diff options
Diffstat (limited to 'alsa/sbc.c')
| -rw-r--r-- | alsa/sbc.c | 1368 |
1 files changed, 0 insertions, 1368 deletions
diff --git a/alsa/sbc.c b/alsa/sbc.c deleted file mode 100644 index c32665be..00000000 --- a/alsa/sbc.c +++ /dev/null @@ -1,1368 +0,0 @@ -/* - * - * Bluetooth low-complexity, subband codec (SBC) library - * - * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org> - * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch> - * - * - * 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 - * - */ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif - -#include <errno.h> -#include <malloc.h> -#include <string.h> -#include <sys/types.h> - -#include "sbc.h" - -/* A2DP specification: Appendix B, page 69 */ -static const int sbc_offset4[4][4] = { - { -1, 0, 0, 0 }, - { -2, 0, 0, 1 }, - { -2, 0, 0, 1 }, - { -2, 0, 0, 1 } -}; - -/* A2DP specification: Appendix B, page 69 */ -static const int sbc_offset8[4][8] = { - { -2, 0, 0, 0, 0, 0, 0, 1 }, - { -3, 0, 0, 0, 0, 0, 1, 2 }, - { -4, 0, 0, 0, 0, 0, 1, 2 }, - { -4, 0, 0, 0, 0, 0, 1, 2 } -}; - -/* A2DP specification: Appendix B, page 70 */ -static const float sbc_proto_4_40[40] = { - 0.00000000E+00, 5.36548976E-04, 1.49188357E-03, 2.73370904E-03, - 3.83720193E-03, 3.89205149E-03, 1.86581691E-03, -3.06012286E-03, - 1.09137620E-02, 2.04385087E-02, 2.88757392E-02, 3.21939290E-02, - 2.58767811E-02, 6.13245186E-03, -2.88217274E-02, -7.76463494E-02, - 1.35593274E-01, 1.94987841E-01, 2.46636662E-01, 2.81828203E-01, - 2.94315332E-01, 2.81828203E-01, 2.46636662E-01, 1.94987841E-01, - -1.35593274E-01, -7.76463494E-02, -2.88217274E-02, 6.13245186E-03, - 2.58767811E-02, 3.21939290E-02, 2.88757392E-02, 2.04385087E-02, - -1.09137620E-02, -3.06012286E-03, 1.86581691E-03, 3.89205149E-03, - 3.83720193E-03, 2.73370904E-03, 1.49188357E-03, 5.36548976E-04 -}; - -/* A2DP specification: Appendix B, page 70 */ -static const float sbc_proto_8_80[80] = { - 0.00000000E+00, 1.56575398E-04, 3.43256425E-04, 5.54620202E-04, - 8.23919506E-04, 1.13992507E-03, 1.47640169E-03, 1.78371725E-03, - 2.01182542E-03, 2.10371989E-03, 1.99454554E-03, 1.61656283E-03, - 9.02154502E-04, -1.78805361E-04, -1.64973098E-03, -3.49717454E-03, - 5.65949473E-03, 8.02941163E-03, 1.04584443E-02, 1.27472335E-02, - 1.46525263E-02, 1.59045603E-02, 1.62208471E-02, 1.53184106E-02, - 1.29371806E-02, 8.85757540E-03, 2.92408442E-03, -4.91578024E-03, - -1.46404076E-02, -2.61098752E-02, -3.90751381E-02, -5.31873032E-02, - 6.79989431E-02, 8.29847578E-02, 9.75753918E-02, 1.11196689E-01, - 1.23264548E-01, 1.33264415E-01, 1.40753505E-01, 1.45389847E-01, - 1.46955068E-01, 1.45389847E-01, 1.40753505E-01, 1.33264415E-01, - 1.23264548E-01, 1.11196689E-01, 9.75753918E-02, 8.29847578E-02, - -6.79989431E-02, -5.31873032E-02, -3.90751381E-02, -2.61098752E-02, - -1.46404076E-02, -4.91578024E-03, 2.92408442E-03, 8.85757540E-03, - 1.29371806E-02, 1.53184106E-02, 1.62208471E-02, 1.59045603E-02, - 1.46525263E-02, 1.27472335E-02, 1.04584443E-02, 8.02941163E-03, - -5.65949473E-03, -3.49717454E-03, -1.64973098E-03, -1.78805361E-04, - 9.02154502E-04, 1.61656283E-03, 1.99454554E-03, 2.10371989E-03, - 2.01182542E-03, 1.78371725E-03, 1.47640169E-03, 1.13992507E-03, - 8.23919506E-04, 5.54620202E-04, 3.43256425E-04, 1.56575398E-04 -}; - -/* Precomputed: synmatrix4[k][i] = cos( (i+0.5) * (k+2.0) * pi/4.0 ) */ -static const float synmatrix4[8][4] = { - { 