[PATCH 4/7] audio: Split advance() helper as in() and out()

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

When the buffer is to be filled, rename as advance_in().
When the buffer is already filled, use advance_out().

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 audio/audio_int.h | 8 +++++++-
 audio/alsaaudio.c | 4 ++--
 audio/audio.c     | 2 +-
 audio/ossaudio.c  | 4 ++--
 4 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/audio/audio_int.h b/audio/audio_int.h
index fb6947c435..62829de4e8 100644
--- a/audio/audio_int.h
+++ b/audio/audio_int.h
@@ -255,12 +255,18 @@ static inline size_t audio_ring_dist(size_t dst, size_t src, size_t len)
     return (dst >= src) ? (dst - src) : (len - src + dst);
 }
 
-static inline void *advance(void *p, int incr)
+static inline void *advance_in(void *p, int incr)
 {
     uint8_t *d = p;
     return d + incr;
 }
 
+static inline const void *advance_out(const void *p, int incr)
+{
+    const uint8_t *d = p;
+    return d + incr;
+}
+
 #define dolog(fmt, ...) AUD_log(AUDIO_CAP, fmt, ## __VA_ARGS__)
 
 #ifdef DEBUG
diff --git a/audio/alsaaudio.c b/audio/alsaaudio.c
index a8e62542f9..a32db8ff39 100644
--- a/audio/alsaaudio.c
+++ b/audio/alsaaudio.c
@@ -615,7 +615,7 @@ static size_t alsa_write(HWVoiceOut *hw, void *buf, size_t len)
     size_t len_frames = len / hw->info.bytes_per_frame;
 
     while (len_frames) {
-        char *src = advance(buf, pos);
+        const char *src = advance_out(buf, pos);
         snd_pcm_sframes_t written;
 
         written = snd_pcm_writei(alsa->handle, src, len_frames);
@@ -809,7 +809,7 @@ static size_t alsa_read(HWVoiceIn *hw, void *buf, size_t len)
     size_t pos = 0;
 
     while (len) {
-        void *dst = advance(buf, pos);
+        void *dst = advance_in(buf, pos);
         snd_pcm_sframes_t nread;
 
         nread = snd_pcm_readi(
diff --git a/audio/audio.c b/audio/audio.c
index 7a9e680355..c75455bbb5 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -571,7 +571,7 @@ static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len)
 
     while (len) {
         st_sample *src = hw->mix_buf->samples + pos;
-        uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame);
+        uint8_t *dst = advance_in(pcm_buf, clipped * hw->info.bytes_per_frame);
         size_t samples_till_end_of_buf = hw->mix_buf->size - pos;
         size_t samples_to_clip = MIN(len, samples_till_end_of_buf);
 
diff --git a/audio/ossaudio.c b/audio/ossaudio.c
index f88d076ec2..7778138df5 100644
--- a/audio/ossaudio.c
+++ b/audio/ossaudio.c
@@ -439,7 +439,7 @@ static size_t oss_write(HWVoiceOut *hw, void *buf, size_t len)
     pos = 0;
     while (len) {
         ssize_t bytes_written;
-        void *pcm = advance(buf, pos);
+        const void *pcm = advance_out(buf, pos);
 
         bytes_written = write(oss->fd, pcm, len);
         if (bytes_written < 0) {
@@ -678,7 +678,7 @@ static size_t oss_read(HWVoiceIn *hw, void *buf, size_t len)
     while (len) {
         ssize_t nread;
 
-        void *dst = advance(buf, pos);
+        void *dst = advance_in(buf, pos);
         nread = read(oss->fd, dst, len);
 
         if (nread == -1) {
-- 
2.21.3