audio/audio_hw.c

/*
 * Copyright (C) 2011 The Android Open Source Project
 * Copyright (C) 2012 ARM Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#define LOG_TAG "tiny_hw"
#define LOG_NDEBUG 0

#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <sys/time.h>
#include <stdlib.h>

#include <cutils/log.h>
#include <cutils/str_parms.h>
#include <cutils/properties.h>

#include <hardware/hardware.h>
#include <system/audio.h>
#include <hardware/audio.h>

#include <tinyalsa/asoundlib.h>
#include <audio_utils/resampler.h>
#include <audio_utils/echo_reference.h>
#include <hardware/audio_effect.h>
#include <audio_effects/effect_aec.h>

#ifndef LOGE
/* JellyBean or higher */
#define LOGE ALOGE
#define LOGI ALOGI
#define LOGV ALOGV
#define LOGW ALOGW
#endif

#ifdef AUDIO_DEVICE_API_VERSION_0_0
#define audio_format_t int
#endif

/* Mixer control names Elba */
#define MIXER_MASTER_PLAYBACK_SWITCH		"Master Playback Switch"
#define MIXER_MASTER_PLAYBACK_VOLUME		"Master Playback Volume"

#define MIXER_PCM_PLAYBACK_SWITCH		"PCM Playback Switch"
#define MIXER_PCM_PLAYBACK_VOLUME		"PCM Playback Volume"

#define MIXER_MIC_PLAYBACK_SWITCH		"Mic Playback Switch"
#define MIXER_MIC_PLAYBACK_VOLUME		"Mic Playback Volume"

#define MIXER_MASTER_MONO_PLAYBACK_SWITCH	"Master Mono Playback Switch"
#define MIXER_MASTER_MONO_PLAYBACK_VOLUME	"Master Mono Playback Volume"


/* ALSA card */
#define CARD_ELBA 0

/* ALSA ports for card0 */
#define PORT_CODEC    0 /* CODEC port */

/* Minimum granularity - Arbitrary but small value */
#define CODEC_BASE_FRAME_COUNT 32

/* number of base blocks in a short period (low latency) */
#define PERIOD_MULTIPLIER 32  /* 11 ms */
/* number of frames per short period (low latency) */
#define PERIOD_SIZE (CODEC_BASE_FRAME_COUNT * PERIOD_MULTIPLIER)
/* number of pseudo periods for low latency playback */
#define PLAYBACK_PERIOD_COUNT 4

/* number of periods for capture */
#define CAPTURE_PERIOD_COUNT 2

/* minimum sleep time in out_write() when write threshold is not reached */
#define MIN_WRITE_SLEEP_US	5000

#define RESAMPLER_BUFFER_FRAMES (PERIOD_SIZE * 2)
#define RESAMPLER_BUFFER_SIZE (4 * RESAMPLER_BUFFER_FRAMES)

/* Sampling rate reported to Android */
#define DEFAULT_ANDROID_SAMPLING_RATE 44100

/* sampling rate when using codec port */
#define CODEC_SAMPLING_RATE 48000

/* conversion from % to codec gain */
#define PERC_VOLUME(x) ( (int)((x) * 31 ))

struct pcm_config pcm_config_out = {
	.channels = 2,
	.rate = CODEC_SAMPLING_RATE,
	.period_size = PERIOD_SIZE,
	.period_count = PLAYBACK_PERIOD_COUNT,
	.format = PCM_FORMAT_S16_LE,
};

struct pcm_config pcm_config_in = {
	.channels = 2,
	.rate = CODEC_SAMPLING_RATE,
	.period_size = PERIOD_SIZE,
	.period_count = CAPTURE_PERIOD_COUNT,
	.format = PCM_FORMAT_S16_LE,
};

struct route_setting
{
	char *ctl_name;
	int intval;
	char *strval;
};

/* These are values that never change */
struct route_setting defaults[] = {
	/* general */
	{
		.ctl_name = MIXER_MASTER_PLAYBACK_VOLUME,
		.intval = PERC_VOLUME(1),
	},
	{
		.ctl_name = MIXER_PCM_PLAYBACK_VOLUME,
		.intval = PERC_VOLUME(1),
	},
	{
		.ctl_name = MIXER_MASTER_MONO_PLAYBACK_VOLUME,
		.intval = PERC_VOLUME(1),
	},
	{
		.ctl_name = MIXER_MIC_PLAYBACK_VOLUME,
		.intval = PERC_VOLUME(1),
	},
	{
		.ctl_name = MIXER_MASTER_PLAYBACK_SWITCH,
		.intval = 1,
	},
	{
		.ctl_name = MIXER_PCM_PLAYBACK_SWITCH,
		.intval = 1,
	},
	{
		.ctl_name = MIXER_MASTER_MONO_PLAYBACK_SWITCH,
		.intval = 1,
	},
	{
		.ctl_name = MIXER_MIC_PLAYBACK_SWITCH,
		.intval = 1,
	},
	{
		.ctl_name = NULL,
	},
};


struct mixer_ctls
{
	struct mixer_ctl *mic_volume;
	struct mixer_ctl *pcm_volume;
	struct mixer_ctl *headset_volume;
	struct mixer_ctl *speaker_volume;
	struct mixer_ctl *mic_switch;
	struct mixer_ctl *headset_switch;
	struct mixer_ctl *speaker_switch;
	struct mixer_ctl *LHPMux;
	struct mixer_ctl *RHPMux;
	struct mixer_ctl *SpkMux;
	struct mixer_ctl *HPEnDAC;
	struct mixer_ctl *SpkEnDAC;
};

struct alsa_audio_device {
	struct audio_hw_device hw_device;

	pthread_mutex_t lock;	/* see note below on mutex acquisition order */
	struct mixer *mixer;
	struct mixer_ctls mixer_ctls;
	int mode;
	int devices;
	int in_call;
	struct alsa_stream_in *active_input;
	struct alsa_stream_out *active_output;
	bool mic_mute;
	struct echo_reference_itfe *echo_reference;
};

struct alsa_stream_out {
	struct audio_stream_out stream;

	pthread_mutex_t lock;	/* see note below on mutex acquisition order */
	struct pcm_config config;
	struct pcm *pcm;
	struct resampler_itfe *resampler;
	char *buffer;
	int standby;
	struct echo_reference_itfe *echo_reference;
	struct alsa_audio_device *dev;
	int write_threshold;
#ifdef AUDIO_DEVICE_API_VERSION_1_0
	audio_format_t format;
	uint32_t channels;
	uint32_t sample_rate;
#endif
};

#define MAX_PREPROCESSORS 3 /* maximum one AGC + one NS + one AEC per input stream */

struct alsa_stream_in {
	struct audio_stream_in stream;

	pthread_mutex_t lock;	/* see note below on mutex acquisition order */
	struct pcm_config config;
	struct pcm *pcm;
	int device;
	struct resampler_itfe *resampler;
	struct resampler_buffer_provider buf_provider;
	int16_t *buffer;
	size_t frames_in;
	unsigned int requested_rate;	/* the android requested sample rate */
	int standby;
	int source;
	struct echo_reference_itfe *echo_reference;
	bool need_echo_reference;
	effect_handle_t preprocessors[MAX_PREPROCESSORS];
	int num_preprocessors;
	int16_t *proc_buf;
	size_t proc_buf_size;
	size_t proc_frames_in;
	int16_t *ref_buf;
	size_t ref_buf_size;
	size_t ref_frames_in;
	int read_status;

	struct alsa_audio_device *dev;
};

