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ffmpeg/libavutil/opt.c
Stefano Sabatini d2af7205a1 Use hierarchic names convention (prefix them with av_expr) for the 
eval API.

More grep-friendly and more consistent with the rest of the FFmpeg
API.

Originally committed as revision 25708 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-11-08 14:06:49 +00:00

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/*
* AVOptions
* Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
/**
* @file
* AVOptions
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#include "avutil.h"
#include "avstring.h"
#include "opt.h"
#include "eval.h"
//FIXME order them and do a bin search
const AVOption *av_find_opt(void *v, const char *name, const char *unit, int mask, int flags)
{
AVClass *c= *(AVClass**)v; //FIXME silly way of storing AVClass
const AVOption *o= c->option;
for (; o && o->name; o++) {
if (!strcmp(o->name, name) && (!unit || (o->unit && !strcmp(o->unit, unit))) && (o->flags & mask) == flags)
return o;
}
return NULL;
}
const AVOption *av_next_option(void *obj, const AVOption *last)
{
if (last && last[1].name) return ++last;
else if (last) return NULL;
else return (*(AVClass**)obj)->option;
}
static int av_set_number2(void *obj, const char *name, double num, int den, int64_t intnum, const AVOption **o_out)
{
const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
void *dst;
if (o_out)
*o_out= o;
if (!o || o->offset<=0)
return AVERROR(ENOENT);
if (o->max*den < num*intnum || o->min*den > num*intnum) {
av_log(obj, AV_LOG_ERROR, "Value %lf for parameter '%s' out of range\n", num, name);
return AVERROR(ERANGE);
}
dst= ((uint8_t*)obj) + o->offset;
switch (o->type) {
case FF_OPT_TYPE_FLAGS:
case FF_OPT_TYPE_INT: *(int *)dst= llrint(num/den)*intnum; break;
case FF_OPT_TYPE_INT64: *(int64_t *)dst= llrint(num/den)*intnum; break;
case FF_OPT_TYPE_FLOAT: *(float *)dst= num*intnum/den; break;
case FF_OPT_TYPE_DOUBLE:*(double *)dst= num*intnum/den; break;
case FF_OPT_TYPE_RATIONAL:
if ((int)num == num) *(AVRational*)dst= (AVRational){num*intnum, den};
else *(AVRational*)dst= av_d2q(num*intnum/den, 1<<24);
break;
default:
return AVERROR(EINVAL);
}
return 0;
}
static const AVOption *av_set_number(void *obj, const char *name, double num, int den, int64_t intnum)
{
const AVOption *o = NULL;
if (av_set_number2(obj, name, num, den, intnum, &o) < 0)
return NULL;
else
return o;
}
static const double const_values[] = {
M_PI,
M_E,
FF_QP2LAMBDA,
0
};
static const char * const const_names[] = {
"PI",
"E",
"QP2LAMBDA",
0
};
static int hexchar2int(char c) {
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
return -1;
}
int av_set_string3(void *obj, const char *name, const char *val, int alloc, const AVOption **o_out)
{
int ret;
const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
if (o_out)
*o_out = o;
if (!o)
return AVERROR(ENOENT);
if (!val || o->offset<=0)
return AVERROR(EINVAL);
if (o->type == FF_OPT_TYPE_BINARY) {
uint8_t **dst = (uint8_t **)(((uint8_t*)obj) + o->offset);
int *lendst = (int *)(dst + 1);
uint8_t *bin, *ptr;
int len = strlen(val);
av_freep(dst);
*lendst = 0;
if (len & 1) return AVERROR(EINVAL);
len /= 2;
ptr = bin = av_malloc(len);
while (*val) {
int a = hexchar2int(*val++);
int b = hexchar2int(*val++);
if (a < 0 || b < 0) {
av_free(bin);
return AVERROR(EINVAL);
}
*ptr++ = (a << 4) | b;
}
*dst = bin;
*lendst = len;
return 0;
}
if (o->type != FF_OPT_TYPE_STRING) {
int notfirst=0;
for (;;) {
int i;
char buf[256];
int cmd=0;
double d;
if (*val == '+' || *val == '-')
cmd= *(val++);
for (i=0; i<sizeof(buf)-1 && val[i] && val[i]!='+' && val[i]!='-'; i++)
buf[i]= val[i];
buf[i]=0;
{
const AVOption *o_named= av_find_opt(obj, buf, o->unit, 0, 0);
if (o_named && o_named->type == FF_OPT_TYPE_CONST)
d= o_named->default_val;
else if (!strcmp(buf, "default")) d= o->default_val;
else if (!strcmp(buf, "max" )) d= o->max;
else if (!strcmp(buf, "min" )) d= o->min;
else if (!strcmp(buf, "none" )) d= 0;
else if (!strcmp(buf, "all" )) d= ~0;
else {
int res = av_expr_parse_and_eval(&d, buf, const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, obj);
