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Diffstat (limited to 'src/modules/bt-sbc.c')
| -rw-r--r-- | src/modules/bt-sbc.c | 1411 |
1 files changed, 1411 insertions, 0 deletions
diff --git a/src/modules/bt-sbc.c b/src/modules/bt-sbc.c new file mode 100644 index 00000000..8e7b0607 --- /dev/null +++ b/src/modules/bt-sbc.c @@ -0,0 +1,1411 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2008 Marcel Holtmann <marcel@holtmann.org> + * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> + * Copyright (C) 2005-2008 Brad Midgley <bmidgley@xmission.com> + * + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +/* todo items: + + use a log2 table for byte integer scale factors calculation (sum log2 results + for high and low bytes) fill bitpool by 16 bits instead of one at a time in + bits allocation/bitpool generation port to the dsp + +*/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <sys/types.h> + +#include "bt-sbc_math.h" +#include "bt-sbc_tables.h" + +#include "bt-sbc.h" + +#define SBC_SYNCWORD 0x9C + +/* This structure contains an unpacked SBC frame. + Yes, there is probably quite some unused space herein */ +struct sbc_frame { + uint8_t frequency; + uint8_t block_mode; + uint8_t blocks; + enum { + MONO = SBC_MODE_MONO, + DUAL_CHANNEL = SBC_MODE_DUAL_CHANNEL, + STEREO = SBC_MODE_STEREO, + JOINT_STEREO = SBC_MODE_JOINT_STEREO + } mode; + uint8_t channels; + enum { + LOUDNESS = SBC_AM_LOUDNESS, + SNR = SBC_AM_SNR + } allocation; + uint8_t subband_mode; + uint8_t subbands; + uint8_t bitpool; + uint8_t codesize; + uint8_t length; + + /* bit number x set means joint stereo has been used in subband x */ + uint8_t joint; + + /* only the lower 4 bits of every element are to be used */ + uint8_t scale_factor[2][8]; + + /* raw integer subband samples in the frame */ + + 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 */ +}; + +struct sbc_decoder_state { + int subbands; + int32_t V[2][170]; + int offset[2][16]; +}; + +struct sbc_encoder_state { + int subbands; + int position[2]; + int32_t X[2][160]; +}; + +/* + * Calculates the CRC-8 of the first len bits in data + */ +static const uint8_t crc_table[256] = { + 0x00, 0x1D, 0x3A, 0x27, 0x74, 0x69, 0x4E, 0x53, + 0xE8, 0xF5, 0xD2, 0xCF, 0x9C, 0x81, 0xA6, 0xBB, + 0xCD, 0xD0, 0xF7, 0xEA, 0xB9, 0xA4, 0x83, 0x9E, + 0x25, 0x38, 0x1F, 0x02, 0x51, 0x4C, 0x6B, 0x76, + 0x87, 0x9A, 0xBD, 0xA0, 0xF3, 0xEE, 0xC9, 0xD4, + 0x6F, 0x72, 0x55, 0x48, 0x1B, 0x06, 0x21, 0x3C, + 0x4A, 0x57, 0x70, 0x6D, 0x3E, 0x23, 0x04, 0x19, + 0xA2, 0xBF, 0x98, 0x85, 0xD6, 0xCB, 0xEC, 0xF1, + 0x13, 0x0E, 0x29, 0x34, 0x67, 0x7A, 0x5D, 0x40, + 0xFB, 0xE6, 0xC1, 0xDC, 0x8F, 0x92, 0xB5, 0xA8, + 0xDE, 0xC3, 0xE4, 0xF9, 0xAA, 0xB7, 0x90, 0x8D, + 0x36, 0x2B, 0x0C, 0x11, 0x42, 0x5F, 0x78, 0x65, + 0x94, 0x89, 0xAE, 0xB3, 0xE0, 0xFD, 0xDA, 0xC7, + 0x7C, 0x61, 0x46, 0x5B, 0x08, 0x15, 0x32, 0x2F, + 0x59, 0x44, 0x63, 0x7E, 0x2D, 0x30, 0x17, 0x0A, + 0xB1, 0xAC, 0x8B, 0x96, 0xC5, 0xD8, 0xFF, 0xE2, + 0x26, 0x3B, 0x1C, 0x01, 0x52, 0x4F, 0x68, 0x75, + 0xCE, 0xD3, 0xF4, 0xE9, 0xBA, 0xA7, 0x80, 0x9D, + 0xEB, 0xF6, 0xD1, 0xCC, 0x9F, 0x82, 0xA5, 0xB8, + 0x03, 0x1E, 0x39, 0x24, 0x77, 0x6A, 0x4D, 0x50, + 0xA1, 0xBC, 0x9B, 0x86, 0xD5, 0xC8, 0xEF, 0xF2, + 0x49, 0x54, 0x73, 0x6E, 0x3D, 0x20, 0x07, 0x1A, + 0x6C, 0x71, 0x56, 0x4B, 0x18, 0x05, 0x22, 0x3F, + 0x84, 0x99, 0xBE, 0xA3, 0xF0, 0xED, 0xCA, 0xD7, + 0x35, 0x28, 0x0F, 0x12, 0x41, 0x5C, 0x7B, 0x66, + 0xDD, 0xC0, 0xE7, 0xFA, 0xA9, 0xB4, 0x93, 0x8E, + 0xF8, 0xE5, 0xC2, 0xDF, 0x8C, 0x91, 0xB6, 0xAB, + 0x10, 0x0D, 0x2A, 0x37, 0x64, 0x79, 0x5E, 0x43, + 0xB2, 0xAF, 0x88, 0x95, 0xC6, 0xDB, 0xFC, 0xE1, + 0x5A, 0x47, 0x60, 0x7D, 0x2E, 0x33, 0x14, 0x09, + 0x7F, 0x62, 0x45, 0x58, 0x0B, 0x16, 0x31, 0x2C, + 0x97, 0x8A, 0xAD, 0xB0, 0xE3, 0xFE, 0xD9, 0xC4 +}; + +static uint8_t sbc_crc8(const uint8_t *data, size_t len) +{ + uint8_t crc = 0x0f; + size_t i; + uint8_t octet; + + for (i = 0; i < len / 8; i++) + crc = crc_table[crc ^ data[i]]; + + octet = data[i]; + for (i = 0; i < len % 8; i++) { + char bit = ((octet ^ crc) & 0x80) >> 7; + + crc = ((crc & 0x7f) << 1) ^ (bit ? 