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代码对一些数据没做判断，仅仅是做个备忘！请谨慎参考！

#include 
   
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      #include 
      
       #include "libavcodec/avcodec.h"#include "libavutil/imgutils.h"#include "libswresample/swresample.h"/** * @brief 音频重采样 AV_SAMPLE_FMT_S16-->AV_SAMPLE_FMT_FLTP * @param argc * @param argv * @return */int main(int argc, char **argv) {  SwrContext *swr_context = NULL;  uint8_t *in_buf = NULL;  uint8_t **in_data = NULL;  int in_size = 0;  uint8_t **out_data = NULL;  int out_size = 0;  int line_size = 0;  int in_nb_samples = 1024;  int in_channel_count = 2;  int out_channel_count = 2;  int64_t in_ch_layout = AV_CH_LAYOUT_STEREO;  int64_t out_ch_layout = AV_CH_LAYOUT_STEREO;  int in_sample_rate = 44100, out_sample_rate = 44100;  int out_nb_samples = 0, max_out_nb_samples = 0;  enum AVSampleFormat in_sample_fmt = AV_SAMPLE_FMT_S16;  enum AVSampleFormat out_sample_fmt = AV_SAMPLE_FMT_FLTP;  FILE *in_file;  FILE *out_file;  int read_size;  int ret;  in_file = fopen(argv[1], "rb");  out_file = fopen(argv[2], "wb");  swr_context = swr_alloc();  if (!swr_context) {    printf("error 1\n");    exit(1);  }  av_opt_set_int(swr_context, "in_sample_rate", in_sample_rate, 0);  av_opt_set_int(swr_context, "in_channel_layout", in_ch_layout, 0);  av_opt_set_sample_fmt(swr_context, "in_sample_fmt", in_sample_fmt, 0);  av_opt_set_int(swr_context, "out_sample_rate", out_sample_rate, 0);  av_opt_set_int(swr_context, "out_channel_layout", out_ch_layout, 0);  av_opt_set_sample_fmt(swr_context, "out_sample_fmt", out_sample_fmt, 0);  ret = swr_init(swr_context);  if (ret < 0) {    printf("error 2\n");    exit(1);  }  ret = av_samples_alloc_array_and_samples(&in_data, &in_size, in_channel_count,                                           in_nb_samples, in_sample_fmt, 0);  if (ret < 0) {    printf("error 6\n");    exit(1);  }  out_nb_samples = max_out_nb_samples = av_rescale_rnd(      in_nb_samples, out_sample_rate, in_sample_rate, AV_ROUND_UP);  ret = av_samples_alloc_array_and_samples(&out_data, &out_size,                                           out_channel_count, out_nb_samples,                                           out_sample_fmt, 0);  if (ret < 0) {    printf("error 7\n");    exit(1);  }  //一次重采样多少数据  int bytes_per_frame = av_samples_get_buffer_size(      &line_size, in_channel_count, in_nb_samples, in_sample_fmt, 0);  in_buf = av_malloc(bytes_per_frame);  while ((read_size = fread(in_buf, 1, bytes_per_frame, in_file)) ==         bytes_per_frame) {    ret = av_samples_fill_arrays(in_data, &in_size, in_buf, in_channel_count,                                 in_nb_samples, in_sample_fmt, 0);    if (ret < 0) {      printf("error 3\n");      exit(1);    }    int64_t delay = swr_get_delay(swr_context, in_sample_rate);    out_nb_samples = av_rescale_rnd(in_nb_samples + delay, out_sample_rate,                                    in_sample_rate, AV_ROUND_UP);    if (out_nb_samples > max_out_nb_samples) {      av_freep(&out_data[0]);      av_freep(&out_data[1]);      ret = av_samples_alloc(out_data, out_size, out_channel_count,                             out_nb_samples, out_sample_fmt, 0);      if (ret < 0) break;      max_out_nb_samples = out_nb_samples;    }    printf("out_nb_samples:%i\n", out_nb_samples);    ret = swr_convert(swr_context, out_data, out_nb_samples,                      (const uint8_t **)in_data, in_nb_samples);    int bytes_per_sample = av_get_bytes_per_sample(AV_SAMPLE_FMT_FLTP);    // FLTP写成packeted样式    //    for (int i = 0; i < ret; i++) {    //      for (int j = 0; j < out_channel_count; j++) {    //        fwrite(out_data[j] + i * bytes_per_sample, 1, bytes_per_sample,    //               out_file);    //      }    //    }    // FLTP写成planar样式    int each_planr_size =        bytes_per_sample * ret;    for (int j = 0; j < out_channel_count; j++) {      fwrite(out_data[j], 1, each_planr_size, out_file);    }  }end:  fclose(in_file);  fclose(out_file);  av_freep(&in_buf);  av_freep(&in_data[0]);  av_freep(&in_data);  av_freep(&out_data[0]);  av_freep(&out_data[1]);  av_freep(&out_data);  swr_free(&swr_context);  printf("Hello World!\n");  return 0;}
      
     
    
   

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