| /* |
| * |
| * Bluetooth low-complexity, subband codec (SBC) library |
| * |
| * Copyright (C) 2004-2007 Marcel Holtmann <marcel@holtmann.org> |
| * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> |
| * Copyright (C) 2005-2006 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 <stdint.h> |
| #include <malloc.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| |
| |
| #include "sbc_math.h" |
| #include "sbc_tables.h" |
| |
| #include "sbc.h" |
| |
| #define SBC_SYNCWORD 0x9C |
| |
| /* sampling frequency */ |
| #define SBC_FS_16 0x00 |
| #define SBC_FS_32 0x01 |
| #define SBC_FS_44 0x02 |
| #define SBC_FS_48 0x03 |
| |
| /* nrof_blocks */ |
| #define SBC_NB_4 0x00 |
| #define SBC_NB_8 0x01 |
| #define SBC_NB_12 0x02 |
| #define SBC_NB_16 0x03 |
| |
| /* channel mode */ |
| #define SBC_CM_MONO 0x00 |
| #define SBC_CM_DUAL_CHANNEL 0x01 |
| #define SBC_CM_STEREO 0x02 |
| #define SBC_CM_JOINT_STEREO 0x03 |
| |
| /* allocation mode */ |
| #define SBC_AM_LOUDNESS 0x00 |
| #define SBC_AM_SNR 0x01 |
| |
| /* subbands */ |
| #define SBC_SB_4 0x00 |
| #define SBC_SB_8 0x01 |
| |
| /* This structure contains an unpacked SBC frame. |
| Yes, there is probably quite some unused space herein */ |
| struct sbc_frame { |
| uint16_t sampling_frequency; /* in kHz */ |
| uint8_t blocks; |
| enum { |
| MONO = SBC_CM_MONO, |
| DUAL_CHANNEL = SBC_CM_DUAL_CHANNEL, |
| STEREO = SBC_CM_STEREO, |
| JOINT_STEREO = SBC_CM_JOINT_STEREO |
| } channel_mode; |
| uint8_t channels; |
| enum { |
| LOUDNESS = SBC_AM_LOUDNESS, |
| SNR = SBC_AM_SNR |
| } allocation_method; |
| uint8_t subbands; |
| uint8_t bitpool; |
| uint8_t join; /* bit number x set means joint stereo has been used in subband x */ |
| uint8_t scale_factor[2][8]; /* only the lower 4 bits of every element are to be used */ |
| uint16_t audio_sample[16][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; |
| int32_t X[2][80]; |
| }; |
| |
| /* |
| * 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) |
| { |
| if (frame->channel_mode == MONO || frame->channel_mode == DUAL_CHANNEL) { |
| int bitneed[2][8], loudness, max_bitneed, bitcount, slicecount, bitslice; |
| int ch, sb; |
| |
| for (ch = 0; ch < frame->channels; ch++) { |
| if (frame->allocation_method == SNR) { |
| for (sb = 0; sb < frame->subbands; sb++) { |
| bitneed[ch][sb] = frame->scale_factor[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; |
| } |
| } |
| } |
| } |
| |
| max_bitneed = 0; |
| for (sb = 0; sb < frame->subbands; sb++) { |
| 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; |
| } |
| } |
| |
| sb = 0; |
| while (bitcount < frame->bitpool && sb < frame->subbands) { |
| 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; |
| } |
| sb++; |
| } |
| |
| sb = 0; |
| while (bitcount < frame->bitpool && sb < frame->subbands) { |
| if (bits[ch][sb] < 16) { |
| bits[ch][sb]++; |
| bitcount++; |
| } |
| sb++; |
| } |
| |
| } |
| |
| } else if (frame->channel_mode == STEREO || frame->channel_mode == JOINT_STEREO) { |
| int bitneed[2][8], loudness, max_bitneed, bitcount, slicecount, bitslice; |
| int ch, sb; |
| |