/**
 * NOTE: when multiple mutexes have to be acquired, always respect the
 * following order:	hw device > in stream > out stream
 */

static int adev_set_voice_volume(struct audio_hw_device *dev, float volume);
static int do_input_standby(struct alsa_stream_in *in);
static int do_output_standby(struct alsa_stream_out *out);

/* The enable flag when 0 makes the assumption that enums are disabled by
 * "Off" and integers/booleans by 0 */
static int set_route_by_array(struct mixer *mixer, struct route_setting *route,
			int enable)
{
	struct mixer_ctl *ctl;
	unsigned int i, j;

	/* Go through the route array and set each value */
	i = 0;
	while (route[i].ctl_name) {
		ctl = mixer_get_ctl_by_name(mixer, route[i].ctl_name);
		if (!ctl)
			return -EINVAL;

		if (route[i].strval) {
			if (enable)
				mixer_ctl_set_enum_by_string(ctl, route[i].strval);
			else
				mixer_ctl_set_enum_by_string(ctl, "Off");
		} else {
			/* This ensures multiple (i.e. stereo) values are set jointly */
			for (j = 0; j < mixer_ctl_get_num_values(ctl); j++) {
				if (enable)
					mixer_ctl_set_value(ctl, j, route[i].intval);
				else
					mixer_ctl_set_value(ctl, j, 0);
			}
		}
		i++;
	}

	return 0;
}

static void force_all_standby(struct alsa_audio_device *adev)
{
	struct alsa_stream_in *in;
	struct alsa_stream_out *out;

	if (adev->active_output) {
		out = adev->active_output;
		pthread_mutex_lock(&out->lock);
		do_output_standby(out);
		pthread_mutex_unlock(&out->lock);
	}

	if (adev->active_input) {
		in = adev->active_input;
		pthread_mutex_lock(&in->lock);
		do_input_standby(in);
		pthread_mutex_unlock(&in->lock);
	}
}

/* alsa Example: Tipically the device is in MODE_NORMAL. When you receive a call
 * MODE_RINGTONE and when you engage in a call MODE_IN_CALL. In MODE_NORMAL the
 * output is routed to speakers or headset.
 */
static void select_mode(struct alsa_audio_device *adev)
{

	if (adev->mode == AUDIO_MODE_IN_CALL) {
		LOGI("Entering IN_CALL state, in_call=%d", adev->in_call);
		if (!adev->in_call) {
			force_all_standby(adev);
			adev->in_call = 1;
		}
	} else {
		LOGI("Leaving IN_CALL state, in_call=%d, mode=%d",
			adev->in_call, adev->mode);
		if (adev->in_call) {
			adev->in_call = 0;
			force_all_standby(adev);
		}
	}
}

/* must be called with hw device and output stream mutexes locked */
static int start_output_stream(struct alsa_stream_out *out)
{
	struct alsa_audio_device *adev = out->dev;
	unsigned int card = CARD_ELBA;
	unsigned int port = PORT_CODEC;

	adev->active_output = out;

	/* default to low power: will be corrected in out_write if necessary before first write to
	 * tinyalsa.
	 */
	out->write_threshold = PLAYBACK_PERIOD_COUNT * PERIOD_SIZE;
	out->config.start_threshold = PERIOD_SIZE * 2;
	out->config.avail_min = PERIOD_SIZE;

	out->pcm = pcm_open(card, port, PCM_OUT | PCM_MMAP | PCM_NOIRQ, &out->config);

	if (!pcm_is_ready(out->pcm)) {
		LOGE("cannot open pcm_out driver: %s", pcm_get_error(out->pcm));
		pcm_close(out->pcm);
		adev->active_output = NULL;
		return -ENOMEM;
	}

	if (adev->echo_reference != NULL)
		out->echo_reference = adev->echo_reference;

	out->resampler->reset(out->resampler);

	return 0;
}

/* fails if the parameters are not in range */
static int check_input_parameters(uint32_t sample_rate, int format, int channel_count)
{
	if (format != AUDIO_FORMAT_PCM_16_BIT)
		return -EINVAL;

	if ((channel_count < 1) || (channel_count > 2))
		return -EINVAL;

	switch(sample_rate) {
	case 8000:
	case 11025:
	case 16000:
	case 22050:
	case 24000:
	case 32000:
	case 44100:
	case 48000:
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

/* Returns audio input buffer size according to parameters passed or
 * 0 if one of the parameters is not supported
 */
static size_t get_input_buffer_size(uint32_t sample_rate, int format, int channel_count)
{
	size_t size;

	if (check_input_parameters(sample_rate, format, channel_count) != 0)
		return 0;

	/* take resampling into account and return the closest majoring
	   multiple of 16 frames, as audioflinger expects audio buffers to
	   be a multiple of 16 frames */
	size = (pcm_config_in.period_size * sample_rate) / pcm_config_in.rate;
	size = ((size + 15) / 16) * 16;

	return size * channel_count * sizeof(short);
}

static void add_echo_reference(struct alsa_stream_out *out,
			struct echo_reference_itfe *reference)
{
	pthread_mutex_lock(&out->lock);
	out->echo_reference = reference;
	pthread_mutex_unlock(&out->lock);
}

static void remove_echo_reference(struct alsa_stream_out *out,
				struct echo_reference_itfe *reference)
{
	pthread_mutex_lock(&out->lock);
	if (out->echo_reference == reference) {
		/* stop writing to echo reference */
		reference->write(reference, NULL);
		out->echo_reference = NULL;
	}
	pthread_mutex_unlock(&out->lock);
}

static void put_echo_reference(struct alsa_audio_device *adev,
			struct echo_reference_itfe *reference)
{
	if (adev->echo_reference != NULL &&
		reference == adev->echo_reference) {
		if (adev->active_output != NULL)
			remove_echo_reference(adev->active_output, reference);
		release_echo_reference(reference);
		adev->echo_reference = NULL;
	}
}

static struct echo_reference_itfe *get_echo_reference(struct alsa_audio_device *adev,
						audio_format_t format,
						uint32_t channel_count,
						uint32_t sampling_rate)
{
	put_echo_reference(adev, adev->echo_reference);
	if (adev->active_output != NULL) {
		struct audio_stream *stream = &adev->active_output->stream.common;
		uint32_t wr_channel_count = popcount(stream->get_channels(stream));
		uint32_t wr_sampling_rate = stream->get_sample_rate(stream);

		int status = create_echo_reference(AUDIO_FORMAT_PCM_16_BIT,
						channel_count,
						sampling_rate,
						AUDIO_FORMAT_PCM_16_BIT,
						wr_channel_count,
						wr_sampling_rate,
						&adev->echo_reference);
		if (status == 0)
			add_echo_reference(adev->active_output, adev->echo_reference);
	}
	return adev->echo_reference;
}

static int get_playback_delay(struct alsa_stream_out *out,
			size_t frames,
			struct echo_reference_buffer *buffer)
{
	size_t kernel_frames;
	int status;

	status = pcm_get_htimestamp(out->pcm, &kernel_frames, &buffer->time_stamp);
	if (status < 0) {
		buffer->time_stamp.tv_sec  = 0;
		buffer->time_stamp.tv_nsec = 0;
		buffer->delay_ns	   = 0;
		LOGV("get_playback_delay(): pcm_get_htimestamp error,"
			"setting playbackTimestamp to 0");
		return status;
	}

	kernel_frames = pcm_get_buffer_size(out->pcm) - kernel_frames;

