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audio: alsa_utils: use alsa for hdmi devices

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* HDMI audio devices on Raspberry Pi use FORMAT_IEC958_SUBFRAME_LE which
  is not supported by tinyalsa used on Android. Use ALSA library and its
  virtual vc4 audio devices that use IEC958 plugin to manage the subframe
  conversion.
This commit is contained in:
Konsta
2025-10-25 15:28:49 +03:00
parent 3306b79d41
commit 3ca268d760
4 changed files with 179 additions and 0 deletions
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12
audio/alsa_utils/include/alsa_device_proxy.h
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@@ -1,5 +1,6 @@
/*
* Copyright (C) 2014 The Android Open Source Project
* Copyright (C) 2025 KonstaKANG
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -17,6 +18,7 @@
#ifndef ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
#define ANDROID_SYSTEM_MEDIA_ALSA_UTILS_ALSA_DEVICE_PROXY_H
#include <alsa/asoundlib.h>
#include <tinyalsa/asoundlib.h>
#include "alsa_device_profile.h"
@@ -27,6 +29,7 @@ typedef struct {
struct pcm_config alsa_config;
struct pcm * pcm;
snd_pcm_t * pcm_alsa;
size_t frame_size; /* valid after proxy_prepare(), the frame size in bytes */
uint64_t transferred; /* the total frames transferred, not cleared on standby */
@@ -38,13 +41,20 @@ int proxy_prepare(alsa_device_proxy * proxy, const alsa_device_profile * profile
struct pcm_config * config, bool require_exact_match);
int proxy_prepare_from_default_config(
alsa_device_proxy * proxy, const alsa_device_profile * profile);
int hdmi_proxy_prepare_from_default_config(
alsa_device_proxy * proxy, const alsa_device_profile * profile);
int proxy_open(alsa_device_proxy * proxy);
int hdmi_proxy_open(alsa_device_proxy * proxy);
void proxy_close(alsa_device_proxy * proxy);
void hdmi_proxy_close(alsa_device_proxy * proxy);
int proxy_get_presentation_position(const alsa_device_proxy * proxy,
uint64_t *frames, struct timespec *timestamp);
int hdmi_proxy_get_presentation_position(const alsa_device_proxy * proxy,
uint64_t *frames, struct timespec *timestamp);
int proxy_get_capture_position(const alsa_device_proxy * proxy,
int64_t *frames, int64_t *time);
int proxy_stop(alsa_device_proxy * proxy);
int hdmi_proxy_stop(alsa_device_proxy * proxy);
/* Attributes */
unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy);
@@ -66,6 +76,8 @@ int proxy_scan_rates(alsa_device_proxy * proxy, const unsigned sample_rates[],
int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count);
int proxy_write_with_retries(
alsa_device_proxy * proxy, const void *data, unsigned int count, int tries);
int hdmi_proxy_write_with_retries(
alsa_device_proxy * proxy, const void *data, unsigned int count, int tries);
int proxy_read(alsa_device_proxy * proxy, void *data, unsigned int count);
int proxy_read_with_retries(
alsa_device_proxy * proxy, void *data, unsigned int count, int tries);