| if (frame->allocation_method == SNR) { |
| for (ch = 0; ch < 2; ch++) { |
| for (sb = 0; sb < frame->subbands; sb++) { |
| bitneed[ch][sb] = frame->scale_factor[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; |
| } |
| } |
| } |
| } |
| } |
| |
| max_bitneed = 0; |
| for (ch = 0; ch < 2; ch++) { |
| for (sb = 0; sb < frame->subbands; sb++) { |
| 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) && (sb < frame->subbands)) { |
| 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++; |
| } else { |
| ch = 1; |
| } |
| } |
| |
| ch = 0; |
| sb = 0; |
| while ((bitcount < frame->bitpool) && (sb < frame->subbands)) { |
| if (bits[ch][sb] < 16) { |
| bits[ch][sb]++; |
| bitcount++; |
| } |
| if (ch == 1) { |
| ch = 0; |
| sb++; |
| } 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; |
| |
| uint8_t sf; /* sampling_frequency, temporarily needed as array index */ |
| |
| int ch, sb, blk, bit; /* channel, subband, block and bit standard counters */ |
| int bits[2][8]; /* bits distribution */ |
| int levels[2][8]; /* levels derived from that */ |
| |
| if (len < 4) |
| return -1; |
| |
| if (data[0] != SBC_SYNCWORD) |
| return -2; |
| |
| sf = (data[1] >> 6) & 0x03; |
| switch (sf) { |
| case SBC_FS_16: |
| frame->sampling_frequency = 16000; |
| break; |
| case SBC_FS_32: |
| frame->sampling_frequency = 32000; |
| break; |
| case SBC_FS_44: |
| frame->sampling_frequency = 44100; |
| break; |
| case SBC_FS_48: |
| frame->sampling_frequency = 48000; |
| break; |
| } |
| |
| switch ((data[1] >> 4) & 0x03) { |
| case SBC_NB_4: |
| frame->blocks = 4; |
| break; |
| case SBC_NB_8: |
| frame->blocks = 8; |
| break; |
| case SBC_NB_12: |
| frame->blocks = 12; |
| break; |
| case SBC_NB_16: |
| frame->blocks = 16; |
| break; |
| } |
| |
| frame->channel_mode = (data[1] >> 2) & 0x03; |
| switch (frame->channel_mode) { |
| case MONO: |
| frame->channels = 1; |
| break; |
| case DUAL_CHANNEL: /* fall-through */ |
| case STEREO: |
| case JOINT_STEREO: |
| frame->channels = 2; |
| break; |
| } |
| |
| frame->allocation_method = (data[1] >> 1) & 0x01; |
| |
| frame->subbands = (data[1] & 0x01) ? 8 : 4; |
| |
| frame->bitpool = data[2]; |
| |
| if (((frame->channel_mode == MONO || frame->channel_mode == DUAL_CHANNEL) |
| && frame->bitpool > 16 * frame->subbands) |
| || ((frame->channel_mode == STEREO || frame->channel_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->channel_mode == JOINT_STEREO) { |
| if (len * 8 < consumed + frame->subbands) |
| return -1; |
| |
| frame->join = 0x00; |
| for (sb = 0; sb < frame->subbands - 1; sb++) { |
| frame->join |= ((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, sf); |
| |
| for (blk = 0; blk < frame->blocks; blk++) { |
| for (ch = 0; ch < frame->channels; ch++) { |
| for (sb = 0; sb < frame->subbands; sb++) { |
| frame->audio_sample[blk][ch][sb] = 0; |
| if (bits[ch][sb] == 0) |
| continue; |
| |
| for (bit = 0; bit < bits[ch][sb]; bit++) { |
| int b; /* A bit */ |
| if (consumed > len * 8) |
| return -1; |
| |
| b = (data[consumed >> 3] >> (7 - (consumed & 0x7))) & 0x01; |
| frame->audio_sample[blk][ch][sb] |= b << (bits[ch][sb] - bit - 1); |