	/* adjust render time stamp with delay added by current driver buffer.
	 * Add the duration of current frame as we want the render time of the last
	 * sample being written. */
	buffer->delay_ns = (long)(((int64_t)(kernel_frames + frames)* 1000000000)/
				CODEC_SAMPLING_RATE);

	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t out_get_sample_rate(const struct audio_stream *stream)
{
	return DEFAULT_ANDROID_SAMPLING_RATE;
}

/* interface libhardware/include/hardware/audio.h */
static int out_set_sample_rate(struct audio_stream *stream, uint32_t rate)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static size_t out_get_buffer_size(const struct audio_stream *stream)
{
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;

	/* take resampling into account and return the closest majoring
	   multiple of 16 frames, as audioflinger expects audio buffers to
	   be a multiple of 16 frames */
	size_t size = (PERIOD_SIZE * DEFAULT_ANDROID_SAMPLING_RATE) / out->config.rate;
	size = ((size + 15) / 16) * 16;
	return size * audio_stream_frame_size((struct audio_stream *)stream);
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t out_get_channels(const struct audio_stream *stream)
{
	return AUDIO_CHANNEL_OUT_STEREO;
}

/* interface libhardware/include/hardware/audio.h */
static audio_format_t out_get_format(const struct audio_stream *stream)
{
	return AUDIO_FORMAT_PCM_16_BIT;
}

/* interface libhardware/include/hardware/audio.h */
static int out_set_format(struct audio_stream *stream, audio_format_t format)
{
	return 0;
}

/*Adam Example: must be called with hw device and output stream mutexes locked */
static int do_output_standby(struct alsa_stream_out *out)
{
	struct alsa_audio_device *adev = out->dev;

	if (!out->standby) {
		pcm_close(out->pcm);
		out->pcm = NULL;

		adev->active_output = 0;

		/* stop writing to echo reference */
		if (out->echo_reference != NULL) {
			out->echo_reference->write(out->echo_reference, NULL);
			out->echo_reference = NULL;
		}

		out->standby = 1;
	}
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int out_standby(struct audio_stream *stream)
{
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;
	int status;

	pthread_mutex_lock(&out->dev->lock);
	pthread_mutex_lock(&out->lock);
	status = do_output_standby(out);
	pthread_mutex_unlock(&out->lock);
	pthread_mutex_unlock(&out->dev->lock);
	return status;
}

/* interface libhardware/include/hardware/audio.h */
static int out_dump(const struct audio_stream *stream, int fd)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int out_set_parameters(struct audio_stream *stream, const char *kvpairs)
{
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;
	struct alsa_audio_device *adev = out->dev;
	struct alsa_stream_in *in;
	struct str_parms *parms;
	char *str;
	char value[32];
	int ret, val = 0;

	parms = str_parms_create_str(kvpairs);

	ret = str_parms_get_str(parms, AUDIO_PARAMETER_STREAM_ROUTING, value, sizeof(value));
	if (ret >= 0) {
		val = atoi(value);
		pthread_mutex_lock(&adev->lock);
		pthread_mutex_lock(&out->lock);
		if (((adev->devices & AUDIO_DEVICE_OUT_ALL) != val) && (val != 0)) {
			adev->devices &= ~AUDIO_DEVICE_OUT_ALL;
			adev->devices |= val;
		}
		pthread_mutex_unlock(&out->lock);
		pthread_mutex_unlock(&adev->lock);
	}

	str_parms_destroy(parms);
	return ret;
}

/* interface libhardware/include/hardware/audio.h */
static char * out_get_parameters(const struct audio_stream *stream, const char *keys)
{
	return strdup("");
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t out_get_latency(const struct audio_stream_out *stream)
{
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;

	return (PERIOD_SIZE * PLAYBACK_PERIOD_COUNT * 1000) / out->config.rate;
}

/* interface libhardware/include/hardware/audio.h */
static int out_set_volume(struct audio_stream_out *stream, float left,
			float right)
{
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;
	struct alsa_audio_device *adev = out->dev;

	mixer_ctl_set_value(adev->mixer_ctls.speaker_volume, 0,
			PERC_VOLUME(left));
	mixer_ctl_set_value(adev->mixer_ctls.speaker_volume, 1,
			PERC_VOLUME(right));

	mixer_ctl_set_value(adev->mixer_ctls.headset_volume, 0,
			PERC_VOLUME(left));
	mixer_ctl_set_value(adev->mixer_ctls.headset_volume, 1,
			PERC_VOLUME(right));

	return 0;
}

/* interface libhardware/include/hardware/audio.h
 */
static ssize_t out_write(struct audio_stream_out *stream, const void* buffer,
			size_t bytes)
{
	int ret;
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;
	struct alsa_audio_device *adev = out->dev;
	size_t frame_size = audio_stream_frame_size(&out->stream.common);
	size_t in_frames = bytes / frame_size;
	size_t out_frames = RESAMPLER_BUFFER_SIZE / frame_size;
	struct alsa_stream_in *in;
	int kernel_frames;
	void *buf;

	/* acquiring hw device mutex systematically is useful if a low priority thread is waiting
	 * on the output stream mutex - e.g. executing select_mode() while holding the hw device
	 * mutex
	 */
	pthread_mutex_lock(&adev->lock);
	pthread_mutex_lock(&out->lock);
	if (out->standby) {
		ret = start_output_stream(out);
		if (ret != 0) {
			pthread_mutex_unlock(&adev->lock);
			goto exit;
		}
		out->standby = 0;
	}

	pthread_mutex_unlock(&adev->lock);

	/* only use resampler if required */
	if (out->config.rate != DEFAULT_ANDROID_SAMPLING_RATE) {
		out->resampler->resample_from_input(out->resampler,
						(int16_t *)buffer,
						&in_frames,
						(int16_t *)out->buffer,
						&out_frames);
		buf = out->buffer;
	} else {
		out_frames = in_frames;
		buf = (void *)buffer;
	}
	if (out->echo_reference != NULL) {
		struct echo_reference_buffer b;
		b.raw = (void *)buffer;
		b.frame_count = in_frames;

		get_playback_delay(out, out_frames, &b);
		out->echo_reference->write(out->echo_reference, &b);
	}

