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alsa-utils/0001-aplay-try-to-use-16-bit-format-to-increase-capture-q.patch
Takashi Iwai f936d7ca95 Accepting request 865332 from home:tiwai:branches:multimedia:libs 
- Backport upstream fixes:
  various fixes in aplay, alsamixer, alsactl and alsaloop, updated
  translations, etc:
  0001-aplay-try-to-use-16-bit-format-to-increase-capture-q.patch
  0002-alsamixer-Fix-the-mixer-views-description-in-man-pag.patch
  0003-Add-Slovak-translation.patch
  0004-Add-Basque-translation.patch
  0006-aplay-cosmetic-code-fix-in-xrun.patch
  0007-aplay-fix-the-CPU-busy-loop-in-the-pause-handler.patch
  0008-alsa-info-Add-lsusb-and-stream-outputs.patch
  0013-aplay-add-test-code-for-snd_pcm_status-to-test-posit.patch
  0014-ucm-fix-typo-in-docs.patch
  0015-aplay-add-avail-delay-checks-to-test-position.patch
  0016-alsactl-daemon-read_pid_file-fix-the-returned-code-o.patch
  0017-alsactl-init-set_ctl_value-fix-bytes-parsing.patch
  0018-alsactl-init-parse-fix-possible-double-free.patch
  0019-alsaloop-fix-possible-memory-leak-in-create_loopback.patch
  0020-alsaloop-get_queued_playback_samples-simplify-code.patch
  0021-topology-fix-possible-double-free-in-load.patch
  0022-alsamixer-remove-dead-fcn-widget_handle_key-in-widge.patch
  0023-alsamixer-remove-unused-variable-y-in-display_scroll.patch
  0024-alsamixer-fix-shift-in-parse_words.patch
  0025-aplay-fix-the-test-position-test-for-playback-avail-.patch

OBS-URL: https://build.opensuse.org/request/show/865332
OBS-URL: https://build.opensuse.org/package/show/multimedia:libs/alsa-utils?expand=0&rev=188
2021-01-21 10:13:28 +00:00

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From 0c5948e98a6a8535c89b7bcab13017d7732181c6 Mon Sep 17 00:00:00 2001
From: Hui Wang <hui.wang@canonical.com>
Date: Fri, 23 Oct 2020 16:47:10 +0800
Subject: [PATCH 01/25] aplay: try to use 16-bit format to increase capture
quality
Recently users reported a bug, I tested it and found it is a common
issue on Laptop or Desktop machines.
The issue is users plug a headset and use "arecord test.wav" to
record a sound with default input volume, the recorded sound has
poor quality and nearly can't distinguish it is the sound we want
to record.
This is because the input volume is low and the default format is U8.
The driver records sound with 16bit, because the input volume is low,
most of samples are within (-256,+256), when converting 16bit to U8,
those samples will be 0x7f. This is called quantization noise and we
could only workaround it by increase the input volume or adding -f to
arecord.
But users want to record a better quality sound with default input
volume (after installing a new OS, the volume is the default volume),
and they don't want to add parameters to the arecord because most of
new linux users just use "arecord test.wav".
So this patch tries to change the default format from U8 to S16_LE/BE.
If the machine doesn't support S16_LE/BE, it still uses U8 as default
format.