| |
| consumed++; |
| } |
| } |
| } |
| } |
| |
| 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) { |
| frame->sb_sample[blk][ch][sb] = |
| (((frame->audio_sample[blk][ch][sb] << 16) | 0x8000) / levels[ch][sb]) - 0x8000; |
| |
| frame->sb_sample[blk][ch][sb] >>= 3; |
| frame->sb_sample[blk][ch][sb] = (frame->sb_sample[blk][ch][sb] << (frame->scale_factor[ch][sb] + 1)); // Q13 |
| |
| } else { |
| frame->sb_sample[blk][ch][sb] = 0; |
| } |
| } |
| } |
| } |
| |
| if (frame->channel_mode == JOINT_STEREO) { |
| for (blk = 0; blk < frame->blocks; blk++) { |
| for (sb = 0; sb < frame->subbands; sb++) { |
| if (frame->join & (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, j, k, idx; |
| sbc_extended_t res; |
| |
| for(i = 0; i < 8; i++) { |
| /* Shifting */ |
| state->offset[ch][i]--; |
| if (state->offset[ch][i] < 0) { |
| state->offset[ch][i] = 79; |
| for(j = 0; j < 9; j++) { |
| state->V[ch][j+80] = state->V[ch][j]; |
| } |
| } |
| } |
| |
| |
| for(i = 0; i < 8; i++) { |
| /* Distribute the new matrix value to the shifted position */ |
| SBC_FIXED_0(res); |
| for (j = 0; j < 4; j++) { |
| MULA(res, synmatrix4[i][j], frame->sb_sample[blk][ch][j]); |
| } |
| state->V[ch][state->offset[ch][i]] = SCALE4_STAGED1(res); |
| } |
| |
| /* Compute the samples */ |
| for(idx = 0, i = 0; i < 4; i++) { |
| k = (i + 4) & 0xf; |
| SBC_FIXED_0(res); |
| for(j = 0; j < 10; idx++) { |
| MULA(res, state->V[ch][state->offset[ch][i]+j++], sbc_proto_4_40m0[idx]); |
| MULA(res, state->V[ch][state->offset[ch][k]+j++], sbc_proto_4_40m1[idx]); |
| } |
| /* Store in output */ |
| frame->pcm_sample[ch][blk * 4 + i] = SCALE4_STAGED2(res); // Q0 |
| } |
| } |
| |
| static inline void sbc_synthesize_eight(struct sbc_decoder_state *state, |
| struct sbc_frame *frame, int ch, int blk) |
| { |
| int i, j, k, idx; |
| sbc_extended_t res; |
| |
| for(i = 0; i < 16; i++) { |
| /* Shifting */ |
| state->offset[ch][i]--; |
| if (state->offset[ch][i] < 0) { |
| state->offset[ch][i] = 159; |
| for(j = 0; j < 9; j++) { |
| state->V[ch][j+160] = state->V[ch][j]; |
| } |
| } |
| } |
| |
| for(i = 0; i < 16; i++) { |
| /* Distribute the new matrix value to the shifted position */ |
| SBC_FIXED_0(res); |
| for (j = 0; j < 8; j++) { |
| MULA(res, synmatrix8[i][j], frame->sb_sample[blk][ch][j]); // Q28 = Q15 * Q13 |
| } |
| state->V[ch][state->offset[ch][i]] = SCALE8_STAGED1(res); // Q10 |
| } |
| |
| |
| /* Compute the samples */ |
| for(idx = 0, i = 0; i < 8; i++) { |
| k = (i + 8) & 0xf; |
| SBC_FIXED_0(res); |
| for(j = 0; j < 10; idx++) { |
| MULA(res, state->V[ch][state->offset[ch][i]+j++], sbc_proto_8_80m0[idx]); |
| MULA(res, state->V[ch][state->offset[ch][k]+j++], sbc_proto_8_80m1[idx]); |
| } |
| /* Store in output */ |
| frame->pcm_sample[ch][blk * 8 + i] = SCALE8_STAGED2(res); // Q0 |
| |
| } |
| } |
| |
| 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; |
| } |
| |
| static inline void _sbc_analyze_four(const int32_t *in, int32_t *out) |
| { |
| |
| sbc_extended_t res; |
| sbc_extended_t t[8]; |
| sbc_extended_t s[4]; |
| |