	/* do not allow more than out->write_threshold frames in kernel pcm driver buffer */
	do {
		struct timespec time_stamp;

		if (pcm_get_htimestamp(out->pcm, (unsigned int *)&kernel_frames, &time_stamp) < 0)
			break;
		kernel_frames = pcm_get_buffer_size(out->pcm) - kernel_frames;

		if (kernel_frames > out->write_threshold) {
			unsigned long time = (unsigned long)
				(((int64_t)(kernel_frames - out->write_threshold) * 1000000) /
					CODEC_SAMPLING_RATE);
			if (time < MIN_WRITE_SLEEP_US)
				time = MIN_WRITE_SLEEP_US;
			usleep(time);
		}
	} while (kernel_frames > out->write_threshold);

	ret = pcm_mmap_write(out->pcm, (void *)buf, out_frames * frame_size);

exit:
	pthread_mutex_unlock(&out->lock);

	if (ret != 0) {
		usleep(bytes * 1000000 / audio_stream_frame_size(&stream->common) /
			out_get_sample_rate(&stream->common));
	}

	return bytes;
}

/* interface libhardware/include/hardware/audio.h */
static int out_get_render_position(const struct audio_stream_out *stream,
				uint32_t *dsp_frames)
{
	return -EINVAL;
}

/* interface libhardware/include/hardware/audio.h */
static int out_add_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int out_remove_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
{
	return 0;
}

/** audio_stream_in implementation **/

/* must be called with hw device and input stream mutexes locked */
static int start_input_stream(struct alsa_stream_in *in)
{
	int ret = 0;
	struct alsa_audio_device *adev = in->dev;

	adev->active_input = in;

	if (adev->mode != AUDIO_MODE_IN_CALL) {
		adev->devices &= ~AUDIO_DEVICE_IN_ALL;
		adev->devices |= in->device;
	}

	if (in->need_echo_reference && in->echo_reference == NULL)
		in->echo_reference = get_echo_reference(adev,
							AUDIO_FORMAT_PCM_16_BIT,
							in->config.channels,
							in->requested_rate);

	/* this assumes routing is done previously */
	in->pcm = pcm_open(0, PORT_CODEC, PCM_IN, &in->config);
	if (!pcm_is_ready(in->pcm)) {
		LOGE("cannot open pcm_in driver: %s", pcm_get_error(in->pcm));
		pcm_close(in->pcm);
		adev->active_input = NULL;
		return -ENOMEM;
	}

	/* if no supported sample rate is available, use the resampler */
	if (in->resampler) {
		in->resampler->reset(in->resampler);
		in->frames_in = 0;
	}
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t in_get_sample_rate(const struct audio_stream *stream)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;

	return in->requested_rate;
}

/* interface libhardware/include/hardware/audio.h */
static int in_set_sample_rate(struct audio_stream *stream, uint32_t rate)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static size_t in_get_buffer_size(const struct audio_stream *stream)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;

	return get_input_buffer_size(in->requested_rate,
				AUDIO_FORMAT_PCM_16_BIT,
				in->config.channels);
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t in_get_channels(const struct audio_stream *stream)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;

	if (in->config.channels == 1) {
		return AUDIO_CHANNEL_IN_MONO;
	} else {
		return AUDIO_CHANNEL_IN_STEREO;
	}
}

/* interface libhardware/include/hardware/audio.h */
static int in_get_format(const struct audio_stream *stream)
{
	return AUDIO_FORMAT_PCM_16_BIT;
}

/* interface libhardware/include/hardware/audio.h */
static int in_set_format(struct audio_stream *stream, int format)
{
	return 0;
}

/* must be called with hw device and input stream mutexes locked */
static int do_input_standby(struct alsa_stream_in *in)
{
	struct alsa_audio_device *adev = in->dev;

	if (!in->standby) {
		pcm_close(in->pcm);
		in->pcm = NULL;

		adev->active_input = 0;
		if (adev->mode != AUDIO_MODE_IN_CALL) {
			adev->devices &= ~AUDIO_DEVICE_IN_ALL;
		}

		if (in->echo_reference != NULL) {
			/* stop reading from echo reference */
			in->echo_reference->read(in->echo_reference, NULL);
			put_echo_reference(adev, in->echo_reference);
			in->echo_reference = NULL;
		}

		in->standby = 1;
	}
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int in_standby(struct audio_stream *stream)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;
	int status;

	pthread_mutex_lock(&in->dev->lock);
	pthread_mutex_lock(&in->lock);
	status = do_input_standby(in);
	pthread_mutex_unlock(&in->lock);
	pthread_mutex_unlock(&in->dev->lock);
	return status;
}

/* interface libhardware/include/hardware/audio.h */
static int in_dump(const struct audio_stream *stream, int fd)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int in_set_parameters(struct audio_stream *stream, const char *kvpairs)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;
	struct alsa_audio_device *adev = in->dev;
	struct str_parms *parms;
	char *str;
	char value[32];
	int ret, val = 0;
	bool do_standby = false;

	parms = str_parms_create_str(kvpairs);

	ret = str_parms_get_str(parms, AUDIO_PARAMETER_STREAM_INPUT_SOURCE, value, sizeof(value));

	pthread_mutex_lock(&adev->lock);
	pthread_mutex_lock(&in->lock);
	if (ret >= 0) {
		val = atoi(value);
		/* no audio source uses val == 0 */
		if ((in->source != val) && (val != 0)) {
			in->source = val;
			do_standby = true;
		}
	}

	ret = str_parms_get_str(parms, AUDIO_PARAMETER_STREAM_ROUTING, value, sizeof(value));
	if (ret >= 0) {
		val = atoi(value);
		if ((in->device != val) && (val != 0)) {
			in->device = val;
			do_standby = true;
		}
	}

	if (do_standby)
		do_input_standby(in);
	pthread_mutex_unlock(&in->lock);
	pthread_mutex_unlock(&adev->lock);

	str_parms_destroy(parms);
	return ret;
}

/* interface libhardware/include/hardware/audio.h */
static char * in_get_parameters(const struct audio_stream *stream,
				const char *keys)
{
	return strdup("");
}

/* interface libhardware/include/hardware/audio.h */
static int in_set_gain(struct audio_stream_in *stream, float gain)
{
	return 0;
}

static void get_capture_delay(struct alsa_stream_in *in,
			size_t frames,
			struct echo_reference_buffer *buffer)
{

	/* read frames available in kernel driver buffer */
	size_t kernel_frames;
	struct timespec tstamp;
	long buf_delay;
	long rsmp_delay;
	long kernel_delay;
	long delay_ns;

	if (pcm_get_htimestamp(in->pcm, &kernel_frames, &tstamp) < 0) {
		buffer->time_stamp.tv_sec  = 0;
		buffer->time_stamp.tv_nsec = 0;
		buffer->delay_ns	   = 0;
		LOGW("read get_capture_delay(): pcm_htimestamp error");
		return;
	}

	/* read frames available in audio HAL input buffer
	 * add number of frames being read as we want the capture time of first sample
	 * in current buffer */
	buf_delay = (long)(((int64_t)(in->frames_in + in->proc_frames_in) * 1000000000)
			/ in->config.rate);
	/* add delay introduced by resampler */
	rsmp_delay = 0;
	if (in->resampler) {
		rsmp_delay = in->resampler->delay_ns(in->resampler);
	}

	kernel_delay = (long)(((int64_t)kernel_frames * 1000000000) / in->config.rate);

	delay_ns = kernel_delay + buf_delay + rsmp_delay;

	buffer->time_stamp = tstamp;
	buffer->delay_ns   = delay_ns;
	LOGV("get_capture_delay time_stamp = [%ld].[%ld], delay_ns: [%d],"
		" kernel_delay:[%ld], buf_delay:[%ld], rsmp_delay:[%ld], kernel_frames:[%d], "
		"in->frames_in:[%d], in->proc_frames_in:[%d], frames:[%d]",
		buffer->time_stamp.tv_sec , buffer->time_stamp.tv_nsec, buffer->delay_ns,
		kernel_delay, buf_delay, rsmp_delay, kernel_frames,
		in->frames_in, in->proc_frames_in, frames);

