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/*
* LGPL
*/
/**
* @file opts.c
* options parser.
* typical parsed command line:
* msmpeg4:bitrate=720000:qmax=16
*
*/
#include "avcodec.h"
extern const AVOption common_options[2];
const AVOption common_options[2] = {
AVOPTION_CODEC_INT("common", "test", bit_rate, 0, 10, 0),
AVOPTION_END()
};
static int parse_bool(const AVOption *c, char *s, int *var)
{
int b = 1; /* by default -on- when present */
if (s) {
if (!strcasecmp(s, "off") || !strcasecmp(s, "false")
|| !strcmp(s, "0"))
b = 0;
else if (!strcasecmp(s, "on") || !strcasecmp(s, "true")
|| !strcmp(s, "1"))
b = 1;
else
return -1;
}
*var = b;
return 0;
}
static int parse_double(const AVOption *c, char *s, double *var)
{
double d;
if (!s)
return -1;
d = atof(s);
if (c->min != c->max) {
if (d < c->min || d > c->max) {
fprintf(stderr, "Option: %s double value: %f out of range <%f, %f>\n",
c->name, d, c->min, c->max);
return -1;
}
}
*var = d;
return 0;
}
static int parse_int(const AVOption* c, char* s, int* var)
{
int i;
if (!s)
return -1;
i = atoi(s);
if (c->min != c->max) {
if (i < (int)c->min || i > (int)c->max) {
fprintf(stderr, "Option: %s integer value: %d out of range <%d, %d>\n",
c->name, i, (int)c->min, (int)c->max);
return -1;
}
}
*var = i;
return 0;
}
static int parse_string(const AVOption *c, char *s, AVCodecContext *avctx, char **var)
{
if (!s)
return -1;
if (c->type == FF_OPT_TYPE_RCOVERRIDE) {
int sf, ef, qs;
float qf;
if (sscanf(s, "%d,%d,%d,%f", &sf, &ef, &qs, &qf) == 4 && sf < ef) {
RcOverride *o;
avctx->rc_override = av_realloc(avctx->rc_override,
sizeof(RcOverride) * (avctx->rc_override_count + 1));
o = avctx->rc_override + avctx->rc_override_count++;
o->start_frame = sf;
o->end_frame = ef;
o->qscale = qs;
o->quality_factor = qf;
//printf("parsed Rc: %d,%d,%d,%f (%d)\n", sf,ef,qs,qf, avctx->rc_override_count);
} else {
printf("incorrect/unparsable Rc: \"%s\"\n", s);
}
} else
*var = av_strdup(s);
return 0;
}
/**
*
* \param codec codec for option parsing
* \param opts string with options for parsing
* \param avctx where to store parsed results
*/
int avcodec_parse(const AVCodec *codec, const char *opts, AVCodecContext *avctx)
{
int r = 0;
char* dopts = av_strdup(opts);
if (dopts) {
char *str = dopts;
while (str && *str && r == 0) {
const AVOption *stack[FF_OPT_MAX_DEPTH];
int depth = 0;
const AVOption *c = codec->options;
char* e = strchr(str, ':');
char* p;
if (e)
*e++ = 0;
p = strchr(str, '=');
if (p)
*p++ = 0;
// going through option structures
for (;;) {
if (!c->name) {
if (c->sub) {
stack[depth++] = c;
c = c->sub;
assert(depth > FF_OPT_MAX_DEPTH);
} else {
if (depth == 0)
break; // finished
c = stack[--depth];
c++;
}
} else {
if (!strcmp(c->name, str)) {
void* ptr = (char*)avctx + c->offset;
switch (c->type & FF_OPT_TYPE_MASK) {
case FF_OPT_TYPE_BOOL:
r = parse_bool(c, p, (int*)ptr);
break;
case FF_OPT_TYPE_DOUBLE:
r = parse_double(c, p, (double*)ptr);
break;
case FF_OPT_TYPE_INT:
r = parse_int(c, p, (int*)ptr);
break;
case FF_OPT_TYPE_STRING:
r = parse_string(c, p, avctx, (char**)ptr);
break;
default:
assert(0 == 1);
}
}
c++;
}
}
str = e;
}
av_free(dopts);
}
return r;
}
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