if (res < 0) {
av_log(obj, AV_LOG_ERROR, "Unable to parse option value \"%s\"\n", val);
return res;
}
}
}
if (o->type == FF_OPT_TYPE_FLAGS) {
if (cmd=='+') d= av_get_int(obj, name, NULL) | (int64_t)d;
else if (cmd=='-') d= av_get_int(obj, name, NULL) &~(int64_t)d;
} else {
if (cmd=='+') d= notfirst*av_get_double(obj, name, NULL) + d;
else if (cmd=='-') d= notfirst*av_get_double(obj, name, NULL) - d;
}
if ((ret = av_set_number2(obj, name, d, 1, 1, o_out)) < 0)
return ret;
val+= i;
if (!*val)
return 0;
notfirst=1;
}
return AVERROR(EINVAL);
}
if (alloc) {
av_free(*(void**)(((uint8_t*)obj) + o->offset));
val= av_strdup(val);
}
memcpy(((uint8_t*)obj) + o->offset, &val, sizeof(val));
return 0;
}
const AVOption *av_set_double(void *obj, const char *name, double n)
{
return av_set_number(obj, name, n, 1, 1);
}
const AVOption *av_set_q(void *obj, const char *name, AVRational n)
{
return av_set_number(obj, name, n.num, n.den, 1);
}
const AVOption *av_set_int(void *obj, const char *name, int64_t n)
{
return av_set_number(obj, name, 1, 1, n);
}
/**
*
* @param buf a buffer which is used for returning non string values as strings, can be NULL
* @param buf_len allocated length in bytes of buf
*/
const char *av_get_string(void *obj, const char *name, const AVOption **o_out, char *buf, int buf_len)
{
const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
void *dst;
uint8_t *bin;
int len, i;
if (!o || o->offset<=0)
return NULL;
if (o->type != FF_OPT_TYPE_STRING && (!buf || !buf_len))
return NULL;
dst= ((uint8_t*)obj) + o->offset;
if (o_out) *o_out= o;
switch (o->type) {
case FF_OPT_TYPE_FLAGS: snprintf(buf, buf_len, "0x%08X",*(int *)dst);break;
case FF_OPT_TYPE_INT: snprintf(buf, buf_len, "%d" , *(int *)dst);break;
case FF_OPT_TYPE_INT64: snprintf(buf, buf_len, "%"PRId64, *(int64_t*)dst);break;
case FF_OPT_TYPE_FLOAT: snprintf(buf, buf_len, "%f" , *(float *)dst);break;
case FF_OPT_TYPE_DOUBLE: snprintf(buf, buf_len, "%f" , *(double *)dst);break;
case FF_OPT_TYPE_RATIONAL: snprintf(buf, buf_len, "%d/%d", ((AVRational*)dst)->num, ((AVRational*)dst)->den);break;
case FF_OPT_TYPE_STRING: return *(void**)dst;
case FF_OPT_TYPE_BINARY:
len = *(int*)(((uint8_t *)dst) + sizeof(uint8_t *));
if (len >= (buf_len + 1)/2) return NULL;
bin = *(uint8_t**)dst;
for (i = 0; i < len; i++) snprintf(buf + i*2, 3, "%02X", bin[i]);
break;
default: return NULL;
}
return buf;
}
static int av_get_number(void *obj, const char *name, const AVOption **o_out, double *num, int *den, int64_t *intnum)
{
const AVOption *o= av_find_opt(obj, name, NULL, 0, 0);
void *dst;
if (!o || o->offset<=0)
goto error;
dst= ((uint8_t*)obj) + o->offset;
if (o_out) *o_out= o;
switch (o->type) {
case FF_OPT_TYPE_FLAGS: *intnum= *(unsigned int*)dst;return 0;
case FF_OPT_TYPE_INT: *intnum= *(int *)dst;return 0;
case FF_OPT_TYPE_INT64: *intnum= *(int64_t*)dst;return 0;
case FF_OPT_TYPE_FLOAT: *num= *(float *)dst;return 0;
case FF_OPT_TYPE_DOUBLE: *num= *(double *)dst;return 0;
case FF_OPT_TYPE_RATIONAL: *intnum= ((AVRational*)dst)->num;
*den = ((AVRational*)dst)->den;
return 0;
}
error:
*den=*intnum=0;
return -1;
}
double av_get_double(void *obj, const char *name, const AVOption **o_out)
{
int64_t intnum=1;
double num=1;
int den=1;
av_get_number(obj, name, o_out, &num, &den, &intnum);
return num*intnum/den;
}
AVRational av_get_q(void *obj, const char *name, const AVOption **o_out)
{
int64_t intnum=1;
double num=1;
int den=1;
av_get_number(obj, name, o_out, &num, &den, &intnum);
if (num == 1.0 && (int)intnum == intnum)
return (AVRational){intnum, den};
else
return av_d2q(num*intnum/den, 1<<24);
}
int64_t av_get_int(void *obj, const char *name, const AVOption **o_out)
{
int64_t intnum=1;
double num=1;
int den=1;
av_get_number(obj, name, o_out, &num, &den, &intnum);
return num*intnum/den;
}
static void opt_list(void *obj, void *av_log_obj, const char *unit,
int req_flags, int rej_flags)
{
const AVOption *opt=NULL;
while ((opt= av_next_option(obj, opt))) {
if (!(opt->flags & req_flags) || (opt->flags & rej_flags))
continue;
/* Don't print CONST's on level one.
