网站自定义模块,网站可以自己做,免费 wordpress主题,中企动力做网站5个月了1、README
前言
本demo是将使用了开源项目EasyAACEncoder里的src/g726.cpp(demo中的已重命名为g726.c)和src/g726.h将16位小字节序的pcm数据和g726进行相互转换。 注#xff1a;相关测试文件已存放在demo的audio目录下#xff0c;目前发现pcm转换得到的g726文件用软件Audac…1、README
前言
本demo是将使用了开源项目EasyAACEncoder里的src/g726.cpp(demo中的已重命名为g726.c)和src/g726.h将16位小字节序的pcm数据和g726进行相互转换。 注相关测试文件已存放在demo的audio目录下目前发现pcm转换得到的g726文件用软件Audacity播放不正常没找到g726所以选的VOX ADPCM而将所得到的g726再转换回pcm却播放正常网上说需要支持g726解码的播放器才能播放用ffmpeg播放也出错所以看到本注释时的g726都是播放不了的。 a. 编译
$ make clean make # 或者make DEBUG1打开调试打印信息又或者指定CCyour-crosscompile-gcc进行编译交叉编译b. 使用
$ ./pcm_g726_convert
Usage:./pcm_g726_convert -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 16000 -o out_8khz_16kbps.g726./pcm_g726_convert -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 24000 -o out_8khz_24kbps.g726./pcm_g726_convert -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 32000 -o out_8khz_32kbps.g726./pcm_g726_convert -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 40000 -o out_8khz_40kbps.g726./pcm_g726_convert -t g726_2_pcm -i ./audio/test_8khz_16kbps.g726 -r 16000 -o out_8khz_16bit_mono_128kbps-1.pcm./pcm_g726_convert -t g726_2_pcm -i ./audio/test_8khz_24kbps.g726 -r 24000 -o out_8khz_16bit_mono_128kbps-2.pcm./pcm_g726_convert -t g726_2_pcm -i ./audio/test_8khz_32kbps.g726 -r 32000 -o out_8khz_16bit_mono_128kbps-3.pcm./pcm_g726_convert -t g726_2_pcm -i ./audio/test_8khz_40kbps.g726 -r 40000 -o out_8khz_16bit_mono_128kbps-4.pcmc. 参考文章 音频采样及编解码——LPCM 、ADPCM、G711、G726、AAC_夜风的博客-CSDN博客_adpcm g726转pcm_ybn187的专栏-CSDN博客_g726转pcm g726算法的一些总结_那年晴天的博客-CSDN博客
d. demo目录架构
$ tree
.
├── audio
│ ├── test_8khz_16bit_mono_128kbps.pcm
│ ├── test_8khz_16kbps.g726
│ ├── test_8khz_24kbps.g726
│ ├── test_8khz_32kbps.g726
│ └── test_8khz_40kbps.g726
├── docs
│ ├── g726算法的一些总结_那年晴天的博客-CSDN博客.mhtml
│ ├── g726转pcm_ybn187的专栏-CSDN博客_g726转pcm.mhtml
│ └── 音频采样及编解码——LPCM 、ADPCM、G711、G726、AAC_夜风的博客-CSDN博客_adpcm.mhtml
├── g726.c
├── g726.h
├── main.c
├── Makefile
└── README.md2、主要代码片段
g726.c
/*Copyright (c) 2013-2016 EasyDarwin.ORG. All rights reserved.Github: https://github.com/EasyDarwinWEChat: EasyDarwinWebsite: http://www.easydarwin.org
*/#include stdio.h
#include math.h
#include stdlib.h
#include g726.hstatic const int qtab_726_16[1]
{261
};static const int qtab_726_24[3]
{8, 218, 331
};static const int qtab_726_32[7]
{-124, 80, 178, 246, 300, 349, 400
};static const int qtab_726_40[15]
{-122, -16, 68, 139, 198, 250, 298, 339,378, 413, 445, 475, 502, 528, 553
};static __inline int top_bit(unsigned int bits)
{
#if defined(__i386__) || defined(__x86_64__)int res;__asm__ ( xorl %[res],%[res];\n decl %[res];\n bsrl %[bits],%[res]\n: [res] r (res): [bits] rm (bits));return res;
#elif defined(__ppc__) || defined(__powerpc__)int res;__asm__ (cntlzw %[res],%[bits];\n: [res] r (res): [bits] r (bits));return 31 - res;
#elif defined(_M_IX86) // Visual Studio x86__asm{xor eax, eaxdec eaxbsr eax, bits}