| MUL(res, _sbc_proto_4[0], (in[8] - in[32])); // Q18 |
| MULA(res, _sbc_proto_4[1], (in[16] - in[24])); |
| t[0] = SCALE4_STAGE1(res); // Q8 |
| |
| MUL(res, _sbc_proto_4[2], in[1]); |
| MULA(res, _sbc_proto_4[3], in[9]); |
| MULA(res, _sbc_proto_4[4], in[17]); |
| MULA(res, _sbc_proto_4[5], in[25]); |
| MULA(res, _sbc_proto_4[6], in[33]); |
| t[1] = SCALE4_STAGE1(res); |
| |
| MUL(res, _sbc_proto_4[7], in[2]); |
| MULA(res, _sbc_proto_4[8], in[10]); |
| MULA(res, _sbc_proto_4[9], in[18]); |
| MULA(res, _sbc_proto_4[10], in[26]); |
| MULA(res, _sbc_proto_4[11], in[34]); |
| t[2] = SCALE4_STAGE1(res); |
| |
| MUL(res, _sbc_proto_4[12], in[3]); |
| MULA(res, _sbc_proto_4[13], in[11]); |
| MULA(res, _sbc_proto_4[14], in[19]); |
| MULA(res, _sbc_proto_4[15], in[27]); |
| MULA(res, _sbc_proto_4[16], in[35]); |
| t[3] = SCALE4_STAGE1(res); |
| |
| MUL(res, _sbc_proto_4[17], in[4] + in[36]); |
| MULA(res, _sbc_proto_4[18], in[12] + in[28]); |
| MULA(res, _sbc_proto_4[19], in[20]); |
| t[4] = SCALE4_STAGE1(res); |
| |
| MUL(res, _sbc_proto_4[16], in[5]); |
| MULA(res, _sbc_proto_4[15], in[13]); |
| MULA(res, _sbc_proto_4[14], in[21]); |
| MULA(res, _sbc_proto_4[13], in[29]); |
| MULA(res, _sbc_proto_4[12], in[37]); |
| t[5] = SCALE4_STAGE1(res); |
| |
| /* don't compute t[6]... this term always multiplies with cos(pi/2) = 0 */ |
| |
| MUL(res, _sbc_proto_4[6], in[7]); |
| MULA(res, _sbc_proto_4[5], in[15]); |
| MULA(res, _sbc_proto_4[4], in[23]); |
| MULA(res, _sbc_proto_4[3], in[31]); |
| MULA(res, _sbc_proto_4[2], in[39]); |
| t[7] = SCALE4_STAGE1(res); |
| |
| MUL(s[0], _anamatrix4[0], t[0] + t[4]); |
| MUL(s[1], _anamatrix4[2], t[2]); |
| MUL(s[2], _anamatrix4[1], t[1] + t[3]); |
| MULA(s[2], _anamatrix4[3], t[5] + t[7]); |
| MUL(s[3], _anamatrix4[3], t[1] + t[3]); |
| MULA(s[3], _anamatrix4[1], - t[5] + t[7]); |
| out[0] = SCALE4_STAGE2( s[0] + s[1] + s[2]); // 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]); |
| } |
| static inline void sbc_analyze_four(struct sbc_encoder_state *state, |
| struct sbc_frame *frame, int ch, int blk) |
| { |
| int i; |
| /* Input 4 New Audio Samples */ |
| for (i = 39; i >= 4; i--) |
| state->X[ch][i] = state->X[ch][i - 4]; |
| for (i = 3; i >= 0; i--) |
| state->X[ch][i] = frame->pcm_sample[ch][blk * 4 + (3 - i)]; |
| _sbc_analyze_four(state->X[ch], frame->sb_sample_f[blk][ch]); |
| } |
| |
| static inline void _sbc_analyze_eight(const int32_t *in, int32_t *out) |
| { |
| sbc_extended_t res; |
| sbc_extended_t t[8]; |
| sbc_extended_t s[8]; |
| |
| MUL(res, _sbc_proto_8[0], (in[16] - in[64])); // Q18 = Q18 * Q0 |
| MULA(res, _sbc_proto_8[1], (in[32] - in[48])); |
| MULA(res, _sbc_proto_8[2], in[4]); |
| MULA(res, _sbc_proto_8[3], in[20]); |
| MULA(res, _sbc_proto_8[4], in[36]); |
| MULA(res, _sbc_proto_8[5], in[52]); |
| t[0] = SCALE8_STAGE1(res); // Q10 |
| |
| MUL(res, _sbc_proto_8[6], in[2]); |
| MULA(res, _sbc_proto_8[7], in[18]); |
| MULA(res, _sbc_proto_8[8], in[34]); |
| MULA(res, _sbc_proto_8[9], in[50]); |
| MULA(res, _sbc_proto_8[10], in[66]); |
| t[1] = SCALE8_STAGE1(res); |
| |
| MUL(res, _sbc_proto_8[11], in[1]); |