}

static int32_t update_echo_reference(struct alsa_stream_in *in, size_t frames)
{
	struct echo_reference_buffer b;
	b.delay_ns = 0;

	LOGV("update_echo_reference, frames = [%d], in->ref_frames_in = [%d],  "
		"b.frame_count = [%d]",
		frames, in->ref_frames_in, frames - in->ref_frames_in);
	if (in->ref_frames_in < frames) {
		if (in->ref_buf_size < frames) {
			in->ref_buf_size = frames;
			in->ref_buf = (int16_t *)realloc(in->ref_buf,
							in->ref_buf_size *
							in->config.channels * sizeof(int16_t));
		}

		b.frame_count = frames - in->ref_frames_in;
		b.raw = (void *)(in->ref_buf + in->ref_frames_in * in->config.channels);

		get_capture_delay(in, frames, &b);

		if (in->echo_reference->read(in->echo_reference, &b) == 0)
		{
			in->ref_frames_in += b.frame_count;
			LOGV("update_echo_reference: in->ref_frames_in:[%d], "
				"in->ref_buf_size:[%d], frames:[%d], b.frame_count:[%d]",
				in->ref_frames_in, in->ref_buf_size, frames, b.frame_count);
		}
	} else
		LOGW("update_echo_reference: NOT enough frames to read ref buffer");
	return b.delay_ns;
}

static int set_preprocessor_param(effect_handle_t handle,
				effect_param_t *param)
{
	uint32_t size = sizeof(int);
	uint32_t psize = ((param->psize - 1) / sizeof(int) + 1) * sizeof(int) +
		param->vsize;

	int status = (*handle)->command(handle,
					EFFECT_CMD_SET_PARAM,
					sizeof (effect_param_t) + psize,
					param,
					&size,
					&param->status);
	if (status == 0)
		status = param->status;

	return status;
}

static int set_preprocessor_echo_delay(effect_handle_t handle,
				int32_t delay_us)
{
	return 0;
}

static void push_echo_reference(struct alsa_stream_in *in, size_t frames)
{
	/* read frames from echo reference buffer and update echo delay
	 * in->ref_frames_in is updated with frames available in in->ref_buf */
	int32_t delay_us = update_echo_reference(in, frames)/1000;
	int i;
	audio_buffer_t buf;

	if (in->ref_frames_in < frames)
		frames = in->ref_frames_in;

	buf.frameCount = frames;
	buf.raw = in->ref_buf;

	for (i = 0; i < in->num_preprocessors; i++) {
		if ((*in->preprocessors[i])->process_reverse == NULL)
			continue;

		(*in->preprocessors[i])->process_reverse(in->preprocessors[i],
							&buf,
							NULL);
		set_preprocessor_echo_delay(in->preprocessors[i], delay_us);
	}

	in->ref_frames_in -= buf.frameCount;
	if (in->ref_frames_in) {
		memcpy(in->ref_buf,
			in->ref_buf + buf.frameCount * in->config.channels,
			in->ref_frames_in * in->config.channels * sizeof(int16_t));
	}
}

static int get_next_buffer(struct resampler_buffer_provider *buffer_provider,
			struct resampler_buffer* buffer)
{
	struct alsa_stream_in *in;

	if (buffer_provider == NULL || buffer == NULL)
		return -EINVAL;

	in = (struct alsa_stream_in *)((char *)buffer_provider -
				offsetof(struct alsa_stream_in, buf_provider));

	if (in->pcm == NULL) {
		buffer->raw = NULL;
		buffer->frame_count = 0;
		in->read_status = -ENODEV;
		return -ENODEV;
	}

	if (in->frames_in == 0) {
		in->read_status = pcm_read(in->pcm,
					(void*)in->buffer,
					in->config.period_size *
					audio_stream_frame_size(&in->stream.common));
		if (in->read_status != 0) {
			LOGE("get_next_buffer() pcm_read error %d", in->read_status);
			buffer->raw = NULL;
			buffer->frame_count = 0;
			return in->read_status;
		}
		in->frames_in = in->config.period_size;
	}

	buffer->frame_count = (buffer->frame_count > in->frames_in) ?
		in->frames_in : buffer->frame_count;
	buffer->i16 = in->buffer + (in->config.period_size - in->frames_in) *
		in->config.channels;

	return in->read_status;

}

static void release_buffer(struct resampler_buffer_provider *buffer_provider,
			struct resampler_buffer* buffer)
{
	struct alsa_stream_in *in;

	if (buffer_provider == NULL || buffer == NULL)
		return;

	in = (struct alsa_stream_in *)((char *)buffer_provider -
				offsetof(struct alsa_stream_in, buf_provider));

	in->frames_in -= buffer->frame_count;
}

/* read_frames() reads frames from kernel driver, down samples to capture rate
 * if necessary and output the number of frames requested to the buffer specified */
static ssize_t read_frames(struct alsa_stream_in *in, void *buffer, ssize_t frames)
{
	ssize_t frames_wr = 0;

	while (frames_wr < frames) {
		size_t frames_rd = frames - frames_wr;
		if (in->resampler != NULL) {
			in->resampler->resample_from_provider(in->resampler,
							(int16_t *)((char *)buffer +
								frames_wr * audio_stream_frame_size(&in->stream.common)),
							&frames_rd);
		} else {
			struct resampler_buffer buf = {
				{ raw : NULL, },
				frame_count : frames_rd,
			};
			get_next_buffer(&in->buf_provider, &buf);
			if (buf.raw != NULL) {
				memcpy((char *)buffer +
					frames_wr * audio_stream_frame_size(&in->stream.common),
					buf.raw,
					buf.frame_count * audio_stream_frame_size(&in->stream.common));
				frames_rd = buf.frame_count;
			}
			release_buffer(&in->buf_provider, &buf);
		}
		/* in->read_status is updated by getNextBuffer() also called by
		 * in->resampler->resample_from_provider() */
		if (in->read_status != 0)
			return in->read_status;

		frames_wr += frames_rd;
	}
	return frames_wr;
}

/* process_frames() reads frames from kernel driver (via read_frames()),
 * calls the active audio pre processings and output the number of frames requested
 * to the buffer specified */
static ssize_t process_frames(struct alsa_stream_in *in, void* buffer, ssize_t frames)
{
	ssize_t frames_wr = 0;
	audio_buffer_t in_buf;
	audio_buffer_t out_buf;
	int i;

	while (frames_wr < frames) {
		/* first reload enough frames at the end of process input buffer */
		if (in->proc_frames_in < (size_t)frames) {
			ssize_t frames_rd;

			if (in->proc_buf_size < (size_t)frames) {
				in->proc_buf_size = (size_t)frames;
				in->proc_buf = (int16_t *)realloc(in->proc_buf,
								in->proc_buf_size *
								in->config.channels * sizeof(int16_t));
				LOGV("process_frames(): in->proc_buf %p size extended to %d frames",
					in->proc_buf, in->proc_buf_size);
			}
			frames_rd = read_frames(in,
						in->proc_buf +
						in->proc_frames_in * in->config.channels,
						frames - in->proc_frames_in);
			if (frames_rd < 0) {
				frames_wr = frames_rd;
				break;
			}
			in->proc_frames_in += frames_rd;
		}

		if (in->echo_reference != NULL)
			push_echo_reference(in, in->proc_frames_in);

