#include "sbc_tables.h"
#include "sbc.h"
+#include "sbc_primitives.h"
#define SBC_SYNCWORD 0x9C
uint8_t joint;
/* only the lower 4 bits of every element are to be used */
- uint8_t scale_factor[2][8];
+ uint32_t scale_factor[2][8];
/* raw integer subband samples in the frame */
+ int32_t SBC_ALIGNED sb_sample_f[16][2][8];
- int32_t sb_sample_f[16][2][8];
- int32_t sb_sample[16][2][8]; /* modified subband samples */
- int16_t pcm_sample[2][16*8]; /* original pcm audio samples */
+ /* modified subband samples */
+ int32_t SBC_ALIGNED sb_sample[16][2][8];
+
+ /* original pcm audio samples */
+ int16_t SBC_ALIGNED pcm_sample[2][16*8];
};
struct sbc_decoder_state {
int offset[2][16];
};
-struct sbc_encoder_state {
- int subbands;
- int position[2];
- int16_t X[2][256];
- void (*sbc_analyze_4b_4s)(int16_t *pcm, int16_t *x,
- int32_t *out, int out_stride);
- void (*sbc_analyze_4b_8s)(int16_t *pcm, int16_t *x,
- int32_t *out, int out_stride);
-};
-
/*
* Calculates the CRC-8 of the first len bits in data
*/
static int sbc_unpack_frame(const uint8_t *data, struct sbc_frame *frame,
size_t len)
{
- int consumed;
+ unsigned int consumed;
/* Will copy the parts of the header that are relevant to crc
* calculation here */
uint8_t crc_header[11] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
}
}
-static inline void _sbc_analyze_four(const int16_t *in, int32_t *out)
-{
- FIXED_A t1[4];
- FIXED_T t2[4];
- int i = 0, hop = 0;
-
- /* rounding coefficient */
- t1[0] = t1[1] = t1[2] = t1[3] =
- (FIXED_A) 1 << (SBC_PROTO_FIXED4_SCALE - 1);
-
- /* low pass polyphase filter */
- for (hop = 0; hop < 40; hop += 8) {
- t1[0] += (FIXED_A) in[hop] * _sbc_proto_fixed4[hop];
- t1[1] += (FIXED_A) in[hop + 1] * _sbc_proto_fixed4[hop + 1];
- t1[2] += (FIXED_A) in[hop + 2] * _sbc_proto_fixed4[hop + 2];
- t1[1] += (FIXED_A) in[hop + 3] * _sbc_proto_fixed4[hop + 3];
- t1[0] += (FIXED_A) in[hop + 4] * _sbc_proto_fixed4[hop + 4];
- t1[3] += (FIXED_A) in[hop + 5] * _sbc_proto_fixed4[hop + 5];
- t1[3] += (FIXED_A) in[hop + 7] * _sbc_proto_fixed4[hop + 7];
- }
-
- /* scaling */
- t2[0] = t1[0] >> SBC_PROTO_FIXED4_SCALE;
- t2[1] = t1[1] >> SBC_PROTO_FIXED4_SCALE;
- t2[2] = t1[2] >> SBC_PROTO_FIXED4_SCALE;
- t2[3] = t1[3] >> SBC_PROTO_FIXED4_SCALE;
-
- /* do the cos transform */
- for (i = 0, hop = 0; i < 4; hop += 8, i++) {
- out[i] = ((FIXED_A) t2[0] * cos_table_fixed_4[0 + hop] +
- (FIXED_A) t2[1] * cos_table_fixed_4[1 + hop] +
- (FIXED_A) t2[2] * cos_table_fixed_4[2 + hop] +
- (FIXED_A) t2[3] * cos_table_fixed_4[5 + hop]) >>
- (SBC_COS_TABLE_FIXED4_SCALE - SCALE_OUT_BITS);
- }
-}
-
-static void sbc_analyze_4b_4s(int16_t *pcm, int16_t *x,
- int32_t *out, int out_stride)
-{
- int i;
-
- /* Input 4 x 4 Audio Samples */
