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alsa: add audio.allowed-rates param

Browse source 
Add a construct and runtime param to limit the amount of allowed
samplerates used by the node.

Fixes #1932
This commit is contained in:
Wim Taymans 2022-01-03 16:03:23 +01:00
parent c3725d5dde
commit 67dc97fa43
4 changed files with 107 additions and 13 deletions
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20
spa/plugins/alsa/alsa-pcm.h
View file

@ -55,6 +55,8 @@ extern "C" {
#define MIN_LATENCY 16
#define MAX_LATENCY 8192
#define MAX_RATES 16
#define DEFAULT_PERIOD 1024u
#define DEFAULT_RATE 48000u
#define DEFAULT_CHANNELS 2u
@ -140,6 +142,8 @@ struct state {
uint32_t default_format;
unsigned int default_channels;
unsigned int default_rate;
uint32_t allowed_rates[MAX_RATES];
uint32_t n_allowed_rates;
struct channel_map default_pos;
unsigned int disable_mmap;
unsigned int disable_batch;
@ -285,6 +289,22 @@ static inline void spa_alsa_parse_position(struct channel_map *map, const char *
}
}
static inline uint32_t spa_alsa_parse_rates(uint32_t *rates, uint32_t max, const char *val, size_t len)
{
struct spa_json it[2];
char v[256];
uint32_t count;
spa_json_init(&it[0], val, len);
if (spa_json_enter_array(&it[0], &it[1]) <= 0)
spa_json_init(&it[1], val, len);
count = 0;
while (spa_json_get_string(&it[1], v, sizeof(v)) > 0 && count < max)
rates[count++] = atoi(v);
return count;
}
static inline uint32_t spa_alsa_iec958_codec_from_name(const char *name)
{
int i;