| /* |
| * SBG (SBaGen) file format decoder |
| * Copyright (c) 2011 Nicolas George |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <time.h> |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/log.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/time_internal.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| #define SBG_SCALE (1 << 16) |
| #define DAY (24 * 60 * 60) |
| #define DAY_TS ((int64_t)DAY * AV_TIME_BASE) |
| |
| struct sbg_demuxer { |
| AVClass *class; |
| int sample_rate; |
| int frame_size; |
| int max_file_size; |
| }; |
| |
| struct sbg_string { |
| char *s; |
| char *e; |
| }; |
| |
| enum sbg_fade_type { |
| SBG_FADE_SILENCE = 0, |
| SBG_FADE_SAME = 1, |
| SBG_FADE_ADAPT = 3, |
| }; |
| |
| struct sbg_fade { |
| int8_t in, out, slide; |
| }; |
| |
| enum sbg_synth_type { |
| SBG_TYPE_NONE, |
| SBG_TYPE_SINE, |
| SBG_TYPE_NOISE, |
| SBG_TYPE_BELL, |
| SBG_TYPE_MIX, |
| SBG_TYPE_SPIN, |
| }; |
| |
| /* bell: freq constant, ampl decreases exponentially, can be approx lin */ |
| |
| struct sbg_timestamp { |
| int64_t t; |
| char type; /* 0 for relative, 'N' for now, 'T' for absolute */ |
| }; |
| |
| struct sbg_script_definition { |
| char *name; |
| int name_len; |
| int elements, nb_elements; |
| char type; /* 'S' or 'B' */ |
| }; |
| |
| struct sbg_script_synth { |
| int carrier; |
| int beat; |
| int vol; |
| enum sbg_synth_type type; |
| struct { |
| int l, r; |
| } ref; |
| }; |
| |
| struct sbg_script_tseq { |
| struct sbg_timestamp ts; |
| char *name; |
| int name_len; |
| int lock; |
| struct sbg_fade fade; |
| }; |
| |
| struct sbg_script_event { |
| int64_t ts; |
| int64_t ts_int, ts_trans, ts_next; |
| int elements, nb_elements; |
| struct sbg_fade fade; |
| }; |
| |
| struct sbg_script { |
| struct sbg_script_definition *def; |
| struct sbg_script_synth *synth; |
| struct sbg_script_tseq *tseq; |
| struct sbg_script_tseq *block_tseq; |
| struct sbg_script_event *events; |
| int nb_def; |
| int nb_tseq; |
| int nb_events; |
| int nb_synth; |
| int64_t start_ts; |
| int64_t end_ts; |
| int64_t opt_fade_time; |
| int64_t opt_duration; |
| char *opt_mix; |
| int sample_rate; |
| uint8_t opt_start_at_first; |
| uint8_t opt_end_at_last; |
| }; |
| |
| struct sbg_parser { |
| void *log; |
| char *script, *end; |
| char *cursor; |
| struct sbg_script scs; |
| struct sbg_timestamp current_time; |
| int nb_block_tseq; |
| int nb_def_max, nb_synth_max, nb_tseq_max, nb_block_tseq_max; |
| int line_no; |
| char err_msg[128]; |
| }; |
| |
| enum ws_interval_type { |
| WS_SINE = MKTAG('S','I','N','E'), |
| WS_NOISE = MKTAG('N','O','I','S'), |
| }; |
| |
| struct ws_interval { |
| int64_t ts1, ts2; |
| enum ws_interval_type type; |
| uint32_t channels; |
| int32_t f1, f2; |
| int32_t a1, a2; |
| uint32_t phi; |
| }; |
| |
| struct ws_intervals { |
| struct ws_interval *inter; |
| int nb_inter; |
| int max_inter; |
| }; |
| |
| static void *alloc_array_elem(void **array, size_t elsize, |
| int *size, int *max_size) |
| { |
| void *ret; |
| |
| if (*size == *max_size) { |
| int m = FFMAX(32, FFMIN(*max_size, INT_MAX / 2) * 2); |
| if (*size >= m) |
| return NULL; |
| *array = av_realloc_f(*array, m, elsize); |
| if (!*array) |
| return NULL; |
| *max_size = m; |
| } |
| ret = (char *)*array + elsize * *size; |
| memset(ret, 0, elsize); |
| (*size)++; |
| return ret; |
| } |
| |
| static int str_to_time(const char *str, int64_t *rtime) |
| { |
| const char *cur = str; |
| char *end; |
| int hours, minutes; |
| double seconds = 0; |
| |
| if (*cur < '0' || *cur > '9') |
| return 0; |
| hours = strtol(cur, &end, 10); |
| if (end == cur || *end != ':' || end[1] < '0' || end[1] > '9') |
| return 0; |
| cur = end + 1; |
| minutes = strtol(cur, &end, 10); |
| if (end == cur) |
| return 0; |
| cur = end; |
| if (*end == ':'){ |
| seconds = strtod(cur + 1, &end); |
| if (end > cur + 1) |
| cur = end; |
| } |
| *rtime = (hours * 3600LL + minutes * 60LL + seconds) * AV_TIME_BASE; |
| return cur - str; |
| } |
| |
| static inline int is_space(char c) |
| { |
| return c == ' ' || c == '\t' || c == '\r'; |
| } |
| |
| static inline int scale_double(void *log, double d, double m, int *r) |
| { |
| m *= d * SBG_SCALE; |
| if (m < INT_MIN || m >= INT_MAX) { |
| if (log) |
| av_log(log, AV_LOG_ERROR, "%g is too large\n", d); |
| return AVERROR(EDOM); |
| } |
| *r = m; |
| return 0; |
| } |
| |
| static int lex_space(struct sbg_parser *p) |
| { |
| char *c = p->cursor; |
| |
| while (p->cursor < p->end && is_space(*p->cursor)) |
| p->cursor++; |
| return p->cursor > c; |
| } |
| |
| static int lex_char(struct sbg_parser *p, char c) |
| { |
| int r = p->cursor < p->end && *p->cursor == c; |
| |
| p->cursor += r; |
| return r; |
| } |
| |
| static int lex_double(struct sbg_parser *p, double *r) |
| { |
| double d; |
| char *end; |
| |
| if (p->cursor == p->end || is_space(*p->cursor) || *p->cursor == '\n') |
| return 0; |
| d = strtod(p->cursor, &end); |
| if (end > p->cursor) { |
| *r = d; |
