From 7b0900081349f8a603a8315948826faf9600039d Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Sat, 22 Feb 2003 17:53:01 +0000
Subject: [PATCH] Removed snd_pcm_hwdiff() function

---
 include/pcm.h        |  1 -
 src/Versions         |  1 -
 src/pcm/pcm.c        | 44 --------------------------------------------
 src/pcm/pcm_dmix.c   |  2 +-
 src/pcm/pcm_hw.c     |  4 ++--
 src/pcm/pcm_local.h  |  1 -
 src/pcm/pcm_plugin.c |  2 +-
 7 files changed, 4 insertions(+), 51 deletions(-)

diff --git a/include/pcm.h b/include/pcm.h
index e2121886..49279172 100644
--- a/include/pcm.h
+++ b/include/pcm.h
@@ -410,7 +410,6 @@ int snd_pcm_drain(snd_pcm_t *pcm);
 int snd_pcm_pause(snd_pcm_t *pcm, int enable);
 snd_pcm_state_t snd_pcm_state(snd_pcm_t *pcm);
 int snd_pcm_hwsync(snd_pcm_t *pcm);
-int snd_pcm_hwdiff(snd_pcm_t *pcm, snd_pcm_uframes_t *diff, snd_pcm_uframes_t *old_pos);
 int snd_pcm_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp);
 int snd_pcm_resume(snd_pcm_t *pcm);
 snd_pcm_sframes_t snd_pcm_avail_update(snd_pcm_t *pcm);
diff --git a/src/Versions b/src/Versions
index ea45321a..b9dd7407 100644
--- a/src/Versions
+++ b/src/Versions
@@ -83,7 +83,6 @@ ALSA_0.9.0rc4 {
 ALSA_0.9.0rc8 {
   global:
 
-    snd_pcm_hwdiff;
     snd_pcm_forward;
 
 } ALSA_0.9.0rc4;
diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c
index b53c43c7..c4b31c39 100644
--- a/src/pcm/pcm.c
+++ b/src/pcm/pcm.c
@@ -400,12 +400,6 @@ only when the stream is in the running or draining (playback only) state.
 Note that this function does not update the current r/w pointer for applications,
 so the function \link ::snd_pcm_avail_update \endlink must be called afterwards
 before any read/write begin+commit operations.
-<p>
-To determine the processed frames by hardware, the function \link ::snd_pcm_hwdiff \endlink
-might be used. Note that this function returns cached value which is synchronized with
-hardware using the \link ::snd_pcm_hwsync \endlink function. The application may
-manage the right r/w pointer via \link ::snd_pcm_rewind \endlink and
-\link ::snd_pcm_forward \endlink functions.
 
 \section pcm_action Managing the stream state
 
@@ -874,44 +868,6 @@ int snd_pcm_hwsync(snd_pcm_t *pcm)
 	return pcm->fast_ops->hwsync(pcm->fast_op_arg);
 }
 