| MULA(res, _sbc_proto_8[12], in[17]); |
| MULA(res, _sbc_proto_8[13], in[33]); |
| MULA(res, _sbc_proto_8[14], in[49]); |
| MULA(res, _sbc_proto_8[15], in[65]); |
| MULA(res, _sbc_proto_8[16], in[3]); |
| MULA(res, _sbc_proto_8[17], in[19]); |
| MULA(res, _sbc_proto_8[18], in[35]); |
| MULA(res, _sbc_proto_8[19], in[51]); |
| MULA(res, _sbc_proto_8[20], in[67]); |
| t[2] = SCALE8_STAGE1(res); |
| |
| MUL(res, _sbc_proto_8[21], in[5]); |
| MULA(res, _sbc_proto_8[22], in[21]); |
| MULA(res, _sbc_proto_8[23], in[37]); |
| MULA(res, _sbc_proto_8[24], in[53]); |
| MULA(res, _sbc_proto_8[25], in[69]); |
| MULA(res, -_sbc_proto_8[15], in[15]); |
| MULA(res, -_sbc_proto_8[14], in[31]); |
| MULA(res, -_sbc_proto_8[13], in[47]); |
| MULA(res, -_sbc_proto_8[12], in[63]); |
| MULA(res, -_sbc_proto_8[11], in[79]); |
| t[3] = SCALE8_STAGE1(res); |
| |
| MUL(res, _sbc_proto_8[26], in[6]); |
| MULA(res, _sbc_proto_8[27], in[22]); |
| MULA(res, _sbc_proto_8[28], in[38]); |
| MULA(res, _sbc_proto_8[29], in[54]); |
| MULA(res, _sbc_proto_8[30], in[70]); |
| MULA(res, -_sbc_proto_8[10], in[14]); |
| MULA(res, -_sbc_proto_8[9], in[30]); |
| MULA(res, -_sbc_proto_8[8], in[46]); |
| MULA(res, -_sbc_proto_8[7], in[62]); |
| MULA(res, -_sbc_proto_8[6], in[78]); |
| t[4] = SCALE8_STAGE1(res); |
| |
| MUL(res, _sbc_proto_8[31], in[7]); |
| MULA(res, _sbc_proto_8[32], in[23]); |
| MULA(res, _sbc_proto_8[33], in[39]); |
| MULA(res, _sbc_proto_8[34], in[55]); |
| MULA(res, _sbc_proto_8[35], in[71]); |
| MULA(res, -_sbc_proto_8[20], in[13]); |
| MULA(res, -_sbc_proto_8[19], in[29]); |
| MULA(res, -_sbc_proto_8[18], in[45]); |
| MULA(res, -_sbc_proto_8[17], in[61]); |
| MULA(res, -_sbc_proto_8[16], in[77]); |
| t[5] = SCALE8_STAGE1(res); |
| |
| MUL(res, _sbc_proto_8[36], in[8] + in[72]); |
| MULA(res, _sbc_proto_8[37], in[24] + in[56]); |
| MULA(res, _sbc_proto_8[38], in[40]); |
| MULA(res, -_sbc_proto_8[39], in[12]); |
| MULA(res, -_sbc_proto_8[5], in[28]); |
| MULA(res, -_sbc_proto_8[4], in[44]); |
| MULA(res, -_sbc_proto_8[3], in[60]); |
| MULA(res, -_sbc_proto_8[2], in[76]); |
| t[6] = SCALE8_STAGE1(res); |
| |
| MUL(res, _sbc_proto_8[35], in[9]); |
| MULA(res, _sbc_proto_8[34], in[25]); |
| MULA(res, _sbc_proto_8[33], in[41]); |
| MULA(res, _sbc_proto_8[32], in[57]); |
| MULA(res, _sbc_proto_8[31], in[73]); |
| MULA(res, -_sbc_proto_8[25], in[11]); |
| MULA(res, -_sbc_proto_8[24], in[27]); |
| MULA(res, -_sbc_proto_8[23], in[43]); |
| MULA(res, -_sbc_proto_8[22], in[59]); |
| MULA(res, -_sbc_proto_8[21], in[75]); |
| t[7] = SCALE8_STAGE1(res); |
| |
| MUL(s[0], _anamatrix8[0], t[0]); // = Q14 * Q10 |
| MULA(s[0], _anamatrix8[1], t[6]); |
| MUL(s[1], _anamatrix8[7], t[1]); |
| MUL(s[2], _anamatrix8[2], t[2]); |
| MULA(s[2], _anamatrix8[3], t[3]); |
| MULA(s[2], _anamatrix8[4], t[5]); |
| MULA(s[2], _anamatrix8[5], t[7]); |
| MUL(s[3], _anamatrix8[6], t[4]); |
| MUL(s[4], _anamatrix8[3], t[2]); |
| MULA(s[4], -_anamatrix8[5], t[3]); |
| MULA(s[4], -_anamatrix8[2], t[5]); |
| MULA(s[4], -_anamatrix8[4], t[7]); |
| MUL(s[5], _anamatrix8[4], t[2]); |
| MULA(s[5], -_anamatrix8[2], t[3]); |