0.707106781186548, -0.707106781186547, -0.707106781186548, 0.707106781186547 }, - { 0.38268343236509, -0.923879532511287, 0.923879532511287, -0.38268343236509 }, - { 0, 0, 0, 0 }, - { -0.38268343236509, 0.923879532511287, -0.923879532511287, 0.382683432365091 }, - { -0.707106781186547, 0.707106781186548, 0.707106781186547, -0.707106781186547 }, - { -0.923879532511287, -0.38268343236509, 0.382683432365091, 0.923879532511288 }, - { -1, -1, -1, -1 }, - { -0.923879532511287, -0.382683432365091, 0.38268343236509, 0.923879532511287 } -}; - -/* Precomputed: synmatrix8[k][i] = cos( (i+0.5) * (k+4.0) * pi/8.0 ) */ -static const float synmatrix8[16][8] = { - { 0.707106781186548, -0.707106781186547, -0.707106781186548, 0.707106781186547, - 0.707106781186548, -0.707106781186547, -0.707106781186547, 0.707106781186547 }, - { 0.555570233019602, -0.98078528040323, 0.195090322016128, 0.831469612302545, - -0.831469612302545, -0.195090322016128, 0.980785280403231, -0.555570233019602 }, - { 0.38268343236509, -0.923879532511287, 0.923879532511287, -0.38268343236509, - -0.382683432365091, 0.923879532511287, -0.923879532511286, 0.38268343236509 }, - { 0.195090322016128, -0.555570233019602, 0.831469612302545, -0.980785280403231, - 0.98078528040323, -0.831469612302545, 0.555570233019602, -0.195090322016129 }, - { 0, 0, 0, 0, - 0, 0, 0, 0 }, - { -0.195090322016128, 0.555570233019602, -0.831469612302545, 0.98078528040323, - -0.980785280403231, 0.831469612302545, -0.555570233019603, 0.19509032201613 }, - { -0.38268343236509, 0.923879532511287, -0.923879532511287, 0.382683432365091, - 0.38268343236509, -0.923879532511287, 0.923879532511288, -0.382683432365091 }, - { -0.555570233019602, 0.98078528040323, -0.195090322016128, -0.831469612302545, - 0.831469612302545, 0.195090322016128, -0.98078528040323, 0.555570233019606 }, - { -0.707106781186547, 0.707106781186548, 0.707106781186547, -0.707106781186547, - -0.707106781186546, 0.707106781186548, 0.707106781186546, -0.707106781186548 }, - { -0.831469612302545, 0.195090322016129, 0.980785280403231, 0.555570233019602, - -0.555570233019603, -0.98078528040323, -0.195090322016128, 0.831469612302547 }, - { -0.923879532511287, -0.38268343236509, 0.382683432365091, 0.923879532511288, - 0.923879532511287, 0.382683432365089, -0.382683432365091, -0.923879532511287 }, - { -0.98078528040323, -0.831469612302545, -0.555570233019602, -0.195090322016129, - 0.19509032201613, 0.555570233019606, 0.831469612302547, 0.980785280403231 }, - { -1, -1, -1, -1, - -1, -1, -1, -1 }, - { -0.98078528040323, -0.831469612302546, -0.555570233019603, -0.19509032201613, - 0.195090322016128, 0.555570233019604, 0.831469612302545, 0.98078528040323 }, - { -0.923879532511287, -0.382683432365091, 0.38268343236509, 0.923879532511287, - 0.923879532511288, 0.382683432365088, -0.382683432365089, -0.923879532511285 }, - { -0.831469612302545, 0.195090322016127, 0.98078528040323, 0.555570233019603, - -0.555570233019601, -0.98078528040323, -0.195090322016131, 0.831469612302545 } -}; - -/* Precomputed: anamatrix4[i][k] = cos( (i+0.5) * (k-2) * pi/4 ) */ -static const float anamatrix4[4][8] = { - { 0.707106781186548, 0.923879532511287, 1, 0.923879532511287, - 0.707106781186548, 0.38268343236509, 0, -0.38268343236509 }, - { -0.707106781186547, 0.38268343236509, 1, 0.38268343236509, - -0.707106781186547, -0.923879532511287, 0, 0.923879532511287 }, - { -0.707106781186548, -0.38268343236509, 