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sbgdec.c
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/*
* 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/bprint.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/time_internal.h"
#include "avformat.h"
#include "demux.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;
int64_t ts = 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;
ts = av_clipd(seconds * AV_TIME_BASE, INT64_MIN/2, INT64_MAX/2);
}
*rtime = av_sat_add64((hours * 3600LL + minutes * 60LL) * AV_TIME_BASE, ts);
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 || p->scs.opt_duration < 0) {
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, AVBPrint *rbuf)
{
int ret = avio_read_to_bprint(io, rbuf, max_size);
if (ret < 0)
return ret;
if (!av_bprint_is_complete(rbuf))
return AVERROR(ENOMEM);
/* Check if we have read the whole file. AVIOContext.eof_reached is only
* set after a read failed due to EOF, so this check is incorrect in case
* max_size equals the actual file size, but checking for that would
* require attempting to read beyond max_size. */
if (!io->eof_reached)
return AVERROR(EFBIG);
return 0;
}
static int 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;
if (s->start_ts > INT64_MAX - s->opt_duration)
return AVERROR_INVALIDDATA;
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 (av_sat_add64(s->tseq[i].ts.t, delta) != s->tseq[i].ts.t + (uint64_t)delta)
return AVERROR_INVALIDDATA;
if (s->tseq[i].ts.t + delta < cur_ts)
delta += DAY_TS;
cur_ts = s->tseq[i].ts.t += delta;
}
return 0;
}
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);
}
if (t0 + (uint64_t)tseq->ts.t != av_sat_add64(t0, tseq->ts.t))
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;
r = expand_timestamps(log, s);
if (r < 0)
return r;
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;