#elseint res;if (bits 0)return -1;res 0;if (bits 0xFFFF0000){bits 0xFFFF0000;res 16;}if (bits 0xFF00FF00){bits 0xFF00FF00;res 8;}if (bits 0xF0F0F0F0){bits 0xF0F0F0F0;res 4;}if (bits 0xCCCCCCCC){bits 0xCCCCCCCC;res 2;}if (bits 0xAAAAAAAA){bits 0xAAAAAAAA;res 1;}return res;
#endif
}static bitstream_state_t *bitstream_init(bitstream_state_t *s)
{if (s NULL)return NULL;s-bitstream 0;s-residue 0;return s;
}/** Given a raw sample, d, of the difference signal and a* quantization step size scale factor, y, this routine returns the* ADPCM codeword to which that sample gets quantized. The step* size scale factor division operation is done in the log base 2 domain* as a subtraction.*/
static short quantize(int d, /* Raw difference signal sample */int y, /* Step size multiplier */const int table[], /* quantization table */int quantizer_states) /* table size of short integers */
{short dqm; /* Magnitude of d */short exp; /* Integer part of base 2 log of d */short mant; /* Fractional part of base 2 log */short dl; /* Log of magnitude of d */short dln; /* Step size scale factor normalized log */int i;int size;/** LOG** Compute base 2 log of d, and store in dl.*/dqm (short) abs(d);exp (short) (top_bit(dqm 1) 1);/* Fractional portion. */mant ((dqm 7) exp) 0x7F;dl (exp 7) mant;/** SUBTB** Divide by step size multiplier.*/dln dl - (short) (y 2);/** QUAN** Search for codword i for dln.*/size (quantizer_states - 1) 1;for (i 0; i size; i){if (dln table[i])break;}if (d 0){/* Take 1s complement of i */return (short) ((size 1) 1 - i);}if (i 0 (quantizer_states 1)){/* Zero is only valid if there are an even number of states, sotake the 1s complement if the code is zero. */return (short) quantizer_states;}return (short) i;
}
/*- End of function --------------------------------------------------------*//*
* returns the integer product of the 14-bit integer an and
* floating point representation (4-bit exponent, 6-bit mantessa) srn.
*/
static short fmult(short an, short srn)
{short anmag;short anexp;short anmant;short wanexp;short wanmant;short retval;anmag (an 0) ? an : ((-an) 0x1FFF);anexp (short) (top_bit(anmag) - 5);anmant (anmag 0) ? 32 : (anexp 0) ? (anmag anexp) : (anmag -anexp);wanexp anexp ((srn 6) 0xF) - 13;wanmant (anmant*(srn 0x3F) 0x30) 4;retval (wanexp 0) ? ((wanmant wanexp) 0x7FFF) : (wanmant -wanexp);return (((an ^ srn) 0) ? -retval : retval);
}/*
* Compute the estimated signal from the 6-zero predictor.
*/
static __inline short predictor_zero(g726_state_t *s)
{int i;int sezi;sezi fmult(s-b[0] 2, s-dq[0]);/* ACCUM */for (i 1; i 6; i)sezi fmult(s-b[i] 2, s-dq[i]);return (short) sezi;
}
/*- End of function --------------------------------------------------------*//*
* Computes the estimated signal from the 2-pole predictor.
*/
static __inline short predictor_pole(g726_state_t *s)
{return (fmult(s-a[1] 2, s-sr[1]) fmult(s-a[0] 2, s-sr[0]));
}/*
* Computes the quantization step size of the adaptive quantizer.