* Don't print anything but CONST's on level two.
* Only print items from the requested unit.
*/
if (!unit && opt->type==FF_OPT_TYPE_CONST)
continue;
else if (unit && opt->type!=FF_OPT_TYPE_CONST)
continue;
else if (unit && opt->type==FF_OPT_TYPE_CONST && strcmp(unit, opt->unit))
continue;
else if (unit && opt->type == FF_OPT_TYPE_CONST)
av_log(av_log_obj, AV_LOG_INFO, " %-15s ", opt->name);
else
av_log(av_log_obj, AV_LOG_INFO, "-%-17s ", opt->name);
switch (opt->type) {
case FF_OPT_TYPE_FLAGS:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<flags>");
break;
case FF_OPT_TYPE_INT:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int>");
break;
case FF_OPT_TYPE_INT64:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<int64>");
break;
case FF_OPT_TYPE_DOUBLE:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<double>");
break;
case FF_OPT_TYPE_FLOAT:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<float>");
break;
case FF_OPT_TYPE_STRING:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<string>");
break;
case FF_OPT_TYPE_RATIONAL:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<rational>");
break;
case FF_OPT_TYPE_BINARY:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "<binary>");
break;
case FF_OPT_TYPE_CONST:
default:
av_log(av_log_obj, AV_LOG_INFO, "%-7s ", "");
break;
}
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_ENCODING_PARAM) ? 'E' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_DECODING_PARAM) ? 'D' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_VIDEO_PARAM ) ? 'V' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_AUDIO_PARAM ) ? 'A' : '.');
av_log(av_log_obj, AV_LOG_INFO, "%c", (opt->flags & AV_OPT_FLAG_SUBTITLE_PARAM) ? 'S' : '.');
if (opt->help)
av_log(av_log_obj, AV_LOG_INFO, " %s", opt->help);
av_log(av_log_obj, AV_LOG_INFO, "\n");
if (opt->unit && opt->type != FF_OPT_TYPE_CONST) {
opt_list(obj, av_log_obj, opt->unit, req_flags, rej_flags);
}
}
}
int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)
{
if (!obj)
return -1;
av_log(av_log_obj, AV_LOG_INFO, "%s AVOptions:\n", (*(AVClass**)obj)->class_name);
opt_list(obj, av_log_obj, NULL, req_flags, rej_flags);
return 0;
}
/** Set the values of the AVCodecContext or AVFormatContext structure.
* They are set to the defaults specified in the according AVOption options
* array default_val field.
*
* @param s AVCodecContext or AVFormatContext for which the defaults will be set
*/
void av_opt_set_defaults2(void *s, int mask, int flags)
{
const AVOption *opt = NULL;
while ((opt = av_next_option(s, opt)) != NULL) {
if ((opt->flags & mask) != flags)
continue;
switch (opt->type) {
case FF_OPT_TYPE_CONST:
/* Nothing to be done here */
break;
case FF_OPT_TYPE_FLAGS:
case FF_OPT_TYPE_INT: {
int val;
val = opt->default_val;
av_set_int(s, opt->name, val);
}
break;
case FF_OPT_TYPE_INT64:
if ((double)(opt->default_val+0.6) == opt->default_val)
av_log(s, AV_LOG_DEBUG, "loss of precision in default of %s\n", opt->name);
av_set_int(s, opt->name, opt->default_val);
break;
case FF_OPT_TYPE_DOUBLE:
case FF_OPT_TYPE_FLOAT: {
double val;
val = opt->default_val;
av_set_double(s, opt->name, val);
}
break;
case FF_OPT_TYPE_RATIONAL: {
AVRational val;
val = av_d2q(opt->default_val, INT_MAX);
av_set_q(s, opt->name, val);
}
break;
case FF_OPT_TYPE_STRING:
case FF_OPT_TYPE_BINARY:
/* Cannot set default for string as default_val is of type * double */
break;
default:
av_log(s, AV_LOG_DEBUG, "AVOption type %d of option %s not implemented yet\n", opt->type, opt->name);
}
}
}
void av_opt_set_defaults(void *s)
{
av_opt_set_defaults2(s, 0, 0);
}
/**
* Store the value in the field in ctx that is named like key.
