update

2 files changed, 88 insertions, 0 deletions

diff --git a/csrc/cbrr.c b/csrc/cbrr.c
new file mode 100644
index 0000000..f1eb2bd
--- /dev/null
+++ b/csrc/cbrr.c
@@ -0,0 +1,87 @@
+
+#include "cbrr.h"
+#include <alsa/asoundlib.h>
+#include <mpg123.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define PCM_DEVICE "default"
+
+void brr_c(char *filename) {
+  // Initialize the MPG123 library
+  mpg123_init();
+  mpg123_handle *mh = mpg123_new(NULL, NULL);
+  if (mpg123_open(mh, filename) != MPG123_OK) {
+    fprintf(stderr, "Error opening %s: %s\n", filename, mpg123_strerror(mh));
+    return;
+  }
+
+  // Retrieve the format of the MP3 file
+  long rate;
+  int channels, encoding;
+  if (mpg123_getformat(mh, &rate, &channels, &encoding) != MPG123_OK) {
+    fprintf(stderr, "Error getting format: %s\n", mpg123_strerror(mh));
+    return;
+  }
+
+  // Set the output format
+  snd_pcm_t *pcm_handle;
+  snd_pcm_hw_params_t *params;
+  int pcm, dir;
+  snd_pcm_uframes_t frames;
+  char *buffer;
+  int size;
+
+  // Open the PCM device
+  if (pcm = snd_pcm_open(&pcm_handle, PCM_DEVICE, SND_PCM_STREAM_PLAYBACK, 0) <
+            0) {
+    fprintf(stderr, "Error opening PCM device %s: %s\n", PCM_DEVICE,
+            snd_strerror(pcm));
+    return;
+  }
+
+  // Allocate hardware parameters object
+  snd_pcm_hw_params_alloca(&params);
+  snd_pcm_hw_params_any(pcm_handle, params);
+
+  // Set the desired hardware parameters
+  snd_pcm_hw_params_set_access(pcm_handle, params,
+                               SND_PCM_ACCESS_RW_INTERLEAVED);
+  snd_pcm_hw_params_set_format(pcm_handle, params, SND_PCM_FORMAT_S16_LE);
+  snd_pcm_hw_params_set_channels(pcm_handle, params, channels);
+  snd_pcm_hw_params_set_rate_near(pcm_handle, params, &rate, &dir);
+
+  // Write the parameters to the driver
+  if (pcm = snd_pcm_hw_params(pcm_handle, params) < 0) {
+    fprintf(stderr, "Error setting HW params: %s\n", snd_strerror(pcm));
+    return;
+  }
+
+  // Use a buffer large enough to hold one period
+  snd_pcm_hw_params_get_period_size(params, &frames, &dir);
+  size = frames * channels * 2; // 2 bytes/sample, 2 channels
+  buffer = (char *)malloc(size);
+
+  // Decode and play the MP3 file
+  size_t buffer_size = mpg123_outblock(mh);
+  unsigned char *mpg123_buffer =
+      (unsigned char *)malloc(buffer_size * sizeof(unsigned char));
+  size_t done;
+  int err;
+
+  while ((err = mpg123_read(mh, mpg123_buffer, buffer_size, &done)) ==
+         MPG123_OK) {
+    snd_pcm_writei(pcm_handle, mpg123_buffer, done / 4);
+  }
+
+  // Clean up
+  free(buffer);
+  free(mpg123_buffer);
+  snd_pcm_drain(pcm_handle);
+  snd_pcm_close(pcm_handle);
+  mpg123_close(mh);
+  mpg123_delete(mh);
+  mpg123_exit();
+
+  return;
+}
diff --git a/csrc/cbrr.h b/csrc/cbrr.h
new file mode 100644
index 0000000..e57fc64
--- /dev/null
+++ b/csrc/cbrr.h
@@ -0,0 +1 @@
+void brr_c(char *filename);