| p->cursor = end; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int lex_fixed(struct sbg_parser *p, const char *t, int l) |
| { |
| if (p->end - p->cursor < l || memcmp(p->cursor, t, l)) |
| return 0; |
| p->cursor += l; |
| return 1; |
| } |
| |
| static int lex_line_end(struct sbg_parser *p) |
| { |
| if (p->cursor < p->end && *p->cursor == '#') { |
| p->cursor++; |
| while (p->cursor < p->end && *p->cursor != '\n') |
| p->cursor++; |
| } |
| if (p->cursor == p->end) |
| /* simulate final LF for files lacking it */ |
| return 1; |
| if (*p->cursor != '\n') |
| return 0; |
| p->cursor++; |
| p->line_no++; |
| lex_space(p); |
| return 1; |
| } |
| |
| static int lex_wsword(struct sbg_parser *p, struct sbg_string *rs) |
| { |
| char *s = p->cursor, *c = s; |
| |
| if (s == p->end || *s == '\n') |
| return 0; |
| while (c < p->end && *c != '\n' && !is_space(*c)) |
| c++; |
| rs->s = s; |
| rs->e = p->cursor = c; |
| lex_space(p); |
| return 1; |
| } |
| |
| static int lex_name(struct sbg_parser *p, struct sbg_string *rs) |
| { |
| char *s = p->cursor, *c = s; |
| |
| while (c < p->end && ((*c >= 'a' && *c <= 'z') || (*c >= 'A' && *c <= 'Z') |
| || (*c >= '0' && *c <= '9') || *c == '_' || *c == '-')) |
| c++; |
| if (c == s) |
| return 0; |
| rs->s = s; |
| rs->e = p->cursor = c; |
| return 1; |
| } |
| |
| static int lex_time(struct sbg_parser *p, int64_t *rt) |
| { |
| int r = str_to_time(p->cursor, rt); |
| p->cursor += r; |
| return r > 0; |
| } |
| |
| #define FORWARD_ERROR(c) \ |
| do { \ |
| int errcode = c; \ |
| if (errcode <= 0) \ |
| return errcode ? errcode : AVERROR_INVALIDDATA; \ |
| } while (0) |
| |
| static int parse_immediate(struct sbg_parser *p) |
| { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "immediate sequences not yet implemented"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| static int parse_preprogrammed(struct sbg_parser *p) |
| { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "preprogrammed sequences not yet implemented"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| static int parse_optarg(struct sbg_parser *p, char o, struct sbg_string *r) |
| { |
| if (!lex_wsword(p, r)) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "option '%c' requires an argument", o); |
| return AVERROR_INVALIDDATA; |
| } |
| return 1; |
| } |
| |
| static int parse_options(struct sbg_parser *p) |
| { |
| struct sbg_string ostr, oarg; |
| char mode = 0; |
| int r; |
| char *tptr; |
| double v; |
| |
| if (p->cursor == p->end || *p->cursor != '-') |
| return 0; |
| while (lex_char(p, '-') && lex_wsword(p, &ostr)) { |
| for (; ostr.s < ostr.e; ostr.s++) { |
| char opt = *ostr.s; |
| switch (opt) { |
| case 'S': |
| p->scs.opt_start_at_first = 1; |
| break; |
| case 'E': |
| p->scs.opt_end_at_last = 1; |
| break; |
| case 'i': |
| mode = 'i'; |
| break; |
| case 'p': |
| mode = 'p'; |
| break; |
| case 'F': |
| FORWARD_ERROR(parse_optarg(p, opt, &oarg)); |
| v = strtod(oarg.s, &tptr); |
| if (oarg.e != tptr) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "syntax error for option -F"); |
| return AVERROR_INVALIDDATA; |
| } |
| p->scs.opt_fade_time = v * AV_TIME_BASE / 1000; |
| break; |
| case 'L': |
| FORWARD_ERROR(parse_optarg(p, opt, &oarg)); |
| r = str_to_time(oarg.s, &p->scs.opt_duration); |
| if (oarg.e != oarg.s + r) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "syntax error for option -L"); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| case 'T': |
| FORWARD_ERROR(parse_optarg(p, opt, &oarg)); |
| r = str_to_time(oarg.s, &p->scs.start_ts); |
| if (oarg.e != oarg.s + r) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "syntax error for option -T"); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| case 'm': |
| FORWARD_ERROR(parse_optarg(p, opt, &oarg)); |
| tptr = av_malloc(oarg.e - oarg.s + 1); |
| if (!tptr) |
| return AVERROR(ENOMEM); |
| memcpy(tptr, oarg.s, oarg.e - oarg.s); |
| tptr[oarg.e - oarg.s] = 0; |
| av_free(p->scs.opt_mix); |
| p->scs.opt_mix = tptr; |
| break; |
| case 'q': |
| FORWARD_ERROR(parse_optarg(p, opt, &oarg)); |
| v = strtod(oarg.s, &tptr); |
| if (oarg.e != tptr) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "syntax error for option -q"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (v != 1) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "speed factor other than 1 not supported"); |
| return AVERROR_PATCHWELCOME; |
| } |
| break; |
| case 'r': |
| FORWARD_ERROR(parse_optarg(p, opt, &oarg)); |
| r = strtol(oarg.s, &tptr, 10); |
| if (oarg.e != tptr) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "syntax error for option -r"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (r < 40) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "invalid sample rate"); |
| return AVERROR_PATCHWELCOME; |
| } |
| p->scs.sample_rate = r; |
| break; |
| default: |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "unknown option: '%c'", *ostr.s); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| } |
| switch (mode) { |
| case 'i': |
