| /* |
| * |
| * 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 <limits.h> |
| |
| #include "sbc_math.h" |
| #include "sbc_tables.h" |
| |
| #include "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]; |
| int16_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_STAGED1( |
| 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_STAGED1( // 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 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 inline void sbc_analyze_four(struct sbc_encoder_state *state, |
| struct sbc_frame *frame, int ch, int blk) |
| { |
| int16_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 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 inline void sbc_analyze_eight(struct sbc_encoder_state *state, |
| struct sbc_frame *frame, int ch, |
| int blk) |
| { |
| int16_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; |
| } |
| } |
| |
| /* 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));\ |
| |
| /* |
| * 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) |
| { |
| /* Bitstream writer starts from the fourth byte */ |
| uint8_t *data_ptr = data + 4; |
| uint32_t bits_cache = 0; |
| uint32_t bits_count = 0; |
| |
| /* 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; /* 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 */ |
| |
| 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 << 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]; |
| uint8_t scale_factor_j[2]; |
| |
| uint8_t joint = 0; |
| frame->joint = 0; |
| |
| 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++) { |
| /* 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); |
| sb_sample_j[blk][1] = |
| 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])) { |
| 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 ((frame->scale_factor[0][sb] + |
| frame->scale_factor[1][sb]) > |
| (scale_factor_j[0] + |
| scale_factor_j[1])) { |
| /* use joint stereo for this subband */ |
| 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]; |
| 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]; |
| } |
| } |
| } |
| |
| PUT_BITS(joint, frame->subbands); |
| crc_header[crc_pos >> 3] = joint; |
| 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); |
| crc_header[crc_pos >> 3] <<= 4; |
| crc_header[crc_pos >> 3] |= frame->scale_factor[ch][sb] & 0x0F; |
| 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 (bits[ch][sb] == 0) |
| continue; |
| |
| audio_sample = ((uint64_t) levels[ch][sb] * |
| (((uint32_t) 1 << |
| (frame->scale_factor[ch][sb] + |
| SCALE_OUT_BITS + 1)) + |
| frame->sb_sample_f[blk][ch][sb])) >> |
| (frame->scale_factor[ch][sb] + |
| SCALE_OUT_BITS + 2); |
| |
| PUT_BITS(audio_sample, bits[ch][sb]); |
| } |
| } |
| } |
| |
| FLUSH_BITS(); |
| |
| return data_ptr - data; |
| } |
| |
| 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; |
| |
| if (framelen <= 0) |
| return framelen; |
| |
| 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; |
| } |
