please update the code to check for errors in the snd_pcm_hw_params functions

chatgpt-cpp-audio2.cpp

#include <alsa/asoundlib.h>
#include <iostream>

int main() {
  // Open the default PCM device
  snd_pcm_t *handle;
  int error = snd_pcm_open(&handle, "default", SND_PCM_STREAM_CAPTURE, 0);
  if (error < 0) {
    std::cerr << "Error opening PCM device: " << snd_strerror(error) << std::endl;
    return 1;
  }

  // Set the audio parameters
  snd_pcm_hw_params_t *params;
  snd_pcm_hw_params_alloca(&params);
  snd_pcm_hw_params_any(handle, params);
  snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
  snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);

  // Set the sample rate
  unsigned int sampleRate = 44100;
  error = snd_pcm_hw_params_set_rate_near(handle, params, &sampleRate, 0);
  if (error < 0) {
    std::cerr << "Error setting sample rate: " << snd_strerror(error) << std::endl;
    return 1;
  }
  std::cout << "Sample rate set to " << sampleRate << " Hz" << std::endl;

  // Set the number of channels
  unsigned int channels = 2;
  error = snd_pcm_hw_params_set_channels(handle, params, channels);
  if (error < 0) {
    std::cerr << "Error setting number of channels: " << snd_strerror(error) << std::endl;
    return 1;
  }
  std::cout << "Number of channels set to " << channels << std::endl;

  // Set the audio parameters
  error = snd_pcm_hw_params(handle, params);
  if (error < 0) {
    std::cerr << "Error setting PCM parameters: " << snd_strerror(error) << std::endl;
    return 1;
  }

  // Allocate a buffer to hold the audio data
  const int bufferSize = 4096;
  short buffer[bufferSize];

  // Read audio data in a loop
  while (true) {
    // Read audio data from the microphone
    int readCount = snd_pcm_readi(handle, buffer, bufferSize);
    if (readCount < 0) {
      std::cerr << "Error reading audio data: " << snd_strerror(readCount) << std::endl;
      return 1;
    }

    // Process the audio data here...
  }

  // Close the PCM device
  snd_pcm_close(handle);

  return 0;
}

In a follow up request, ChatGPT also generated the CMakeLists.txt file to build the code:

cmake_minimum_required(VERSION 3.10)
project(alsa_example)

# Find the ALSA library
find_package(ALSA REQUIRED)

# Add the source files
set(SOURCES main.cpp)

# Add the executable
add_executable(alsa_example ${SOURCES})

# Link the executable with the ALSA library
target_link_libraries(alsa_example PRIVATE ${ALSA_LIBRARIES})