| return parse_immediate(p); |
| case 'p': |
| return parse_preprogrammed(p); |
| case 0: |
| if (!lex_line_end(p)) |
| return AVERROR_INVALIDDATA; |
| return 1; |
| } |
| return AVERROR_BUG; |
| } |
| |
| static int parse_timestamp(struct sbg_parser *p, |
| struct sbg_timestamp *rts, int64_t *rrel) |
| { |
| int64_t abs = 0, rel = 0, dt; |
| char type = 0; |
| int r; |
| |
| if (lex_fixed(p, "NOW", 3)) { |
| type = 'N'; |
| r = 1; |
| } else { |
| r = lex_time(p, &abs); |
| if (r) |
| type = 'T'; |
| } |
| while (lex_char(p, '+')) { |
| if (!lex_time(p, &dt)) |
| return AVERROR_INVALIDDATA; |
| if (av_sat_add64(rel, dt) - dt != rel) |
| return AVERROR_INVALIDDATA; |
| rel += dt; |
| r = 1; |
| } |
| if (r) { |
| if (!lex_space(p)) |
| return AVERROR_INVALIDDATA; |
| rts->type = type; |
| rts->t = abs; |
| *rrel = rel; |
| } |
| return r; |
| } |
| |
| static int parse_fade(struct sbg_parser *p, struct sbg_fade *fr) |
| { |
| struct sbg_fade f = {0}; |
| |
| if (lex_char(p, '<')) |
| f.in = SBG_FADE_SILENCE; |
| else if (lex_char(p, '-')) |
| f.in = SBG_FADE_SAME; |
| else if (lex_char(p, '=')) |
| f.in = SBG_FADE_ADAPT; |
| else |
| return 0; |
| if (lex_char(p, '>')) |
| f.out = SBG_FADE_SILENCE; |
| else if (lex_char(p, '-')) |
| f.out = SBG_FADE_SAME; |
| else if (lex_char(p, '=')) |
| f.out = SBG_FADE_ADAPT; |
| else |
| return AVERROR_INVALIDDATA; |
| *fr = f; |
| return 1; |
| } |
| |
| static int parse_time_sequence(struct sbg_parser *p, int inblock) |
| { |
| struct sbg_timestamp ts; |
| int64_t rel_ts; |
| int r; |
| struct sbg_fade fade = { SBG_FADE_SAME, SBG_FADE_SAME, 0 }; |
| struct sbg_string name; |
| struct sbg_script_tseq *tseq; |
| |
| r = parse_timestamp(p, &ts, &rel_ts); |
| if (!r) |
| return 0; |
| if (r < 0) |
| return r; |
| if (ts.type) { |
| if (inblock) |
| return AVERROR_INVALIDDATA; |
| p->current_time.type = ts.type; |
| p->current_time.t = ts.t; |
| } else if(!inblock && !p->current_time.type) { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "relative time without previous absolute time"); |
| return AVERROR_INVALIDDATA; |
| } |
| ts.type = p->current_time.type; |
| |
| if (av_sat_add64(p->current_time.t, rel_ts) != p->current_time.t + (uint64_t)rel_ts) |
| return AVERROR_INVALIDDATA; |
| ts.t = p->current_time.t + rel_ts; |
| r = parse_fade(p, &fade); |
| if (r < 0) |
| return r; |
| lex_space(p); |
| if (!lex_name(p, &name)) |
| return AVERROR_INVALIDDATA; |
| lex_space(p); |
| if (lex_fixed(p, "->", 2)) { |
| fade.slide = SBG_FADE_ADAPT; |
| lex_space(p); |
| } |
| if (!lex_line_end(p)) |
| return AVERROR_INVALIDDATA; |
| tseq = inblock ? |
| alloc_array_elem((void **)&p->scs.block_tseq, sizeof(*tseq), |
| &p->nb_block_tseq, &p->nb_block_tseq_max) : |
| alloc_array_elem((void **)&p->scs.tseq, sizeof(*tseq), |
| &p->scs.nb_tseq, &p->nb_tseq_max); |
| if (!tseq) |
| return AVERROR(ENOMEM); |
| tseq->ts = ts; |
| tseq->name = name.s; |
| tseq->name_len = name.e - name.s; |
| tseq->fade = fade; |
| return 1; |
| } |
| |
| static int parse_wave_def(struct sbg_parser *p, int wavenum) |
| { |
| snprintf(p->err_msg, sizeof(p->err_msg), |
| "waveform definitions not yet implemented"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| static int parse_block_def(struct sbg_parser *p, |
| struct sbg_script_definition *def) |
| { |
| int r, tseq; |
| |
| lex_space(p); |
| if (!lex_line_end(p)) |
| return AVERROR_INVALIDDATA; |
| tseq = p->nb_block_tseq; |
| while (1) { |
| r = parse_time_sequence(p, 1); |
| if (r < 0) |
| return r; |
| if (!r) |
| break; |
| } |
| if (!lex_char(p, '}')) |
| return AVERROR_INVALIDDATA; |
| lex_space(p); |
| if (!lex_line_end(p)) |
| return AVERROR_INVALIDDATA; |
| def->type = 'B'; |
| def->elements = tseq; |
| def->nb_elements = p->nb_block_tseq - tseq; |
| if (!def->nb_elements) |
| return AVERROR_INVALIDDATA; |
| return 1; |
| } |
| |
| static int parse_volume(struct sbg_parser *p, int *vol) |
| { |
| double v; |
| |
| if (!lex_char(p, '/')) |
| return 0; |
| if (!lex_double(p, &v)) |
| return AVERROR_INVALIDDATA; |
| if (scale_double(p->log, v, 0.01, vol)) |
| return AVERROR(ERANGE); |
| return 1; |
| } |
| |
| static int parse_synth_channel_sine(struct sbg_parser *p, |
| struct sbg_script_synth *synth) |
| { |
| double carrierf, beatf; |
| int carrier, beat, vol; |
| |
| if (!lex_double(p, &carrierf)) |
| return 0; |
| if (!lex_double(p, &beatf)) |
| beatf = 0; |
| FORWARD_ERROR(parse_volume(p, &vol)); |
| if (scale_double(p->log, carrierf, 1, &carrier) < 0 || |
| scale_double(p->log, beatf, 1, &beat) < 0) |
| return AVERROR(EDOM); |
| synth->type = SBG_TYPE_SINE; |
| synth->carrier = carrier; |
| synth->beat = beat; |
| synth->vol = vol; |
| return 1; |
| } |
| |
| static int parse_synth_channel_pink(struct sbg_parser *p, |
| struct sbg_script_synth *synth) |
| { |
| int vol; |
| |
| if (!lex_fixed(p, "pink", 4)) |
| return 0; |
| FORWARD_ERROR(parse_volume(p, &vol)); |
| synth->type = SBG_TYPE_NOISE; |
| synth->vol = vol; |
| return 1; |
| } |
| |