-/**
- * \brief Return count of processed frames by hardware from last call
- * \param pcm PCM handle
- * \param diff Difference between last position and current
- * \param old_pos Old position on entry, actual position on exit
- * \return 0 on success otherwise a negative error code
- *
- * The old_ptr parameter is in range 0 ... (boundary - 1). It contains
- * count_of_ring_buffer_crosses * buffer_size + offset in the ring buffer.
- * Using this value is not intented 
- *
- * Note this function does not obtain the real position from hardware.
- * The function \link ::snd_pcm_hwsync \endlink have to be called
- * before to obtain the real hardware position.
- */
-#ifndef DOXYGEN
-int INTERNAL(snd_pcm_hwdiff)(snd_pcm_t *pcm, snd_pcm_uframes_t *diff, snd_pcm_uframes_t *old_pos)
-#else
-int snd_pcm_hwdiff(snd_pcm_t *pcm, snd_pcm_uframes_t *diff, snd_pcm_uframes_t *old_pos)
-#endif
-{
-	snd_pcm_uframes_t d, hw_ptr;
-
-	assert(pcm && diff && old_pos);
-	assert(pcm->setup);
-	assert(*old_pos < pcm->boundary);
-	hw_ptr = *pcm->hw.ptr;
-	if (hw_ptr < *old_pos) {
-		d = (pcm->boundary - *old_pos) + hw_ptr;
-	} else {
-		d = hw_ptr - *old_pos;
-	}
-	*diff = d;
-	*old_pos = hw_ptr;
-	return 0;
-}
-default_symbol_version(__snd_pcm_hwdiff, snd_pcm_hwdiff, ALSA_0.9.0rc8);
-
 /**
  * \brief Obtain delay for a running PCM handle
  * \param pcm PCM handle
diff --git a/src/pcm/pcm_dmix.c b/src/pcm/pcm_dmix.c
index 588b3020..0dcfaac8 100644
--- a/src/pcm/pcm_dmix.c
+++ b/src/pcm/pcm_dmix.c
@@ -1096,7 +1096,7 @@ static snd_pcm_sframes_t snd_pcm_dmix_forward(snd_pcm_t *pcm, snd_pcm_uframes_t
 	avail = snd_pcm_mmap_avail(pcm);
 	if (avail < 0)
 		return 0;
-	if (frames > avail)
+	if (frames > (snd_pcm_uframes_t)avail)
 		frames = avail;
 	snd_pcm_mmap_appl_forward(pcm, frames);
 	return frames;
diff --git a/src/pcm/pcm_hw.c b/src/pcm/pcm_hw.c
index ef27ea84..a3a97507 100644
--- a/src/pcm/pcm_hw.c
+++ b/src/pcm/pcm_hw.c
@@ -533,7 +533,7 @@ static snd_pcm_sframes_t snd_pcm_hw_forward(snd_pcm_t *pcm, snd_pcm_uframes_t fr
 	avail = snd_pcm_mmap_avail(pcm);
 	if (avail < 0)
 		return 0;
-	if (frames > avail)
+	if (frames > (snd_pcm_uframes_t)avail)
 		frames = avail;
 	snd_pcm_mmap_appl_forward(pcm, frames);
 	return frames;
@@ -715,7 +715,7 @@ static int snd_pcm_hw_close(snd_pcm_t *pcm)
 }
 
 static snd_pcm_sframes_t snd_pcm_hw_mmap_commit(snd_pcm_t *pcm,
-						snd_pcm_uframes_t offset,
+						snd_pcm_uframes_t offset ATTRIBUTE_UNUSED,
 						snd_pcm_uframes_t size)
 {
 	snd_pcm_hw_t *hw = pcm->private_data;
diff --git a/src/pcm/pcm_local.h b/src/pcm/pcm_local.h
index bc85ebc4..5873b1bd 100644
--- a/src/pcm/pcm_local.h
+++ b/src/pcm/pcm_local.h
@@ -550,7 +550,6 @@ int snd_pcm_hw_param_get_max(const snd_pcm_hw_params_t *params,
 			     unsigned int *val, int *dir);
 
 #ifdef INTERNAL
-int INTERNAL(snd_pcm_hwdiff)(snd_pcm_t *pcm, snd_pcm_uframes_t *diff, snd_pcm_uframes_t *old_pos);
 snd_pcm_sframes_t INTERNAL(snd_pcm_forward)(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
 
 int INTERNAL(snd_pcm_hw_params_get_access)(const snd_pcm_hw_params_t *params, snd_pcm_access_t *access);
diff --git a/src/pcm/pcm_plugin.c b/src/pcm/pcm_plugin.c
index 51e56475..ce713055 100644
--- a/src/pcm/pcm_plugin.c
+++ b/src/pcm/pcm_plugin.c
@@ -325,7 +325,7 @@ snd_pcm_sframes_t snd_pcm_plugin_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frame
 		sframes = frames;
 	snd_atomic_write_begin(&plugin->watom);
 	sframes = snd_pcm_forward(plugin->slave, (snd_pcm_uframes_t) sframes);
-	if (sframes < 0) {
+	if ((snd_pcm_sframes_t) sframes < 0) {
 		snd_atomic_write_end(&plugin->watom);
 		return sframes;
 	}
-- 
2.47.1