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af_channelmap: properly set the supported output channel layouts

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The current code expects query_formats() to be called exactly once, it
will leak if it's not called at all (filter initialized, but never
configured or used) or try to read freed memory if it's called more than
once.

Found-by: James Almer <jamrial@gmail.com>
CC: libav-stable@libav.org
This commit is contained in:
Anton Khirnov 2015-07-22 11:30:37 +02:00
parent aed7715b8f
commit 22ecfcd4c7
1 changed files with 4 additions and 4 deletions
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8
libavfilter/af_channelmap.c
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@ -57,7 +57,6 @@ enum MappingMode {
#define MAX_CH 64
typedef struct ChannelMapContext {
const AVClass *class;
AVFilterChannelLayouts *channel_layouts;
char *mapping_str;
char *channel_layout_str;
uint64_t output_layout;
@ -276,8 +275,6 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
return AVERROR(EINVAL);
}
ff_add_channel_layout(&s->channel_layouts, s->output_layout);
if (mode == MAP_PAIR_INT_STR || mode == MAP_PAIR_STR_STR) {
for (i = 0; i < s->nch; i++) {
s->map[i].out_channel_idx = av_get_channel_layout_channel_index(
@ -291,11 +288,14 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
static int channelmap_query_formats(AVFilterContext *ctx)
{
ChannelMapContext *s = ctx->priv;
AVFilterChannelLayouts *channel_layouts = NULL;
ff_add_channel_layout(&channel_layouts, s->output_layout);
ff_set_common_formats(ctx, ff_planar_sample_fmts());
ff_set_common_samplerates(ctx, ff_all_samplerates());
ff_channel_layouts_ref(ff_all_channel_layouts(), &ctx->inputs[0]->out_channel_layouts);
ff_channel_layouts_ref(s->channel_layouts, &ctx->outputs[0]->in_channel_layouts);
ff_channel_layouts_ref(channel_layouts, &ctx->outputs[0]->in_channel_layouts);
return 0;
}