*/
static int step_size(g726_state_t *s)
{int y;int dif;int al;if (s-ap 256)return s-yu;y s-yl 6;dif s-yu - y;al s-ap 2;if (dif 0)y (dif*al) 6;else if (dif 0)y (dif*al 0x3F) 6;return y;
}
/*- End of function --------------------------------------------------------*//*
* Returns reconstructed difference signal dq obtained from
* codeword i and quantization step size scale factor y.
* Multiplication is performed in log base 2 domain as addition.
*/
static short reconstruct(int sign, /* 0 for non-negative value */int dqln, /* G.72x codeword */int y) /* Step size multiplier */
{short dql; /* Log of dq magnitude */short dex; /* Integer part of log */short dqt;short dq; /* Reconstructed difference signal sample */dql (short) (dqln (y 2)); /* ADDA */if (dql 0)return ((sign) ? -0x8000 : 0);/* ANTILOG */dex (dql 7) 15;dqt 128 (dql 127);dq (dqt 7) (14 - dex);return ((sign) ? (dq - 0x8000) : dq);
}
/*- End of function --------------------------------------------------------*//*
* updates the state variables for each output code
*/
static void update(g726_state_t *s,int y, /* quantizer step size */int wi, /* scale factor multiplier */int fi, /* for long/short term energies */int dq, /* quantized prediction difference */int sr, /* reconstructed signal */int dqsez) /* difference from 2-pole predictor */
{short mag;short exp;short a2p; /* LIMC */short a1ul; /* UPA1 */short pks1; /* UPA2 */short fa1;short ylint;short dqthr;short ylfrac;short thr;short pk0;int i;int tr;a2p 0;/* Needed in updating predictor poles */pk0 (dqsez 0) ? 1 : 0;/* prediction difference magnitude */mag (short) (dq 0x7FFF);/* TRANS */ylint (short) (s-yl 15); /* exponent part of yl */ylfrac (short) ((s-yl 10) 0x1F); /* fractional part of yl *//* Limit threshold to 31 10 */thr (ylint 9) ? (31 10) : ((32 ylfrac) ylint);dqthr (thr (thr 1)) 1; /* dqthr 0.75 * thr */if (!s-td) /* signal supposed voice */tr 0;else if (mag dqthr) /* supposed data, but small mag */tr 0; /* treated as voice */else /* signal is data (modem) */tr 1;/** Quantizer scale factor adaptation.*//* FUNCTW FILTD DELAY *//* update non-steady state step size multiplier */s-yu (short) (y ((wi - y) 5));/* LIMB */if (s-yu 544)s-yu 544;else if (s-yu 5120)s-yu 5120;/* FILTE DELAY *//* update steady state step size multiplier */s-yl s-yu ((-s-yl) 6);/** Adaptive predictor coefficients.*/if (tr){/* Reset the as and bs for a modem signal */s-a[0] 0;s-a[1] 0;s-b[0] 0;s-b[1] 0;s-b[2] 0;s-b[3] 0;s-b[4] 0;s-b[5] 0;}else{/* Update the as and bs *//* UPA2 */pks1 pk0 ^ s-pk[0];/* Update predictor pole a[1] */a2p s-a[1] - (s-a[1] 7);if (dqsez ! 0){fa1 (pks1) ? s-a[0] : -s-a[0];/* a2p function of fa1 */if (fa1 -8191)a2p - 0x100;else if (fa1 8191)a2p 0xFF;elsea2p fa1 5;if (pk0 ^ s-pk[1]){/* LIMC */if (a2p -12160)a2p -12288;else if (a2p 12416)a2p 12288;elsea2p - 0x80;}else if (a2p -12416)a2p -12288;else if (a2p 12160)a2p 12288;elsea2p 0x80;}/* TRIGB DELAY */s-a[1] a2p;/* UPA1 *//* Update predictor pole a[0] */s-a[0] - s-a[0] 8;if (dqsez ! 