From f55454777c94b255eb52bdd2506fd8156a648a4a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sun, 23 Dec 2007 20:15:03 +0000
Subject: [PATCH] add API for resetting allocated resamplers

git-svn-id: svn://svn.0pointer.net/pulseaudio/trunk@2088 fefdeb5f-60dc-0310-8127-8f9354f1896f
---
 src/pulsecore/resampler.c | 38 +++++++++++++++++++++++++++++++-------
 src/pulsecore/resampler.h |  4 ++++
 2 files changed, 35 insertions(+), 7 deletions(-)

diff --git a/src/pulsecore/resampler.c b/src/pulsecore/resampler.c
index 429759f0..40fc2800 100644
--- a/src/pulsecore/resampler.c
+++ b/src/pulsecore/resampler.c
@@ -72,6 +72,7 @@ struct pa_resampler {
     void (*impl_free)(pa_resampler *r);
     void (*impl_update_rates)(pa_resampler *r);
     void (*impl_resample)(pa_resampler *r, const pa_memchunk *in, unsigned in_samples, pa_memchunk *out, unsigned *out_samples);
+    void (*impl_reset)(pa_resampler *r);
 
     struct { /* data specific to the trivial resampler */
         unsigned o_counter;
@@ -208,6 +209,7 @@ pa_resampler* pa_resampler_new(
     r->impl_free = NULL;
     r->impl_update_rates = NULL;
     r->impl_resample = NULL;
+    r->impl_reset = NULL;
 
     /* Fill sample specs */
     r->i_ss = *a;
@@ -374,6 +376,13 @@ size_t pa_resampler_max_block_size(pa_resampler *r) {
     return (((block_size_max/fs + EXTRA_SAMPLES)*r->i_ss.rate)/ss.rate)*r->i_fz;
 }
 
+void pa_resampler_reset(pa_resampler *r) {
+    pa_assert(r);
+
+    if (r->impl_reset)
+        r->impl_reset(r);
+}
+
 pa_resample_method_t pa_resampler_get_method(pa_resampler *r) {
     pa_assert(r);
 
@@ -1181,6 +1190,12 @@ static void libsamplerate_update_rates(pa_resampler *r) {
     pa_assert_se(src_set_ratio(r->src.state, (double) r->o_ss.rate / r->i_ss.rate) == 0);
 }
 
+static void libsamplerate_reset(pa_resampler *r) {
+    pa_assert(r);
+
+    pa_assert_se(src_reset(r->src.state) == 0);
+}
+
 static void libsamplerate_free(pa_resampler *r) {
     pa_assert(r);
 
@@ -1199,6 +1214,7 @@ static int libsamplerate_init(pa_resampler *r) {
     r->impl_free = libsamplerate_free;
     r->impl_update_rates = libsamplerate_update_rates;
     r->impl_resample = libsamplerate_resample;
+    r->impl_reset = libsamplerate_reset;
 
     return 0;
 }
@@ -1259,6 +1275,17 @@ static void speex_update_rates(pa_resampler *r) {
     }
 }
 
+static void speex_reset(pa_resampler *r) {
+    pa_assert(r);
+
+    if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX)
+        pa_assert_se(paspfx_resampler_reset_mem(r->speex.state) == 0);
+    else  {
+        pa_assert(r->method >= PA_RESAMPLER_SPEEX_FLOAT_BASE && r->method <= PA_RESAMPLER_SPEEX_FLOAT_MAX);
+        pa_assert_se(paspfl_resampler_reset_mem(r->speex.state) == 0);
+    }
+}
+
 static void speex_free(pa_resampler *r) {
     pa_assert(r);
 
@@ -1280,6 +1307,7 @@ static int speex_init(pa_resampler *r) {
 
     r->impl_free = speex_free;
     r->impl_update_rates = speex_update_rates;
+    r->impl_reset = speex_reset;
 
     if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX) {
         q = r->method - PA_RESAMPLER_SPEEX_FIXED_BASE;
@@ -1353,7 +1381,7 @@ static void trivial_resample(pa_resampler *r, const pa_memchunk *input, unsigned
     }
 }
 
-static void trivial_update_rates(pa_resampler *r) {
+static void trivial_update_rates_or_reset(pa_resampler *r) {
     pa_assert(r);
 
     r->trivial.i_counter = 0;
@@ -1366,8 +1394,8 @@ static int trivial_init(pa_resampler*r) {
     r->trivial.o_counter = r->trivial.i_counter = 0;
 
     r->impl_resample = trivial_resample;
-    r->impl_update_rates = trivial_update_rates;
-    r->impl_free = NULL;
+    r->impl_update_rates = trivial_update_rates_or_reset;
+    r->impl_reset = trivial_update_rates_or_reset;
 
     return 0;
 }
@@ -1495,9 +1523,5 @@ static int copy_init(pa_resampler *r) {
 
     pa_assert(r->o_ss.rate == r->i_ss.rate);
 
-    r->impl_free = NULL;
-    r->impl_resample = NULL;
-    r->impl_update_rates = NULL;
-
     return 0;
 }
diff --git a/src/pulsecore/resampler.h b/src/pulsecore/resampler.h
index 778c738d..82d01082 100644
--- a/src/pulsecore/resampler.h
+++ b/src/pulsecore/resampler.h
@@ -81,6 +81,9 @@ void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate);
 /* Change the output rate of the resampler object */
 void pa_resampler_set_output_rate(pa_resampler *r, uint32_t rate);
 
+/* Reinitialize state of the resampler, possibly due to seeking or other discontinuities */
+void pa_resampler_reset(pa_resampler *r);
+
 /* Return the resampling method of the resampler object */
 pa_resample_method_t pa_resampler_get_method(pa_resampler *r);
 
@@ -93,4 +96,5 @@ const char *pa_resample_method_to_string(pa_resample_method_t m);
 /* Return 1 when the specified resampling method is supported */
 int pa_resample_method_supported(pa_resample_method_t m);
 
+
 #endif
-- 
2.11.4.GIT