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libmodplug: simpler and faster use of eval expr.

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This commit is contained in:
Clément Bœsch 2011-10-10 21:09:30 +02:00
parent d377deaaa3
commit 964465eb1a
1 changed files with 10 additions and 13 deletions
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23
libavformat/libmodplug.c
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@ -55,7 +55,7 @@ typedef struct ModPlugContext {
int fsize; ///< constant frame size
int linesize; ///< line size in bytes
char *color_eval; ///< color eval user input expression
int eval_err; ///< 1 if eval failed once, otherwise 0 (used to disable video)
AVExpr *expr; ///< parsed color eval expression
} ModPlugContext;
static const char *var_names[] = {
@ -167,7 +167,7 @@ static int modplug_read_header(AVFormatContext *s, AVFormatParameters *ap)
AVIOContext *pb = s->pb;
ModPlug_Settings settings;
ModPlugContext *modplug = s->priv_data;
int sz = avio_size(pb);
int r, sz = avio_size(pb);
if (sz < 0) {
av_log(s, AV_LOG_WARNING, "Could not determine file size\n");
@ -178,6 +178,12 @@ static int modplug_read_header(AVFormatContext *s, AVFormatParameters *ap)
"but demuxing is likely to fail due to incomplete buffer\n",
sz == FF_MODPLUG_DEF_FILE_SIZE ? " (see -max_size)" : "", sz);
}
r = av_expr_parse(&modplug->expr, modplug->color_eval, var_names,
NULL, NULL, NULL, NULL, 0, s);
if (r < 0)
return r;
modplug->buf = av_malloc(modplug->max_size);
if (!modplug->buf)
return AVERROR(ENOMEM);
@ -294,23 +300,14 @@ static int modplug_read_packet(AVFormatContext *s, AVPacket *pkt)
PRINT_INFO(5, "ts", VAR_TIME);
}
if (modplug->color_eval && !modplug->eval_err) {
if (modplug->expr) {
int x, y;
for (y = 0; y < modplug->h; y++) {
for (x = 0; x < modplug->w; x++) {
double color;
var_values[VAR_X] = x;
var_values[VAR_Y] = y;
if (av_expr_parse_and_eval(&color, modplug->color_eval,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, s) < 0) {
av_log(s, AV_LOG_ERROR,
"Error while evaluating the expression '%s' with x=%d y=%d\n",
modplug->color_eval, x, y);
modplug->eval_err = 1;
return 0;
}
color = av_expr_eval(modplug->expr, var_values, NULL);
pkt->data[y*modplug->linesize + x*3 + 2] |= av_clip((int)color, 0, 0xf)<<4;
}
}