mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
1513 lines
45 KiB
C
1513 lines
45 KiB
C
/*
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* SBG (SBaGen) file format decoder
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* Copyright (c) 2011 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "libavutil/intreadwrite.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "libavutil/time_internal.h"
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#include "avformat.h"
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#include "internal.h"
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#define SBG_SCALE (1 << 16)
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#define DAY (24 * 60 * 60)
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#define DAY_TS ((int64_t)DAY * AV_TIME_BASE)
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struct sbg_demuxer {
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AVClass *class;
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int sample_rate;
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int frame_size;
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int max_file_size;
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};
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struct sbg_string {
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char *s;
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char *e;
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};
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enum sbg_fade_type {
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SBG_FADE_SILENCE = 0,
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SBG_FADE_SAME = 1,
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SBG_FADE_ADAPT = 3,
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};
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struct sbg_fade {
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int8_t in, out, slide;
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};
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enum sbg_synth_type {
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SBG_TYPE_NONE,
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SBG_TYPE_SINE,
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SBG_TYPE_NOISE,
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SBG_TYPE_BELL,
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SBG_TYPE_MIX,
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SBG_TYPE_SPIN,
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};
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/* bell: freq constant, ampl decreases exponentially, can be approx lin */
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struct sbg_timestamp {
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int64_t t;
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char type; /* 0 for relative, 'N' for now, 'T' for absolute */
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};
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struct sbg_script_definition {
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char *name;
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int name_len;
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int elements, nb_elements;
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char type; /* 'S' or 'B' */
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};
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struct sbg_script_synth {
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int carrier;
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int beat;
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int vol;
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enum sbg_synth_type type;
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struct {
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int l, r;
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} ref;
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};
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struct sbg_script_tseq {
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struct sbg_timestamp ts;
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char *name;
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int name_len;
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int lock;
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struct sbg_fade fade;
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};
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struct sbg_script_event {
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int64_t ts;
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int64_t ts_int, ts_trans, ts_next;
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int elements, nb_elements;
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struct sbg_fade fade;
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};
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struct sbg_script {
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struct sbg_script_definition *def;
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struct sbg_script_synth *synth;
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struct sbg_script_tseq *tseq;
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struct sbg_script_tseq *block_tseq;
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struct sbg_script_event *events;
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int nb_def;
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int nb_tseq;
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int nb_events;
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int nb_synth;
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int64_t start_ts;
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int64_t end_ts;
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int64_t opt_fade_time;
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int64_t opt_duration;
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char *opt_mix;
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int sample_rate;
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uint8_t opt_start_at_first;
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uint8_t opt_end_at_last;
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};
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struct sbg_parser {
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void *log;
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char *script, *end;
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char *cursor;
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struct sbg_script scs;
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struct sbg_timestamp current_time;
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int nb_block_tseq;
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int nb_def_max, nb_synth_max, nb_tseq_max, nb_block_tseq_max;
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int line_no;
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char err_msg[128];
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};
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enum ws_interval_type {
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WS_SINE = MKTAG('S','I','N','E'),
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WS_NOISE = MKTAG('N','O','I','S'),
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};
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struct ws_interval {
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int64_t ts1, ts2;
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enum ws_interval_type type;
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uint32_t channels;
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int32_t f1, f2;
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int32_t a1, a2;
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uint32_t phi;
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};
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struct ws_intervals {
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struct ws_interval *inter;
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int nb_inter;
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int max_inter;
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};
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static void *alloc_array_elem(void **array, size_t elsize,
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int *size, int *max_size)
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{
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void *ret;
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if (*size == *max_size) {
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int m = FFMAX(32, FFMIN(*max_size, INT_MAX / 2) * 2);
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if (*size >= m)
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return NULL;
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*array = av_realloc_f(*array, m, elsize);
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if (!*array)
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return NULL;
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*max_size = m;
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}
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ret = (char *)*array + elsize * *size;
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memset(ret, 0, elsize);
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(*size)++;
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return ret;
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}
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static int str_to_time(const char *str, int64_t *rtime)
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{
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const char *cur = str;
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char *end;
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int hours, minutes;
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double seconds = 0;
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if (*cur < '0' || *cur > '9')
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return 0;
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hours = strtol(cur, &end, 10);
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if (end == cur || *end != ':' || end[1] < '0' || end[1] > '9')
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return 0;
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cur = end + 1;
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minutes = strtol(cur, &end, 10);
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if (end == cur)
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return 0;
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cur = end;
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if (*end == ':'){
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seconds = strtod(cur + 1, &end);
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if (end > cur + 1)
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cur = end;
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}
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*rtime = (hours * 3600 + minutes * 60 + seconds) * AV_TIME_BASE;
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return cur - str;
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}
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static inline int is_space(char c)
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{
