如何讓SDL播放FLTP樣本（AAC）？

Question

該教程顯示這種方式，

SDL_AudioSpec wanted_spec, spec; 
wanted_spec.freq = aCodecCtx->sample_rate; 
wanted_spec.format = AUDIO_S16SYS; 
wanted_spec.channels = aCodecCtx->channels; 
wanted_spec.silence = 0; 
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE; 
wanted_spec.callback = audio_callback; 
wanted_spec.userdata = aCodecCtx; 
SDL_OpenAudio(&wanted_spec, &spec); 

它不工作，顯然樣品浮動點和SDL音頻規範格式是16個樣本。如何使SDL適用於浮點樣本？

Answer 1

大多數人通常使用libswresample（FFmpeg的一部分）將fltp轉換爲s16。