS; free = 0; for (src = dst; src < end; ++src) { int8_t num = *src; if (num <= 0) { ++free; continue; } else { free += (num == job_num); *dst++ = num; } } while (dst < end) *dst++ = 0; if (free <= 1) /* reserve a NULL way */ return FALSE; pattern = end; } } for (field = 0; field < 2; ++field) { int8_t *pattern; unsigned int i; pattern = rd->pattern + start[field] * _VBI3_RAW_DECODER_MAX_WAYS; /* For each line where we may find the data. */ for (i = 0; i < count[field]; ++i) { unsigned int way; for (way = 0; pattern[way] > 0; ++way) if (pattern[way] == job_num) break; pattern[way] = job_num; pattern[_VBI3_RAW_DECODER_MAX_WAYS - 1] = -128; pattern += _VBI3_RAW_DECODER_MAX_WAYS; } } return TRUE; } static void lines_containing_data (unsigned int start[2], unsigned int count[2], const vbi_sampling_par * sp, const _vbi_service_par * par) { unsigned int field; start[0] = 0; start[1] = sp->count[0]; count[0] = sp->count[0]; count[1] = sp->count[1]; if (!sp->synchronous) { /* XXX Scanning all lines isn't always necessary. */ return; } for (field = 0; field < 2; ++field) { unsigned int first; unsigned int last; if (0 == par->first[field] || 0 == par->last[field]) { /* No data on this field. */ count[field] = 0; continue; } first = sp->start[field]; last = first + sp->count[field] - 1; if (first > 0 && sp->count[field] > 0) { assert (par->first[field] <= par->last[field]); if ((unsigned int) par->first[field] > last || (unsigned int) par->last[field] < first) continue; first = MAX (first, (unsigned int) par->first[field]); last = MIN ((unsigned int) par->last[field], last); start[field] += first - sp->start[field]; count[field] = last + 1 - first; } } } /** * $param rd Pointer to vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(). * $param services Set of data services. * $param strict A value of 0, 1 or 2 requests loose, reliable or strict * matching of sampling parameters. For example if the data service * requires knowledge of line numbers, $c 0 will always accept the * service (which may work if the scan lines are populated in a * non-confusing way) but $c 1 or $c 2 will not. If the data service * might use more lines than are sampled, $c 1 will accept but $c 2 * will not. If unsure, set to $c 1. * * Adds one or more data services to be decoded. Currently the libzvbi * raw vbi decoder can decode up to eight data services in parallel. * * $return * Set describing the data services $a rd will decode. The function * eliminates services which cannot be decoded with the current * sampling parameters, or when they exceed the decoder capacity. */ /* Attn: strict must be int for compatibility with libzvbi 0.2 (-1 == 0) */ vbi_service_set vbi3_raw_decoder_add_services (vbi3_raw_decoder * rd, vbi_service_set services, int strict) { const _vbi_service_par *par; double min_offset; assert (NULL != rd); services &= ~(VBI_SLICED_VBI_525 | VBI_SLICED_VBI_625); if (rd->services & services) { info (&rd->log, "Already decoding services 0x%08x.", rd->services & services); services &= ~rd->services; } if (0 == services) { info (&rd->log, "No services to add."); return rd->services; } if (!rd->pattern) { unsigned int scan_lines; unsigned int scan_ways; unsigned int size; scan_lines = rd->sampling.count[0] + rd->sampling.count[1]; scan_ways = scan_lines * _VBI3_RAW_DECODER_MAX_WAYS; size = scan_ways * sizeof (rd->pattern[0]); rd->pattern = (int8_t *) vbi_malloc (size); if (NULL == rd->pattern) { error (&rd->log, "Out of memory."); return rd->services; } memset (rd->pattern, 0, scan_ways * sizeof (rd->pattern[0])); } if (525 == rd->sampling.scanning) { min_offset = 7.9e-6; } else { min_offset = 8.0e-6; } for (par = _vbi_service_table; par->id; ++par) { vbi_sampling_par *sp; _vbi3_raw_decoder_job *job; unsigned int start[2]; unsigned int count[2]; unsigned int sample_offset; unsigned int samples_per_line; unsigned int cri_end; unsigned int j; if (0 == (par->id & services)) continue; job = rd->jobs; /* Some jobs can be merged, otherwise we add a new job. */ for (j = 0; j < rd->n_jobs; ++j) { unsigned int id = job->id | par->id; /* Level 1.0 and 2.5 */ if (0 == (id & ~VBI_SLICED_TELETEXT_B) /* Field 1 and 2 */ || 0 == (id & ~VBI_SLICED_CAPTION_525) || 0 == (id & ~VBI_SLICED_CAPTION_625) || 0 == (id & ~(VBI_SLICED_VPS | VBI_SLICED_VPS_F2))) break; ++job; } if (j >= _VBI3_RAW_DECODER_MAX_JOBS) { error (&rd->log, "Set 0x%08x exceeds number of " "simultaneously decodable " "services (%u).", services, _VBI3_RAW_DECODER_MAX_WAYS); break; } else if (j >= rd->n_jobs) { job->id = 0; } sp = &rd->sampling; if (!_vbi_sampling_par_check_services_log (sp, par->id, strict, &rd->log)) continue; sample_offset = 0; /* Skip color burst. */ /* Offsets aren't that reliable, sigh. */ if (0 && sp->offset > 0 && strict > 0) { double offset; offset = sp->offset / (double) sp->sampling_rate; if (offset < min_offset) sample_offset = (int) (min_offset * sp->sampling_rate); } if (VBI_SLICED_WSS_625 & par->id) { /* TODO: WSS 625 occupies only first half of line, we can abort earlier. */ cri_end = ~0; } else { cri_end = ~0; } samples_per_line = sp->bytes_per_line / VBI_PIXFMT_BPP (sp->sp_sample_format); if (!_vbi3_bit_slicer_init (&job->slicer)) { assert (!"bit_slicer_init"); } if (!vbi3_bit_slicer_set_params (&job->slicer, sp->sp_sample_format, sp->sampling_rate, sample_offset, samples_per_line, par->cri_frc >> par->frc_bits, par->cri_frc_mask >> par->frc_bits, par->cri_bits, par->cri_rate, cri_end, (par->cri_frc & ((1U << par->frc_bits) - 1)), par->frc_bits, par->payload, par->bit_rate, par->modulation)) { assert (!"bit_slicer_set_params"); } vbi3_bit_slicer_set_log_fn (&job->slicer, rd->log.mask, rd->log.fn, rd->log.user_data); lines_containing_data (start, count, sp, par); if (!add_job_to_pattern (rd, job - rd->jobs, start, count)) { error (&rd->log, "Out of decoder pattern space for " "service 0x%08x (%s).", par->id, par->label); continue; } job->id |= par->id; if (job >= rd->jobs + rd->n_jobs) ++rd->n_jobs; rd->services |= par->id; } return rd->services; } vbi_bool vbi3_raw_decoder_sampling_point (vbi3_raw_decoder * rd, vbi3_bit_slicer_point * point, unsigned int row, unsigned int nth_bit) { assert (NULL != rd); assert (NULL != point); if (row >= rd->n_sp_lines) return FALSE; if (nth_bit >= rd->sp_lines[row].n_points) return FALSE; *point = rd->sp_lines[row].points[nth_bit]; return TRUE; } vbi_bool vbi3_raw_decoder_debug (vbi3_raw_decoder * rd, vbi_bool enable) { #if 0 /* Set but unused */ _vbi3_raw_decoder_sp_line *sp_lines; #endif unsigned int n_lines; vbi_bool r; assert (NULL != rd); #if 0 /* Set but unused */ sp_lines = NULL; #endif r = TRUE; rd->debug = ! !enable; n_lines = 0; if (enable) { n_lines = rd->sampling.count[0] + rd->sampling.count[1]; } switch (rd->sampling.sp_sample_format) { case VBI_PIXFMT_YUV420: break; default: /* Not implemented. */ n_lines = 0; r = FALSE; break; } if (rd->n_sp_lines == n_lines) return r; vbi_free (rd->sp_lines); rd->sp_lines = NULL; rd->n_sp_lines = 0; if (n_lines > 0) { rd->sp_lines = calloc (n_lines, sizeof (*rd->sp_lines)); if (NULL == rd->sp_lines) return FALSE; rd->n_sp_lines = n_lines; } return r; } vbi_service_set vbi3_raw_decoder_services (vbi3_raw_decoder * rd) { assert (NULL != rd); return rd->services; } /** * $param rd Pointer to a vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(). * $param sp New sampling parameters. * $param strict See vbi3_raw_decoder_add_services(). * * Changes the sampling parameters used by $a rd. This will * remove all services which have been added with * vbi3_raw_decoder_add_services() but cannot be decoded with * the new sampling parameters. * * $return * Set of data services $rd will be decode after the change. * Can be zero if the sampling parameters are invalid or some * other error occured. */ /* Attn: strict must be int for compatibility with libzvbi 0.2 (-1 == 0) */ vbi_service_set vbi3_raw_decoder_set_sampling_par (vbi3_raw_decoder * rd, const vbi_sampling_par * sp, int strict) { unsigned int services; assert (NULL != rd); assert (NULL != sp); services = rd->services; vbi3_raw_decoder_reset (rd); if (!_vbi_sampling_par_valid_log (sp, &rd->log)) { CLEAR (rd->sampling); return 0; } rd->sampling = *sp; /* Error ignored. */ vbi3_raw_decoder_debug (rd, rd->debug); return vbi3_raw_decoder_add_services (rd, services, strict); } /** * $param rd Pointer to a vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(). * $param sp Sampling parameters will be stored here. * * Returns sampling parameters used by $a rd. */ void vbi3_raw_decoder_get_sampling_par (const vbi3_raw_decoder * rd, vbi_sampling_par * sp) { assert (NULL != rd); assert (NULL != sp); *sp = rd->sampling; } void vbi3_raw_decoder_set_log_fn (vbi3_raw_decoder * rd, vbi_log_fn * log_fn, void *user_data, vbi_log_mask mask) { unsigned int i; assert (NULL != rd); if (NULL == log_fn) mask = 0; rd->log.mask = mask; rd->log.fn = log_fn; rd->log.user_data = user_data; for (i = 0; i < _VBI3_RAW_DECODER_MAX_JOBS; ++i) { vbi3_bit_slicer_set_log_fn (&rd->jobs[i].slicer, mask, log_fn, user_data); } } /** * @internal * * Free all resources associated with @a rd. */ void _vbi3_raw_decoder_destroy (vbi3_raw_decoder * rd) { vbi3_raw_decoder_reset (rd); vbi3_raw_decoder_debug (rd, FALSE); /* Make unusable. */ CLEAR (*rd); } /** * @internal * * See vbi3_raw_decoder_new(). */ vbi_bool _vbi3_raw_decoder_init (vbi3_raw_decoder * rd, const vbi_sampling_par * sp) { CLEAR (*rd); vbi3_raw_decoder_reset (rd); if (NULL != sp) { if (!_vbi_sampling_par_valid_log (sp, &rd->log)) return FALSE; rd->sampling = *sp; } return TRUE; } /** * $param rd Pointer to a vbi3_raw_decoder object allocated with * vbi3_raw_decoder_new(), can be NULL * * Deletes a vbi3_raw_decoder object. */ void vbi3_raw_decoder_delete (vbi3_raw_decoder * rd) { if (NULL == rd) return; _vbi3_raw_decoder_destroy (rd); vbi_free (rd); } /** * $param sp VBI sampling parameters describing the raw VBI image * to decode, can be $c NULL. If they are negotiatable you can determine * suitable parameters with vbi_sampling_par_from_services(). You can * change the sampling parameters later with * vbi3_raw_decoder_set_sampling_par(). * * Allocates a vbi3_raw_decoder object. To actually decode data * services you must request the data with vbi3_raw_decoder_add_services(). * * $returns * NULL when out of memory or the sampling parameters are invalid, * Otherwise a pointer to an opaque vbi3_raw_decoder object which must * be deleted with vbi3_raw_decoder_delete() when done. */ vbi3_raw_decoder * vbi3_raw_decoder_new (const vbi_sampling_par * sp) { vbi3_raw_decoder *rd; rd = vbi_malloc (sizeof (*rd)); if (NULL == rd) { errno = ENOMEM; return NULL; } if (!_vbi3_raw_decoder_init (rd, sp)) { vbi_free (rd); rd = NULL; } return rd; } /* Local variables: c-set-style: K&R c-basic-offset: 8 End: */