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alsa: add enumeration of iec958 format

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For hdmi and iec958 devices, enumerate the iec958 formats and
codecs. Initially only PCM is supported as a codec but with
a property or an init option, the list of codecs can be dynamically
configured.
This commit is contained in:
Wim Taymans 2021-08-12 14:08:20 +02:00
parent 8147772cf5
commit 9dfe35b17c
4 changed files with 267 additions and 71 deletions
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42
spa/plugins/alsa/alsa-pcm.h
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@ -185,6 +185,10 @@ struct state {
unsigned int planar:1;
unsigned int freewheel:1;
unsigned int open_ucm:1;
unsigned int is_iec958:1;
unsigned int is_hdmi:1;
uint64_t iec958_codecs;
int64_t sample_count;
@ -262,6 +266,44 @@ static inline void spa_alsa_parse_position(struct channel_map *map, const char *
}
}
static inline uint32_t spa_alsa_iec958_codec_from_name(const char *name)
{
int i;
for (i = 0; spa_type_audio_iec958_codec[i].name; i++) {
if (strcmp(name, spa_debug_type_short_name(spa_type_audio_iec958_codec[i].name)) == 0)
return spa_type_audio_iec958_codec[i].type;
}
return SPA_AUDIO_IEC958_CODEC_UNKNOWN;
}
static inline void spa_alsa_parse_iec958_codecs(uint64_t *codecs, const char *val, size_t len)
{
struct spa_json it[2];
char v[256];
spa_json_init(&it[0], val, len);
if (spa_json_enter_array(&it[0], &it[1]) <= 0)
spa_json_init(&it[1], val, len);
*codecs = 0;
while (spa_json_get_string(&it[1], v, sizeof(v)) > 0)
*codecs |= 1ULL << spa_alsa_iec958_codec_from_name(v);
}
static inline uint32_t spa_alsa_get_iec958_codecs(struct state *state, uint32_t *codecs,
uint32_t max_codecs)
{
uint64_t mask = state->iec958_codecs;
uint32_t i = 0, j = 0;
while (mask && i < max_codecs) {
if (mask & 1)
codecs[i++] = j;
mask >>= 1;
j++;
}
return i;
}
#ifdef __cplusplus
} /* extern "C" */
#endif