0){if (pks1 0)s-a[0] 192;elses-a[0] - 192;}/* LIMD */a1ul 15360 - a2p;if (s-a[0] -a1ul)s-a[0] -a1ul;else if (s-a[0] a1ul)s-a[0] a1ul;/* UPB : update predictor zeros b[6] */for (i 0; i 6; i){/* Distinguish 40Kbps mode from the others */s-b[i] - s-b[i] ((s-bits_per_sample 5) ? 9 : 8);if (dq 0x7FFF){/* XOR */if ((dq ^ s-dq[i]) 0)s-b[i] 128;elses-b[i] - 128;}}}for (i 5; i 0; i--)s-dq[i] s-dq[i - 1];/* FLOAT A : convert dq[0] to 4-bit exp, 6-bit mantissa f.p. */if (mag 0){s-dq[0] (dq 0) ? 0x20 : 0xFC20;}else{exp (short) (top_bit(mag) 1);s-dq[0] (dq 0)? ((exp 6) ((mag 6) exp)): ((exp 6) ((mag 6) exp) - 0x400);}s-sr[1] s-sr[0];/* FLOAT B : convert sr to 4-bit exp., 6-bit mantissa f.p. */if (sr 0){s-sr[0] 0x20;}else if (sr 0){exp (short) (top_bit(sr) 1);s-sr[0] (short) ((exp 6) ((sr 6) exp));}else if (sr -32768){mag (short) -sr;exp (short) (top_bit(mag) 1);s-sr[0] (exp 6) ((mag 6) exp) - 0x400;}else{s-sr[0] (short) 0xFC20;}/* DELAY A */s-pk[1] s-pk[0];s-pk[0] pk0;/* TONE */if (tr) /* this sample has been treated as data */s-td 0; /* next one will be treated as voice */else if (a2p -11776) /* small sample-to-sample correlation */s-td 1; /* signal may be data */else /* signal is voice */s-td 0;/* Adaptation speed control. *//* FILTA */s-dms ((short) fi - s-dms) 5;/* FILTB */s-dml (((short) (fi 2) - s-dml) 7);if (tr)s-ap 256;else if (y 1536) /* SUBTC */s-ap (0x200 - s-ap) 4;else if (s-td)s-ap (0x200 - s-ap) 4;else if (abs((s-dms 2) - s-dml) (s-dml 3))s-ap (0x200 - s-ap) 4;elses-ap (-s-ap) 4;
}/*
* Decodes a 2-bit CCITT G.726_16 ADPCM code and returns
* the resulting 16-bit linear PCM, A-law or u-law sample value.
*/
static short g726_16_decoder(g726_state_t *s, unsigned char code)
{short sezi;short sei;short se;short sr;short dq;short dqsez;int y;/* Mask to get proper bits */code 0x03;sezi predictor_zero(s);sei sezi predictor_pole(s);y step_size(s);dq reconstruct(code 2, g726_16_dqlntab[code], y);/* Reconstruct the signal */se sei 1;sr (dq 0) ? (se - (dq 0x3FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_16_witab[code], g726_16_fitab[code], dq, sr, dqsez);return (sr 2);
}
/*- End of function --------------------------------------------------------*//** Encodes a linear PCM, A-law or u-law input sample and returns its 3-bit code.*/
static unsigned char g726_16_encoder(g726_state_t *s, short amp)
{int y;short sei;short sezi;short se;short d;short sr;short dqsez;short dq;short i;sezi predictor_zero(s);sei sezi predictor_pole(s);se sei 1;d amp - se;/* Quantize prediction difference */y step_size(s);i quantize(d, y, qtab_726_16, 4);dq reconstruct(i 2, g726_16_dqlntab[i], y);/* Reconstruct the signal */sr (dq 0) ? (se - (dq 0x3FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_16_witab[i], g726_16_fitab[i], dq, sr, dqsez);return (unsigned char) i;
}/*
* Decodes a 3-bit CCITT G.726_24 ADPCM code and returns
* the resulting 16-bit linear PCM, A-law or u-law sample value.