0x1d : 0); + + octet = octet << 1; + } + + return crc; +} + +/* + * Code straight from the spec to calculate the bits array + * Takes a pointer to the frame in question, a pointer to the bits array and + * the sampling frequency (as 2 bit integer) + */ +static void sbc_calculate_bits(const struct sbc_frame *frame, int (*bits)[8]) +{ + uint8_t sf = frame->frequency; + + if (frame->mode == MONO || frame->mode == DUAL_CHANNEL) { + int bitneed[2][8], loudness, max_bitneed, bitcount, slicecount, bitslice; + int ch, sb; + + for (ch = 0; ch < frame->channels; ch++) { + max_bitneed = 0; + if (frame->allocation == SNR) { + for (sb = 0; sb < frame->subbands; sb++) { + bitneed[ch][sb] = frame->scale_factor[ch][sb]; + if (bitneed[ch][sb] > max_bitneed) + max_bitneed = bitneed[ch][sb]; + } + } else { + for (sb = 0; sb < frame->subbands; sb++) { + if (frame->scale_factor[ch][sb] == 0) + bitneed[ch][sb] = -5; + else { + if (frame->subbands == 4) + loudness = frame->scale_factor[ch][sb] - sbc_offset4[sf][sb]; + else + loudness = frame->scale_factor[ch][sb] - sbc_offset8[sf][sb]; + if (loudness > 0) + bitneed[ch][sb] = loudness / 2; + else + bitneed[ch][sb] = loudness; + } + if (bitneed[ch][sb] > max_bitneed) + max_bitneed = bitneed[ch][sb]; + } + } + + bitcount = 0; + slicecount = 0; + bitslice = max_bitneed + 1; + do { + bitslice--; + bitcount += slicecount; + slicecount = 0; + for (sb = 0; sb < frame->subbands; sb++) { + if ((bitneed[ch][sb] > bitslice + 1) && (bitneed[ch][sb] < bitslice + 16)) + slicecount++; + else if (bitneed[ch][sb] == bitslice + 1) + slicecount += 2; + } + } while (bitcount + slicecount < frame->bitpool); + + if (bitcount + slicecount == frame->bitpool) { + bitcount += slicecount; + bitslice--; + } + + for (sb = 0; sb < frame->subbands; sb++) { + if (bitneed[ch][sb] < bitslice + 2) + bits[ch][sb] = 0; + else { + bits[ch][sb] = bitneed[ch][sb] - bitslice; + if (bits[ch][sb] > 16) + bits[ch][sb] = 16; + } + } + + for (sb = 0; bitcount < frame->bitpool && sb < frame->subbands; sb++) { + if ((bits[ch][sb] >= 2) && (bits[ch][sb] < 16)) { + bits[ch][sb]++; + bitcount++; + } else if ((bitneed[ch][sb] == bitslice + 1) && (frame->bitpool > bitcount + 1)) { + bits[ch][sb] = 2; + bitcount += 2; + } + } + + for (sb = 0; bitcount < frame->bitpool && sb < frame->subbands; sb++) { + if (bits[ch][sb] < 16) { + bits[ch][sb]++; + bitcount++; + } + } + + } + + } else if (frame->mode == STEREO || frame->mode == JOINT_STEREO) { + int bitneed[2][8], loudness, max_bitneed, bitcount, slicecount, bitslice; + int ch, sb; + + max_bitneed = 0; + if (frame->allocation == SNR) { + for (ch = 0; ch < 2; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + bitneed[ch][sb] = frame->scale_factor[ch][sb]; + if (bitneed[ch][sb] > max_bitneed) + max_bitneed = bitneed[ch][sb]; + } + } + } else { + for (ch = 0; ch < 2; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + if (frame->scale_factor[ch][sb] == 0) + bitneed[ch][sb] = -5; + else { + if (frame->subbands == 4) + loudness = frame->scale_factor[ch][sb] - sbc_offset4[sf][sb]; + else + loudness = frame->scale_factor[ch][sb] - sbc_offset8[sf][sb]; + if (loudness > 0) + bitneed[ch][sb] = loudness / 2; + else + bitneed[ch][sb] = loudness; + } + if (bitneed[ch][sb] > max_bitneed) + max_bitneed = bitneed[ch][sb]; + } + } + } + + bitcount = 0; + slicecount = 0; + bitslice = max_bitneed + 1; + do { + bitslice--; + bitcount += slicecount; + slicecount = 0; + for (ch = 0; ch < 2; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + if ((bitneed[ch][sb] > bitslice + 1) && (bitneed[ch][sb] < bitslice + 16)) + slicecount++; + else if (bitneed[ch][sb] == bitslice + 1) + slicecount += 2; + } + } + } while (bitcount + slicecount < frame->bitpool); + + if (bitcount + slicecount == frame->bitpool) { + bitcount += slicecount; + bitslice--; + } + + for (ch = 0; ch < 2; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + if (bitneed[ch][sb] < bitslice + 2) { + bits[ch][sb] = 0; + } else { + bits[ch][sb] = bitneed[ch][sb] - bitslice; + if (bits[ch][sb] > 16) + bits[ch][sb] = 16; + } + } + } + + ch = 0; + sb = 0; + while (bitcount < frame->bitpool) { + if ((bits[ch][sb] >= 2) && (bits[ch][sb] < 16)) { + bits[ch][sb]++; + bitcount++; + } else if ((bitneed[ch][sb] == bitslice + 1) && (frame->bitpool > bitcount + 1)) { + bits[ch][sb] = 2; + bitcount += 2; + } + if (ch == 1) { + ch = 0; + sb++; + if (sb >= frame->subbands) break; + } else + ch = 1; + } + + ch = 0; + sb = 0; + while (bitcount < frame->bitpool) { + if (bits[ch][sb] < 16) { + bits[ch][sb]++; + bitcount++; + } + if (ch == 1) { + ch = 0; + sb++; + if (sb >= frame->subbands) break; + } else + ch = 1; + } + + } + +} + +/* + * Unpacks a SBC frame at the beginning of the stream in data, + * which has