| MULA(s[5], _anamatrix8[5], t[5]); |
| MULA(s[5], _anamatrix8[3], t[7]); |
| MUL(s[6], _anamatrix8[1], t[0]); |
| MULA(s[6], -_anamatrix8[0], t[6]); |
| MUL(s[7], _anamatrix8[5], t[2]); |
| MULA(s[7], -_anamatrix8[4], t[3]); |
| MULA(s[7], _anamatrix8[3], t[5]); |
| MULA(s[7], -_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) |
| { |
| int i; |
| |
| /* Input 8 Audio Samples */ |
| for (i = 79; i >= 8; i--) |
| state->X[ch][i] = state->X[ch][i - 8]; |
| for (i = 7; i >= 0; i--) |
| state->X[ch][i] = frame->pcm_sample[ch][blk * 8 + (7 - i)]; |
| _sbc_analyze_eight(state->X[ch], frame->sb_sample_f[blk][ch]); |
| } |
| |
| 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; |
| |
| uint8_t sf; /* Sampling frequency as temporary value for table lookup */ |
| |
| 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 */ |
| |
| if (len < 4) { |
| return -1; |
| } |
| |
| /* Clear first 4 bytes of data (that's the constant length part of the SBC header) */ |
| memset(data, 0, 4); |
| |
| data[0] = SBC_SYNCWORD; |
| |
| if (frame->sampling_frequency == 16000) { |
| data[1] |= (SBC_FS_16 & 0x03) << 6; |
| sf = SBC_FS_16; |
| } else if (frame->sampling_frequency == 32000) { |
| data[1] |= (SBC_FS_32 & 0x03) << 6; |
| sf = SBC_FS_32; |
| } else if (frame->sampling_frequency == 44100) { |
| data[1] |= (SBC_FS_44 & 0x03) << 6; |
| sf = SBC_FS_44; |
| } else if (frame->sampling_frequency == 48000) { |
| data[1] |= (SBC_FS_48 & 0x03) << 6; |
| sf = SBC_FS_48; |
| } else { |
| return -2; |
| } |
| |
| switch (frame->blocks) { |
| case 4: |
| data[1] |= (SBC_NB_4 & 0x03) << 4; |
| break; |
| case 8: |
| data[1] |= (SBC_NB_8 & 0x03) << 4; |
| break; |
| case 12: |
| data[1] |= (SBC_NB_12 & 0x03) << 4; |
| break; |
| case 16: |
| data[1] |= (SBC_NB_16 & 0x03) << 4; |
| break; |
| default: |
| return -3; |
| break; |
| } |
| |
| data[1] |= (frame->channel_mode & 0x03) << 2; |
| |
| data[1] |= (frame->allocation_method & 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->channel_mode == MONO || frame->channel_mode == DUAL_CHANNEL) |
| && frame->bitpool > 16 * frame->subbands) |
| || ((frame->channel_mode == STEREO || frame->channel_mode == JOINT_STEREO) |
| && frame->bitpool > 32 * frame->subbands)) { |
| 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->channel_mode == JOINT_STEREO) { |
| int32_t sb_sample_j[16][2][7]; /* like frame->sb_sample but joint stereo */ |
| int scalefactor_j[2][7], scale_factor_j[2][7]; /* scalefactor and scale_factor in joint case */ |
| |
| /* Calculate joint stereo signal */ |
| for (sb = 0; sb < frame->subbands - 1; sb++) { |
| for (blk = 0; blk < frame->blocks; blk++) { |
| sb_sample_j[blk][0][sb] = (frame->sb_sample_f[blk][0][sb] + frame->sb_sample_f[blk][1][sb]) >> 1; |
| sb_sample_j[blk][1][sb] = (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 */ |
| for (ch = 0; ch < 2; ch++) { |
| for (sb = 0; sb < frame->subbands - 1; sb++) { |
| scale_factor_j[ch][sb] = 0; |
| scalefactor_j[ch][sb] = 2; |
| for (blk = 0; blk < frame->blocks; blk++) { |
| while (scalefactor_j[ch][sb] < fabs(sb_sample_j[blk][ch][sb])) { |
| scale_factor_j[ch][sb]++; |
