[Speex-dev] 【SPEEX】 use speex resample make noise

[Jean-Marc Valin]

Look, how about you start from the testresample.c file? Oh, and you seem 
to be reading 320 samples at a time and processing 640, so that can't be 
good (and even beyond that your code is wrong for other reasons).

	Jean-Marc

On 11/6/19 1:56 AM, zhouyuchen at iauto.com wrote:
> Hello,
> I printed the log, in/out len is not truncated, which means that the 
> input and output are not truncated,
> but the sound quality is very bad, what would be the cause?
> I tried to call speex_resampler_reset_mem before each sample, but the 
> effect is not as good as usual.
> 
> int main()
> {
>      int err;
>      SpeexResamplerState *speex_resampler;
>      speex_resampler = speex_resampler_init(1, 16000, 48000, 10, &err);
>      FILE *fp = fopen("/data/zhou.wav", "rb+");
>      FILE *fp2 = fopen("/data/zhou2.wav", "ab+");
>      spx_int16_t inbuff[640] = {0};
>      spx_int16_t outbuff[1920] = {0};
>      spx_uint32_t inlen = 640;
>      spx_uint32_t outlen = 1920;
>      while (1)
>      {
>          speex_resampler_reset_mem(speex_resampler);
>          int len = fread(inbuff, 2, 320, fp);
>          if (len <= 0)
>          {
>              break;
>          }
>          int ret = speex_resampler_process_int(speex_resampler,
>                                                  0,
>                                                  inbuff,
>                                                  &inlen,
>                                                  outbuff,
>                                                  &outlen);
>          printf("ret is %d\n", ret);
>          printf("inlen is %d\n",inlen);
>          printf("outlen is %d\n",outlen);
>          fwrite(outbuff, 1, outlen, fp2);
>      }
>      fflush(fp2);
>      fclose(fp2);
>      speex_resampler_destroy(speex_resampler);
>      return 0;
> }
> 
> 
> ------------------------------------------------------------------------
> 以上
> 如有问题，请联系我
> mail zhouyuchen at iauto.com <mailto:zhouyuchen at iauto.com>
> tel 1905
> 
>     *发件人：* Jean-Marc Valin <mailto:jmvalin at jmvalin.ca>
>     *发送时间：* 2019-11-06 01:20
>     *收件人：* zhouyuchen at iauto.com <mailto:zhouyuchen at iauto.com>;
>     speex-dev <mailto:speex-dev at xiph.org>
>     *抄送：* jean-marc.valin <mailto:jean-marc.valin at usherbrooke.ca>
>     *主题：* Re: 【SPEEX】 use speex resample make noise
>     Be aware that inlen is an in/out parameter. It tells you how many
>     samples the resampler read. That number can be smaller than what you
>     passed -- in which case it means you need to buffer them and give them
>     to the resampler again in the next call.
>     Jean-Marc
>     On 11/5/19 8:27 AM, zhouyuchen at iauto.com wrote:
>      > Hello,
>      > I have encountered some problems. I want to use speex to convert the
>      > sampling rate (16000->48000).
>      > When I read 640bytes each time, I found that the sound after the
>     sound
>      > conversion is very noisy,
>      > but if I read 6400bytes each time. The conversion will be much
>     better,
>      > the line is my sample code, am I using it incorrectly? please
>     help confirm?
>      >
>      > int main()
>      > {
>      >      SpeexResamplerState *speex_resampler;
>      >      int err;
>      >      speex_resampler = speex_resampler_init(1, 16000, 48000, 10,
>     &err);
>      >      FILE *fp = fopen("/data/zhou.wav", "rb+");
>      >      FILE *fp2 = fopen("/data/zhou2.wav", "ab+");
>      >      spx_int16_t inbuff[640] = {0};
>      >      spx_int16_t outbuff[1920] = {0};
>      >      spx_uint32_t inlen = 640;
>      >      spx_uint32_t outlen = 1920;
>      >      speex_resampler_skip_zeros(speex_resampler);
>      >      while (1)
>      >      {
>      >          int len = fread(inbuff, 2, 320, fp);
>      >          if (len <= 0)
>      >          {
>      >              break;
>      >          }
>      >          int ret = speex_resampler_process_int(speex_resampler,
>      >                                                  0,
>      >                                                  inbuff,
>      >                                                  &inlen,
>      >                                                  outbuff,
>      >                                                  &outlen);
>      >          printf("ret is %d\n", ret);
>      >          printf("outlen is %d\n",outlen);
>      >          fwrite(outbuff, 1, outlen, fp2);
>      >      }
>      >
>      >      return 0;
>      > }
>      >
>      >
>      >
>      >
>     ------------------------------------------------------------------------
>      > 以上
>      > 如有问题，请联系我
>      > mail zhouyuchen at iauto.com <mailto:zhouyuchen at iauto.com>
>      > tel 1905
>      >
>