at most len bytes into frame. + * Returns the length in bytes of the packed frame, or a negative + * value on error. The error codes are: + * + * -1 Data stream too short + * -2 Sync byte incorrect + * -3 CRC8 incorrect + * -4 Bitpool value out of bounds + */ +static int sbc_unpack_frame(const uint8_t *data, struct sbc_frame *frame, + size_t len) +{ + 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 }; + int crc_pos = 0; + int32_t temp; + + int audio_sample; + int ch, sb, blk, bit; /* channel, subband, block and bit standard + counters */ + int bits[2][8]; /* bits distribution */ + uint32_t levels[2][8]; /* levels derived from that */ + + if (len < 4) + return -1; + + if (data[0] != SBC_SYNCWORD) + return -2; + + frame->frequency = (data[1] >> 6) & 0x03; + + frame->block_mode = (data[1] >> 4) & 0x03; + switch (frame->block_mode) { + case SBC_BLK_4: + frame->blocks = 4; + break; + case SBC_BLK_8: + frame->blocks = 8; + break; + case SBC_BLK_12: + frame->blocks = 12; + break; + case SBC_BLK_16: + frame->blocks = 16; + break; + } + + frame->mode = (data[1] >> 2) & 0x03; + switch (frame->mode) { + case MONO: + frame->channels = 1; + break; + case DUAL_CHANNEL: /* fall-through */ + case STEREO: + case JOINT_STEREO: + frame->channels = 2; + break; + } + + frame->allocation = (data[1] >> 1) & 0x01; + + frame->subband_mode = (data[1] & 0x01); + frame->subbands = frame->subband_mode ? 8 : 4; + + frame->bitpool = data[2]; + + if ((frame->mode == MONO || frame->mode == DUAL_CHANNEL) && + frame->bitpool > 16 * frame->subbands) + return -4; + + if ((frame->mode == STEREO || frame->mode == JOINT_STEREO) && + frame->bitpool > 32 * frame->subbands) + return -4; + + /* data[3] is crc, we're checking it later */ + + consumed = 32; + + crc_header[0] = data[1]; + crc_header[1] = data[2]; + crc_pos = 16; + + if (frame->mode == JOINT_STEREO) { + if (len * 8 < consumed + frame->subbands) + return -1; + + frame->joint = 0x00; + for (sb = 0; sb < frame->subbands - 1; sb++) + frame->joint |= ((data[4] >> (7 - sb)) & 0x01) << sb; + if (frame->subbands == 4) + crc_header[crc_pos / 8] = data[4] & 0xf0; + else + crc_header[crc_pos / 8] = data[4]; + + consumed += frame->subbands; + crc_pos += frame->subbands; + } + + if (len * 8 < consumed + (4 * frame->subbands * frame->channels)) + return -1; + + for (ch = 0; ch < frame->channels; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + /* FIXME assert(consumed % 4 == 0); */ + frame->scale_factor[ch][sb] = + (data[consumed >> 3] >> (4 - (consumed & 0x7))) & 0x0F; + crc_header[crc_pos >> 3] |= + frame->scale_factor[ch][sb] << (4 - (crc_pos & 0x7)); + + consumed += 4; + crc_pos += 4; + } + } + + if (data[3] != sbc_crc8(crc_header, crc_pos)) + return -3; + + sbc_calculate_bits(frame, bits); + + for (ch = 0; ch < frame->channels; ch++) { + for (sb = 0; sb < frame->subbands; sb++) + levels[ch][sb] = (1 << bits[ch][sb]) - 1; + } + + for (blk = 0; blk < frame->blocks; blk++) { + for (ch = 0; ch < frame->channels; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + if (levels[ch][sb] > 0) { + audio_sample = 0; + for (bit = 0; bit < bits[ch][sb]; bit++) { + if (consumed > len * 8) + return -1; + + if ((data[consumed >> 3] >> (7 - (consumed & 0x7))) & 0x01) + audio_sample |= 1 << (bits[ch][sb] - bit - 1); + + consumed++; + } + + frame->sb_sample[blk][ch][sb] = + (((audio_sample << 1) | 1) << frame->scale_factor[ch][sb]) / + levels[ch][sb] - (1 << frame->scale_factor[ch][sb]); + } else + frame->sb_sample[blk][ch][sb] = 0; + } + } + } + + if (frame->mode == JOINT_STEREO) { + for (blk = 0; blk < frame->blocks; blk++) { + for (sb = 0; sb < frame->subbands; sb++) { + if (frame->joint & (0x01 << sb)) { + temp = frame->sb_sample[blk][0][sb] + + frame->sb_sample[blk][1][sb]; + frame->sb_sample[blk][1][sb] = + frame->sb_sample[blk][0][sb] - + frame->sb_sample[blk][1][sb]; + frame->sb_sample[blk][0][sb] = temp; + } + } + } + } + + if ((consumed & 0x7) != 0) + consumed += 8 - (consumed & 0x7); + + return consumed >> 3; +} + +static void sbc_decoder_init(struct sbc_decoder_state *state, + const struct sbc_frame *frame) +{ + int i, ch; + + memset(state->V, 0, sizeof(state->V)); + state->subbands = frame->subbands; + + for (ch = 0; ch < 2; ch++) + for (i = 0; i < frame->subbands * 2; i++) + state->offset[ch][i] = (10 * i + 10); +} + +static inline void sbc_synthesize_four(struct sbc_decoder_state *state, + struct sbc_frame *frame, int