| static int parse_synth_channel_bell(struct sbg_parser *p, |
| struct sbg_script_synth *synth) |
| { |
| double carrierf; |
| int carrier, vol; |
| |
| if (!lex_fixed(p, "bell", 4)) |
| return 0; |
| if (!lex_double(p, &carrierf)) |
| return AVERROR_INVALIDDATA; |
| FORWARD_ERROR(parse_volume(p, &vol)); |
| if (scale_double(p->log, carrierf, 1, &carrier) < 0) |
| return AVERROR(EDOM); |
| synth->type = SBG_TYPE_BELL; |
| synth->carrier = carrier; |
| synth->vol = vol; |
| return 1; |
| } |
| |
| static int parse_synth_channel_mix(struct sbg_parser *p, |
| struct sbg_script_synth *synth) |
| { |
| int vol; |
| |
| if (!lex_fixed(p, "mix", 3)) |
| return 0; |
| FORWARD_ERROR(parse_volume(p, &vol)); |
| synth->type = SBG_TYPE_MIX; |
| synth->vol = vol; |
| return 1; |
| } |
| |
| static int parse_synth_channel_spin(struct sbg_parser *p, |
| struct sbg_script_synth *synth) |
| { |
| double carrierf, beatf; |
| int carrier, beat, vol; |
| |
| if (!lex_fixed(p, "spin:", 5)) |
| return 0; |
| if (!lex_double(p, &carrierf)) |
| return AVERROR_INVALIDDATA; |
| if (!lex_double(p, &beatf)) |
| return AVERROR_INVALIDDATA; |
| FORWARD_ERROR(parse_volume(p, &vol)); |
| if (scale_double(p->log, carrierf, 1, &carrier) < 0 || |
| scale_double(p->log, beatf, 1, &beat) < 0) |
| return AVERROR(EDOM); |
| synth->type = SBG_TYPE_SPIN; |
| synth->carrier = carrier; |
| synth->beat = beat; |
| synth->vol = vol; |
| return 1; |
| } |
| |
| static int parse_synth_channel(struct sbg_parser *p) |
| { |
| int r; |
| struct sbg_script_synth *synth; |
| |
| synth = alloc_array_elem((void **)&p->scs.synth, sizeof(*synth), |
| &p->scs.nb_synth, &p->nb_synth_max); |
| if (!synth) |
| return AVERROR(ENOMEM); |
| r = lex_char(p, '-'); |
| if (!r) |
| r = parse_synth_channel_pink(p, synth); |
| if (!r) |
| r = parse_synth_channel_bell(p, synth); |
| if (!r) |
| r = parse_synth_channel_mix(p, synth); |
| if (!r) |
| r = parse_synth_channel_spin(p, synth); |
| /* Unimplemented: wave%d:%f%f/vol (carrier, beat) */ |
| if (!r) |
| r = parse_synth_channel_sine(p, synth); |
| if (r <= 0) |
| p->scs.nb_synth--; |
| return r; |
| } |
| |
| static int parse_synth_def(struct sbg_parser *p, |
| struct sbg_script_definition *def) |
| { |
| int r, synth; |
| |
| synth = p->scs.nb_synth; |
| while (1) { |
| r = parse_synth_channel(p); |
| if (r < 0) |
| return r; |
| if (!r || !lex_space(p)) |
| break; |
| } |
| lex_space(p); |
| if (synth == p->scs.nb_synth) |
| return AVERROR_INVALIDDATA; |
| if (!lex_line_end(p)) |
| return AVERROR_INVALIDDATA; |
| def->type = 'S'; |
| def->elements = synth; |
| def->nb_elements = p->scs.nb_synth - synth; |
| return 1; |
| } |
| |
| static int parse_named_def(struct sbg_parser *p) |
| { |
| char *cursor_save = p->cursor; |
| struct sbg_string name; |
| struct sbg_script_definition *def; |
| |
| if (!lex_name(p, &name) || !lex_char(p, ':') || !lex_space(p)) { |
| p->cursor = cursor_save; |
| return 0; |
| } |
| if (name.e - name.s == 6 && !memcmp(name.s, "wave", 4) && |
| name.s[4] >= '0' && name.s[4] <= '9' && |
| name.s[5] >= '0' && name.s[5] <= '9') { |
| int wavenum = (name.s[4] - '0') * 10 + (name.s[5] - '0'); |
| return parse_wave_def(p, wavenum); |
| } |
| def = alloc_array_elem((void **)&p->scs.def, sizeof(*def), |
| &p->scs.nb_def, &p->nb_def_max); |
| if (!def) |
| return AVERROR(ENOMEM); |
| def->name = name.s; |
| def->name_len = name.e - name.s; |
| if (lex_char(p, '{')) |
| return parse_block_def(p, def); |
| return parse_synth_def(p, def); |
| } |
| |
| static void free_script(struct sbg_script *s) |
| { |
| av_freep(&s->def); |
| av_freep(&s->synth); |
| av_freep(&s->tseq); |
| av_freep(&s->block_tseq); |
| av_freep(&s->events); |
| av_freep(&s->opt_mix); |
| } |
| |
| static int parse_script(void *log, char *script, int script_len, |
| struct sbg_script *rscript) |
| { |
| struct sbg_parser sp = { |
| .log = log, |
| .script = script, |
| .end = script + script_len, |
| .cursor = script, |
| .line_no = 1, |
| .err_msg = "", |
| .scs = { |
| /* default values */ |
| .start_ts = AV_NOPTS_VALUE, |
| .sample_rate = 44100, |
| .opt_fade_time = 60 * AV_TIME_BASE, |
| }, |
| }; |
| int r; |
| |
| lex_space(&sp); |
| while (sp.cursor < sp.end) { |
| r = parse_options(&sp); |
| if (r < 0) |
| goto fail; |
| if (!r && !lex_line_end(&sp)) |
| break; |
| } |
| while (sp.cursor < sp.end) { |
| r = parse_named_def(&sp); |
| if (!r) |
| r = parse_time_sequence(&sp, 0); |
| if (!r) |
| r = lex_line_end(&sp) ? 1 : AVERROR_INVALIDDATA; |
| if (r < 0) |
| goto fail; |
| } |
| *rscript = sp.scs; |
| return 1; |
| fail: |
| free_script(&sp.scs); |
| if (!*sp.err_msg) |
| if (r == AVERROR_INVALIDDATA) |
| snprintf(sp.err_msg, sizeof(sp.err_msg), "syntax error"); |
| if (log && *sp.err_msg) { |
| const char *ctx = sp.cursor; |
| const char *ectx = av_x_if_null(memchr(ctx, '\n', sp.end - sp.cursor), |
| sp.end); |
| int lctx = ectx - ctx; |
| const char *quote = "\""; |
| if (lctx > 0 && ctx[lctx - 1] == '\r') |
| lctx--; |
| if (lctx == 0) { |
| ctx = "the end of line"; |
