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avfilter/af_pan: reject expressions referencing the same channel multiple times 

Fixes parsing of expressions like c0=c0+c0 or c0=c0|c0=c1.  Previously no
error was thrown and for input channels, only the last gain factor was used,
for output channels the source channel gains were combined.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2018-03-24 22:57:34 +01:00
parent 0031eab61c
commit 084ef7d7d5
1 changed files with 16 additions and 0 deletions
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16
libavfilter/af_pan.c
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@ -104,6 +104,7 @@ static av_cold int init(AVFilterContext *ctx)
char *arg, *arg0, *tokenizer, *args = av_strdup(pan->args);
int out_ch_id, in_ch_id, len, named, ret, sign = 1;
int nb_in_channels[2] = { 0, 0 }; // number of unnamed and named input channels
int used_out_ch[MAX_CHANNELS] = {0};
double gain;
if (!pan->args) {
@ -127,6 +128,7 @@ static av_cold int init(AVFilterContext *ctx)
/* parse channel specifications */
while ((arg = arg0 = av_strtok(NULL, "|", &tokenizer))) {
int used_in_ch[MAX_CHANNELS] = {0};
/* channel name */
if (parse_channel_name(&arg, &out_ch_id, &named)) {
av_log(ctx, AV_LOG_ERROR,
@ -153,6 +155,13 @@ static av_cold int init(AVFilterContext *ctx)
ret = AVERROR(EINVAL);
goto fail;
}
if (used_out_ch[out_ch_id]) {
av_log(ctx, AV_LOG_ERROR,
"Can not reference out channel %d twice\n", out_ch_id);
ret = AVERROR(EINVAL);
goto fail;
}
used_out_ch[out_ch_id] = 1;
skip_spaces(&arg);
if (*arg == '=') {
arg++;
@ -184,6 +193,13 @@ static av_cold int init(AVFilterContext *ctx)
ret = AVERROR(EINVAL);
goto fail;
}
if (used_in_ch[in_ch_id]) {
av_log(ctx, AV_LOG_ERROR,
"Can not reference in channel %d twice\n", in_ch_id);
ret = AVERROR(EINVAL);
goto fail;
}
used_in_ch[in_ch_id] = 1;
pan->gain[out_ch_id][in_ch_id] = sign * gain;
skip_spaces(&arg);
if (!*arg)