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lavfi/af_channelmap: remove an arbitrary limit on channel count

This commit is contained in:
Anton Khirnov 2024-09-02 17:38:53 +02:00
parent a3f79fd22a
commit 7dc81d33c2
1 changed files with 54 additions and 33 deletions
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87
libavfilter/af_channelmap.c
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@ -55,14 +55,15 @@ enum MappingMode {
MAP_PAIR_STR_STR
};
#define MAX_CH 64
typedef struct ChannelMapContext {
const AVClass *class;
char *mapping_str;
AVChannelLayout output_layout;
struct ChannelMap map[MAX_CH];
struct ChannelMap *map;
int nch;
enum MappingMode mode;
uint8_t **source_planes;
} ChannelMapContext;
#define OFFSET(x) offsetof(ChannelMapContext, x)
@ -78,6 +79,13 @@ static const AVOption channelmap_options[] = {
AVFILTER_DEFINE_CLASS(channelmap);
static void channelmap_uninit(AVFilterContext *ctx)
{
ChannelMapContext *s = ctx->priv;
av_freep(&s->map);
av_freep(&s->source_planes);
}
static char* split(char *message, char delim) {
char *next = strchr(message, delim);
if (next)
@ -85,7 +93,7 @@ static char* split(char *message, char delim) {
return next;
}
static int get_channel_idx(char **map, int *ch, char delim, int max_nb_channels)
static int get_channel_idx(char **map, int *ch, char delim)
{
char *next;
int len;
@ -99,7 +107,7 @@ static int get_channel_idx(char **map, int *ch, char delim, int max_nb_channels)
sscanf(*map, "%d%n", ch, &n);
if (n != len)
return AVERROR(EINVAL);
if (*ch < 0 || *ch >= max_nb_channels)
if (*ch < 0)
return AVERROR(EINVAL);
*map = next;
return 0;
@ -148,7 +156,8 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
int map_entries = 0;
enum MappingMode mode;
int64_t out_ch_mask = 0;
uint64_t presence_mask;
uint8_t *presence_map = NULL;
int ret = 0;
int i;
mapping = s->mapping_str;
@ -182,27 +191,25 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
if (*++sep) // Allow trailing comma
map_entries++;
}
}
if (map_entries > MAX_CH) {
av_log(ctx, AV_LOG_ERROR, "Too many channels mapped: '%d'.\n", map_entries);
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;
s->map = av_malloc_array(map_entries, sizeof(*s->map));
if (!s->map)
return AVERROR(ENOMEM);
}
for (i = 0; i < map_entries; i++) {
int in_ch_idx = -1, out_ch_idx = -1;
int in_ch = -1, out_ch = -1;
static const char err[] = "Failed to parse channel map\n";
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;
switch (mode) {
case MAP_ONE_INT:
if (get_channel_idx(&mapping, &in_ch_idx, separator, MAX_CH) < 0) {
if (get_channel_idx(&mapping, &in_ch_idx, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
@ -218,8 +225,8 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
s->map[i].out_channel_idx = i;
break;
case MAP_PAIR_INT_INT:
if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
if (get_channel_idx(&mapping, &in_ch_idx, '-') < 0 ||
get_channel_idx(&mapping, &out_ch_idx, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
@ -227,7 +234,7 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
s->map[i].out_channel_idx = out_ch_idx;
break;
case MAP_PAIR_INT_STR:
if (get_channel_idx(&mapping, &in_ch_idx, '-', MAX_CH) < 0 ||
if (get_channel_idx(&mapping, &in_ch_idx, '-') < 0 ||
get_channel(&mapping, &out_ch, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
@ -241,7 +248,7 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
break;
case MAP_PAIR_STR_INT:
if (get_channel(&mapping, &in_ch, '-') < 0 ||
get_channel_idx(&mapping, &out_ch_idx, separator, MAX_CH) < 0) {
get_channel_idx(&mapping, &out_ch_idx, separator) < 0) {
av_log(ctx, AV_LOG_ERROR, err);
return AVERROR(EINVAL);
}
@ -275,6 +282,11 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
if (mode == MAP_NONE) {
int i;
s->nch = s->output_layout.nb_channels;
s->map = av_malloc_array(s->nch, sizeof(*s->map));
if (!s->map)
return AVERROR(ENOMEM);
for (i = 0; i < s->nch; i++) {
s->map[i].in_channel_idx = i;
s->map[i].out_channel_idx = i;
@ -301,22 +313,25 @@ static av_cold int channelmap_init(AVFilterContext *ctx)
}
}
presence_mask = 0;
presence_map = av_calloc(s->nch, sizeof(*presence_map));
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");
const int out_idx = s->map[i].out_channel_idx;
int ret = check_idx_and_id(ctx, out_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) {
break;
if (presence_map[out_idx]) {
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);
ret = AVERROR(EINVAL);
break;
}
presence_mask |= idx_mask;
presence_map[out_idx] = 1;
}
av_freep(&presence_map);
if (ret < 0)
return ret;
return 0;
}
@ -353,10 +368,9 @@ static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf)
const int nch_in = inlink->ch_layout.nb_channels;
const int nch_out = s->nch;
int ch, ret;
uint8_t *source_planes[MAX_CH];
memcpy(source_planes, buf->extended_data,
nch_in * sizeof(source_planes[0]));
memcpy(s->source_planes, buf->extended_data,
nch_in * sizeof(s->source_planes[0]));
if (nch_out > nch_in) {
if (nch_out > FF_ARRAY_ELEMS(buf->data)) {
@ -380,7 +394,7 @@ static int channelmap_filter_frame(AVFilterLink *inlink, AVFrame *buf)
for (ch = 0; ch < nch_out; ch++) {
buf->extended_data[s->map[ch].out_channel_idx] =
source_planes[s->map[ch].in_channel_idx];
s->source_planes[s->map[ch].in_channel_idx];
}
if (buf->data != buf->extended_data)
@ -411,6 +425,12 @@ static int channelmap_config_input(AVFilterLink *inlink)
err = AVERROR(EINVAL);
}
av_freep(&s->source_planes);
s->source_planes = av_calloc(inlink->ch_layout.nb_channels,
sizeof(*s->source_planes));
if (!s->source_planes)
return AVERROR(ENOMEM);
return err;
}
@ -428,6 +448,7 @@ const AVFilter ff_af_channelmap = {
.name = "channelmap",
.description = NULL_IF_CONFIG_SMALL("Remap audio channels."),
.init = channelmap_init,
.uninit = channelmap_uninit,
.priv_size = sizeof(ChannelMapContext),
.priv_class = &channelmap_class,
FILTER_INPUTS(avfilter_af_channelmap_inputs),