* ctx must be an AVClass context, storing is done using AVOptions.
*
* @param buf the string to parse, buf will be updated to point at the
* separator just after the parsed key/value pair
* @param key_val_sep a 0-terminated list of characters used to
* separate key from value
* @param pairs_sep a 0-terminated list of characters used to separate
* two pairs from each other
* @return 0 if the key/value pair has been successfully parsed and
* set, or a negative value corresponding to an AVERROR code in case
* of error:
* AVERROR(EINVAL) if the key/value pair cannot be parsed,
* the error code issued by av_set_string3() if the key/value pair
* cannot be set
*/
static int parse_key_value_pair(void *ctx, const char **buf,
const char *key_val_sep, const char *pairs_sep)
{
char *key = av_get_token(buf, key_val_sep);
char *val;
int ret;
if (*key && strspn(*buf, key_val_sep)) {
(*buf)++;
val = av_get_token(buf, pairs_sep);
} else {
av_log(ctx, AV_LOG_ERROR, "Missing key or no key/value separator found after key '%s'\n", key);
av_free(key);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_DEBUG, "Setting value '%s' for key '%s'\n", val, key);
ret = av_set_string3(ctx, key, val, 1, NULL);
if (ret == AVERROR(ENOENT))
av_log(ctx, AV_LOG_ERROR, "Key '%s' not found.\n", key);
av_free(key);
av_free(val);
return ret;
}
int av_set_options_string(void *ctx, const char *opts,
const char *key_val_sep, const char *pairs_sep)
{
int ret, count = 0;
while (*opts) {
if ((ret = parse_key_value_pair(ctx, &opts, key_val_sep, pairs_sep)) < 0)
return ret;
count++;
if (*opts)
opts++;
}
return count;
}
#ifdef TEST
#undef printf
typedef struct TestContext
{
const AVClass *class;
int num;
int toggle;
char *string;
int flags;
AVRational rational;
} TestContext;
#define OFFSET(x) offsetof(TestContext, x)
#define TEST_FLAG_COOL 01
#define TEST_FLAG_LAME 02
#define TEST_FLAG_MU 04
static const AVOption test_options[]= {
{"num", "set num", OFFSET(num), FF_OPT_TYPE_INT, 0, 0, 100 },
{"toggle", "set toggle", OFFSET(toggle), FF_OPT_TYPE_INT, 0, 0, 1 },
{"rational", "set rational", OFFSET(rational), FF_OPT_TYPE_RATIONAL, 0, 0, 10 },
{"string", "set string", OFFSET(string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
{"flags", "set flags", OFFSET(flags), FF_OPT_TYPE_FLAGS, 0, 0, INT_MAX, 0, "flags" },
{"cool", "set cool flag ", 0, FF_OPT_TYPE_CONST, TEST_FLAG_COOL, INT_MIN, INT_MAX, 0, "flags" },
{"lame", "set lame flag ", 0, FF_OPT_TYPE_CONST, TEST_FLAG_LAME, INT_MIN, INT_MAX, 0, "flags" },
{"mu", "set mu flag ", 0, FF_OPT_TYPE_CONST, TEST_FLAG_MU, INT_MIN, INT_MAX, 0, "flags" },
{NULL},
};
static const char *test_get_name(void *ctx)
{
return "test";
}
static const AVClass test_class = {
"TestContext",
test_get_name,
test_options
};
int main(void)
{
int i;
printf("\nTesting av_set_options_string()\n");
{
TestContext test_ctx;
const char *options[] = {
"",
":",
"=",
"foo=:",
":=foo",
"=foo",
"foo=",
"foo",
"foo=val",
"foo==val",
"toggle=:",
"string=:",
"toggle=1 : foo",
"toggle=100",
"toggle==1",
"flags=+mu-lame : num=42: toggle=0",
"num=42 : string=blahblah",
"rational=0 : rational=1/2 : rational=1/-1",
"rational=-1/0",
};
test_ctx.class = &test_class;
av_opt_set_defaults2(&test_ctx, 0, 0);
test_ctx.string = av_strdup("default");
av_log_set_level(AV_LOG_DEBUG);
for (i=0; i < FF_ARRAY_ELEMS(options); i++) {
av_log(&test_ctx, AV_LOG_DEBUG, "Setting options string '%s'\n", options[i]);
if (av_set_options_string(&test_ctx, options[i], "=", ":") < 0)
av_log(&test_ctx, AV_LOG_ERROR, "Error setting options string: '%s'\n", options[i]);
printf("\n");
}
}
return 0;
}
#endif
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