		/* in_buf.frameCount and out_buf.frameCount indicate respectively
		 * the maximum number of frames to be consumed and produced by process() */
		in_buf.frameCount = in->proc_frames_in;
		in_buf.s16 = in->proc_buf;
		out_buf.frameCount = frames - frames_wr;
		out_buf.s16 = (int16_t *)buffer + frames_wr * in->config.channels;

		for (i = 0; i < in->num_preprocessors; i++)
			(*in->preprocessors[i])->process(in->preprocessors[i],
							&in_buf,
							&out_buf);

		/* process() has updated the number of frames consumed and produced in
		 * in_buf.frameCount and out_buf.frameCount respectively
		 * move remaining frames to the beginning of in->proc_buf */
		in->proc_frames_in -= in_buf.frameCount;
		if (in->proc_frames_in) {
			memcpy(in->proc_buf,
				in->proc_buf + in_buf.frameCount * in->config.channels,
				in->proc_frames_in * in->config.channels * sizeof(int16_t));
		}

		/* if not enough frames were passed to process(), read more and retry. */
		if (out_buf.frameCount == 0)
			continue;

		frames_wr += out_buf.frameCount;
	}
	return frames_wr;
}

/* interface libhardware/include/hardware/audio.h */
static ssize_t in_read(struct audio_stream_in *stream, void* buffer,
		size_t bytes)
{
	int ret = 0;
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;
	struct alsa_audio_device *adev = in->dev;
	size_t frames_rq = bytes / audio_stream_frame_size(&stream->common);

	/* acquiring hw device mutex systematically is useful if a low priority thread is waiting
	 * on the input stream mutex - e.g. executing select_mode() while holding the hw device
	 * mutex
	 */
	pthread_mutex_lock(&adev->lock);
	pthread_mutex_lock(&in->lock);
	if (in->standby) {
		ret = start_input_stream(in);
		if (ret == 0)
			in->standby = 0;
	}
	pthread_mutex_unlock(&adev->lock);

	if (ret < 0)
		goto exit;

	if (in->num_preprocessors != 0)
		ret = process_frames(in, buffer, frames_rq);
	else if (in->resampler != NULL)
		ret = read_frames(in, buffer, frames_rq);
	else
		ret = pcm_read(in->pcm, buffer, bytes);

	if (ret > 0)
		ret = 0;

	if (ret == 0 && adev->mic_mute)
		memset(buffer, 0, bytes);

exit:
	if (ret < 0)
		usleep(bytes * 1000000 / audio_stream_frame_size(&stream->common) /
			in_get_sample_rate(&stream->common));

	pthread_mutex_unlock(&in->lock);
	return bytes;
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t in_get_input_frames_lost(struct audio_stream_in *stream)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int in_add_audio_effect(const struct audio_stream *stream,
			effect_handle_t effect)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;
	int status;
	effect_descriptor_t desc;

	pthread_mutex_lock(&in->dev->lock);
	pthread_mutex_lock(&in->lock);
	if (in->num_preprocessors >= MAX_PREPROCESSORS) {
		status = -ENOSYS;
		goto exit;
	}

	status = (*effect)->get_descriptor(effect, &desc);
	if (status != 0)
		goto exit;

	in->preprocessors[in->num_preprocessors++] = effect;

	if (memcmp(&desc.type, FX_IID_AEC, sizeof(effect_uuid_t)) == 0) {
		in->need_echo_reference = true;
		do_input_standby(in);
	}

exit:

	pthread_mutex_unlock(&in->lock);
	pthread_mutex_unlock(&in->dev->lock);
	return status;
}

/* interface libhardware/include/hardware/audio.h */
static int in_remove_audio_effect(const struct audio_stream *stream,
				effect_handle_t effect)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;
	int i;
	int status = -EINVAL;
	bool found = false;
	effect_descriptor_t desc;

	pthread_mutex_lock(&in->dev->lock);
	pthread_mutex_lock(&in->lock);
	if (in->num_preprocessors <= 0) {
		status = -ENOSYS;
		goto exit;
	}

	for (i = 0; i < in->num_preprocessors; i++) {
		if (found) {
			in->preprocessors[i - 1] = in->preprocessors[i];
			continue;
		}
		if (in->preprocessors[i] == effect) {
			in->preprocessors[i] = NULL;
			status = 0;
			found = true;
		}
	}

	if (status != 0)
		goto exit;

	in->num_preprocessors--;

	status = (*effect)->get_descriptor(effect, &desc);
	if (status != 0)
		goto exit;
	if (memcmp(&desc.type, FX_IID_AEC, sizeof(effect_uuid_t)) == 0) {
		in->need_echo_reference = false;
		do_input_standby(in);
	}

exit:

	pthread_mutex_unlock(&in->lock);
	pthread_mutex_unlock(&in->dev->lock);
	return status;
}

/* interface libhardware/include/hardware/audio.h */
#ifdef AUDIO_DEVICE_API_VERSION_1_0
static int adev_open_output_stream(struct audio_hw_device *dev,
				audio_io_handle_t handle,
				audio_devices_t devices,
				audio_output_flags_t flags,
				struct audio_config *config,
				struct audio_stream_out **stream_out)
#else
	static int adev_open_output_stream(struct audio_hw_device *dev,
					uint32_t devices, int *format,
					uint32_t *channels, uint32_t *sample_rate,
					struct audio_stream_out **stream_out)
#endif
{
	struct alsa_audio_device *ladev = (struct alsa_audio_device *)dev;
	struct alsa_stream_out *out;
	int ret = 0;

	out = (struct alsa_stream_out *)calloc(1, sizeof(struct alsa_stream_out));
	if (!out)
		return -ENOMEM;

	ret = create_resampler(DEFAULT_ANDROID_SAMPLING_RATE,
			CODEC_SAMPLING_RATE,
			2,
			RESAMPLER_QUALITY_DEFAULT,
			NULL,
			&out->resampler);
	if (ret != 0)
		goto err_open;
	out->buffer = malloc(RESAMPLER_BUFFER_SIZE); /* todo: allow for reallocing */

	out->stream.common.get_sample_rate = out_get_sample_rate;
	out->stream.common.set_sample_rate = out_set_sample_rate;
	out->stream.common.get_buffer_size = out_get_buffer_size;
	out->stream.common.get_channels = out_get_channels;
	out->stream.common.get_format = out_get_format;
	out->stream.common.set_format = out_set_format;
	out->stream.common.standby = out_standby;
	out->stream.common.dump = out_dump;
	out->stream.common.set_parameters = out_set_parameters;
	out->stream.common.get_parameters = out_get_parameters;
	out->stream.common.add_audio_effect = out_add_audio_effect;
	out->stream.common.remove_audio_effect = out_remove_audio_effect;
	out->stream.get_latency = out_get_latency;
	out->stream.set_volume = out_set_volume;
	out->stream.write = out_write;
	out->stream.get_render_position = out_get_render_position;