1, -0.38268343236509, - -0.707106781186548, 0.923879532511287, 0, -0.923879532511287 }, - { 0.707106781186547, -0.923879532511287, 1, -0.923879532511287, - 0.707106781186547, -0.38268343236509, 0, 0.382683432365091 } -}; - -/* Precomputed: anamatrix8[i][k] = cos( (i+0.5) * (k-4) * pi/8) */ -static const float anamatrix8[8][16] = { - { 0.923879532511287, 0.98078528040323, 1, 0.98078528040323, - 0.923879532511287, 0.831469612302545, 0.707106781186548, 0.555570233019602, - 0.38268343236509, 0.195090322016128, 0, -0.195090322016128, - -0.38268343236509, -0.555570233019602, -0.707106781186547, -0.831469612302545 }, - { 0.38268343236509, 0.831469612302545, 1, 0.831469612302545, - 0.38268343236509, -0.195090322016128, -0.707106781186547, -0.98078528040323, - -0.923879532511287, -0.555570233019602, 0, 0.555570233019602, - 0.923879532511287, 0.98078528040323, 0.707106781186548, 0.195090322016129 }, - { -0.38268343236509, 0.555570233019602, 1, 0.555570233019602, - -0.38268343236509, -0.98078528040323, -0.707106781186548, 0.195090322016128, - 0.923879532511287, 0.831469612302545, 0, -0.831469612302545, - -0.923879532511287, -0.195090322016128, 0.707106781186547, 0.980785280403231 }, - { -0.923879532511287, 0.195090322016128, 1, 0.195090322016128, - -0.923879532511287, -0.555570233019602, 0.707106781186547, 0.831469612302545, - -0.38268343236509, -0.980785280403231, 0, 0.98078528040323, - 0.382683432365091, -0.831469612302545, -0.707106781186547, 0.555570233019602 }, - { -0.923879532511287, -0.195090322016128, 1, -0.195090322016128, - -0.923879532511287, 0.555570233019602, 0.707106781186548, -0.831469612302545, - -0.382683432365091, 0.98078528040323, 0, -0.980785280403231, - 0.38268343236509, 0.831469612302545, -0.707106781186546, -0.555570233019603 }, - { -0.38268343236509, -0.555570233019602, 1, -0.555570233019602, - -0.38268343236509, 0.98078528040323, -0.707106781186547, -0.195090322016128, - 0.923879532511287, -0.831469612302545, 0, 0.831469612302545, - -0.923879532511287, 0.195090322016128, 0.707106781186548, -0.98078528040323 }, - { 0.38268343236509, -0.831469612302545, 1, -0.831469612302545, - 0.38268343236509, 0.195090322016129, -0.707106781186547, 0.980785280403231, - -0.923879532511286, 0.555570233019602, 0, -0.555570233019603, - 0.923879532511288, -0.98078528040323, 0.707106781186546, -0.195090322016128 }, - { 0.923879532511287, -0.98078528040323, 1, -0.98078528040323, - 0.923879532511287, -0.831469612302545, 0.707106781186547, -0.555570233019602, - 0.38268343236509, -0.195090322016129, 0, 0.19509032201613, - -0.382683432365091, 0.555570233019606, -0.707106781186548, 0.831469612302547 } -}; - -#define fabs(x) ((x) < 0 ? (-x) : (x)) - -#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 { - double sampling_frequency; /* in kHz */ - u_int8_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; - u_int8_t channels; - enum { - LOUDNESS = SBC_AM_LOUDNESS, - SNR = SBC_AM_SNR - } allocation_method; - u_int8_t subbands; - u_int8_t bitpool; - u_int8_t join; /* bit number x set means joint stereo has been used in subband x */ - u_int8_t scale_factor[2][8]; /* only the lower 4 bits of every element are to be used */ - u_int16_t audio_sample[16][2][8]; /* raw integer subband samples in the frame */ - double sb_sample[16][2][8]; /* modified subband samples */ - double pcm_sample[2][16*8]; /* original pcm audio samples */ -}; - -struct