Hi Luiz,
> This adds sbc_init_a2dp that can be used to convert A2DP configuration to
> the internal representation since they are not binary compatible.
> ---
> sbc/sbc.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> sbc/sbc.h | 2 +
> 2 files changed, 146 insertions(+)
>
> diff --git a/sbc/sbc.c b/sbc/sbc.c
> index c589217..12e8238 100644
> --- a/sbc/sbc.c
> +++ b/sbc/sbc.c
> @@ -57,6 +57,55 @@
> #define MSBC_SYNCWORD 0xAD
> #define MSBC_BLOCKS 15
>
> +#define A2DP_SAMPLING_FREQ_16000 (1 << 3)
> +#define A2DP_SAMPLING_FREQ_32000 (1 << 2)
> +#define A2DP_SAMPLING_FREQ_44100 (1 << 1)
> +#define A2DP_SAMPLING_FREQ_48000 (1 << 0)
> +
> +#define A2DP_CHANNEL_MODE_MONO (1 << 3)
> +#define A2DP_CHANNEL_MODE_DUAL_CHANNEL (1 << 2)
> +#define A2DP_CHANNEL_MODE_STEREO (1 << 1)
> +#define A2DP_CHANNEL_MODE_JOINT_STEREO (1 << 0)
> +
> +#define A2DP_BLOCK_LENGTH_4 (1 << 3)
> +#define A2DP_BLOCK_LENGTH_8 (1 << 2)
> +#define A2DP_BLOCK_LENGTH_12 (1 << 1)
> +#define A2DP_BLOCK_LENGTH_16 (1 << 0)
> +
> +#define A2DP_SUBBANDS_4 (1 << 1)
> +#define A2DP_SUBBANDS_8 (1 << 0)
> +
> +#define A2DP_ALLOCATION_SNR (1 << 1)
> +#define A2DP_ALLOCATION_LOUDNESS (1 << 0)
> +
> +#if __BYTE_ORDER == __LITTLE_ENDIAN
> +
> +struct a2dp_sbc {
> + uint8_t channel_mode:4;
> + uint8_t frequency:4;
> + uint8_t allocation_method:2;
> + uint8_t subbands:2;
> + uint8_t block_length:4;
> + uint8_t min_bitpool;
> + uint8_t max_bitpool;
> +} __attribute__ ((packed));
> +
> +#elif __BYTE_ORDER == __BIG_ENDIAN
> +
> +struct a2dp_sbc {
> + uint8_t frequency:4;
> + uint8_t channel_mode:4;
> + uint8_t block_length:4;
> + uint8_t subbands:2;
> + uint8_t allocation_method:2;
> + uint8_t min_bitpool;
> + uint8_t max_bitpool;
> +} __attribute__ ((packed));
> +
> +#else
> +#error "Unknown byte order"
> +#endif
> +
> /* This structure contains an unpacked SBC frame.
> Yes, there is probably quite some unused space herein */
> struct sbc_frame {
> @@ -1046,6 +1095,101 @@ SBC_EXPORT int sbc_init_msbc(sbc_t *sbc, unsigned long flags)
> return 0;
> }
>
> +SBC_EXPORT int sbc_init_a2dp(sbc_t *sbc, unsigned long flags, const void *conf,
> + size_t conf_len)
just to make it easier on the eyes:
..a2dp(sbc_t *sbc, unsigned long flags,
const void *conf, size_t conf_len)
> +{
> + const struct a2dp_sbc *a2dp;
> + int err;
> +
> + if (conf_len != sizeof(*a2dp))
> + return -EINVAL;
> +
> + err = sbc_init(sbc, flags);
> + if (err < 0)
> + return err;
> +
> + a2dp = conf;
> +
> + switch (a2dp->frequency) {
> + case A2DP_SAMPLING_FREQ_16000:
> + sbc->frequency = SBC_FREQ_16000;
> + break;
> + case A2DP_SAMPLING_FREQ_32000:
> + sbc->frequency = SBC_FREQ_32000;
> + break;
> + case A2DP_SAMPLING_FREQ_44100:
> + sbc->frequency = SBC_FREQ_44100;
> + break;
> + case A2DP_SAMPLING_FREQ_48000:
> + sbc->frequency = SBC_FREQ_48000;
> + break;
> + default:
> + goto failed;
> + }
> +
> + switch (a2dp->channel_mode) {
> + case A2DP_CHANNEL_MODE_MONO:
> + sbc->mode = SBC_MODE_MONO;
> + break;
> + case A2DP_CHANNEL_MODE_DUAL_CHANNEL:
> + sbc->mode = SBC_MODE_DUAL_CHANNEL;
> + break;
> + case A2DP_CHANNEL_MODE_STEREO:
> + sbc->mode = SBC_MODE_STEREO;
> + break;
> + case A2DP_CHANNEL_MODE_JOINT_STEREO:
> + sbc->mode = SBC_MODE_JOINT_STEREO;
> + break;
> + default:
> + goto failed;
> + }
> +
> + switch (a2dp->allocation_method) {
> + case A2DP_ALLOCATION_SNR:
> + sbc->allocation = SBC_AM_SNR;
> + break;
> + case A2DP_ALLOCATION_LOUDNESS:
> + sbc->allocation = SBC_AM_LOUDNESS;
> + break;
> + default:
> + goto failed;
> + }
> +
> + switch (a2dp->subbands) {
> + case A2DP_SUBBANDS_4:
> + sbc->subbands = SBC_SB_4;
> + break;
> + case A2DP_SUBBANDS_8:
> + sbc->subbands = SBC_SB_8;
> + break;
> + default:
> + goto failed;
> + }
> +
> + switch (a2dp->block_length) {
> + case A2DP_BLOCK_LENGTH_4:
> + sbc->blocks = SBC_BLK_4;
> + break;
> + case A2DP_BLOCK_LENGTH_8:
> + sbc->blocks = SBC_BLK_8;
> + break;
> + case A2DP_BLOCK_LENGTH_12:
> + sbc->blocks = SBC_BLK_12;
> + break;
> + case A2DP_BLOCK_LENGTH_16:
> + sbc->blocks = SBC_BLK_16;
> + break;
> + default:
> + goto failed;
> + }
> +
> + return 0;
> +
> +failed:
> + sbc_finish(sbc);
> + return -EINVAL;
> +}
> +
> SBC_EXPORT ssize_t sbc_parse(sbc_t *sbc, const void *input, size_t input_len)
> {
> return sbc_decode(sbc, input, input_len, NULL, 0, NULL);
> diff --git a/sbc/sbc.h b/sbc/sbc.h
> index 5f8a1fc..02ad9fe 100644
> --- a/sbc/sbc.h
> +++ b/sbc/sbc.h
> @@ -84,6 +84,8 @@ typedef struct sbc_struct sbc_t;
> int sbc_init(sbc_t *sbc, unsigned long flags);
> int sbc_reinit(sbc_t *sbc, unsigned long flags);
> int sbc_init_msbc(sbc_t *sbc, unsigned long flags);
> +int sbc_init_a2dp(sbc_t *sbc, unsigned long flags, const void *conf,
> + size_t conf_len);
Same here:
int sbc_init_a2dp(sbc_t *sbc, unsigned long flags,
const void *conf, size_t conf_len);
>
> ssize_t sbc_parse(sbc_t *sbc, const void *input, size_t input_len);
Regards
Marcel
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