	/* adev_open_input_stream() */
	memcpy(&out->config, &pcm_config_out, sizeof(pcm_config_out));

	out->dev = ladev;
	out->standby = 1;

	/* FIXME: when we support multiple output devices, we will want to
	 * do the following:
	 * adev->devices &= ~AUDIO_DEVICE_OUT_ALL;
	 * adev->devices |= out->device;
	 * This is because out_set_parameters() with a route is not
	 * guaranteed to be called after an output stream is opened. */

#ifdef AUDIO_DEVICE_API_VERSION_1_0
	config->format = out_get_format(&out->stream.common);
	config->channel_mask = out_get_channels(&out->stream.common);
	config->sample_rate = out_get_sample_rate(&out->stream.common);
#else
	*format = out_get_format(&out->stream.common);
	*channels = out_get_channels(&out->stream.common);
	*sample_rate = out_get_sample_rate(&out->stream.common);
#endif

	*stream_out = &out->stream;

	return 0;

err_open:
	free(out);
	*stream_out = NULL;
	return ret;
}

/* interface libhardware/include/hardware/audio.h */
static void adev_close_output_stream(struct audio_hw_device *dev,
				struct audio_stream_out *stream)
{
	struct alsa_stream_out *out = (struct alsa_stream_out *)stream;

	out_standby(&stream->common);
	if (out->buffer)
		free(out->buffer);
	if (out->resampler)
		release_resampler(out->resampler);
	free(stream);
}

/* interface libhardware/include/hardware/audio.h */
static int adev_set_parameters(struct audio_hw_device *dev, const char *kvpairs)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static char * adev_get_parameters(const struct audio_hw_device *dev,
				const char *keys)
{
	return strdup("");
}

/* interface libhardware/include/hardware/audio.h */
static int adev_init_check(const struct audio_hw_device *dev)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_set_voice_volume(struct audio_hw_device *dev, float volume)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_set_master_volume(struct audio_hw_device *dev, float volume)
{
	struct alsa_audio_device *adev = (struct alsa_audio_device *)dev;
	int ret=0;

	ret=mixer_ctl_set_value(adev->mixer_ctls.pcm_volume, 0,
				PERC_VOLUME(volume));
	if(ret != 0)
		goto exit;
	ret=mixer_ctl_set_value(adev->mixer_ctls.pcm_volume, 1,
				PERC_VOLUME(volume));
	if(ret != 0)
		goto exit;

	return ret;

exit:
	return -ENOSYS;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_set_mode(struct audio_hw_device *dev, int mode)
{
	struct alsa_audio_device *adev = (struct alsa_audio_device *)dev;

	pthread_mutex_lock(&adev->lock);
	if (adev->mode != mode) {
		adev->mode = mode;
		select_mode(adev);
	}
	pthread_mutex_unlock(&adev->lock);

	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_set_mic_mute(struct audio_hw_device *dev, bool state)
{
	struct alsa_audio_device *adev = (struct alsa_audio_device *)dev;

	adev->mic_mute = state;

	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_get_mic_mute(const struct audio_hw_device *dev, bool *state)
{
	struct alsa_audio_device *adev = (struct alsa_audio_device *)dev;

	*state = adev->mic_mute;

	return 0;
}

/* interface libhardware/include/hardware/audio.h */
#ifdef AUDIO_DEVICE_API_VERSION_1_0
static size_t adev_get_input_buffer_size(const struct audio_hw_device *dev,
					const struct audio_config *config)
#else
	static size_t adev_get_input_buffer_size(const struct audio_hw_device *dev,
						uint32_t sample_rate, int format,
						int channel_count)
#endif
{
	size_t size;
#ifdef AUDIO_DEVICE_API_VERSION_1_0
	int channel_count = popcount(config->channel_mask);
	if (check_input_parameters(config->sample_rate, config->format,
					channel_count) != 0)
		return 0;

	return get_input_buffer_size(config->sample_rate, config->format,
				channel_count);
#else
	if (check_input_parameters(sample_rate, format, channel_count) != 0)
		return 0;

	return get_input_buffer_size(sample_rate, format, channel_count);
#endif
}

/* interface libhardware/include/hardware/audio.h */
#ifdef AUDIO_DEVICE_API_VERSION_1_0
static int adev_open_input_stream(struct audio_hw_device *dev,
				audio_io_handle_t handle,
				audio_devices_t devices,
				struct audio_config *config,
				struct audio_stream_in **stream_in)
#else
	static int adev_open_input_stream(struct audio_hw_device *dev, uint32_t devices,
					int *format, uint32_t *channel_mask,
					uint32_t *sample_rate,
					audio_in_acoustics_t acoustics,
					struct audio_stream_in **stream_in)
#endif
{
	struct alsa_audio_device *ladev = (struct alsa_audio_device *)dev;
	struct alsa_stream_in *in;
	int ret;

#ifdef AUDIO_DEVICE_API_VERSION_1_0
	int channel_count = popcount(config->channel_mask);
	if (check_input_parameters(config->sample_rate, config->format,
					channel_count) != 0)
#else
		int channel_count = popcount(*channel_mask);
	if (check_input_parameters(*sample_rate, *format, channel_count) != 0)
#endif
		return -EINVAL;

	in = (struct alsa_stream_in *)calloc(1, sizeof(struct alsa_stream_in));
	if (!in)
		return -ENOMEM;

	in->stream.common.get_sample_rate = in_get_sample_rate;
	in->stream.common.set_sample_rate = in_set_sample_rate;
	in->stream.common.get_buffer_size = in_get_buffer_size;
	in->stream.common.get_channels = in_get_channels;
	in->stream.common.get_format = in_get_format;
	in->stream.common.set_format = in_set_format;
	in->stream.common.standby = in_standby;
	in->stream.common.dump = in_dump;
	in->stream.common.set_parameters = in_set_parameters;
	in->stream.common.get_parameters = in_get_parameters;
	in->stream.common.add_audio_effect = in_add_audio_effect;
	in->stream.common.remove_audio_effect = in_remove_audio_effect;
	in->stream.set_gain = in_set_gain;
	in->stream.read = in_read;
	in->stream.get_input_frames_lost = in_get_input_frames_lost;

#ifdef AUDIO_DEVICE_API_VERSION_1_0
	in->requested_rate = config->sample_rate;
#else
	in->requested_rate = *sample_rate;
#endif

	memcpy(&in->config, &pcm_config_in, sizeof(pcm_config_in));
	in->config.channels = channel_count;

	in->buffer = malloc(in->config.period_size *
			audio_stream_frame_size(&in->stream.common));
	if (!in->buffer) {
		ret = -ENOMEM;
		goto err;
	}

	if (in->requested_rate != in->config.rate) {
		in->buf_provider.get_next_buffer = get_next_buffer;
		in->buf_provider.release_buffer = release_buffer;

		ret = create_resampler(in->config.rate,
				in->requested_rate,
				in->config.channels,
				RESAMPLER_QUALITY_DEFAULT,
				&in->buf_provider,
				&in->resampler);
		if (ret != 0) {
			ret = -EINVAL;
			goto err;
		}
	}

	in->dev = ladev;
	in->standby = 1;
	in->device = devices;