- for (i = 0; i < 16; i += 4) {
- x[64 + i] = x[0 + i] = pcm[15 - i];
- x[65 + i] = x[1 + i] = pcm[14 - i];
- x[66 + i] = x[2 + i] = pcm[13 - i];
- x[67 + i] = x[3 + i] = pcm[12 - i];
- }
-
- /* Analyze four blocks */
- _sbc_analyze_four(x + 12, out);
- out += out_stride;
- _sbc_analyze_four(x + 8, out);
- out += out_stride;
- _sbc_analyze_four(x + 4, out);
- out += out_stride;
- _sbc_analyze_four(x, out);
-}
-
-static inline void _sbc_analyze_eight(const int16_t *in, int32_t *out)
-{
- FIXED_A t1[8];
- FIXED_T t2[8];
- int i, hop;
-
- /* rounding coefficient */
- t1[0] = t1[1] = t1[2] = t1[3] = t1[4] = t1[5] = t1[6] = t1[7] =
- (FIXED_A) 1 << (SBC_PROTO_FIXED8_SCALE-1);
-
- /* low pass polyphase filter */
- for (hop = 0; hop < 80; hop += 16) {
- t1[0] += (FIXED_A) in[hop] * _sbc_proto_fixed8[hop];
- t1[1] += (FIXED_A) in[hop + 1] * _sbc_proto_fixed8[hop + 1];
- t1[2] += (FIXED_A) in[hop + 2] * _sbc_proto_fixed8[hop + 2];
- t1[3] += (FIXED_A) in[hop + 3] * _sbc_proto_fixed8[hop + 3];
- t1[4] += (FIXED_A) in[hop + 4] * _sbc_proto_fixed8[hop + 4];
- t1[3] += (FIXED_A) in[hop + 5] * _sbc_proto_fixed8[hop + 5];
- t1[2] += (FIXED_A) in[hop + 6] * _sbc_proto_fixed8[hop + 6];
- t1[1] += (FIXED_A) in[hop + 7] * _sbc_proto_fixed8[hop + 7];
- t1[0] += (FIXED_A) in[hop + 8] * _sbc_proto_fixed8[hop + 8];
- t1[5] += (FIXED_A) in[hop + 9] * _sbc_proto_fixed8[hop + 9];
- t1[6] += (FIXED_A) in[hop + 10] * _sbc_proto_fixed8[hop + 10];
- t1[7] += (FIXED_A) in[hop + 11] * _sbc_proto_fixed8[hop + 11];
- t1[7] += (FIXED_A) in[hop + 13] * _sbc_proto_fixed8[hop + 13];
- t1[6] += (FIXED_A) in[hop + 14] * _sbc_proto_fixed8[hop + 14];
- t1[5] += (FIXED_A) in[hop + 15] * _sbc_proto_fixed8[hop + 15];
- }
-
- /* scaling */
- t2[0] = t1[0] >> SBC_PROTO_FIXED8_SCALE;
- t2[1] = t1[1] >> SBC_PROTO_FIXED8_SCALE;
- t2[2] = t1[2] >> SBC_PROTO_FIXED8_SCALE;
- t2[3] = t1[3] >> SBC_PROTO_FIXED8_SCALE;
- t2[4] = t1[4] >> SBC_PROTO_FIXED8_SCALE;
- t2[5] = t1[5] >> SBC_PROTO_FIXED8_SCALE;
- t2[6] = t1[6] >> SBC_PROTO_FIXED8_SCALE;
- t2[7] = t1[7] >> SBC_PROTO_FIXED8_SCALE;
-
- /* do the cos transform */
- for (i = 0, hop = 0; i < 8; hop += 16, i++) {
- out[i] = ((FIXED_A) t2[0] * cos_table_fixed_8[0 + hop] +
- (FIXED_A) t2[1] * cos_table_fixed_8[1 + hop] +
- (FIXED_A) t2[2] * cos_table_fixed_8[2 + hop] +
- (FIXED_A) t2[3] * cos_table_fixed_8[3 + hop] +
- (FIXED_A) t2[4] * cos_table_fixed_8[4 + hop] +
- (FIXED_A) t2[5] * cos_table_fixed_8[9 + hop] +
- (FIXED_A) t2[6] * cos_table_fixed_8[10 + hop] +
- (FIXED_A) t2[7] * cos_table_fixed_8[11 + hop]) >>
- (SBC_COS_TABLE_FIXED8_SCALE - SCALE_OUT_BITS);
- }
-}
-
-static void sbc_analyze_4b_8s(int16_t *pcm, int16_t *x,
- int32_t *out, int out_stride)
-{
- int i;
-
- /* Input 4 x 8 Audio Samples */
