STF103VE CUBE IAR opus codec 移植

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迷雾向前发布时间：2017-1-18 16:21

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本帖最后由迷雾向前于 2017-1-20 11:22 编辑

计划在机器上STF103VE 跑opus codec 进行编解码，中途停了，写一下做个记录。

首先用CUBE 快速生成代码。
Clock 配置如下，我用的是内部时钟（应该没连接外部晶振）：

clock éç½®

Enable FreeRTOS ,heap 配置为 20K，enc 结构需要13k Ram。

FreeRTOS config

用于编解码的Task 的Stack 改为1024Word，即4K（小了会reset）

Task Stack

系统heap 需要改大，

System Heap

将OPUS 代码copy 到工程里面，将如下文件加入到编译（没权限添加更多图片，只能用文字描述了）

opus-1.1.3/silk/ana_filt_bank_1.c
opus-1.1.3/silk/bwexpander.c
opus-1.1.3/silk/control_audio_bandwidth.c
opus-1.1.3/silk/code_signs.c
opus-1.1.3/silk/CNG.c
opus-1.1.3/silk/fixed/schur64_FIX.c
opus-1.1.3/silk/control_codec.c
opus-1.1.3/silk/debug.c
opus-1.1.3/silk/control_SNR.c
opus-1.1.3/silk/fixed/residual_energy16_FIX.c
opus-1.1.3/silk/fixed/residual_energy_FIX.c
opus-1.1.3/silk/fixed/warped_autocorrelation_FIX.c
opus-1.1.3/silk/biquad_alt.c
opus-1.1.3/silk/bwexpander_32.c
opus-1.1.3/silk/check_control_input.c
opus-1.1.3/silk/A2NLSF.c
opus-1.1.3/silk/fixed/schur_FIX.c
opus-1.1.3/silk/fixed/solve_LS_FIX.c
opus-1.1.3/silk/fixed/vector_ops_FIX.c
opus-1.1.3/silk/encode_pulses.c
opus-1.1.3/silk/log2lin.c
opus-1.1.3/silk/enc_API.c
opus-1.1.3/silk/HP_variable_cutoff.c
opus-1.1.3/silk/init_decoder.c
opus-1.1.3/silk/init_encoder.c
opus-1.1.3/silk/decode_indices.c
opus-1.1.3/silk/inner_prod_aligned.c
opus-1.1.3/silk/decode_frame.c
opus-1.1.3/silk/decode_pulses.c
opus-1.1.3/silk/gain_quant.c
opus-1.1.3/silk/interpolate.c
opus-1.1.3/silk/lin2log.c
opus-1.1.3/silk/decode_parameters.c
opus-1.1.3/silk/dec_API.c
opus-1.1.3/silk/decode_core.c
opus-1.1.3/silk/decode_pitch.c
opus-1.1.3/silk/decoder_set_fs.c
opus-1.1.3/silk/encode_indices.c
opus-1.1.3/silk/quant_LTP_gains.c
opus-1.1.3/silk/NSQ.c
opus-1.1.3/silk/resampler.c
opus-1.1.3/silk/NLSF_del_dec_quant.c
opus-1.1.3/silk/NLSF2A.c
opus-1.1.3/silk/NLSF_stabilize.c
opus-1.1.3/silk/NLSF_unpack.c
opus-1.1.3/silk/NLSF_VQ.c
opus-1.1.3/silk/LPC_inv_pred_gain.c
opus-1.1.3/silk/NLSF_VQ_weights_laroia.c
opus-1.1.3/silk/pitch_est_tables.c
opus-1.1.3/silk/NSQ_del_dec.c
opus-1.1.3/silk/PLC.c
opus-1.1.3/silk/NLSF_decode.c
opus-1.1.3/silk/NLSF_encode.c
opus-1.1.3/silk/LP_variable_cutoff.c
opus-1.1.3/silk/LPC_analysis_filter.c
opus-1.1.3/silk/process_NLSFs.c