ch, int blk) +{ + int i, k, idx; + int32_t *v = state->V[ch]; + int *offset = state->offset[ch]; + + for (i = 0; i < 8; i++) { + /* Shifting */ + offset[i]--; + if (offset[i] < 0) { + offset[i] = 79; + memcpy(v + 80, v, 9 * sizeof(*v)); + } + + /* Distribute the new matrix value to the shifted position */ + v[offset[i]] = SCALE4_STAGED1( + MULA(synmatrix4[i][0], frame->sb_sample[blk][ch][0], + MULA(synmatrix4[i][1], frame->sb_sample[blk][ch][1], + MULA(synmatrix4[i][2], frame->sb_sample[blk][ch][2], + MUL (synmatrix4[i][3], frame->sb_sample[blk][ch][3]))))); + } + + /* Compute the samples */ + for (idx = 0, i = 0; i < 4; i++, idx += 5) { + k = (i + 4) & 0xf; + + /* Store in output, Q0 */ + frame->pcm_sample[ch][blk * 4 + i] = SCALE4_STAGED2( + MULA(v[offset[i] + 0], sbc_proto_4_40m0[idx + 0], + MULA(v[offset[k] + 1], sbc_proto_4_40m1[idx + 0], + MULA(v[offset[i] + 2], sbc_proto_4_40m0[idx + 1], + MULA(v[offset[k] + 3], sbc_proto_4_40m1[idx + 1], + MULA(v[offset[i] + 4], sbc_proto_4_40m0[idx + 2], + MULA(v[offset[k] + 5], sbc_proto_4_40m1[idx + 2], + MULA(v[offset[i] + 6], sbc_proto_4_40m0[idx + 3], + MULA(v[offset[k] + 7], sbc_proto_4_40m1[idx + 3], + MULA(v[offset[i] + 8], sbc_proto_4_40m0[idx + 4], + MUL( v[offset[k] + 9], sbc_proto_4_40m1[idx + 4]))))))))))); + } +} + +static inline void sbc_synthesize_eight(struct sbc_decoder_state *state, + struct sbc_frame *frame, int ch, int blk) +{ + int i, j, k, idx; + int *offset = state->offset[ch]; + + for (i = 0; i < 16; i++) { + /* Shifting */ + offset[i]--; + if (offset[i] < 0) { + offset[i] = 159; + for (j = 0; j < 9; j++) + state->V[ch][j + 160] = state->V[ch][j]; + } + + /* Distribute the new matrix value to the shifted position */ + state->V[ch][offset[i]] = SCALE8_STAGED1( + MULA(synmatrix8[i][0], frame->sb_sample[blk][ch][0], + MULA(synmatrix8[i][1], frame->sb_sample[blk][ch][1], + MULA(synmatrix8[i][2], frame->sb_sample[blk][ch][2], + MULA(synmatrix8[i][3], frame->sb_sample[blk][ch][3], + MULA(synmatrix8[i][4], frame->sb_sample[blk][ch][4], + MULA(synmatrix8[i][5], frame->sb_sample[blk][ch][5], + MULA(synmatrix8[i][6], frame->sb_sample[blk][ch][6], + MUL( synmatrix8[i][7], frame->sb_sample[blk][ch][7]))))))))); + } + + /* Compute the samples */ + for (idx = 0, i = 0; i < 8; i++, idx += 5) { + k = (i + 8) & 0xf; + + /* Store in output */ + frame->pcm_sample[ch][blk * 8 + i] = SCALE8_STAGED2( // Q0 + MULA(state->V[ch][offset[i] + 0], sbc_proto_8_80m0[idx + 0], + MULA(state->V[ch][offset[k] + 1], sbc_proto_8_80m1[idx + 0], + MULA(state->V[ch][offset[i] + 2], sbc_proto_8_80m0[idx + 1], + MULA(state->V[ch][offset[k] + 3], sbc_proto_8_80m1[idx + 1], + MULA(state->V[ch][offset[i] + 4], sbc_proto_8_80m0[idx + 2], + MULA(state->V[ch][offset[k] + 5], sbc_proto_8_80m1[idx + 2], + MULA(state->V[ch][offset[i] + 6], sbc_proto_8_80m0[idx + 3], + MULA(state->V[ch][offset[k] + 7], sbc_proto_8_80m1[idx + 3], + MULA(state->V[ch][offset[i] + 8], sbc_proto_8_80m0[idx + 4], + MUL( state->V[ch][offset[k] + 9], sbc_proto_8_80m1[idx + 4]))))))))))); + } +} + +static int sbc_synthesize_audio(struct sbc_decoder_state *state, + struct sbc_frame *frame) +{ + int ch, blk; + + switch (frame->subbands) { + case 4: + for (ch = 0; ch < frame->channels; ch++) { + for (blk = 0; blk < frame->blocks; blk++) + sbc_synthesize_four(state, frame, ch, blk); + } + return frame->blocks * 4; + + case 8: + for (ch = 0; ch < frame->channels; ch++) { + for (blk = 0; blk < frame->blocks; blk++) + sbc_synthesize_eight(state, frame, ch, blk); + } + return frame->blocks * 8; + + default: + return -EIO; + } +} + +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] = 9 * frame->subbands; +} + +static inline void _sbc_analyze_four(const int32_t *in, int32_t *out) +{ + sbc_fixed_t t[8], s[5]; + + t[0] = SCALE4_STAGE1( /* Q8 */ + MULA(_sbc_proto_4[0], in[8] - in[32], /* Q18 */ + MUL( _sbc_proto_4[1], in[16] - in[24]))); + + t[1] = SCALE4_STAGE1( + MULA(_sbc_proto_4[2], in[1], + MULA(_sbc_proto_4[3], in[9], + MULA(_sbc_proto_4[4], in[17], + MULA(_sbc_proto_4[5], in[25], + MUL( _sbc_proto_4[6], in[33])))))); + + t[2] = SCALE4_STAGE1( + MULA(_sbc_proto_4[7], in[2], + MULA(_sbc_proto_4[8], in[10], + MULA(_sbc_proto_4[9], in[18], + MULA(_sbc_proto_4[10], in[26], + MUL( _sbc_proto_4[11], in[34])))))); + + t[3] = SCALE4_STAGE1( + MULA(_sbc_proto_4[12], in[3], + MULA(_sbc_proto_4[13], in[11], + MULA(_sbc_proto_4[14], in[19], + MULA(_sbc_proto_4[15], in[27], + MUL( _sbc_proto_4[16], in[35])))))); + + t[4] = SCALE4_STAGE1( + MULA(_sbc_proto_4[17], in[4] + in[36], + MULA(_sbc_proto_4[18], in[12] + in[28], + MUL( _sbc_proto_4[19], in[20])))); + + t[5] = SCALE4_STAGE1( + MULA(_sbc_proto_4[16], in[5], + MULA(_sbc_proto_4[15], in[13], + MULA(_sbc_proto_4[14], in[21], + MULA(_sbc_proto_4[13], in[29], + MUL( _sbc_proto_4[12], in[37])))))); + + /* don't