| lctx = strlen(ctx); |
| quote = ""; |
| } |
| av_log(log, AV_LOG_ERROR, "Error line %d: %s near %s%.*s%s.\n", |
| sp.line_no, sp.err_msg, quote, lctx, ctx, quote); |
| } |
| return r; |
| } |
| |
| static int read_whole_file(AVIOContext *io, int max_size, char **rbuf) |
| { |
| char *buf = NULL; |
| int size = 0, bufsize = 0, r; |
| |
| while (1) { |
| if (bufsize - size < 1024) { |
| bufsize = FFMIN(FFMAX(2 * bufsize, 8192), max_size); |
| if (bufsize - size < 2) { |
| size = AVERROR(EFBIG); |
| goto fail; |
| } |
| buf = av_realloc_f(buf, bufsize, 1); |
| if (!buf) { |
| size = AVERROR(ENOMEM); |
| goto fail; |
| } |
| } |
| r = avio_read(io, buf, bufsize - size - 1); |
| if (r == AVERROR_EOF) |
| break; |
| if (r < 0) |
| goto fail; |
| size += r; |
| } |
| buf[size] = 0; |
| *rbuf = buf; |
| return size; |
| fail: |
| av_free(buf); |
| return size; |
| } |
| |
| static void expand_timestamps(void *log, struct sbg_script *s) |
| { |
| int i, nb_rel = 0; |
| int64_t now, cur_ts, delta = 0; |
| |
| for (i = 0; i < s->nb_tseq; i++) |
| nb_rel += s->tseq[i].ts.type == 'N'; |
| if (nb_rel == s->nb_tseq) { |
| /* All ts are relative to NOW: consider NOW = 0 */ |
| now = 0; |
| if (s->start_ts != AV_NOPTS_VALUE) |
| av_log(log, AV_LOG_WARNING, |
| "Start time ignored in a purely relative script.\n"); |
| } else if (nb_rel == 0 && s->start_ts != AV_NOPTS_VALUE || |
| s->opt_start_at_first) { |
| /* All ts are absolute and start time is specified */ |
| if (s->start_ts == AV_NOPTS_VALUE) |
| s->start_ts = s->tseq[0].ts.t; |
| now = s->start_ts; |
| } else { |
| /* Mixed relative/absolute ts: expand */ |
| time_t now0; |
| struct tm *tm, tmpbuf; |
| |
| av_log(log, AV_LOG_WARNING, |
| "Scripts with mixed absolute and relative timestamps can give " |
| "unexpected results (pause, seeking, time zone change).\n"); |
| #undef time |
| time(&now0); |
| tm = localtime_r(&now0, &tmpbuf); |
| now = tm ? tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec : |
| now0 % DAY; |
| av_log(log, AV_LOG_INFO, "Using %02d:%02d:%02d as NOW.\n", |
| (int)(now / 3600), (int)(now / 60) % 60, (int)now % 60); |
| now *= AV_TIME_BASE; |
| for (i = 0; i < s->nb_tseq; i++) { |
| if (s->tseq[i].ts.type == 'N') { |
| s->tseq[i].ts.t += now; |
| s->tseq[i].ts.type = 'T'; /* not necessary */ |
| } |
| } |
| } |
| if (s->start_ts == AV_NOPTS_VALUE) |
| s->start_ts = (s->opt_start_at_first && s->tseq) ? s->tseq[0].ts.t : now; |
| s->end_ts = s->opt_duration ? s->start_ts + s->opt_duration : |
| AV_NOPTS_VALUE; /* may be overridden later by -E option */ |
| cur_ts = now; |
| for (i = 0; i < s->nb_tseq; i++) { |
| if (s->tseq[i].ts.t + delta < cur_ts) |
| delta += DAY_TS; |
| cur_ts = s->tseq[i].ts.t += delta; |
| } |
| } |
| |
| static int expand_tseq(void *log, struct sbg_script *s, int *nb_ev_max, |
| int64_t t0, struct sbg_script_tseq *tseq) |
| { |
| int i, r; |
| struct sbg_script_definition *def; |
| struct sbg_script_tseq *be; |
| struct sbg_script_event *ev; |
| |
| if (tseq->lock++) { |
| av_log(log, AV_LOG_ERROR, "Recursion loop on \"%.*s\"\n", |
| tseq->name_len, tseq->name); |
| return AVERROR(EINVAL); |
| } |
| t0 += tseq->ts.t; |
| for (i = 0; i < s->nb_def; i++) { |
| if (s->def[i].name_len == tseq->name_len && |
| !memcmp(s->def[i].name, tseq->name, tseq->name_len)) |
| break; |
| } |
| if (i >= s->nb_def) { |
| av_log(log, AV_LOG_ERROR, "Tone-set \"%.*s\" not defined\n", |
| tseq->name_len, tseq->name); |
| return AVERROR(EINVAL); |
| } |
| def = &s->def[i]; |
| if (def->type == 'B') { |
| be = s->block_tseq + def->elements; |
| for (i = 0; i < def->nb_elements; i++) { |
| r = expand_tseq(log, s, nb_ev_max, t0, &be[i]); |
| if (r < 0) |
| return r; |
| } |
| } else { |
| ev = alloc_array_elem((void **)&s->events, sizeof(*ev), |
| &s->nb_events, nb_ev_max); |
| if (!ev) |
| return AVERROR(ENOMEM); |
| ev->ts = tseq->ts.t; |
| ev->elements = def->elements; |
| ev->nb_elements = def->nb_elements; |
| ev->fade = tseq->fade; |
| } |
| tseq->lock--; |
| return 0; |
| } |
| |
| static int expand_script(void *log, struct sbg_script *s) |
| { |
| int i, r, nb_events_max = 0; |
| |
| expand_timestamps(log, s); |
| for (i = 0; i < s->nb_tseq; i++) { |
| r = expand_tseq(log, s, &nb_events_max, 0, &s->tseq[i]); |
| if (r < 0) |
| return r; |
| } |
| if (!s->nb_events) { |
| av_log(log, AV_LOG_ERROR, "No events in script\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (s->opt_end_at_last) |
| s->end_ts = s->events[s->nb_events - 1].ts; |
| return 0; |
| } |
| |
| static int add_interval(struct ws_intervals *inter, |
| enum ws_interval_type type, uint32_t channels, int ref, |
| int64_t ts1, int32_t f1, int32_t a1, |
| int64_t ts2, int32_t f2, int32_t a2) |
| { |
| struct ws_interval *i, *ri; |
| |
| if (ref >= 0) { |
| ri = &inter->inter[ref]; |
| /* ref and new intervals are constant, identical and adjacent */ |
| if (ri->type == type && ri->channels == channels && |
| ri->f1 == ri->f2 && ri->f2 == f1 && f1 == f2 && |
