Use audio_format_t consistently

Change-Id: I2e2a5f625956dc5d09dbdc3f6f2d9a010ecc7bad
diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index 5f420a4..30d8b2e 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -1139,7 +1139,7 @@
     return 0;
 }
 
-static int check_input_parameters(uint32_t sample_rate, int format, int channel_count)
+static int check_input_parameters(uint32_t sample_rate, audio_format_t format, int channel_count)
 {
     if (format != AUDIO_FORMAT_PCM_16_BIT)
         return -EINVAL;
@@ -1164,7 +1164,7 @@
     return 0;
 }
 
-static size_t get_input_buffer_size(uint32_t sample_rate, int format, int channel_count)
+static size_t get_input_buffer_size(uint32_t sample_rate, audio_format_t format, int channel_count)
 {
     size_t size;
     size_t device_rate;
@@ -1292,12 +1292,12 @@
     return AUDIO_CHANNEL_OUT_STEREO;
 }
 
-static int out_get_format(const struct audio_stream *stream)
+static audio_format_t out_get_format(const struct audio_stream *stream)
 {
     return AUDIO_FORMAT_PCM_16_BIT;
 }
 
-static int out_set_format(struct audio_stream *stream, int format)
+static int out_set_format(struct audio_stream *stream, audio_format_t format)
 {
     return 0;
 }
@@ -1616,12 +1616,12 @@
     }
 }
 
-static int in_get_format(const struct audio_stream *stream)
+static audio_format_t in_get_format(const struct audio_stream *stream)
 {
     return AUDIO_FORMAT_PCM_16_BIT;
 }
 
-static int in_set_format(struct audio_stream *stream, int format)
+static int in_set_format(struct audio_stream *stream, audio_format_t format)
 {
     return 0;
 }
@@ -2164,7 +2164,7 @@
 
 
 static int adev_open_output_stream(struct audio_hw_device *dev,
-                                   uint32_t devices, int *format,
+                                   uint32_t devices, audio_format_t *format,
                                    uint32_t *channels, uint32_t *sample_rate,
                                    struct audio_stream_out **stream_out)
 {
@@ -2356,7 +2356,7 @@
 }
 
 static size_t adev_get_input_buffer_size(const struct audio_hw_device *dev,
-                                         uint32_t sample_rate, int format,
+                                         uint32_t sample_rate, audio_format_t format,
                                          int channel_count)
 {
     size_t size;
@@ -2368,7 +2368,7 @@
 }
 
 static int adev_open_input_stream(struct audio_hw_device *dev, uint32_t devices,
-                                  int *format, uint32_t *channel_mask,
+                                  audio_format_t *format, uint32_t *channel_mask,
                                   uint32_t *sample_rate,
                                   audio_in_acoustics_t acoustics,
                                   struct audio_stream_in **stream_in)