compute t[6]... this term always multiplies + * with cos(pi/2) = 0 */ + + t[7] = SCALE4_STAGE1( + MULA(_sbc_proto_4[6], in[7], + MULA(_sbc_proto_4[5], in[15], + MULA(_sbc_proto_4[4], in[23], + MULA(_sbc_proto_4[3], in[31], + MUL( _sbc_proto_4[2], in[39])))))); + + s[0] = MUL( _anamatrix4[0], t[0] + t[4]); + s[1] = MUL( _anamatrix4[2], t[2]); + s[2] = MULA(_anamatrix4[1], t[1] + t[3], + MUL(_anamatrix4[3], t[5])); + s[3] = MULA(_anamatrix4[3], t[1] + t[3], + MUL(_anamatrix4[1], -t[5] + t[7])); + s[4] = MUL( _anamatrix4[3], t[7]); + + out[0] = SCALE4_STAGE2( s[0] + s[1] + s[2] + s[4]); /* Q0 */ + out[1] = SCALE4_STAGE2(-s[0] + s[1] + s[3]); + out[2] = SCALE4_STAGE2(-s[0] + s[1] - s[3]); + out[3] = SCALE4_STAGE2( s[0] + s[1] - s[2] - s[4]); +} + +static inline void sbc_analyze_four(struct sbc_encoder_state *state, + struct sbc_frame *frame, int ch, int blk) +{ + int32_t *x = &state->X[ch][state->position[ch]]; + int16_t *pcm = &frame->pcm_sample[ch][blk * 4]; + + /* Input 4 Audio Samples */ + x[40] = x[0] = pcm[3]; + x[41] = x[1] = pcm[2]; + x[42] = x[2] = pcm[1]; + x[43] = x[3] = pcm[0]; + + _sbc_analyze_four(x, frame->sb_sample_f[blk][ch]); + + state->position[ch] -= 4; + if (state->position[ch] < 0) + state->position[ch] = 36; +} + +static inline void _sbc_analyze_eight(const int32_t *in, int32_t *out) +{ + sbc_fixed_t t[8], s[8]; + + t[0] = SCALE8_STAGE1( /* Q10 */ + MULA(_sbc_proto_8[0], (in[16] - in[64]), /* Q18 = Q18 * Q0 */ + MULA(_sbc_proto_8[1], (in[32] - in[48]), + MULA(_sbc_proto_8[2], in[4], + MULA(_sbc_proto_8[3], in[20], + MULA(_sbc_proto_8[4], in[36], + MUL( _sbc_proto_8[5], in[52]))))))); + + t[1] = SCALE8_STAGE1( + MULA(_sbc_proto_8[6], in[2], + MULA(_sbc_proto_8[7], in[18], + MULA(_sbc_proto_8[8], in[34], + MULA(_sbc_proto_8[9], in[50], + MUL(_sbc_proto_8[10], in[66])))))); + + t[2] = SCALE8_STAGE1( + MULA(_sbc_proto_8[11], in[1], + MULA(_sbc_proto_8[12], in[17], + MULA(_sbc_proto_8[13], in[33], + MULA(_sbc_proto_8[14], in[49], + MULA(_sbc_proto_8[15], in[65], + MULA(_sbc_proto_8[16], in[3], + MULA(_sbc_proto_8[17], in[19], + MULA(_sbc_proto_8[18], in[35], + MULA(_sbc_proto_8[19], in[51], + MUL( _sbc_proto_8[20], in[67]))))))))))); + + t[3] = SCALE8_STAGE1( + MULA( _sbc_proto_8[21], in[5], + MULA( _sbc_proto_8[22], in[21], + MULA( _sbc_proto_8[23], in[37], + MULA( _sbc_proto_8[24], in[53], + MULA( _sbc_proto_8[25], in[69], + MULA(-_sbc_proto_8[15], in[15], + MULA(-_sbc_proto_8[14], in[31], + MULA(-_sbc_proto_8[13], in[47], + MULA(-_sbc_proto_8[12], in[63], + MUL( -_sbc_proto_8[11], in[79]))))))))))); + + t[4] = SCALE8_STAGE1( + MULA( _sbc_proto_8[26], in[6], + MULA( _sbc_proto_8[27], in[22], + MULA( _sbc_proto_8[28], in[38], + MULA( _sbc_proto_8[29], in[54], + MULA( _sbc_proto_8[30], in[70], + MULA(-_sbc_proto_8[10], in[14], + MULA(-_sbc_proto_8[9], in[30], + MULA(-_sbc_proto_8[8], in[46], + MULA(-_sbc_proto_8[7], in[62], + MUL( -_sbc_proto_8[6], in[78]))))))))))); + + t[5] = SCALE8_STAGE1( + MULA( _sbc_proto_8[31], in[7], + MULA( _sbc_proto_8[32], in[23], + MULA( _sbc_proto_8[33], in[39], + MULA( _sbc_proto_8[34], in[55], + MULA( _sbc_proto_8[35], in[71], + MULA(-_sbc_proto_8[20], in[13], + MULA(-_sbc_proto_8[19], in[29], + MULA(-_sbc_proto_8[18], in[45], + MULA(-_sbc_proto_8[17], in[61], + MUL( -_sbc_proto_8[16], in[77]))))))))))); + + t[6] = SCALE8_STAGE1( + MULA( _sbc_proto_8[36], (in[8] + in[72]), + MULA( _sbc_proto_8[37], (in[24] + in[56]), + MULA( _sbc_proto_8[38], in[40], + MULA(-_sbc_proto_8[39], in[12], + MULA(-_sbc_proto_8[5], in[28], + MULA(-_sbc_proto_8[4], in[44], + MULA(-_sbc_proto_8[3], in[60], + MUL( -_sbc_proto_8[2], in[76]))))))))); + + t[7] = SCALE8_STAGE1( + MULA( _sbc_proto_8[35], in[9], + MULA( _sbc_proto_8[34], in[25], + MULA( _sbc_proto_8[33], in[41], + MULA( _sbc_proto_8[32], in[57], + MULA( _sbc_proto_8[31], in[73], + MULA(-_sbc_proto_8[25], in[11], + MULA(-_sbc_proto_8[24], in[27], + MULA(-_sbc_proto_8[23], in[43], + MULA(-_sbc_proto_8[22], in[59], + MUL( -_sbc_proto_8[21], in[75]))))