*/
static short g726_24_decoder(g726_state_t *s, unsigned char code)
{short sezi;short sei;short se;short sr;short dq;short dqsez;int y;/* Mask to get proper bits */code 0x07;sezi predictor_zero(s);sei sezi predictor_pole(s);y step_size(s);dq reconstruct(code 4, g726_24_dqlntab[code], y);/* Reconstruct the signal */se sei 1;sr (dq 0) ? (se - (dq 0x3FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_24_witab[code], g726_24_fitab[code], dq, sr, dqsez);return (sr 2);
}
/*- End of function --------------------------------------------------------*//** Encodes a linear PCM, A-law or u-law input sample and returns its 3-bit code.*/
static unsigned char g726_24_encoder(g726_state_t *s, short amp)
{short sei;short sezi;short se;short d;short sr;short dqsez;short dq;short i;int y;sezi predictor_zero(s);sei sezi predictor_pole(s);se sei 1;d amp - se;/* Quantize prediction difference */y step_size(s);i quantize(d, y, qtab_726_24, 7);dq reconstruct(i 4, g726_24_dqlntab[i], y);/* Reconstruct the signal */sr (dq 0) ? (se - (dq 0x3FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_24_witab[i], g726_24_fitab[i], dq, sr, dqsez);return (unsigned char) i;
}/*
* Decodes a 4-bit CCITT G.726_32 ADPCM code and returns
* the resulting 16-bit linear PCM, A-law or u-law sample value.
*/
static short g726_32_decoder(g726_state_t *s, unsigned char code)
{short sezi;short sei;short se;short sr;short dq;short dqsez;int y;/* Mask to get proper bits */code 0x0F;sezi predictor_zero(s);sei sezi predictor_pole(s);y step_size(s);dq reconstruct(code 8, g726_32_dqlntab[code], y);/* Reconstruct the signal */se sei 1;sr (dq 0) ? (se - (dq 0x3FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_32_witab[code], g726_32_fitab[code], dq, sr, dqsez);return (sr 2);
}
/*- End of function --------------------------------------------------------*//** Encodes a linear input sample and returns its 4-bit code.*/
static unsigned char g726_32_encoder(g726_state_t *s, short amp)
{short sei;short sezi;short se;short d;short sr;short dqsez;short dq;short i;int y;sezi predictor_zero(s);sei sezi predictor_pole(s);se sei 1;d amp - se;/* Quantize the prediction difference */y step_size(s);i quantize(d, y, qtab_726_32, 15);dq reconstruct(i 8, g726_32_dqlntab[i], y);/* Reconstruct the signal */sr (dq 0) ? (se - (dq 0x3FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_32_witab[i], g726_32_fitab[i], dq, sr, dqsez);return (unsigned char) i;
}/*
* Decodes a 5-bit CCITT G.726 40Kbps code and returns
* the resulting 16-bit linear PCM, A-law or u-law sample value.
*/
static short g726_40_decoder(g726_state_t *s, unsigned char code)
{short sezi;short sei;short se;short sr;short dq;short dqsez;int y;/* Mask to get proper bits */code 0x1F;sezi predictor_zero(s);sei sezi predictor_pole(s);y step_size(s);dq reconstruct(code 0x10, g726_40_dqlntab[code], y);/* Reconstruct the signal */se sei 1;sr (dq 0) ? (se - (dq 0x7FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_40_witab[code], g726_40_fitab[code], dq, sr, dqsez);return (sr 2);
}
/*- End of function --------------------------------------------------------*//** Encodes a 16-bit linear PCM, A-law or u-law input sample and retuens* the resulting 5-bit CCITT G.726 40Kbps code.*/
static unsigned char g726_40_encoder(g726_state_t *s, short amp)