- for (i = 0; i < 32; i += 8) {
- x[128 + i] = x[0 + i] = pcm[31 - i];
- x[129 + i] = x[1 + i] = pcm[30 - i];
- x[130 + i] = x[2 + i] = pcm[29 - i];
- x[131 + i] = x[3 + i] = pcm[28 - i];
- x[132 + i] = x[4 + i] = pcm[27 - i];
- x[133 + i] = x[5 + i] = pcm[26 - i];
- x[134 + i] = x[6 + i] = pcm[25 - i];
- x[135 + i] = x[7 + i] = pcm[24 - i];
- }
-
- /* Analyze four blocks */
- _sbc_analyze_eight(x + 24, out);
- out += out_stride;
- _sbc_analyze_eight(x + 16, out);
- out += out_stride;
- _sbc_analyze_eight(x + 8, out);
- out += out_stride;
- _sbc_analyze_eight(x, out);
-}
-
static int sbc_analyze_audio(struct sbc_encoder_state *state,
struct sbc_frame *frame)
{
int ch, blk;
+ int16_t *x;
switch (frame->subbands) {
case 4:
- for (ch = 0; ch < frame->channels; ch++)
+ for (ch = 0; ch < frame->channels; ch++) {
+ x = &state->X[ch][state->position - 16 +
+ frame->blocks * 4];
for (blk = 0; blk < frame->blocks; blk += 4) {
state->sbc_analyze_4b_4s(
- &frame->pcm_sample[ch][blk * 4],
- &state->X[ch][state->position[ch]],
+ x,
frame->sb_sample_f[blk][ch],
frame->sb_sample_f[blk + 1][ch] -
frame->sb_sample_f[blk][ch]);
- state->position[ch] -= 16;
- if (state->position[ch] < 0)
- state->position[ch] = 64 - 16;
+ x -= 16;
}
+ }
return frame->blocks * 4;
case 8:
- for (ch = 0; ch < frame->channels; ch++)
+ for (ch = 0; ch < frame->channels; ch++) {
+ x = &state->X[ch][state->position - 32 +
+ frame->blocks * 8];
for (blk = 0; blk < frame->blocks; blk += 4) {
state->sbc_analyze_4b_8s(
- &frame->pcm_sample[ch][blk * 8],
- &state->X[ch][state->position[ch]],
+ x,
frame->sb_sample_f[blk][ch],
frame->sb_sample_f[blk + 1][ch] -
frame->sb_sample_f[blk][ch]);
- state->position[ch] -= 32;
- if (state->position[ch] < 0)
- state->position[ch] = 128 - 32;
+ x -= 32;
}
+ }
return frame->blocks * 8;
default:
/* Supplementary bitstream writing macros for 'sbc_pack_frame' */
-#define PUT_BITS(v, n)\
- bits_cache = (v) | (bits_cache << (n));\
- bits_count += (n);\
- if (bits_count >= 16) {\
- bits_count -= 8;\
- *data_ptr++ = (uint8_t) (bits_cache >> bits_count);\
- bits_count -= 8;\
- *data_ptr++ = (uint8_t) (bits_cache >> bits_count);\
- }\
-
-#define FLUSH_BITS()\
- while (bits_count >= 8) {\
- bits_count -= 8;\
- *data_ptr++ = (uint8_t) (bits_cache >> bits_count);\
- }\
- if (bits_count > 0)\
- *data_ptr++ = (uint8_t) (bits_cache << (8 - bits_count));\
+#define PUT_BITS(data_ptr, bits_cache, bits_count, v, n) \
+ do { \
+ bits_cache = (v) | (bits_cache << (n)); \
+ bits_count += (n); \
+ if (bits_count >= 16) { \
+ bits_count -= 8; \
+ *data_ptr++ = (uint8_t) \
+ (bits_cache >> bits_count); \
+ bits_count -= 8; \
+ *data_ptr++ = (uint8_t) \
+ (bits_cache >> bits_count); \
+ } \
+ } while (0)
+