))))))); + + s[0] = MULA( _anamatrix8[0], t[0], + MUL( _anamatrix8[1], t[6])); + s[1] = MUL( _anamatrix8[7], t[1]); + s[2] = MULA( _anamatrix8[2], t[2], + MULA( _anamatrix8[3], t[3], + MULA( _anamatrix8[4], t[5], + MUL( _anamatrix8[5], t[7])))); + s[3] = MUL( _anamatrix8[6], t[4]); + s[4] = MULA( _anamatrix8[3], t[2], + MULA(-_anamatrix8[5], t[3], + MULA(-_anamatrix8[2], t[5], + MUL( -_anamatrix8[4], t[7])))); + s[5] = MULA( _anamatrix8[4], t[2], + MULA(-_anamatrix8[2], t[3], + MULA( _anamatrix8[5], t[5], + MUL( _anamatrix8[3], t[7])))); + s[6] = MULA( _anamatrix8[1], t[0], + MUL( -_anamatrix8[0], t[6])); + s[7] = MULA( _anamatrix8[5], t[2], + MULA(-_anamatrix8[4], t[3], + MULA( _anamatrix8[3], t[5], + MUL( -_anamatrix8[2], t[7])))); + + out[0] = SCALE8_STAGE2( s[0] + s[1] + s[2] + s[3]); + out[1] = SCALE8_STAGE2( s[1] - s[3] + s[4] + s[6]); + out[2] = SCALE8_STAGE2( s[1] - s[3] + s[5] - s[6]); + out[3] = SCALE8_STAGE2(-s[0] + s[1] + s[3] + s[7]); + out[4] = SCALE8_STAGE2(-s[0] + s[1] + s[3] - s[7]); + out[5] = SCALE8_STAGE2( s[1] - s[3] - s[5] - s[6]); + out[6] = SCALE8_STAGE2( s[1] - s[3] - s[4] + s[6]); + out[7] = SCALE8_STAGE2( s[0] + s[1] - s[2] + s[3]); +} + +static inline void sbc_analyze_eight(struct sbc_encoder_state *state, + struct sbc_frame *frame, int ch, + int blk) +{ + int32_t *x = &state->X[ch][state->position[ch]]; + int16_t *pcm = &frame->pcm_sample[ch][blk * 8]; + + /* Input 8 Audio Samples */ + x[80] = x[0] = pcm[7]; + x[81] = x[1] = pcm[6]; + x[82] = x[2] = pcm[5]; + x[83] = x[3] = pcm[4]; + x[84] = x[4] = pcm[3]; + x[85] = x[5] = pcm[2]; + x[86] = x[6] = pcm[1]; + x[87] = x[7] = pcm[0]; + + _sbc_analyze_eight(x, frame->sb_sample_f[blk][ch]); + + state->position[ch] -= 8; + if (state->position[ch] < 0) + state->position[ch] = 72; +} + +static int sbc_analyze_audio(struct sbc_encoder_state *state, + struct sbc_frame *frame) +{ + int ch, blk; + + switch (frame->subbands) { + case 4: + for (ch = 0; ch < frame->channels; ch++) + for (blk = 0; blk < frame->blocks; blk++) + sbc_analyze_four(state, frame, ch, blk); + return frame->blocks * 4; + + case 8: + for (ch = 0; ch < frame->channels; ch++) + for (blk = 0; blk < frame->blocks; blk++) + sbc_analyze_eight(state, frame, ch, blk); + return frame->blocks * 8; + + default: + return -EIO; + } +} + +/* + * Packs the SBC frame from frame into the memory at data. At most len + * bytes will be used, should more memory be needed an appropriate + * error code will be returned. Returns the length of the packed frame + * on success or a negative value on error. + * + * The error codes are: + * -1 Not enough memory reserved + * -2 Unsupported sampling rate + * -3 Unsupported number of blocks + * -4 Unsupported number of subbands + * -5 Bitpool value out of bounds + * -99 not implemented + */ + +static int sbc_pack_frame(uint8_t *data, struct sbc_frame *frame, size_t len) +{ + int produced; + /* Will copy the header parts for CRC-8 calculation here */ + uint8_t crc_header[11] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; + int crc_pos = 0; + + uint16_t audio_sample; + + int ch, sb, blk, bit; /* channel, subband, block and bit counters */ + int bits[2][8]; /* bits distribution */ + int levels[2][8]; /* levels are derived from that */ + + u_int32_t scalefactor[2][8]; /* derived from frame->scale_factor */ + + data[0] = SBC_SYNCWORD; + + data[1] = (frame->frequency & 0x03) << 6; + + data[1] |= (frame->block_mode & 0x03) << 4; + + data[1] |= (frame->mode & 0x03) << 2; + + data[1] |= (frame->allocation & 0x01) << 1; + + switch (frame->subbands) { + case 4: + /* Nothing to do */ + break; + case 8: + data[1] |= 0x01; + break; + default: + return -4; + break; + } + + data[2] = frame->bitpool; + + if ((frame->mode == MONO || frame->mode == DUAL_CHANNEL) && + frame->bitpool > frame->subbands << 4) + return -5; + + if ((frame->mode == STEREO || frame->mode == JOINT_STEREO) && + frame->bitpool > frame->subbands << 5) + return -5; + + /* Can't fill in crc yet */ + + produced = 32; + + crc_header[0] = data[1]; + 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; + 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]; + uint8_t scale_factor_j[2]; + + frame->joint = 0; + + for (sb = 0; sb < frame->subbands - 1; sb++) { + scale_factor_j[0] = 0; + scalefactor_j[0] = 2; + scale_factor_j[1] = 0; + scalefactor_j[1] = 2; + + for (blk = 0; blk < frame->blocks; blk++) { + /* Calculate joint