sbc_decoder_state { - int subbands; - float S[2][8]; /* Subband samples */ - float X[2][8]; /* Audio samples */ - float V[2][160], U[2][80], W[2][80]; /* Vectors */ -}; - -struct sbc_encoder_state { - int subbands; - float S[2][8]; /* Subband samples */ - float X[2][80], Y[2][16], Z[2][80]; /* Vectors */ -}; - -/* - * Calculates the CRC-8 of the first len bits in data - */ -static const u_int8_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 u_int8_t sbc_crc8(const u_int8_t * data, size_t len) -{ - u_int8_t crc = 0x0f; - size_t i; - u_int8_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], u_int8_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 u_int8_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 */ - u_int8_t crc_header[11] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; - int crc_pos = 0; - - u_int8_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 */ - - double scalefactor[2][8]; /* derived from frame->scale_factors */ - - 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 = 16; - break; - case SBC_FS_32: - frame->sampling_frequency = 32; - break; - case SBC_FS_44: - frame->sampling_frequency = 44.1; - break; - case SBC_FS_48: - frame->sampling_frequency = 48; - 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; - } else { - 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; - } else { - 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 / 8] >> (4 - (consumed % 8))) & 0x0F; - crc_header[crc_pos / 8] |= frame->scale_factor[ch][sb] << (4 - (crc_pos % 8)); - - 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) { - for (bit = 0; bit < bits[ch][sb]; bit++) { - int b; /* A bit */ - if (consumed > len * 8) { - return -1; - } - - b = (data[consumed / 8] >> (7 - (consumed % 8))) & 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; - scalefactor[ch][sb] = 2 << frame->scale_factor[ch][sb]; - } - } - - 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] = - scalefactor[ch][sb] * ((frame->audio_sample[blk][ch][sb] * 2.0 + 1.0) / - levels[ch][sb] - 1.0); - } 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)) { - frame->sb_sample[blk][0][sb] = - frame->sb_sample[blk][0][sb] + frame->sb_sample[blk][1][sb]; - frame->sb_sample[blk][1][sb] = - frame->sb_sample[blk][0][sb] - 2 * frame->sb_sample[blk][1][sb]; - } - } - } - } - - if (consumed % 8 != 0) - consumed += 8 - (consumed % 8); - - return consumed / 8; -} - -static void sbc_decoder_init(struct sbc_decoder_state *state, const struct sbc_frame *frame) -{ - memset(&state->S, 0, sizeof(state->S)); - memset(&state->X, 0, sizeof(state->X)); - memset(&state->V, 0, sizeof(state->V)); - memset(&state->U, 0, sizeof(state->U)); - memset(&state->W, 0, sizeof(state->W)); - state->subbands = frame->subbands; -} - -static inline void sbc_synthesize_four(struct sbc_decoder_state *state, - struct sbc_frame *frame, int ch, int blk) -{ - int i, j, k; - - /* Input 4 New Subband Samples */ - for (i = 0; i < 4; i++) - state->S[ch][i] = frame->sb_sample[blk][ch][i]; - - /* Shifting */ - for (i = 79; i >= 8; i--) - state->V[ch][i] = state->V[ch][i - 8]; - - /* Matrixing */ - for (k = 0; k < 8; k++) { - state->V[ch][k] = 0; - for (i = 0; i < 4; i++) - state->V[ch][k] += synmatrix4[k][i] * state->S[ch][i]; - } - - /* Build a 40 values vector U */ - for (i = 0; i <= 4; i++) { - for (j = 0; j < 4; j++) { - state->U[ch][i * 8 + j] = state->V[ch][i * 16 + j]; - state->U[ch][i * 8 + j + 4] = state->V[ch][i * 16 + j + 12]; - } - } - - /* Window by 40 coefficients */ - for (i = 0; i < 40; i++) - state->W[ch][i] = state->U[ch][i] * sbc_proto_4_40[i] * (-4); - - /* Calculate 4 audio samples */ - for (j = 0; j < 4; j++) { - state->X[ch][j] = 0; - for (i = 0; i < 10; i++) - state->X[ch][j] += state->W[ch][j + 4 * i]; - } - - /* Output 4 reconstructed Audio Samples */ - for (i = 0; i < 4; i++) - frame->pcm_sample[ch][blk * 4 + i] = state->X[ch][i]; -} - -static inline void sbc_synthesize_eight(struct sbc_decoder_state *state, - struct sbc_frame *frame, int ch, int blk) -{ - int i, j, k; - - /* Input 8 New Subband Samples */ - for (i = 0; i < 8; i++) - state->S[ch][i] = frame->sb_sample[blk][ch][i]; - - /* Shifting */ - for (i = 159; i >= 16; i--) - state->V[ch][i] = state->V[ch][i - 16]; - - /* Matrixing */ - for (k = 0; k < 16; k++) { - state->V[ch][k] = 0; - for (i = 0; i < 8; i++) { - state->V[ch][k] += synmatrix8[k][i] * state->S[ch][i]; - } - } - - /* Build a 80 values vector U */ - for (i = 0; i <= 4; i++) { - for (j = 0; j < 8; j++) { - state->U[ch][i * 16 + j] = state->V[ch][i * 32 + j]; - state->U[ch][i * 16 + j + 8] = state->V[ch][i * 32 + j + 24]; - } - } - - /* Window by 80 coefficients */ - for (i = 0; i < 80; i++) - state->W[ch][i] = state->U[ch][i] * sbc_proto_8_80[i] * (-4); - - /* Calculate 8 audio samples */ - for (j = 0; j < 8; j++) { - state->X[ch][j] = 0; - for (i = 0; i < 10; i++) - state->X[ch][j] += state->W[ch][j + 8 * i]; - } - - /* Ouput 8 reconstructed Audio Samples */ - for (i = 0; i < 8; i++) - frame->pcm_sample[ch][blk * 8 + i] = state->X[ch][i]; -} - -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++) { - memset(frame->pcm_sample[ch], 0, - sizeof(frame->pcm_sample[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++) { - memset(frame->pcm_sample[ch], 0, - sizeof(frame->pcm_sample[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->S, 0, sizeof(state->S)); - memset(&state->X, 0, sizeof(state->X)); - memset(&state->Y, 0, sizeof(state->Y)); - memset(&state->Z, 0, sizeof(state->Z)); - state->subbands = frame->subbands; -} - -static inline void sbc_analyze_four(struct sbc_encoder_state *state, - struct sbc_frame *frame, int ch, int blk) -{ - int i, k; - - /* 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)]; - - /* Windowing by 40 coefficients */ - for (i = 0; i < 40; i++) - state->Z[ch][i] = sbc_proto_4_40[i] * state->X[ch][i]; - - /* Partial calculation */ - for (i = 0; i < 8; i++) { - state->Y[ch][i] = 0; - for (k = 0; k < 5; k++) - state->Y[ch][i] += state->Z[ch][i + k * 8]; - } - - /* Calculate 4 subband samples by Matrixing */ - for (i = 0; i < 4; i++) { - state->S[ch][i] = 0; - for (k = 0; k < 8; k++) - state->S[ch][i] += anamatrix4[i][k] * state->Y[ch][k]; - } - - /* Output 4 Subband Samples */ - for (i = 0; i < 4; i++) - frame->sb_sample[blk][ch][i] = state->S[ch][i]; -} - -static inline void sbc_analyze_eight(struct sbc_encoder_state *state, - struct sbc_frame *frame, int ch, int blk) -{ - int i, k; - - /* 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)]; - - /* Windowing by 80 coefficients */ - for (i = 0; i < 80; i++) - state->Z[ch][i] = sbc_proto_8_80[i] * state->X[ch][i]; - - /* Partial calculation */ - for (i = 0; i < 16; i++) { - state->Y[ch][i] = 0; - for (k = 0; k < 5; k++) - state->Y[ch][i] += state->Z[ch][i + k * 16]; - } - - /* Calculate 