+#define FLUSH_BITS(data_ptr, bits_cache, bits_count) \
+ do { \
+ while (bits_count >= 8) { \
+ bits_count -= 8; \
+ *data_ptr++ = (uint8_t) \
+ (bits_cache >> bits_count); \
+ } \
+ if (bits_count > 0) \
+ *data_ptr++ = (uint8_t) \
+ (bits_cache << (8 - bits_count)); \
+ } while (0)
/*
* Packs the SBC frame from frame into the memory at data. At most len
* -99 not implemented
*/
-static int sbc_pack_frame(uint8_t *data, struct sbc_frame *frame, size_t len)
+static SBC_ALWAYS_INLINE int sbc_pack_frame_internal(
+ uint8_t *data, struct sbc_frame *frame, size_t len,
+ int frame_subbands, int frame_channels)
{
/* Bitstream writer starts from the fourth byte */
uint8_t *data_ptr = data + 4;
uint32_t levels[2][8]; /* levels are derived from that */
uint32_t sb_sample_delta[2][8];
- u_int32_t scalefactor[2][8]; /* derived from frame->scale_factor */
-
data[0] = SBC_SYNCWORD;
data[1] = (frame->frequency & 0x03) << 6;
data[1] |= (frame->allocation & 0x01) << 1;
- switch (frame->subbands) {
+ switch (frame_subbands) {
case 4:
/* Nothing to do */
break;
data[2] = frame->bitpool;
if ((frame->mode == MONO || frame->mode == DUAL_CHANNEL) &&
- frame->bitpool > frame->subbands << 4)
+ frame->bitpool > frame_subbands << 4)
return -5;
if ((frame->mode == STEREO || frame->mode == JOINT_STEREO) &&
- frame->bitpool > frame->subbands << 5)
+ frame->bitpool > frame_subbands << 5)
return -5;
/* Can't fill in crc yet */
crc_header[1] = data[2];
crc_pos = 16;
- for (ch = 0; ch < frame->channels; ch++) {
- for (sb = 0; sb < frame->subbands; sb++) {
- frame->scale_factor[ch][sb] = 0;
- scalefactor[ch][sb] = 2 << SCALE_OUT_BITS;
- for (blk = 0; blk < frame->blocks; blk++) {
- while (scalefactor[ch][sb] < fabs(frame->sb_sample_f[blk][ch][sb])) {
- frame->scale_factor[ch][sb]++;
- scalefactor[ch][sb] *= 2;
- }
- }
- }
- }
-
if (frame->mode == JOINT_STEREO) {
/* like frame->sb_sample but joint stereo */
int32_t sb_sample_j[16][2];
/* scalefactor and scale_factor in joint case */
- u_int32_t scalefactor_j[2];
+ uint32_t scalefactor_j[2];
uint8_t scale_factor_j[2];
uint8_t joint = 0;
frame->joint = 0;
- for (sb = 0; sb < frame->subbands - 1; sb++) {
+ for (sb = 0; sb < frame_subbands - 1; sb++) {
scale_factor_j[0] = 0;
scalefactor_j[0] = 2 << SCALE_OUT_BITS;
scale_factor_j[1] = 0;
scalefactor_j[1] = 2 << SCALE_OUT_BITS;
for (blk = 0; blk < frame->blocks; blk++) {
+ uint32_t tmp;
/* Calculate joint stereo signal */
sb_sample_j[blk][0] =
ASR(frame->sb_sample_f[blk][0][sb], 1) +
ASR(frame->sb_sample_f[blk][1][sb], 1);
/* calculate scale_factor_j and scalefactor_j for joint case */
- while (scalefactor_j[0] < fabs(sb_sample_j[blk][0])) {
+ tmp = fabs(sb_sample_j[blk][0]);
+ while (scalefactor_j[0] < tmp) {
scale_factor_j[0]++;
scalefactor_j[0] *= 2;