| scalefactor_j[ch][sb] *= 2; |
| } |
| } |
| } |
| } |
| |
| /* decide which subbands to join */ |
| frame->join = 0; |
| for (sb = 0; sb < frame->subbands - 1; sb++) { |
| if ((scalefactor[0][sb] + scalefactor[1][sb]) > |
| (scalefactor_j[0][sb] + scalefactor_j[1][sb]) ) { |
| /* use joint stereo for this subband */ |
| frame->join |= 1 << sb; |
| frame->scale_factor[0][sb] = scale_factor_j[0][sb]; |
| frame->scale_factor[1][sb] = scale_factor_j[1][sb]; |
| scalefactor[0][sb] = scalefactor_j[0][sb]; |
| scalefactor[1][sb] = scalefactor_j[1][sb]; |
| for (blk = 0; blk < frame->blocks; blk++) { |
| frame->sb_sample_f[blk][0][sb] = sb_sample_j[blk][0][sb]; |
| frame->sb_sample_f[blk][1][sb] = sb_sample_j[blk][1][sb]; |
| } |
| } |
| } |
| |
| if (len * 8 < produced + frame->subbands) |
| return -1; |
| |
| data[4] = 0; |
| for (sb = 0; sb < frame->subbands - 1; sb++) { |
| data[4] |= ((frame->join >> sb) & 0x01) << (7 - sb); |
| } |
| if (frame->subbands == 4) { |
| crc_header[crc_pos / 8] = data[4] & 0xf0; |
| } else { |
| crc_header[crc_pos / 8] = data[4]; |
| } |
| |
| produced += frame->subbands; |
| crc_pos += frame->subbands; |
| } |
| |
| if (len * 8 < produced + (4 * frame->subbands * frame->channels)) |
| return -1; |
| |
| for (ch = 0; ch < frame->channels; ch++) { |
| for (sb = 0; sb < frame->subbands; sb++) { |
| if (produced % 8 == 0) |
| data[produced / 8] = 0; |
| data[produced / 8] |= ((frame->scale_factor[ch][sb] & 0x0F) << (4 - (produced % 8))); |
| crc_header[crc_pos / 8] |= ((frame->scale_factor[ch][sb] & 0x0F) << (4 - (crc_pos % 8))); |
| |
| produced += 4; |
| crc_pos += 4; |
| } |
| } |
| |
| data[3] = sbc_crc8(crc_header, crc_pos); |
| |
| sbc_calculate_bits(frame, bits, sf); |
| |
| 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) { |
| frame->audio_sample[blk][ch][sb] = |
| (uint16_t) ((((frame->sb_sample_f[blk][ch][sb]*levels[ch][sb]) >> (frame->scale_factor[ch][sb] + 1)) + |
| levels[ch][sb]) >> 1); |
| } else { |
| frame->audio_sample[blk][ch][sb] = 0; |
| } |
| } |
| } |
| } |
| |
| 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) { |
| for (bit = 0; bit < bits[ch][sb]; bit++) { |
| int b; /* A bit */ |
| if (produced > len * 8) { |
| return -1; |
| } |
| if (produced % 8 == 0) { |
| data[produced / 8] = 0; |
| } |
| b = ((frame->audio_sample[blk][ch][sb]) >> (bits[ch][sb] - bit - |
| 1)) & 0x01; |
| data[produced / 8] |= b << (7 - (produced % 8)); |
| produced++; |
| } |
| } |
| } |
| } |
| } |
| |
| if (produced % 8 != 0) { |
| produced += 8 - (produced % 8); |
| } |
| |
| return produced / 8; |
| } |
| |
| struct sbc_priv { |
| int init; |
| struct sbc_frame frame; |
| struct sbc_decoder_state dec_state; |
| struct sbc_encoder_state enc_state; |
| }; |
| |
| 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->rate = 44100; |
| sbc->channels = 2; |
| sbc->joint = 0; |
| sbc->subbands = 8; |
| sbc->blocks = 16; |
| sbc->bitpool = 32; |
| sbc->swap = 0; |
| |
| return 0; |
| } |
| |
| int sbc_parse(sbc_t *sbc, void *data, int count) |
| { |
| return sbc_decode(sbc, data, count); |
| } |
| |
