[PATCH 17/17] audio: remove sw->ratio

[Volker Rümelin]

From: Volker Rümelin <vr_q...@t-online.de>

Simplify the resample buffer size calculation.

For audio playback we have
sw->ratio = ((int64_t)sw->hw->info.freq << 32) / sw->info.freq;
samples = ((int64_t)sw->HWBUF.size << 32) / sw->ratio;

This can be simplified to
samples = muldiv64(sw->HWBUF.size, sw->info.freq, sw->hw->info.freq);

For audio recording we have
sw->ratio = ((int64_t)sw->info.freq << 32) / sw->hw->info.freq;
samples = (int64_t)sw->HWBUF.size * sw->ratio >> 32;

This can be simplified to
samples = muldiv64(sw->HWBUF.size, sw->info.freq, sw->hw->info.freq);

With hw = sw->hw this becomes in both cases
samples = muldiv64(HWBUF.size, sw->info.freq, hw->info.freq);

Now that sw->ratio is no longer needed, remove sw->ratio.

Signed-off-by: Volker Rümelin <vr_q...@t-online.de>
---
 audio/audio.c          | 1 -
 audio/audio_int.h      | 2 --
 audio/audio_template.h | 9 +--------
 3 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/audio/audio.c b/audio/audio.c
index b846b89a27..b68ed4eb68 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -476,7 +476,6 @@ static int audio_attach_capture (HWVoiceOut *hw)
         sw->info = hw->info;
         sw->empty = 1;
         sw->active = hw->enabled;
-        sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq;
         sw->vol = nominal_volume;
         sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq);
         QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries);
diff --git a/audio/audio_int.h b/audio/audio_int.h
index f4ec5dcf11..3cd3539bd4 100644
--- a/audio/audio_int.h
+++ b/audio/audio_int.h
@@ -108,7 +108,6 @@ struct SWVoiceOut {
     AudioState *s;
     struct audio_pcm_info info;
     t_sample *conv;
-    int64_t ratio;
     STSampleBuffer resample_buf;
     void *rate;
     size_t total_hw_samples_mixed;
@@ -126,7 +125,6 @@ struct SWVoiceIn {
     AudioState *s;
     int active;
     struct audio_pcm_info info;
-    int64_t ratio;
     void *rate;
     size_t total_hw_samples_acquired;
     STSampleBuffer resample_buf;
diff --git a/audio/audio_template.h b/audio/audio_template.h
index 0cdf57760e..c053792da3 100644
--- a/audio/audio_template.h
+++ b/audio/audio_template.h
@@ -114,11 +114,7 @@ static int glue (audio_pcm_sw_alloc_resources_, TYPE) (SW 
*sw)
         return 0;
     }
 
-#ifdef DAC
-    samples = ((int64_t)sw->HWBUF.size << 32) / sw->ratio;
-#else
-    samples = (int64_t)sw->HWBUF.size * sw->ratio >> 32;
-#endif
+    samples = muldiv64(HWBUF.size, sw->info.freq, hw->info.freq);
     if (samples == 0) {
         size_t f_fe_min;
 
@@ -159,11 +155,8 @@ static int glue (audio_pcm_sw_init_, TYPE) (
     sw->hw = hw;
     sw->active = 0;
 #ifdef DAC
-    sw->ratio = ((int64_t) sw->hw->info.freq << 32) / sw->info.freq;
     sw->total_hw_samples_mixed = 0;
     sw->empty = 1;
-#else
-    sw->ratio = ((int64_t) sw->info.freq << 32) / sw->hw->info.freq;
 #endif
 
     if (sw->info.is_float) {
-- 
2.35.3