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return c == ' ' || c == '\t' || c == '\r';
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}
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static inline int scale_double(void *log, double d, double m, int *r)
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{
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m *= d * SBG_SCALE;
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if (m < INT_MIN || m >= INT_MAX) {
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if (log)
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av_log(log, AV_LOG_ERROR, "%g is too large\n", d);
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return AVERROR(EDOM);
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}
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*r = m;
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return 0;
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}
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static int lex_space(struct sbg_parser *p)
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{
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char *c = p->cursor;
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while (p->cursor < p->end && is_space(*p->cursor))
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p->cursor++;
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return p->cursor > c;
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}
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static int lex_char(struct sbg_parser *p, char c)
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{
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int r = p->cursor < p->end && *p->cursor == c;
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p->cursor += r;
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return r;
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}
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static int lex_double(struct sbg_parser *p, double *r)
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{
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double d;
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char *end;
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if (p->cursor == p->end || is_space(*p->cursor) || *p->cursor == '\n')
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return 0;
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d = strtod(p->cursor, &end);
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if (end > p->cursor) {
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*r = d;
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p->cursor = end;
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return 1;
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}
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return 0;
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}
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static int lex_fixed(struct sbg_parser *p, const char *t, int l)
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{
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if (p->end - p->cursor < l || memcmp(p->cursor, t, l))
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return 0;
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p->cursor += l;
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return 1;
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}
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static int lex_line_end(struct sbg_parser *p)
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{
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if (p->cursor < p->end && *p->cursor == '#') {
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p->cursor++;
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while (p->cursor < p->end && *p->cursor != '\n')
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p->cursor++;
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}
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if (p->cursor == p->end)
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/* simulate final LF for files lacking it */
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return 1;
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if (*p->cursor != '\n')
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return 0;
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p->cursor++;
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p->line_no++;
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lex_space(p);
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return 1;
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}
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static int lex_wsword(struct sbg_parser *p, struct sbg_string *rs)
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{
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char *s = p->cursor, *c = s;
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if (s == p->end || *s == '\n')
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return 0;
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while (c < p->end && *c != '\n' && !is_space(*c))
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c++;
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rs->s = s;
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rs->e = p->cursor = c;
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lex_space(p);
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return 1;
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}
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static int lex_name(struct sbg_parser *p, struct sbg_string *rs)
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{
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char *s = p->cursor, *c = s;
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while (c < p->end && ((*c >= 'a' && *c <= 'z') || (*c >= 'A' && *c <= 'Z')
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|| (*c >= '0' && *c <= '9') || *c == '_' || *c == '-'))
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c++;
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if (c == s)
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return 0;
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rs->s = s;
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rs->e = p->cursor = c;
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return 1;
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}
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static int lex_time(struct sbg_parser *p, int64_t *rt)
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{
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int r = str_to_time(p->cursor, rt);
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p->cursor += r;
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return r > 0;
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}
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#define FORWARD_ERROR(c) \
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do { \
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int errcode = c; \
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if (errcode <= 0) \
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return errcode ? errcode : AVERROR_INVALIDDATA; \
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} while(0);
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static int parse_immediate(struct sbg_parser *p)
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{
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snprintf(p->err_msg, sizeof(p->err_msg),
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"immediate sequences not yet implemented");
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return AVERROR_PATCHWELCOME;
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}
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static int parse_preprogrammed(struct sbg_parser *p)
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{
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snprintf(p->err_msg, sizeof(p->err_msg),
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"preprogrammed sequences not yet implemented");
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return AVERROR_PATCHWELCOME;
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}
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static int parse_optarg(struct sbg_parser *p, char o, struct sbg_string *r)
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{
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if (!lex_wsword(p, r)) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"option '%c' requires an argument", o);
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return AVERROR_INVALIDDATA;
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}
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return 1;
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}
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static int parse_options(struct sbg_parser *p)
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{
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struct sbg_string ostr, oarg;
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char mode = 0;
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int r;
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char *tptr;
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double v;
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if (p->cursor == p->end || *p->cursor != '-')
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return 0;
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while (lex_char(p, '-') && lex_wsword(p, &ostr)) {
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for (; ostr.s < ostr.e; ostr.s++) {
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char opt = *ostr.s;
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switch (opt) {
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case 'S':
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p->scs.opt_start_at_first = 1;
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break;
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case 'E':
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p->scs.opt_end_at_last = 1;
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break;
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case 'i':
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mode = 'i';
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break;
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case 'p':
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mode = 'p';
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break;
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case 'F':
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FORWARD_ERROR(parse_optarg(p, opt, &oarg));
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v = strtod(oarg.s, &tptr);
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if (oarg.e != tptr) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"syntax error for option -F");
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return AVERROR_INVALIDDATA;
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}
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p->scs.opt_fade_time = v * AV_TIME_BASE / 1000;
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break;
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case 'L':
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FORWARD_ERROR(parse_optarg(p, opt, &oarg));
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r = str_to_time(oarg.s, &p->scs.opt_duration);