stereo signal */ + sb_sample_j[blk][0] = + (frame->sb_sample_f[blk][0][sb] + + frame->sb_sample_f[blk][1][sb]) >> 1; + sb_sample_j[blk][1] = + (frame->sb_sample_f[blk][0][sb] - + 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])) { + scale_factor_j[0]++; + scalefactor_j[0] *= 2; + } + while (scalefactor_j[1] < fabs(sb_sample_j[blk][1])) { + scale_factor_j[1]++; + scalefactor_j[1] *= 2; + } + } + + /* decide whether to join this subband */ + if ((scalefactor[0][sb] + scalefactor[1][sb]) > + (scalefactor_j[0] + scalefactor_j[1]) ) { + /* use joint stereo for this subband */ + frame->joint |= 1 << sb; + frame->scale_factor[0][sb] = scale_factor_j[0]; + frame->scale_factor[1][sb] = scale_factor_j[1]; + scalefactor[0][sb] = scalefactor_j[0]; + scalefactor[1][sb] = scalefactor_j[1]; + for (blk = 0; blk < frame->blocks; blk++) { + frame->sb_sample_f[blk][0][sb] = + sb_sample_j[blk][0]; + frame->sb_sample_f[blk][1][sb] = + sb_sample_j[blk][1]; + } + } + } + + data[4] = 0; + for (sb = 0; sb < frame->subbands - 1; sb++) + data[4] |= ((frame->joint >> sb) & 0x01) << (frame->subbands - 1 - sb); + + crc_header[crc_pos >> 3] = data[4]; + + produced += frame->subbands; + crc_pos += frame->subbands; + } + + for (ch = 0; ch < frame->channels; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + data[produced >> 3] <<= 4; + crc_header[crc_pos >> 3] <<= 4; + data[produced >> 3] |= frame->scale_factor[ch][sb] & 0x0F; + crc_header[crc_pos >> 3] |= frame->scale_factor[ch][sb] & 0x0F; + + produced += 4; + crc_pos += 4; + } + } + + /* align the last crc byte */ + if (crc_pos % 8) + crc_header[crc_pos >> 3] <<= 8 - (crc_pos % 8); + + data[3] = sbc_crc8(crc_header, crc_pos); + + sbc_calculate_bits(frame, bits); + + for (ch = 0; ch < frame->channels; ch++) { + for (sb = 0; sb < frame->subbands; sb++) + levels[ch][sb] = (1 << bits[ch][sb]) - 1; + } + + for (blk = 0; blk < frame->blocks; blk++) { + for (ch = 0; ch < frame->channels; ch++) { + for (sb = 0; sb < frame->subbands; sb++) { + if (levels[ch][sb] > 0) { + audio_sample = + (uint16_t) ((((frame->sb_sample_f[blk][ch][sb]*levels[ch][sb]) >> + (frame->scale_factor[ch][sb] + 1)) + + levels[ch][sb]) >> 1); + audio_sample <<= 16 - bits[ch][sb]; + for (bit = 0; bit < bits[ch][sb]; bit++) { + data[produced >> 3] <<= 1; + if (audio_sample & 0x8000) + data[produced >> 3] |= 0x1; + audio_sample <<= 1; + produced++; + } + } + } + } + } + + /* align the last byte */ + if (produced % 8) { + data[produced >> 3] <<= 8 - (produced % 8); + } + + return (produced + 7) >> 3; +} + +struct sbc_priv { + int init; + struct sbc_frame frame; + struct sbc_decoder_state dec_state; + struct sbc_encoder_state enc_state; +}; + +static void sbc_set_defaults(sbc_t *sbc, unsigned long flags) +{ + sbc->frequency = SBC_FREQ_44100; + sbc->mode = SBC_MODE_STEREO; + sbc->subbands = SBC_SB_8; + sbc->blocks = SBC_BLK_16; + sbc->bitpool = 32; +#if __BYTE_ORDER == __LITTLE_ENDIAN + sbc->endian = SBC_LE; +#elif __BYTE_ORDER == __BIG_ENDIAN + sbc->endian = SBC_BE; +#else +#error "Unknown byte order" +#endif +} + +int sbc_init(sbc_t *sbc, unsigned long flags) +{ + if (!sbc) + return -EIO; + + memset(sbc, 0, sizeof(sbc_t)); + + sbc->priv = malloc(sizeof(struct sbc_priv)); + if (!sbc->priv) + return -ENOMEM; + + memset(sbc->priv, 0, sizeof(struct sbc_priv)); + + sbc_set_defaults(sbc, flags); + + return 0; +} + +int sbc_parse(sbc_t *sbc, void *input, int input_len) +{ + return sbc_decode(sbc, input, input_len, NULL, 0, NULL); +} + +int sbc_decode(sbc_t *sbc, void *input, int input_len, void *output, + int output_len, int *written) +{ + struct sbc_priv *priv; + char *ptr; + int i, ch, framelen, samples; + + if (!sbc && !input) + return -EIO; + + priv = sbc->priv; + + framelen = sbc_unpack_frame(input, &priv->frame, input_len); + + if (!priv->init) { + sbc_decoder_init(&priv->dec_state, &priv->frame); + priv->init = 1; + + sbc->frequency = priv->frame.frequency; + sbc->mode = priv->frame.mode; + sbc->subbands = priv->frame.subband_mode; + sbc->blocks = priv->frame.block_mode; + sbc->allocation = priv->frame.allocation; + sbc->bitpool = priv->frame.bitpool; + + priv->frame.codesize = sbc_get_codesize(sbc); + priv->frame.length = sbc_get_frame_length(sbc); + } + + if (!output) + return framelen; + + if (written) + *written = 0; + + samples = sbc_synthesize_audio(&priv->dec_state, &priv->frame); + + ptr = output; + + if (output_len < samples * priv->frame.channels * 2) + samples = output_len / (priv->frame.channels * 2); + + for (i = 0; i < samples; i++) { + for (ch = 0; ch < priv->frame.channels; ch++) { + int16_t s; + s = priv->frame.pcm_sample[ch][i]; + +#if __BYTE_ORDER == __LITTLE_ENDIAN + if (sbc->endian == SBC_BE) { +#elif __BYTE_ORDER == __BIG_ENDIAN + if (sbc->endian == SBC_LE) { +#else +#error "Unknown byte order" +#endif + *ptr++ = (s & 0xff00) >> 8; + *ptr++ = (s & 0x00ff); + } else { + *ptr++ = (s & 0x00ff); + *ptr++ = (s & 0xff00) >> 8; + } + } + } + + if (written) + *written = samples * priv->frame.channels * 2; + + return framelen; +} + +int sbc_encode(sbc_t *sbc, void *input, int input_len, void *output, + int output_len, int *written) +{ + struct sbc_priv *priv; + char *ptr; + int i, ch, framelen, samples; + + if (!sbc && !input) + return -EIO; + + priv = sbc->priv; + + if (written) + *written = 0; + + if (!priv->init) { + priv->frame.frequency = sbc->frequency; + priv->frame.mode = sbc->mode; + priv->frame.channels = sbc->mode == SBC_MODE_MONO ? 1 : 2; + priv->frame.allocation = sbc->allocation; + priv->frame.subband_mode = sbc->subbands; + priv->frame.subbands = sbc->subbands ? 8 : 4; + priv->frame.block_mode = sbc->blocks; + priv->frame.blocks = 4 + (sbc->blocks * 4); + priv->frame.bitpool = sbc->bitpool; + priv->frame.codesize = sbc_get_codesize(sbc); + priv->frame.length = sbc_get_frame_length(sbc); + + sbc_encoder_init(&priv->enc_state, &priv->frame); + priv->init = 1; + } + + /* input must be large enough to encode a complete frame */ + if (input_len < priv->frame.codesize) + return 0; + + /* output must be large enough to receive the encoded frame */ + 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 __BYTE_ORDER == __LITTLE_ENDIAN + if (sbc->endian == SBC_BE) +#elif __BYTE_ORDER == __BIG_ENDIAN + if (sbc->endian == SBC_LE) +#else +#error "Unknown byte order" +#endif + 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; + } + } + + samples = sbc_analyze_audio(&priv->enc_state, &priv->frame); + + framelen = sbc_pack_frame(output, &priv->frame, output_len); + + if (written) + *written = framelen; + + return samples * priv->frame.channels * 2; +} + +void sbc_finish(sbc_t *sbc) +{ + if (!sbc) + return; + + if (sbc->priv) + free(sbc->priv); + + memset(sbc, 0, sizeof(sbc_t)); +} + +int sbc_get_frame_length(sbc_t *sbc) +{ + int ret; + uint8_t subbands, channels, blocks, joint; + struct sbc_priv *priv; + + priv = sbc->priv; + if (!priv->init) { + subbands = sbc->subbands ? 8 : 4; + blocks = 4 + (sbc->blocks * 4); + channels = sbc->mode == SBC_MODE_MONO ? 1 : 2; + joint = sbc->mode == SBC_MODE_JOINT_STEREO ? 1 : 0; + } else { + subbands = priv->frame.subbands; + blocks = priv->frame.blocks; + channels = priv->frame.channels; + joint = priv->frame.joint; + } + + ret = 4 + (4 * subbands * channels) / 8; + + /* This term is not always evenly divide so we round it up */ + if (channels == 1) + ret += ((blocks * channels * sbc->bitpool) + 7) / 8; + else + ret += (((joint ? subbands : 0) + blocks * sbc->bitpool) + 7) + / 8; + + return ret; +} + +int sbc_get_frame_duration(sbc_t *sbc) +{ + uint8_t subbands, blocks; + uint16_t frequency; + struct sbc_priv *priv; + + priv = sbc->priv; + if (!priv->init) { + subbands = sbc->subbands ? 8 : 4; + blocks = 4 + (sbc->blocks * 4); + } else { + subbands = priv->frame.subbands; + blocks = priv->frame.blocks; + } + + switch (sbc->frequency) { + case SBC_FREQ_16000: + frequency = 16000; + break; + + case SBC_FREQ_32000: + frequency = 32000; + break; + + case SBC_FREQ_44100: + frequency = 44100; + break; + + case SBC_FREQ_48000: + frequency = 48000; + break; + default: + return 0; + } + + return (1000000 * blocks * subbands) / frequency; +} + +int sbc_get_codesize(sbc_t *sbc) +{ + uint8_t subbands, channels, blocks; + struct sbc_priv *priv; + + priv = sbc->priv; + if (!priv->init) { + subbands = sbc->subbands ? 8 : 4; + blocks = 4 + (sbc->blocks * 4); + channels = sbc->mode == SBC_MODE_MONO ? 1 : 2; + } else { + subbands = priv->frame.subbands; + blocks = priv->frame.blocks; + channels = priv->frame.channels; + } + + return subbands * blocks * channels * 2; +} + +int sbc_reinit(sbc_t *sbc, unsigned long flags) +{ + struct sbc_priv *priv; + + if (!sbc || !sbc->priv) + return -EIO; + + priv = sbc->priv; + + if (priv->init == 1) + memset(sbc->priv, 0, sizeof(struct sbc_priv)); + + sbc_set_defaults(sbc, flags); + + return 0; +} |