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avfilter/af_channelmap: add some additional checks for the mappings

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- Properly initialize all the mappings to -1 by default.
- Make sure every output channel is assigned exactly once
- Autodetect a native layout when only native channels are present
- Always honor the user specified layout, but make sure the mapping is
  compatible with it

The last item is a regression from 4af412be71.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2024-03-18 23:51:50 +01:00
parent bba6dd391f
commit eaca78eff8
1 changed files with 42 additions and 11 deletions
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53
libavfilter/af_channelmap.c
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@ -146,7 +146,8 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
char *mapping, separator = '|';
int map_entries = 0;
enum MappingMode mode;
uint64_t out_ch_mask = 0;
int64_t out_ch_mask = 0;
uint64_t presence_mask;
int i;
mapping = s->mapping_str;
@ -187,6 +188,13 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
return AVERROR(EINVAL);
}
for (i = 0; i < MAX_CH; i++) {
s->map[i].in_channel_idx = -1;
s->map[i].out_channel_idx = -1;
s->map[i].in_channel = -1;
s->map[i].out_channel = -1;
}
for (i = 0; i < map_entries; i++) {
int in_ch_idx = -1, out_ch_idx = -1;
int in_ch = -1, out_ch = -1;
@ -219,14 +227,16 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
break;
case MAP_PAIR_INT_STR:
if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
get_channel(&mapping, &out_ch, separator) < 0 ||
(1ULL << out_ch) & out_ch_mask) {
get_channel(&mapping, &out_ch, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel_idx = in_ch_idx;
s->map[i].out_channel = out_ch;
out_ch_mask |= 1ULL << out_ch;
if (out_ch < 63)
out_ch_mask |= 1ULL << out_ch;
else
out_ch_mask = -1;
break;
case MAP_PAIR_STR_INT:
if (get_channel(&mapping, &in_ch, '-') < 0 ||
@ -239,23 +249,27 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
break;
case MAP_PAIR_STR_STR:
if (get_channel(&mapping, &in_ch, '-') < 0 ||
get_channel(&mapping, &out_ch, separator) < 0 ||
(1ULL << out_ch) & out_ch_mask) {
get_channel(&mapping, &out_ch, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
s->map[i].in_channel = in_ch;
s->map[i].out_channel = out_ch;
out_ch_mask |= 1ULL << out_ch;
if (out_ch < 63)
out_ch_mask |= 1ULL << out_ch;
else
out_ch_mask = -1;
break;
}
}
s->mode = mode;
s->nch = map_entries;
if (out_ch_mask)
av_channel_layout_from_mask(&s->output_layout, out_ch_mask);
else if (map_entries && s->output_layout.nb_channels == 0)
av_channel_layout_default(&s->output_layout, map_entries);
if (s->output_layout.nb_channels == 0) {
if (out_ch_mask > 0)
av_channel_layout_from_mask(&s->output_layout, out_ch_mask);
else if (map_entries)
av_channel_layout_default(&s->output_layout, map_entries);
}
if (mode == MAP_NONE) {
int i;
@ -286,6 +300,23 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
}
}
presence_mask = 0;
for (i = 0; i < s->nch; i++) {
uint64_t idx_mask;
int ret = check_idx_and_id(ctx, s->map[i].out_channel_idx, s->map[i].out_channel, &s->output_layout, "out");
if (ret < 0)
return ret;
idx_mask = (1ULL << s->map[i].out_channel_idx);
if (presence_mask & idx_mask) {
char layout_name[256];
av_channel_layout_describe(&s->output_layout, layout_name, sizeof(layout_name));
av_log(ctx, AV_LOG_ERROR, "Mapping %d assigns channel #%d twice in output layout '%s'.\n",
i + 1, s->map[i].out_channel_idx, layout_name);
return AVERROR(EINVAL);
}
presence_mask |= idx_mask;
}
return 0;
}