opus-1.1.3/silk/stereo_find_predictor.c
opus-1.1.3/silk/stereo_MS_to_LR.c
opus-1.1.3/silk/resampler_private_AR2.c
opus-1.1.3/silk/resampler_down2_3.c
opus-1.1.3/silk/stereo_LR_to_MS.c
opus-1.1.3/silk/stereo_encode_pred.c
opus-1.1.3/silk/resampler_down2.c
opus-1.1.3/silk/sigm_Q15.c
opus-1.1.3/silk/resampler_rom.c
opus-1.1.3/silk/sort.c
opus-1.1.3/silk/resampler_private_down_FIR.c
opus-1.1.3/silk/resampler_private_up2_HQ.c
opus-1.1.3/silk/stereo_decode_pred.c
opus-1.1.3/silk/shell_coder.c
opus-1.1.3/silk/resampler_private_IIR_FIR.c
opus-1.1.3/src/repacketizer.c
opus-1.1.3/silk/sum_sqr_shift.c
opus-1.1.3/silk/table_LSF_cos.c
opus-1.1.3/silk/tables_NLSF_CB_WB.c
opus-1.1.3/silk/stereo_quant_pred.c
opus-1.1.3/silk/VAD.c
opus-1.1.3/silk/tables_gain.c
opus-1.1.3/silk/tables_pulses_per_block.c
#opus-1.1.3/stm32_m3/opus_main.c
opus-1.1.3/src/opus_encoder.c
opus-1.1.3/silk/tables_NLSF_CB_NB_MB.c
opus-1.1.3/silk/tables_other.c
opus-1.1.3/src/opus.c
opus-1.1.3/silk/tables_pitch_lag.c
opus-1.1.3/src/opus_decoder.c
opus-1.1.3/silk/VQ_WMat_EC.c
opus-1.1.3/silk/tables_LTP.c
opus-1.1.3/celt/entdec.c
opus-1.1.3/celt/entenc.c
opus-1.1.3/celt/cwrs.c
opus-1.1.3/celt/mathops.c
opus-1.1.3/celt/kiss_fft.c
opus-1.1.3/celt/celt_lpc.c
opus-1.1.3/celt/mdct.c
opus-1.1.3/celt/modes.c
opus-1.1.3/celt/bands.c
opus-1.1.3/celt/pitch.c
opus-1.1.3/celt/celt_encoder.c
opus-1.1.3/celt/laplace.c
opus-1.1.3/celt/celt_decoder.c
opus-1.1.3/celt/entcode.c
opus-1.1.3/celt/celt.c
opus-1.1.3/silk/fixed/noise_shape_analysis_FIX.c
opus-1.1.3/silk/fixed/process_gains_FIX.c
opus-1.1.3/silk/fixed/regularize_correlations_FIX.c
opus-1.1.3/silk/fixed/autocorr_FIX.c
opus-1.1.3/celt/quant_bands.c
opus-1.1.3/silk/fixed/encode_frame_FIX.c
opus-1.1.3/silk/fixed/corrMatrix_FIX.c
opus-1.1.3/silk/fixed/find_LTP_FIX.c
opus-1.1.3/silk/fixed/pitch_analysis_core_FIX.c
opus-1.1.3/silk/fixed/prefilter_FIX.c
opus-1.1.3/celt/rate.c
opus-1.1.3/silk/fixed/find_pitch_lags_FIX.c
opus-1.1.3/silk/fixed/burg_modified_FIX.c
opus-1.1.3/silk/fixed/LTP_analysis_filter_FIX.c
opus-1.1.3/celt/vq.c
opus-1.1.3/silk/fixed/find_LPC_FIX.c
opus-1.1.3/silk/fixed/find_pred_coefs_FIX.c
opus-1.1.3/silk/fixed/apply_sine_window_FIX.c
opus-1.1.3/silk/fixed/k2a_FIX.c
opus-1.1.3/silk/fixed/LTP_scale_ctrl_FIX.c
opus-1.1.3/silk/fixed/k2a_Q16_FIX.c