| ri->a1 == ri->a2 && ri->a2 == a1 && a1 == a2 && |
| ri->ts2 == ts1) { |
| ri->ts2 = ts2; |
| return ref; |
| } |
| } |
| i = alloc_array_elem((void **)&inter->inter, sizeof(*i), |
| &inter->nb_inter, &inter->max_inter); |
| if (!i) |
| return AVERROR(ENOMEM); |
| i->ts1 = ts1; |
| i->ts2 = ts2; |
| i->type = type; |
| i->channels = channels; |
| i->f1 = f1; |
| i->f2 = f2; |
| i->a1 = a1; |
| i->a2 = a2; |
| i->phi = ref >= 0 ? ref | 0x80000000 : 0; |
| return i - inter->inter; |
| } |
| |
| static int add_bell(struct ws_intervals *inter, struct sbg_script *s, |
| int64_t ts1, int64_t ts2, int32_t f, int32_t a) |
| { |
| /* SBaGen uses an exponential decrease every 50ms. |
| We approximate it with piecewise affine segments. */ |
| int32_t cpoints[][2] = { |
| { 2, a }, |
| { 4, a - a / 4 }, |
| { 8, a / 2 }, |
| { 16, a / 4 }, |
| { 25, a / 10 }, |
| { 50, a / 80 }, |
| { 75, 0 }, |
| }; |
| int i, r; |
| int64_t dt = s->sample_rate / 20, ts3 = ts1, ts4; |
| for (i = 0; i < FF_ARRAY_ELEMS(cpoints); i++) { |
| ts4 = FFMIN(ts2, ts1 + cpoints[i][0] * dt); |
| r = add_interval(inter, WS_SINE, 3, -1, |
| ts3, f, a, ts4, f, cpoints[i][1]); |
| if (r < 0) |
| return r; |
| ts3 = ts4; |
| a = cpoints[i][1]; |
| } |
| return 0; |
| } |
| |
| static int generate_interval(void *log, struct sbg_script *s, |
| struct ws_intervals *inter, |
| int64_t ts1, int64_t ts2, |
| struct sbg_script_synth *s1, |
| struct sbg_script_synth *s2, |
| int transition) |
| { |
| int r; |
| |
| if (ts2 <= ts1 || (s1->vol == 0 && s2->vol == 0)) |
| return 0; |
| switch (s1->type) { |
| case SBG_TYPE_NONE: |
| break; |
| case SBG_TYPE_SINE: |
| if (s1->beat == 0 && s2->beat == 0) { |
| r = add_interval(inter, WS_SINE, 3, s1->ref.l, |
| ts1, s1->carrier, s1->vol, |
| ts2, s2->carrier, s2->vol); |
| if (r < 0) |
| return r; |
| s2->ref.l = s2->ref.r = r; |
| } else { |
| r = add_interval(inter, WS_SINE, 1, s1->ref.l, |
| ts1, s1->carrier + s1->beat / 2, s1->vol, |
| ts2, s2->carrier + s2->beat / 2, s2->vol); |
| if (r < 0) |
| return r; |
| s2->ref.l = r; |
| r = add_interval(inter, WS_SINE, 2, s1->ref.r, |
| ts1, s1->carrier - s1->beat / 2, s1->vol, |
| ts2, s2->carrier - s2->beat / 2, s2->vol); |
| if (r < 0) |
| return r; |
| s2->ref.r = r; |
| } |
| break; |
| |
| case SBG_TYPE_BELL: |
| if (transition == 2) { |
| r = add_bell(inter, s, ts1, ts2, s1->carrier, s2->vol); |
| if (r < 0) |
| return r; |
| } |
| break; |
| |
| case SBG_TYPE_SPIN: |
| av_log(log, AV_LOG_WARNING, "Spinning noise not implemented, " |
| "using pink noise instead.\n"); |
| /* fall through */ |
| case SBG_TYPE_NOISE: |
| /* SBaGen's pink noise generator uses: |
| - 1 band of white noise, mean square: 1/3; |
| - 9 bands of subsampled white noise with linear |
| interpolation, mean square: 2/3 each; |
| with 1/10 weight each: the total mean square is 7/300. |
| Our pink noise generator uses 8 bands of white noise with |
| rectangular subsampling: the total mean square is 1/24. |
| Therefore, to match SBaGen's volume, we must multiply vol by |
| sqrt((7/300) / (1/24)) = sqrt(14/25) =~ 0.748 |
| */ |
| r = add_interval(inter, WS_NOISE, 3, s1->ref.l, |
| ts1, 0, s1->vol - s1->vol / 4, |
| ts2, 0, s2->vol - s2->vol / 4); |
| if (r < 0) |
| return r; |
| s2->ref.l = s2->ref.r = r; |
| break; |
| |
| case SBG_TYPE_MIX: |
| /* Unimplemented: silence; warning present elsewhere */ |
| default: |
| av_log(log, AV_LOG_ERROR, |
| "Type %d is not implemented\n", s1->type); |
| return AVERROR_PATCHWELCOME; |
| } |
| return 0; |
| } |
| |
| static int generate_plateau(void *log, struct sbg_script *s, |
| struct ws_intervals *inter, |
| struct sbg_script_event *ev1) |
| { |
| int64_t ts1 = ev1->ts_int, ts2 = ev1->ts_trans; |
| int i, r; |
| struct sbg_script_synth *s1; |
| |
| for (i = 0; i < ev1->nb_elements; i++) { |
| s1 = &s->synth[ev1->elements + i]; |
| r = generate_interval(log, s, inter, ts1, ts2, s1, s1, 0); |
| if (r < 0) |
| return r; |
| } |
| return 0; |
| } |
| |
| /* |
| |
| ts1 ts2 ts1 tsmid ts2 |
| | | | | | |
| v v v | v |
| ____ ____ v ____ |
| ''''.... ''.. ..'' |
| ''''....____ ''....'' |
| |
| compatible transition incompatible transition |
| */ |
| |
| static int generate_transition(void *log, struct sbg_script *s, |
| struct ws_intervals *inter, |
| struct sbg_script_event *ev1, |
| struct sbg_script_event *ev2) |
| { |
| int64_t ts1 = ev1->ts_trans, ts2 = ev1->ts_next; |
| /* (ts1 + ts2) / 2 without overflow */ |
| int64_t tsmid = (ts1 >> 1) + (ts2 >> 1) + (ts1 & ts2 & 1); |
| enum sbg_fade_type type = ev1->fade.slide | (ev1->fade.out & ev2->fade.in); |
| int nb_elements = FFMAX(ev1->nb_elements, ev2->nb_elements); |
| struct sbg_script_synth *s1, *s2, s1mod, s2mod, smid; |
| int pass, i, r; |
| |
| for (pass = 0; pass < 2; pass++) { |
| /* pass = 0 -> compatible and first half of incompatible |
| pass = 1 -> second half of incompatible |
| Using two passes like that ensures that the intervals are generated |
| in increasing order according to their start timestamp. |
| Otherwise it would be necessary to sort them |