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
aplay/aplay.c | 43 ++++++++++++++++++++++++++++++++++---------
1 file changed, 34 insertions(+), 9 deletions(-)
diff --git a/aplay/aplay.c b/aplay/aplay.c
index 0a65ad69fd14..a27220d8fd03 100644
--- a/aplay/aplay.c
+++ b/aplay/aplay.c
@@ -32,6 +32,7 @@
#include <malloc.h>
#include <unistd.h>
#include <stdlib.h>
+#include <stdbool.h>
#include <string.h>
#include <getopt.h>
#include <fcntl.h>
@@ -94,6 +95,7 @@ enum {
VUMETER_STEREO
};
+static snd_pcm_format_t default_format = DEFAULT_FORMAT;
static char *command;
static snd_pcm_t *handle;
static struct {
@@ -468,6 +470,24 @@ static long parse_long(const char *str, int *err)
return val;
}
+static void try_to_adjust_default_format_16bit(void)
+{
+ snd_pcm_hw_params_t *params;
+ int err;
+
+ snd_pcm_hw_params_alloca(&params);
+ err = snd_pcm_hw_params_any(handle, params);
+ if (err < 0) {
+ error(_("Broken configuration for this PCM: no configurations available"));
+ prg_exit(EXIT_FAILURE);
+ }
+
+ if (file_type != FORMAT_AU && snd_pcm_hw_params_test_format(handle, params, SND_PCM_FORMAT_S16_LE) == 0)
+ rhwparams.format = default_format = SND_PCM_FORMAT_S16_LE;
+ else if (file_type == FORMAT_AU && snd_pcm_hw_params_test_format(handle, params, SND_PCM_FORMAT_S16_BE) == 0)
+ rhwparams.format = default_format = SND_PCM_FORMAT_S16_BE;
+}
+
int main(int argc, char *argv[])
{
int duration_or_sample = 0;
@@ -528,6 +548,7 @@ int main(int argc, char *argv[])
int do_device_list = 0, do_pcm_list = 0;
snd_pcm_info_t *info;
FILE *direction;
+ bool user_set_fmt = false;
#ifdef ENABLE_NLS
setlocale(LC_ALL, "");
@@ -562,7 +583,7 @@ int main(int argc, char *argv[])
}
chunk_size = -1;
- rhwparams.format = DEFAULT_FORMAT;
+ rhwparams.format = default_format;
rhwparams.rate = DEFAULT_SPEED;
rhwparams.channels = 1;
@@ -612,6 +633,7 @@ int main(int argc, char *argv[])
}
break;
case 'f':
+ user_set_fmt = true;
if (strcasecmp(optarg, "cd") == 0 || strcasecmp(optarg, "cdr") == 0) {
if (strcasecmp(optarg, "cdr") == 0)
rhwparams.format = SND_PCM_FORMAT_S16_BE;
@@ -844,6 +866,9 @@ int main(int argc, char *argv[])
}
}
+ if (!user_set_fmt)
+ try_to_adjust_default_format_16bit();
+
chunk_size = 1024;
hwparams = rhwparams;
@@ -1064,7 +1089,7 @@ static ssize_t test_wavefile(int fd, u_char *_buffer, size_t size)
hwparams.channels = channels;
switch (TO_CPU_SHORT(f->bit_p_spl, big_endian)) {
case 8:
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != SND_PCM_FORMAT_U8)
fprintf(stderr, _("Warning: format is changed to U8\n"));
hwparams.format = SND_PCM_FORMAT_U8;
@@ -1074,7 +1099,7 @@ static ssize_t test_wavefile(int fd, u_char *_buffer, size_t size)
native_format = SND_PCM_FORMAT_S16_BE;
else
native_format = SND_PCM_FORMAT_S16_LE;
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != native_format)
fprintf(stderr, _("Warning: format is changed to %s\n"),
snd_pcm_format_name(native_format));
@@ -1087,7 +1112,7 @@ static ssize_t test_wavefile(int fd, u_char *_buffer, size_t size)
native_format = SND_PCM_FORMAT_S24_3BE;
else
native_format = SND_PCM_FORMAT_S24_3LE;
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != native_format)
fprintf(stderr, _("Warning: format is changed to %s\n"),
snd_pcm_format_name(native_format));
@@ -1098,7 +1123,7 @@ static ssize_t test_wavefile(int fd, u_char *_buffer, size_t size)
native_format = SND_PCM_FORMAT_S24_BE;
else
native_format = SND_PCM_FORMAT_S24_LE;
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != native_format)
fprintf(stderr, _("Warning: format is changed to %s\n"),
snd_pcm_format_name(native_format));
@@ -1184,19 +1209,19 @@ static int test_au(int fd, void *buffer)
pbrec_count = BE_INT(ap->data_size);
switch (BE_INT(ap->encoding)) {
case AU_FMT_ULAW:
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != SND_PCM_FORMAT_MU_LAW)
fprintf(stderr, _("Warning: format is changed to MU_LAW\n"));
hwparams.format = SND_PCM_FORMAT_MU_LAW;
break;
case AU_FMT_LIN8:
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != SND_PCM_FORMAT_U8)
fprintf(stderr, _("Warning: format is changed to U8\n"));
hwparams.format = SND_PCM_FORMAT_U8;
break;
case AU_FMT_LIN16:
- if (hwparams.format != DEFAULT_FORMAT &&
+ if (hwparams.format != default_format &&
hwparams.format != SND_PCM_FORMAT_S16_BE)
fprintf(stderr, _("Warning: format is changed to S16_BE\n"));
hwparams.format = SND_PCM_FORMAT_S16_BE;
@@ -2315,7 +2340,7 @@ static void voc_play(int fd, int ofs, char *name)
prg_exit(EXIT_FAILURE);
}
}
- hwparams.format = DEFAULT_FORMAT;
+ hwparams.format = default_format;
hwparams.channels = 1;
hwparams.rate = DEFAULT_SPEED;
set_params();
--
2.26.2
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