我为opus-1.1.3建立了单独的group，并将这个group 的【Override inherited settings 】勾上

opus config

在【Proprocessor】里增加如下include 目录
$PROJ_DIR$/../opus-1.1.3/include
$PROJ_DIR$/../opus-1.1.3/celt
$PROJ_DIR$/../opus-1.1.3/silk
$PROJ_DIR$/../opus-1.1.3/silk/fixed
$PROJ_DIR$/../opus-1.1.3/stm32_m3
增加：HAVE_CONFIG_H 到【Defined symbols】
opus include.JPG

将【Language 1 】中的【Allow VLA】勾上，目的是#define VAR_ARRAYS 1 后能便宜通过。

copy opus-1.1.3/win32 到 opus-1.1.3/stm32_m3，建立config.h 和 version.h
config.h:
#ifndef CONFIG_H
#define CONFIG_H
//#define USE_ALLOCA          1
#define VAR_ARRAYS 1
/* Comment out the next line for floating-point code */
/*#define FIXED_POINT          1 */
#define OPUS_BUILD          1
#define DISABLE_FLOAT_API 1
#define FIXED_POINT 1
#define REMOVE_FOR_MALLOC
//以上部分内容为增加部分，其他的与win32下同名文件相同
#endif /* CONFIG_H */

version.h
#ifndef __VERSION_H__
#define __VERSION_H__
#define PACKAGE_VERSION  "1.1.3"
#endif /*__VERSION_H__*/

encode 和decode 代码：

pusDecoder *dec;
  static int offset = 0;
  int size = 0;
  const unsigned char *packet;
  int i = 0;
  int frame_size = 0;
  int max_size = 0;
  char buffer[36];

  uint32_t start = osKernelSysTick();

  OpusEncoder *enc = NULL;
  static int len = 10;

  size = opus_encoder_get_size(channels);
  enc = pvPortMalloc(size);
  error = opus_encoder_init(enc, Fs, channels, OPUS_APPLICATION_RESTRICTED_LOWDELAY);
  opus_encoder_ctl(enc, OPUS_SET_EXPERT_FRAME_DURATION(OPUS_FRAMESIZE_20_MS));
  //opus_encoder_ctl(enc, OPUS_SET_SIGNAL(OPUS_SIGNAL_VOICE));
  opus_encoder_ctl(enc, OPUS_SET_SIGNAL(OPUS_SIGNAL_MUSIC));

  len = opus_encode(enc, audio_frame + offset, Fs/50/*20ms*/, opus_buffer, sizeof(opus_buffer));
  offset += Fs/50;
  if(offset >= sizeof(audio_frame)/sizeof(uint16_t))
offset = 0;
  vPortFree(enc);
  OpusDecoder *st  = (OpusDecoder *)pvPortMalloc(opus_decoder_get_size(channels));
  error = opus_decoder_init(st, Fs, channels);


  frame_size = opus_decode(st, opus_buffer, len, pcm, PCM_BUFFER_SIZE, 0);

对了，我改了这两个宏，
#define MAX_FS_KHZ                            8 /*16 --> 8 modify for memory*/
#define MAX_API_FS_KHZ                         8 /*48 --> 8 modify for memory/
原因是，如果不修改opus_encoder_get_size(1); 返回的是27k，改完后还得13k，实在是没有那么多ram
size = opus_encoder_get_size(1);
enc = pvPortMalloc(size);

总结，64k ram 感觉刚刚够，还没有增加其他的功能，解压缩20ms 数据用了6-7ms，编码我忘记了，记得编解码用了33ms，有点高。
声音可以用DAC(PA4)播放出来，需要外加功放，不加功放声音很不好。经过opus 压缩解压后声音损失较大，音乐还能听出来，但很多噪声。