| int sbc_decode(sbc_t *sbc, void *data, int count) |
| { |
| struct sbc_priv *priv; |
| char *ptr; |
| int i, ch, framelen, samples; |
| |
| if (!sbc) |
| return -EIO; |
| |
| priv = sbc->priv; |
| |
| framelen = sbc_unpack_frame(data, &priv->frame, count); |
| |
| |
| if (!priv->init) { |
| sbc_decoder_init(&priv->dec_state, &priv->frame); |
| priv->init = 1; |
| |
| sbc->rate = priv->frame.sampling_frequency; |
| sbc->channels = priv->frame.channels; |
| sbc->subbands = priv->frame.subbands; |
| sbc->blocks = priv->frame.blocks; |
| sbc->bitpool = priv->frame.bitpool; |
| } |
| |
| samples = sbc_synthesize_audio(&priv->dec_state, &priv->frame); |
| |
| if (!sbc->data) { |
| sbc->size = samples * priv->frame.channels * 2; |
| sbc->data = malloc(sbc->size); |
| } |
| |
| if (sbc->size < samples * priv->frame.channels * 2) { |
| sbc->size = samples * priv->frame.channels * 2; |
| sbc->data = realloc(sbc->data, sbc->size); |
| } |
| |
| if (!sbc->data) { |
| sbc->size = 0; |
| return -ENOMEM; |
| } |
| |
| ptr = sbc->data; |
| |
| 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 (sbc->swap) { |
| *ptr++ = (s & 0xff00) >> 8; |
| *ptr++ = (s & 0x00ff); |
| } else { |
| *ptr++ = (s & 0x00ff); |
| *ptr++ = (s & 0xff00) >> 8; |
| } |
| } |
| } |
| |
| sbc->len = samples * priv->frame.channels * 2; |
| |
| return framelen; |
| } |
| |
| int sbc_encode(sbc_t *sbc, void *data, int count) |
| { |
| struct sbc_priv *priv; |
| char *ptr; |
| int i, ch, framelen, samples; |
| |
| if (!sbc) |
| return -EIO; |
| |
| priv = sbc->priv; |
| |
| if (!priv->init) { |
| priv->frame.sampling_frequency = sbc->rate; |
| priv->frame.channels = sbc->channels; |
| |
| if (sbc->channels > 1) { |
| if (sbc->joint) |
| priv->frame.channel_mode = JOINT_STEREO; |
| else |
| priv->frame.channel_mode = STEREO; |
| } else |
| priv->frame.channel_mode = MONO; |
| |
| priv->frame.allocation_method = sbc->allocation; |
| priv->frame.subbands = sbc->subbands; |
| priv->frame.blocks = sbc->blocks; |
| priv->frame.bitpool = sbc->bitpool; |
| |
| sbc_encoder_init(&priv->enc_state, &priv->frame); |
| priv->init = 1; |
| } |
| |
| /* input must be large enough to encode a complete frame */ |
| if (count < priv->frame.subbands * priv->frame.blocks * sbc->channels * 2) |
| return 0; |
| |
| ptr = data; |
| |
| for (i = 0; i < priv->frame.subbands * priv->frame.blocks; i++) { |
| for (ch = 0; ch < sbc->channels; ch++) { |
| int16_t s; |
| |
| if (sbc->swap) |
| 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); |
| |
| if (!sbc->data) { |
| sbc->size = 1024; |
| sbc->data = malloc(sbc->size); |
| } |
| |
| if (!sbc->data) { |
| sbc->size = 0; |
| return -ENOMEM; |
| } |
| |
| framelen = sbc_pack_frame(sbc->data, &priv->frame, sbc->size); |
| |
| sbc->len = framelen; |
| |
| sbc->duration = (1000000 * priv->frame.subbands * priv->frame.blocks) / sbc->rate; |
| |
| return samples * sbc->channels * 2; |
| } |
| |
| void sbc_finish(sbc_t *sbc) |
| { |
| if (!sbc) |
| return; |
| |
| if (sbc->data) |
| free(sbc->data); |
| |
| if (sbc->priv) |
| free(sbc->priv); |
| |
| memset(sbc, 0, sizeof(sbc_t)); |
| } |