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if (oarg.e != oarg.s + r) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"syntax error for option -L");
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return AVERROR_INVALIDDATA;
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}
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break;
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case 'T':
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FORWARD_ERROR(parse_optarg(p, opt, &oarg));
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r = str_to_time(oarg.s, &p->scs.start_ts);
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if (oarg.e != oarg.s + r) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"syntax error for option -T");
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return AVERROR_INVALIDDATA;
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}
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break;
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case 'm':
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FORWARD_ERROR(parse_optarg(p, opt, &oarg));
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tptr = av_malloc(oarg.e - oarg.s + 1);
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if (!tptr)
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return AVERROR(ENOMEM);
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memcpy(tptr, oarg.s, oarg.e - oarg.s);
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tptr[oarg.e - oarg.s] = 0;
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av_free(p->scs.opt_mix);
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p->scs.opt_mix = tptr;
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break;
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case 'q':
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FORWARD_ERROR(parse_optarg(p, opt, &oarg));
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v = strtod(oarg.s, &tptr);
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if (oarg.e != tptr) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"syntax error for option -q");
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return AVERROR_INVALIDDATA;
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}
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if (v != 1) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"speed factor other than 1 not supported");
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return AVERROR_PATCHWELCOME;
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}
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break;
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case 'r':
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FORWARD_ERROR(parse_optarg(p, opt, &oarg));
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r = strtol(oarg.s, &tptr, 10);
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if (oarg.e != tptr) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"syntax error for option -r");
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return AVERROR_INVALIDDATA;
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}
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if (r < 40) {
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snprintf(p->err_msg, sizeof(p->err_msg),
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"invalid sample rate");
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return AVERROR_PATCHWELCOME;
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}
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p->scs.sample_rate = r;
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break;
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default:
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snprintf(p->err_msg, sizeof(p->err_msg),
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"unknown option: '%c'", *ostr.s);
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return AVERROR_INVALIDDATA;
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}
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}
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}
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switch (mode) {
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case 'i':
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return parse_immediate(p);
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case 'p':
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return parse_preprogrammed(p);
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case 0:
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if (!lex_line_end(p))
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return AVERROR_INVALIDDATA;
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return 1;
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}
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return AVERROR_BUG;
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}
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static int parse_timestamp(struct sbg_parser *p,
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struct sbg_timestamp *rts, int64_t *rrel)
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{
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int64_t abs = 0, rel = 0, dt;
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char type = 0;
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int r;
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if (lex_fixed(p, "NOW", 3)) {
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type = 'N';
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r = 1;
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} else {
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r = lex_time(p, &abs);
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if (r)
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type = 'T';
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}
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while (lex_char(p, '+')) {
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if (!lex_time(p, &dt))
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return AVERROR_INVALIDDATA;
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rel += dt;
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r = 1;
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}
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if (r) {
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if (!lex_space(p))
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return AVERROR_INVALIDDATA;
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rts->type = type;
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rts->t = abs;
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*rrel = rel;
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}
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return r;
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}
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static int parse_fade(struct sbg_parser *p, struct sbg_fade *fr)
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{
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struct sbg_fade f = {0};
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if (lex_char(p, '<'))
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f.in = SBG_FADE_SILENCE;
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else if (lex_char(p, '-'))
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f.in = SBG_FADE_SAME;
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else if (lex_char(p, '='))
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f.in = SBG_FADE_ADAPT;
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else
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return 0;
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if (lex_char(p, '>'))
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f.out = SBG_FADE_SILENCE;
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else if (lex_char(p, '-'))
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f.out = SBG_FADE_SAME;
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else if (lex_char(p, '='))
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f.out = SBG_FADE_ADAPT;
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else
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return AVERROR_INVALIDDATA;
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*fr = f;
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return 1;
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}
|
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|
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static int parse_time_sequence(struct sbg_parser *p, int inblock)
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{
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struct sbg_timestamp ts;
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int64_t rel_ts;
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int r;
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struct sbg_fade fade = { SBG_FADE_SAME, SBG_FADE_SAME, 0 };
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struct sbg_string name;
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struct sbg_script_tseq *tseq;
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r = parse_timestamp(p, &ts, &rel_ts);
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if (!r)
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return 0;
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if (r < 0)
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return r;
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if (ts.type) {
|
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if (inblock)
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return AVERROR_INVALIDDATA;
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p->current_time.type = ts.type;
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p->current_time.t = ts.t;
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} else if(!inblock && !p->current_time.type) {
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snprintf(p->err_msg, sizeof(p->err_msg),
|
|
"relative time without previous absolute time");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ts.type = p->current_time.type;
|
|
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[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);
|
|
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, AVCodecContext *avc,
|
|
struct ws_intervals *inter)
|
|
{
|
|
int i, edata_size = 4;
|
|
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 (ff_alloc_extradata(avc, edata_size))
|
|
return AVERROR(ENOMEM);
|
|
edata = avc->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 != avc->extradata + edata_size)
|
|
return AVERROR_BUG;
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int sbg_read_probe(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;
|
|
|
|
st = avformat_new_stream(avf, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = AV_CODEC_ID_FFWAVESYNTH;
|
|
st->codec->channels = 2;
|
|
st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
|
|
st->codec->sample_rate = sbg->sample_rate;
|
|
st->codec->frame_size = sbg->frame_size;
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->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->codec, &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;
|
|
|
|
ts = avf->streams[0]->cur_dts;
|
|
end_ts = ts + avf->streams[0]->codec->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 (av_new_packet(packet, 12) < 0)
|
|
return AVERROR(ENOMEM);
|
|
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,
|
|
};
|