{short sei;short sezi;short se;short d;short sr;short dqsez;short dq;short i;int y;sezi predictor_zero(s);sei sezi predictor_pole(s);se sei 1;d amp - se;/* Quantize prediction difference */y step_size(s);i quantize(d, y, qtab_726_40, 31);dq reconstruct(i 0x10, g726_40_dqlntab[i], y);/* Reconstruct the signal */sr (dq 0) ? (se - (dq 0x7FFF)) : (se dq);/* Pole prediction difference */dqsez sr (sezi 1) - se;update(s, y, g726_40_witab[i], g726_40_fitab[i], dq, sr, dqsez);return (unsigned char) i;
}g726_state_t *g726_init(g726_state_t *s, int bit_rate)
{int i;if (bit_rate ! 16000 bit_rate ! 24000 bit_rate ! 32000 bit_rate ! 40000)return NULL;s-yl 34816;s-yu 544;s-dms 0;s-dml 0;s-ap 0;s-rate bit_rate;for (i 0; i 2; i){s-a[i] 0;s-pk[i] 0;s-sr[i] 32;}for (i 0; i 6; i){s-b[i] 0;s-dq[i] 32;}s-td 0;switch (bit_rate){case 16000:s-enc_func g726_16_encoder;s-dec_func g726_16_decoder;s-bits_per_sample 2;break;case 24000:s-enc_func g726_24_encoder;s-dec_func g726_24_decoder;s-bits_per_sample 3;break;case 32000:default:s-enc_func g726_32_encoder;s-dec_func g726_32_decoder;s-bits_per_sample 4;break;case 40000:s-enc_func g726_40_encoder;s-dec_func g726_40_decoder;s-bits_per_sample 5;break;}bitstream_init(s-bs);return s;
}int g726_decode(g726_state_t *s,short amp[],const unsigned char g726_data[],int g726_bytes)
{int i;int samples;unsigned char code;int sl;for (samples i 0; ; ){if (s-bs.residue s-bits_per_sample){if (i g726_bytes)break;s-bs.bitstream (s-bs.bitstream 8) | g726_data[i];s-bs.residue 8;}code (unsigned char) ((s-bs.bitstream (s-bs.residue - s-bits_per_sample)) ((1 s-bits_per_sample) - 1));s-bs.residue - s-bits_per_sample;sl s-dec_func(s, code);amp[samples] (short) sl;}return samples;
}int g726_encode(g726_state_t *s,unsigned char g726_data[],const short amp[],int len)
{int i;int g726_bytes;short sl;unsigned char code;for (g726_bytes i 0; i len; i){sl amp[i] 2;code s-enc_func(s, sl);s-bs.bitstream (s-bs.bitstream s-bits_per_sample) | code;s-bs.residue s-bits_per_sample;if (s-bs.residue 8){g726_data[g726_bytes] (unsigned char) ((s-bs.bitstream (s-bs.residue - 8)) 0xFF);s-bs.residue - 8;}}return g726_bytes;
}
main.c
#include stdio.h
#include string.h
#include stdlib.h
#include getopt.h#include g726.h// 编译时Makefile里控制
#ifdef ENABLE_DEBUG#define DEBUG(fmt, args...) printf(fmt, ##args)
#else#define DEBUG(fmt, args...)
#endif#define BUF_SIZE 2048 void print_Usage(char *processName)
{printf(Usage: \n %s -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 16000 -o out_8khz_16kbps.g726\n %s -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 24000 -o out_8khz_24kbps.g726\n %s -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 32000 -o out_8khz_32kbps.g726\n %s -t pcm_2_g726 -i ./audio/test_8khz_16bit_mono_128kbps.pcm -r 40000 -o out_8khz_40kbps.g726\n %s -t g726_2_pcm -i ./audio/test_8khz_16kbps.g726 -r 16000 -o out_8khz_16bit_mono_128kbps-1.pcm\n %s -t g726_2_pcm -i ./audio/test_8khz_24kbps.g726 -r 24000 -o out_8khz_16bit_mono_128kbps-2.pcm\n %s -t g726_2_pcm -i ./audio/test_8khz_32kbps.g726 -r 32000 -o out_8khz_16bit_mono_128kbps-3.pcm\n %s -t g726_2_pcm -i ./audio/test_8khz_40kbps.g726 -r 40000 -o out_8khz_16bit_mono_128kbps-4.pcm\n,processName, processName, processName, processName, processName, processName, processName, processName);
}int main(int argc, char *argv[])