}
- while (scalefactor_j[1] < fabs(sb_sample_j[blk][1])) {
+ tmp = fabs(sb_sample_j[blk][1]);
+ while (scalefactor_j[1] < tmp) {
scale_factor_j[1]++;
scalefactor_j[1] *= 2;
}
(scale_factor_j[0] +
scale_factor_j[1])) {
/* use joint stereo for this subband */
- joint |= 1 << (frame->subbands - 1 - sb);
+ joint |= 1 << (frame_subbands - 1 - sb);
frame->joint |= 1 << sb;
frame->scale_factor[0][sb] = scale_factor_j[0];
frame->scale_factor[1][sb] = scale_factor_j[1];
}
}
- PUT_BITS(joint, frame->subbands);
+ PUT_BITS(data_ptr, bits_cache, bits_count,
+ joint, frame_subbands);
crc_header[crc_pos >> 3] = joint;
- crc_pos += frame->subbands;
+ crc_pos += frame_subbands;
}
- for (ch = 0; ch < frame->channels; ch++) {
- for (sb = 0; sb < frame->subbands; sb++) {
- PUT_BITS(frame->scale_factor[ch][sb] & 0x0F, 4);
+ for (ch = 0; ch < frame_channels; ch++) {
+ for (sb = 0; sb < frame_subbands; sb++) {
+ PUT_BITS(data_ptr, bits_cache, bits_count,
+ frame->scale_factor[ch][sb] & 0x0F, 4);
crc_header[crc_pos >> 3] <<= 4;
crc_header[crc_pos >> 3] |= frame->scale_factor[ch][sb] & 0x0F;
crc_pos += 4;
sbc_calculate_bits(frame, bits);
- for (ch = 0; ch < frame->channels; ch++) {
- for (sb = 0; sb < frame->subbands; sb++) {
+ for (ch = 0; ch < frame_channels; ch++) {
+ for (sb = 0; sb < frame_subbands; sb++) {
levels[ch][sb] = ((1 << bits[ch][sb]) - 1) <<
(32 - (frame->scale_factor[ch][sb] +
SCALE_OUT_BITS + 2));
}
for (blk = 0; blk < frame->blocks; blk++) {
- for (ch = 0; ch < frame->channels; ch++) {
- for (sb = 0; sb < frame->subbands; sb++) {
+ for (ch = 0; ch < frame_channels; ch++) {
+ for (sb = 0; sb < frame_subbands; sb++) {
if (bits[ch][sb] == 0)
continue;
(sb_sample_delta[ch][sb] +
frame->sb_sample_f[blk][ch][sb])) >> 32;
- PUT_BITS(audio_sample, bits[ch][sb]);
+ PUT_BITS(data_ptr, bits_cache, bits_count,
+ audio_sample, bits[ch][sb]);
}
}
}
- FLUSH_BITS();
+ FLUSH_BITS(data_ptr, bits_cache, bits_count);
return data_ptr - data;
}
+static int sbc_pack_frame(uint8_t *data, struct sbc_frame *frame, size_t len)
+{
+ if (frame->subbands == 4) {
+ if (frame->channels == 1)
+ return sbc_pack_frame_internal(data, frame, len, 4, 1);
+ else
+ return sbc_pack_frame_internal(data, frame, len, 4, 2);
+ } else {
+ if (frame->channels == 1)
+ return sbc_pack_frame_internal(data, frame, len, 8, 1);
+ else
+ return sbc_pack_frame_internal(data, frame, len, 8, 2);
+ }
+}
+
static void sbc_encoder_init(struct sbc_encoder_state *state,
const struct sbc_frame *frame)
{
memset(&state->X, 0, sizeof(state->X));
- state->subbands = frame->subbands;
- state->position[0] = state->position[1] = 12 * frame->subbands;
+ state->position = SBC_X_BUFFER_SIZE - frame->subbands * 9;
- /* Default implementation for analyze function */