| while keeping the mutual references. |
| */ |
| for (i = 0; i < nb_elements; i++) { |
| s1 = i < ev1->nb_elements ? &s->synth[ev1->elements + i] : &s1mod; |
| s2 = i < ev2->nb_elements ? &s->synth[ev2->elements + i] : &s2mod; |
| s1mod = s1 != &s1mod ? *s1 : (struct sbg_script_synth){ 0 }; |
| s2mod = s2 != &s2mod ? *s2 : (struct sbg_script_synth){ 0 }; |
| if (ev1->fade.slide) { |
| /* for slides, and only for slides, silence ("-") is equivalent |
| to anything with volume 0 */ |
| if (s1mod.type == SBG_TYPE_NONE) { |
| s1mod = s2mod; |
| s1mod.vol = 0; |
| } else if (s2mod.type == SBG_TYPE_NONE) { |
| s2mod = s1mod; |
| s2mod.vol = 0; |
| } |
| } |
| if (s1mod.type == s2mod.type && |
| s1mod.type != SBG_TYPE_BELL && |
| (type == SBG_FADE_ADAPT || |
| (s1mod.carrier == s2mod.carrier && |
| s1mod.beat == s2mod.beat))) { |
| /* compatible: single transition */ |
| if (!pass) { |
| r = generate_interval(log, s, inter, |
| ts1, ts2, &s1mod, &s2mod, 3); |
| if (r < 0) |
| return r; |
| s2->ref = s2mod.ref; |
| } |
| } else { |
| /* incompatible: silence at midpoint */ |
| if (!pass) { |
| smid = s1mod; |
| smid.vol = 0; |
| r = generate_interval(log, s, inter, |
| ts1, tsmid, &s1mod, &smid, 1); |
| if (r < 0) |
| return r; |
| } else { |
| smid = s2mod; |
| smid.vol = 0; |
| r = generate_interval(log, s, inter, |
| tsmid, ts2, &smid, &s2mod, 2); |
| if (r < 0) |
| return r; |
| s2->ref = s2mod.ref; |
| } |
| } |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| ev1 trats ev2 intts endts ev3 |
| | | | | | | |
| v v v v v v |
| ________________ |
| .... .... .... |
| '''....________________....''' '''...._______________ |
| |
| \_________/\______________/\_________/\______________/\_________/\_____________/ |
| tr x->1 int1 tr 1->2 int2 tr 2->3 int3 |
| */ |
| |
| static int generate_intervals(void *log, struct sbg_script *s, int sample_rate, |
| struct ws_intervals *inter) |
| { |
| int64_t trans_time = s->opt_fade_time / 2; |
| struct sbg_script_event ev0, *ev1, *ev2; |
| int64_t period; |
| int i, r; |
| |
| /* SBaGen handles the time before and after the extremal events, |
| and the corresponding transitions, as if the sequence were cyclic |
| with a 24-hours period. */ |
| period = s->events[s->nb_events - 1].ts - s->events[0].ts; |
| period = (period + (DAY_TS - 1)) / DAY_TS * DAY_TS; |
| period = FFMAX(period, DAY_TS); |
| |
| /* Prepare timestamps for transitions */ |
| for (i = 0; i < s->nb_events; i++) { |
| ev1 = &s->events[i]; |
| ev2 = &s->events[(i + 1) % s->nb_events]; |
| ev1->ts_int = ev1->ts; |
| ev1->ts_trans = ev1->fade.slide ? ev1->ts |
| : ev2->ts + (ev1 < ev2 ? 0 : period); |
| } |
| for (i = 0; i < s->nb_events; i++) { |
| ev1 = &s->events[i]; |
| ev2 = &s->events[(i + 1) % s->nb_events]; |
| if (!ev1->fade.slide) { |
| ev1->ts_trans = FFMAX(ev1->ts_int, ev1->ts_trans - trans_time); |
| ev2->ts_int = FFMIN(ev2->ts_trans, ev2->ts_int + trans_time); |
| } |
| ev1->ts_next = ev2->ts_int + (ev1 < ev2 ? 0 : period); |
| } |
| |
| /* Pseudo event before the first one */ |
| ev0 = s->events[s->nb_events - 1]; |
| ev0.ts_int -= period; |
| ev0.ts_trans -= period; |
| ev0.ts_next -= period; |
| |
| /* Convert timestamps */ |
| for (i = -1; i < s->nb_events; i++) { |
| ev1 = i < 0 ? &ev0 : &s->events[i]; |
| ev1->ts_int = av_rescale(ev1->ts_int, sample_rate, AV_TIME_BASE); |
| ev1->ts_trans = av_rescale(ev1->ts_trans, sample_rate, AV_TIME_BASE); |
| ev1->ts_next = av_rescale(ev1->ts_next, sample_rate, AV_TIME_BASE); |
| } |
| |
| /* Generate intervals */ |
| for (i = 0; i < s->nb_synth; i++) |
| s->synth[i].ref.l = s->synth[i].ref.r = -1; |
| for (i = -1; i < s->nb_events; i++) { |
| ev1 = i < 0 ? &ev0 : &s->events[i]; |
| ev2 = &s->events[(i + 1) % s->nb_events]; |
| r = generate_plateau(log, s, inter, ev1); |
| if (r < 0) |
| return r; |
| r = generate_transition(log, s, inter, ev1, ev2); |
| if (r < 0) |
| return r; |
| } |
| if (!inter->nb_inter) |
| av_log(log, AV_LOG_WARNING, "Completely silent script.\n"); |
| return 0; |
| } |
| |
| static int encode_intervals(struct sbg_script *s, AVCodecParameters *par, |
| struct ws_intervals *inter) |
| { |
| int i, edata_size = 4, ret; |
| uint8_t *edata; |
| |
| for (i = 0; i < inter->nb_inter; i++) { |
| edata_size += inter->inter[i].type == WS_SINE ? 44 : |
| inter->inter[i].type == WS_NOISE ? 32 : 0; |
| if (edata_size < 0) |
| return AVERROR(ENOMEM); |
| } |
| if ((ret = ff_alloc_extradata(par, edata_size)) < 0) |
| return ret; |
| edata = par->extradata; |
| |
| #define ADD_EDATA32(v) do { AV_WL32(edata, (v)); edata += 4; } while(0) |
| #define ADD_EDATA64(v) do { AV_WL64(edata, (v)); edata += 8; } while(0) |
| ADD_EDATA32(inter->nb_inter); |
| for (i = 0; i < inter->nb_inter; i++) { |
| ADD_EDATA64(inter->inter[i].ts1); |
| ADD_EDATA64(inter->inter[i].ts2); |
| ADD_EDATA32(inter->inter[i].type); |
| ADD_EDATA32(inter->inter[i].channels); |
| switch (inter->inter[i].type) { |
| case WS_SINE: |
| ADD_EDATA32(inter->inter[i].f1); |