{unsigned int bitRates 0;unsigned char *inBuf (unsigned char *)malloc(BUF_SIZE);unsigned char *outBuf (unsigned char *)malloc(BUF_SIZE);char convertType[128];char inputFileName[128];char outputFileName[128];FILE *fpInput NULL;FILE *fpOutput NULL;g726_state_t *g726Handler NULL; // g726操作句柄if(argc 1){print_Usage(argv[0]);return -1;}// 解析命令行参数 -- start --char option 0;int option_index 0;const char *short_options ht:i:o:r:;struct option long_options[] {{help, no_argument, NULL, h},{convert_type, required_argument, NULL, t},{input_file, required_argument, NULL, i},{output_file, required_argument, NULL, o},{bit_rates, required_argument, NULL, r},{NULL, 0, NULL, 0 },}; while((option getopt_long_only(argc, argv, short_options, long_options, option_index)) ! -1) {switch(option){case h:print_Usage(argv[0]);return 0;case t:strncpy(convertType, optarg, 128);break;case i:strncpy(inputFileName, optarg, 128);break;case o:strncpy(outputFileName, optarg, 128);break;case r:bitRates atoi(optarg);break;defalut:printf(Unknown argument!\n);break;}}// 解析命令行参数 -- end --printf(\n**************************************\nconvert type: %s\ninput file name: %s\noutput file name: %s\ng726 bit rates: %d bps\n**************************************\n\n,!strcmp(convertType, pcm_2_g726) ? pcm - g726 : g726 - pcm,inputFileName, outputFileName, bitRates);fpInput fopen(inputFileName, rb);fpOutput fopen(outputFileName, wb);if(!fpInput || !fpOutput){printf(Open Input/Output file failed!\n);return -1;}// step 1: 先分配内存空间给操作句柄g726Handler (g726_state_t *)malloc(sizeof(g726_state_t));if(g726Handler NULL){printf(Alloc memory for g726 handler failed!\n);return -1;}// step 2: 根据比特率码率进行初始化得到句柄g726Handler g726_init(g726Handler, bitRates);// 按一帧160个采样点进行操作#define SAMPLES_PER_FRAME (160)if(strcmp(convertType, pcm_2_g726) 0) // encode{int readBytes -1;int ret -1;while(1){readBytes fread(inBuf, 1, SAMPLES_PER_FRAME*(16/8), fpInput);if(readBytes 0)break;/* 参数句柄、g726缓存传出、pcm缓存传入、pcm的采样点个数* 返回值编码得到的g726数据长度*/ret g726_encode(g726Handler, (unsigned char*)outBuf, (const short*)inBuf, readBytes/2); // 记得读到的字节数要除以2DEBUG([g726_encode] read pcm bytes: %d - encode g726 bytes: %d\n, readBytes, ret);if(ret ! readBytes * bitRates / 128000){printf(PCM encode to G726 failed!\n);printf(\033[31mFailed!\033[0m\n);break;}fwrite(outBuf, 1, ret, fpOutput);}}else if(strcmp(convertType, g726_2_pcm) 0) // decode{int readBytes -1;int ret -1;while(1){readBytes fread(inBuf, 1, SAMPLES_PER_FRAME * (16/8) * bitRates / 128000, fpInput);if(readBytes 0)break;/* 参数句柄、pcm缓存传出、g726缓存传入、g726数据长度* 返回值pcm的采样点个数注意不是字节数所以字节数是要x2*/ret g726_decode(g726Handler, (short*)outBuf, inBuf, readBytes);DEBUG([g726_decode] read g726 bytes: %d - decode pcm bytes: %d\n, readBytes, ret*2);if(ret*2 * bitRates / 128000 ! readBytes){printf(G726 decode to PCM failed!\n);printf(\033[31mFailed!\033[0m\n);break;}fwrite(outBuf, 2, ret, fpOutput);}}else{printf(Unknown convert type!\n);printf(\033[31mFailed!\033[0m\n);return -1;}printf(\033[32msuccess!\033[0m\n);// step : 释放句柄的内存free(g726Handler);free(inBuf);free(outBuf);fclose(fpInput);fclose(fpOutput);return 0;
}
3、demo下载地址任选一个
https://download.csdn.net/download/weixin_44498318/89525480https://gitee.com/linriming/audio_pcm_g726_convert.githttps://github.com/linriming20/audio_pcm_g726_convert.git