- state->sbc_analyze_4b_4s = sbc_analyze_4b_4s;
- state->sbc_analyze_4b_8s = sbc_analyze_4b_8s;
+ sbc_init_primitives(state);
}
struct sbc_priv {
int init;
- struct sbc_frame frame;
- struct sbc_decoder_state dec_state;
- struct sbc_encoder_state enc_state;
+ struct SBC_ALIGNED sbc_frame frame;
+ struct SBC_ALIGNED sbc_decoder_state dec_state;
+ struct SBC_ALIGNED sbc_encoder_state enc_state;
};
static void sbc_set_defaults(sbc_t *sbc, unsigned long flags)
memset(sbc, 0, sizeof(sbc_t));
- sbc->priv = malloc(sizeof(struct sbc_priv));
- if (!sbc->priv)
+ sbc->priv_alloc_base = malloc(sizeof(struct sbc_priv) + SBC_ALIGN_MASK);
+ if (!sbc->priv_alloc_base)
return -ENOMEM;
+ sbc->priv = (void *) (((uintptr_t) sbc->priv_alloc_base +
+ SBC_ALIGN_MASK) & ~((uintptr_t) SBC_ALIGN_MASK));
+
memset(sbc->priv, 0, sizeof(struct sbc_priv));
sbc_set_defaults(sbc, flags);
int output_len, int *written)
{
struct sbc_priv *priv;
- char *ptr;
- int i, ch, framelen, samples;
+ int framelen, samples;
+ int (*sbc_enc_process_input)(int position,
+ const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE],
+ int nsamples, int nchannels);
if (!sbc && !input)
return -EIO;
if (!output || output_len < priv->frame.length)
return -ENOSPC;
- ptr = input;
-
- for (i = 0; i < priv->frame.subbands * priv->frame.blocks; i++) {
- for (ch = 0; ch < priv->frame.channels; ch++) {
- int16_t s;
- if (sbc->endian == SBC_BE)
- s = (ptr[0] & 0xff) << 8 | (ptr[1] & 0xff);
- else
- s = (ptr[0] & 0xff) | (ptr[1] & 0xff) << 8;
- ptr += 2;
- priv->frame.pcm_sample[ch][i] = s;
- }
+ /* Select the needed input data processing function and call it */
+ if (priv->frame.subbands == 8) {
+ if (sbc->endian == SBC_BE)
+ sbc_enc_process_input =
+ priv->enc_state.sbc_enc_process_input_8s_be;
+ else
+ sbc_enc_process_input =
+ priv->enc_state.sbc_enc_process_input_8s_le;
+ } else {
+ if (sbc->endian == SBC_BE)
+ sbc_enc_process_input =
+ priv->enc_state.sbc_enc_process_input_4s_be;
+ else
+ sbc_enc_process_input =
+ priv->enc_state.sbc_enc_process_input_4s_le;
}
+ priv->enc_state.position = sbc_enc_process_input(
+ priv->enc_state.position, (const uint8_t *) input,
+ priv->enc_state.X, priv->frame.subbands * priv->frame.blocks,
+ priv->frame.channels);
+
samples = sbc_analyze_audio(&priv->enc_state, &priv->frame);
+ priv->enc_state.sbc_calc_scalefactors(
+ priv->frame.sb_sample_f, priv->frame.scale_factor,
+ priv->frame.blocks, priv->frame.channels, priv->frame.subbands);
+
framelen = sbc_pack_frame(output, &priv->frame, output_len);
if (written)
if (!sbc)
return;
- if (sbc->priv)
- free(sbc->priv);
+ if (sbc->priv_alloc_base)
+ free(sbc->priv_alloc_base);
memset(sbc, 0, sizeof(sbc_t));
}
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