	*stream_in = &in->stream;
	return 0;

err:
	if (in->resampler)
		release_resampler(in->resampler);

	free(in);
	*stream_in = NULL;
	return ret;
}

/* interface libhardware/include/hardware/audio.h */
static void adev_close_input_stream(struct audio_hw_device *dev,
				struct audio_stream_in *stream)
{
	struct alsa_stream_in *in = (struct alsa_stream_in *)stream;

	in_standby(&stream->common);

	if (in->resampler) {
		free(in->buffer);
		release_resampler(in->resampler);
	}
	if (in->proc_buf)
		free(in->proc_buf);
	if (in->ref_buf)
		free(in->ref_buf);

	free(stream);
	return;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_dump(const audio_hw_device_t *device, int fd)
{
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static int adev_close(hw_device_t *device)
{
	struct alsa_audio_device *adev = (struct alsa_audio_device *)device;

	mixer_close(adev->mixer);
	free(device);
	return 0;
}

/* interface libhardware/include/hardware/audio.h */
static uint32_t adev_get_supported_devices(const struct audio_hw_device *dev)
{
	return (/* OUT */
		AUDIO_DEVICE_OUT_SPEAKER |
		AUDIO_DEVICE_OUT_WIRED_HEADPHONE |
		AUDIO_DEVICE_OUT_DEFAULT |
		/* IN */
		AUDIO_DEVICE_IN_BUILTIN_MIC |
		AUDIO_DEVICE_IN_DEFAULT);
}

static int adev_open(const hw_module_t* module, const char* name,
		hw_device_t** device)
{
	struct alsa_audio_device *adev;
	int ret;

	if (strcmp(name, AUDIO_HARDWARE_INTERFACE) != 0)
		return -EINVAL;

	adev = calloc(1, sizeof(struct alsa_audio_device));
	if (!adev)
		return -ENOMEM;

	adev->hw_device.common.tag = HARDWARE_DEVICE_TAG;
	adev->hw_device.common.version = AUDIO_DEVICE_API_VERSION_CURRENT;
	adev->hw_device.common.module = (struct hw_module_t *) module;
	adev->hw_device.common.close = adev_close;

	adev->hw_device.get_supported_devices = adev_get_supported_devices;
	adev->hw_device.init_check = adev_init_check;
	adev->hw_device.set_voice_volume = adev_set_voice_volume;
	adev->hw_device.set_master_volume = adev_set_master_volume;
	adev->hw_device.set_mode = adev_set_mode;
	adev->hw_device.set_mic_mute = adev_set_mic_mute;
	adev->hw_device.get_mic_mute = adev_get_mic_mute;
	adev->hw_device.set_parameters = adev_set_parameters;
	adev->hw_device.get_parameters = adev_get_parameters;
	adev->hw_device.get_input_buffer_size = adev_get_input_buffer_size;
	adev->hw_device.open_output_stream = adev_open_output_stream;
	adev->hw_device.close_output_stream = adev_close_output_stream;
	adev->hw_device.open_input_stream = adev_open_input_stream;
	adev->hw_device.close_input_stream = adev_close_input_stream;
	adev->hw_device.dump = adev_dump;

	adev->mixer = mixer_open(0);
	if (!adev->mixer) {
		free(adev);
		LOGE("Unable to open the mixer, aborting.");
		return -EINVAL;
	}


	adev->mixer_ctls.mic_volume = mixer_get_ctl_by_name(adev->mixer,
							MIXER_MASTER_PLAYBACK_SWITCH);
	if (!adev->mixer_ctls.mic_volume) {
		LOGE("Error mixer control: '%s' not found",MIXER_MASTER_PLAYBACK_SWITCH);
		goto error_out;
	}

	adev->mixer_ctls.pcm_volume = mixer_get_ctl_by_name(adev->mixer,
							MIXER_MASTER_PLAYBACK_VOLUME);
	if (!adev->mixer_ctls.pcm_volume) {
		LOGE("Error mixer control: '%s' not found",MIXER_MASTER_PLAYBACK_VOLUME);
		goto error_out;
	}

	adev->mixer_ctls.headset_volume = mixer_get_ctl_by_name(adev->mixer,
								MIXER_PCM_PLAYBACK_SWITCH);
	if (!adev->mixer_ctls.headset_volume) {
		LOGE("Error mixer control: '%s' not found",MIXER_PCM_PLAYBACK_SWITCH);
		goto error_out;
	}

	adev->mixer_ctls.speaker_volume = mixer_get_ctl_by_name(adev->mixer,
								MIXER_PCM_PLAYBACK_VOLUME);
	if (!adev->mixer_ctls.speaker_volume) {
		LOGE("Error mixer control: '%s' not found",MIXER_PCM_PLAYBACK_VOLUME);
		goto error_out;
	}

	adev->mixer_ctls.mic_switch = mixer_get_ctl_by_name(adev->mixer,
							MIXER_MIC_PLAYBACK_SWITCH);
	if (!adev->mixer_ctls.mic_switch) {
		LOGE("Error mixer control: '%s' not found",MIXER_MIC_PLAYBACK_SWITCH);
		goto error_out;
	}

	adev->mixer_ctls.headset_switch = mixer_get_ctl_by_name(adev->mixer,
								MIXER_MIC_PLAYBACK_VOLUME);
	if (!adev->mixer_ctls.headset_switch) {
		LOGE("Error mixer control: '%s' not found",MIXER_MIC_PLAYBACK_VOLUME);
		goto error_out;
	}

	adev->mixer_ctls.speaker_switch = mixer_get_ctl_by_name(adev->mixer,
								MIXER_MASTER_MONO_PLAYBACK_SWITCH);
	if (!adev->mixer_ctls.speaker_switch) {
		LOGE("Error mixer control: '%s' not found",MIXER_MASTER_MONO_PLAYBACK_SWITCH);
		goto error_out;
	}

	adev->mixer_ctls.speaker_switch = mixer_get_ctl_by_name(adev->mixer,
								MIXER_MASTER_MONO_PLAYBACK_VOLUME);
	if (!adev->mixer_ctls.speaker_switch) {
		LOGE("Error mixer control: '%s' not found",MIXER_MASTER_MONO_PLAYBACK_VOLUME);
		goto error_out;
	}


	/* Set the default route before the PCM stream is opened */
	pthread_mutex_lock(&adev->lock);
	set_route_by_array(adev->mixer, defaults, 1);
	adev->mode = AUDIO_MODE_NORMAL;
	adev->devices = AUDIO_DEVICE_OUT_DEFAULT | AUDIO_DEVICE_IN_DEFAULT;

	pthread_mutex_unlock(&adev->lock);

	*device = &adev->hw_device.common;

	return 0;

error_out:
	mixer_close(adev->mixer);
	free(adev);
	return -EINVAL;
}

static struct hw_module_methods_t hal_module_methods = {
	.open = adev_open,
};

struct audio_module HAL_MODULE_INFO_SYM = {
	.common = {
		.tag = HARDWARE_MODULE_TAG,
		.version_major = 1,
		.version_minor = 0,
		.id = AUDIO_HARDWARE_MODULE_ID,
		.name = "ARM VExpress audio HW HAL",
		.author = "The Android Open Source Project",
		.methods = &hal_module_methods,
	},
};