| ADD_EDATA32(inter->inter[i].f2); |
| ADD_EDATA32(inter->inter[i].a1); |
| ADD_EDATA32(inter->inter[i].a2); |
| ADD_EDATA32(inter->inter[i].phi); |
| break; |
| case WS_NOISE: |
| ADD_EDATA32(inter->inter[i].a1); |
| ADD_EDATA32(inter->inter[i].a2); |
| break; |
| } |
| } |
| if (edata != par->extradata + edata_size) |
| return AVERROR_BUG; |
| return 0; |
| } |
| |
| static av_cold int sbg_read_probe(const AVProbeData *p) |
| { |
| int r, score; |
| struct sbg_script script = { 0 }; |
| |
| r = parse_script(NULL, p->buf, p->buf_size, &script); |
| score = r < 0 || !script.nb_def || !script.nb_tseq ? 0 : |
| AVPROBE_SCORE_MAX / 3; |
| free_script(&script); |
| return score; |
| } |
| |
| static av_cold int sbg_read_header(AVFormatContext *avf) |
| { |
| struct sbg_demuxer *sbg = avf->priv_data; |
| int r; |
| char *buf = NULL; |
| struct sbg_script script = { 0 }; |
| AVStream *st; |
| struct ws_intervals inter = { 0 }; |
| |
| r = read_whole_file(avf->pb, sbg->max_file_size, &buf); |
| if (r < 0) |
| goto fail; |
| r = parse_script(avf, buf, r, &script); |
| if (r < 0) |
| goto fail; |
| if (!sbg->sample_rate) |
| sbg->sample_rate = script.sample_rate; |
| else |
| script.sample_rate = sbg->sample_rate; |
| if (!sbg->frame_size) |
| sbg->frame_size = FFMAX(1, sbg->sample_rate / 10); |
| if (script.opt_mix) |
| av_log(avf, AV_LOG_WARNING, "Mix feature not implemented: " |
| "-m is ignored and mix channels will be silent.\n"); |
| r = expand_script(avf, &script); |
| if (r < 0) |
| goto fail; |
| av_freep(&buf); |
| r = generate_intervals(avf, &script, sbg->sample_rate, &inter); |
| if (r < 0) |
| goto fail; |
| |
| if (script.end_ts != AV_NOPTS_VALUE && script.end_ts < script.start_ts) { |
| r = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| st = avformat_new_stream(avf, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_FFWAVESYNTH; |
| st->codecpar->channels = 2; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
| st->codecpar->sample_rate = sbg->sample_rate; |
| st->codecpar->frame_size = sbg->frame_size; |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| st->probe_packets = 0; |
| st->start_time = av_rescale(script.start_ts, |
| sbg->sample_rate, AV_TIME_BASE); |
| st->duration = script.end_ts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE : |
| av_rescale(script.end_ts - script.start_ts, |
| sbg->sample_rate, AV_TIME_BASE); |
| st->cur_dts = st->start_time; |
| r = encode_intervals(&script, st->codecpar, &inter); |
| if (r < 0) |
| goto fail; |
| |
| av_free(inter.inter); |
| free_script(&script); |
| return 0; |
| |
| fail: |
| av_free(inter.inter); |
| free_script(&script); |
| av_free(buf); |
| return r; |
| } |
| |
| static int sbg_read_packet(AVFormatContext *avf, AVPacket *packet) |
| { |
| int64_t ts, end_ts; |
| int ret; |
| |
| ts = avf->streams[0]->cur_dts; |
| end_ts = ts + avf->streams[0]->codecpar->frame_size; |
| if (avf->streams[0]->duration != AV_NOPTS_VALUE) |
| end_ts = FFMIN(avf->streams[0]->start_time + avf->streams[0]->duration, |
| end_ts); |
| if (end_ts <= ts) |
| return AVERROR_EOF; |
| if ((ret = av_new_packet(packet, 12)) < 0) |
| return ret; |
| packet->dts = packet->pts = ts; |
| packet->duration = end_ts - ts; |
| AV_WL64(packet->data + 0, ts); |
| AV_WL32(packet->data + 8, packet->duration); |
| return packet->size; |
| } |
| |
| static int sbg_read_seek2(AVFormatContext *avf, int stream_index, |
| int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| { |
| if (flags || stream_index > 0) |
| return AVERROR(EINVAL); |
| if (stream_index < 0) |
| ts = av_rescale_q(ts, AV_TIME_BASE_Q, avf->streams[0]->time_base); |
| avf->streams[0]->cur_dts = ts; |
| return 0; |
| } |
| |
| static int sbg_read_seek(AVFormatContext *avf, int stream_index, |
| int64_t ts, int flags) |
| { |
| return sbg_read_seek2(avf, stream_index, ts, ts, ts, 0); |
| } |
| |
| static const AVOption sbg_options[] = { |
| { "sample_rate", "", offsetof(struct sbg_demuxer, sample_rate), |
| AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, |
| AV_OPT_FLAG_DECODING_PARAM }, |
| { "frame_size", "", offsetof(struct sbg_demuxer, frame_size), |
| AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, |
| AV_OPT_FLAG_DECODING_PARAM }, |
| { "max_file_size", "", offsetof(struct sbg_demuxer, max_file_size), |
| AV_OPT_TYPE_INT, { .i64 = 5000000 }, 0, INT_MAX, |
| AV_OPT_FLAG_DECODING_PARAM }, |
| { NULL }, |
| }; |
| |
| static const AVClass sbg_demuxer_class = { |
| .class_name = "sbg_demuxer", |
| .item_name = av_default_item_name, |
| .option = sbg_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVInputFormat ff_sbg_demuxer = { |
| .name = "sbg", |
| .long_name = NULL_IF_CONFIG_SMALL("SBaGen binaural beats script"), |
| .priv_data_size = sizeof(struct sbg_demuxer), |
| .read_probe = sbg_read_probe, |
| .read_header = sbg_read_header, |
| .read_packet = sbg_read_packet, |
| .read_seek = sbg_read_seek, |
| .read_seek2 = sbg_read_seek2, |
| .extensions = "sbg", |
| .priv_class = &sbg_demuxer_class, |
| }; |