8 subband samples by Matrixing */ - for (i = 0; i < 8; i++) { - state->S[ch][i] = 0; - for (k = 0; k < 16; k++) - state->S[ch][i] += anamatrix8[i][k] * state->Y[ch][k]; - } - - /* Output 8 Subband Samples */ - for (i = 0; i < 8; i++) - frame->sb_sample[blk][ch][i] = state->S[ch][i]; -} - -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++) { - memset(frame->sb_sample[blk][ch], 0, - sizeof(frame->sb_sample[blk][ch])); - 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++) { - memset(frame->sb_sample[blk][ch], 0, - sizeof(frame->sb_sample[blk][ch])); - 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(u_int8_t * data, struct sbc_frame *frame, size_t len) -{ - int produced; - /* Will copy the header parts for CRC-8 calculation here */ - u_int8_t crc_header[11] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; - int crc_pos = 0; - - u_int8_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 */ - - double 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 == 16) { - data[1] |= (SBC_FS_16 & 0x03) << 6; - sf = SBC_FS_16; - } else if (frame->sampling_frequency == 32) { - data[1] |= (SBC_FS_32 & 0x03) << 6; - sf = SBC_FS_32; - } else if (frame->sampling_frequency == 44.1) { - data[1] |= (SBC_FS_44 & 0x03) << 6; - sf = SBC_FS_44; - } else if (frame->sampling_frequency == 48) { - 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[blk][ch][sb])) { - frame->scale_factor[ch][sb]++; - scalefactor[ch][sb] *= 2; - } - } - } - } - - if (frame->channel_mode == JOINT_STEREO) { - float 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[blk][0][sb] - + frame->sb_sample[blk][1][sb]) / 2; - sb_sample_j[blk][1][sb] = (frame->sb_sample[blk][0][sb] - - frame->sb_sample[blk][1][sb]) / 2; - } - } - - /* 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[blk][0][sb] = sb_sample_j[blk][0][sb]; - frame->sb_sample[blk][1][sb] = sb_sample_j[blk][1][sb]; - } - } - } - - if (len * 8 < produced + frame->subbands) { - return -1; - } else { - 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; - } else { - 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] = - (u_int16_t) (((frame->sb_sample[blk][ch][sb] / scalefactor[ch][sb] + - 1.0) * levels[ch][sb]) / 2.0); - } 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->subbands = 8; - sbc->blocks = 16; - sbc->bitpool = 32; - - return 0; -} - -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 * 1000; - 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 = (int16_t)(priv->frame.pcm_sample[ch][i]); - *ptr++ = (s & 0xff00) >> 8; - *ptr++ = (s & 0x00ff); - } - } - - sbc->len = samples * priv->frame.channels * 2; - - sbc->duration = (1000000 * priv->frame.subbands * priv->frame.blocks) / sbc->rate; - - 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 = ((double) sbc->rate) / 1000; - priv->frame.channels = sbc->channels; - - if (sbc->channels > 1) - priv->frame.channel_mode = STEREO; - else - priv->frame.channel_mode = MONO; - - priv->frame.allocation_method = SNR; - 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; - } - - ptr = data; - - for (i = 0; i < priv->frame.subbands * priv->frame.blocks; i++) { - for (ch = 0; ch < sbc->channels; ch++) { - //int16_t s = (ptr[0] & 0xff) << 8 | (ptr[1] & 0xff); - int16_t s = (ptr[1] & 0xff) << 8 | (ptr[2] & 0xff); - ptr += 2; - priv->frame.pcm_sample[ch][i] = ((double) 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)); -} |