/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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_NDEBUG 0
#define LOG_TAG "BootAnim_AudioPlayer"
#include "AudioPlayer.h"
#include <androidfw/ZipFileRO.h>
#include <tinyalsa/asoundlib.h>
#include <utils/Log.h>
#include <utils/String8.h>
#include <media/AudioSystem.h>
#define ID_RIFF 0x46464952
#define ID_WAVE 0x45564157
#define ID_FMT 0x20746d66
#define ID_DATA 0x61746164
// Maximum line length for audio_conf.txt
// We only accept lines less than this length to avoid overflows using sscanf()
#define MAX_LINE_LENGTH 1024
struct riff_wave_header {
uint32_t riff_id;
uint32_t riff_sz;
uint32_t wave_id;
};
struct chunk_header {
uint32_t id;
uint32_t sz;
};
struct chunk_fmt {
uint16_t audio_format;
uint16_t num_channels;
uint32_t sample_rate;
uint32_t byte_rate;
uint16_t block_align;
uint16_t bits_per_sample;
};
namespace android {
AudioPlayer::AudioPlayer()
: mCard(-1),
mDevice(-1),
mPeriodSize(0),
mPeriodCount(0),
mCurrentFile(NULL)
{
}
AudioPlayer::~AudioPlayer() {
}
static bool setMixerValue(struct mixer* mixer, const char* name, const char* values)
{
if (!mixer) {
ALOGE("no mixer in setMixerValue");
return false;
}
struct mixer_ctl *ctl = mixer_get_ctl_by_name(mixer, name);
if (!ctl) {
ALOGE("mixer_get_ctl_by_name failed for %s", name);
return false;
}
enum mixer_ctl_type type = mixer_ctl_get_type(ctl);
int numValues = mixer_ctl_get_num_values(ctl);
int intValue;
char stringValue[MAX_LINE_LENGTH];
for (int i = 0; i < numValues && values; i++) {
// strip leading space
while (*values == ' ') values++;
if (*values == 0) break;
switch (type) {
case MIXER_CTL_TYPE_BOOL:
case MIXER_CTL_TYPE_INT:
if (sscanf(values, "%d", &intValue) == 1) {
if (mixer_ctl_set_value(ctl, i, intValue) != 0) {
ALOGE("mixer_ctl_set_value failed for %s %d", name, intValue);
}
} else {
ALOGE("Could not parse %s as int for %s", values, name);
}
break;
case MIXER_CTL_TYPE_ENUM:
if (sscanf(values, "%s", stringValue) == 1) {
if (mixer_ctl_set_enum_by_string(ctl, stringValue) != 0) {
ALOGE("mixer_ctl_set_enum_by_string failed for %s %s", name, stringValue);
}
} else {
ALOGE("Could not parse %s as enum for %s", values, name);
}
break;
default:
ALOGE("unsupported mixer type %d for %s", type, name);
break;
}
values = strchr(values, ' ');
}
return true;
}
/*
* Parse the audio configuration file.
* The file is named audio_conf.txt and must begin with the following header:
*
* card=<ALSA card number>
* device=<ALSA device number>
* period_size=<period size>
* period_count=<period count>
*
* This header is followed by zero or more mixer settings, each with the format:
* mixer "<name>" = <value list>
* Since mixer names can contain spaces, the name must be enclosed in double quotes.
* The values in the value list can be integers, booleans (represented by 0 or 1)
* or strings for enum values.
*/
bool AudioPlayer::init(const char* config)
{
int tempInt;
struct mixer* mixer = NULL;
char name[MAX_LINE_LENGTH];
// Fake call to wait for audio HAL initialization completion
AudioSystem::getParameters(String8(""));
for (;;) {
const char* endl = strstr(config, "\n");
if (!endl) break;
String8 line(config, endl - config);
if (line.length() >= MAX_LINE_LENGTH) {
ALOGE("Line too long in audio_conf.txt");
return false;
}
const char* l = line.string();
if (sscanf(l, "card=%d", &tempInt) == 1) {
ALOGD("card=%d", tempInt);
mCard = tempInt;
mixer = mixer_open(mCard);
if (!mixer) {
ALOGE("could not open mixer for card %d", mCard);
return false;
}
} else if (sscanf(l, "device=%d", &tempInt) == 1) {
ALOGD("device=%d", tempInt);
mDevice = tempInt;
} else if (sscanf(l, "period_size=%d", &tempInt) == 1) {
ALOGD("period_size=%d", tempInt);
mPeriodSize = tempInt;
} else if (sscanf(l, "period_count=%d", &tempInt) == 1) {
ALOGD("period_count=%d", tempInt);
mPeriodCount = tempInt;
} else if (sscanf(l, "mixer \"%[0-9a-zA-Z _]s\"", name) == 1) {
const char* values = strchr(l, '=');
if (values) {
values++; // skip '='
ALOGD("name: \"%s\" = %s", name, values);
setMixerValue(mixer, name, values);
} else {
ALOGE("values missing for name: \"%s\"", name);
}
}
config = ++endl;
}
mixer_close(mixer);
if (mCard >= 0 && mDevice >= 0) {
return true;
}
return false;
}
void AudioPlayer::playFile(FileMap* fileMap) {
// stop any currently playing sound
requestExitAndWait();
mCurrentFile = fileMap;
run("bootanim audio", PRIORITY_URGENT_AUDIO);
}
bool AudioPlayer::threadLoop()
{
struct pcm_config config;
struct pcm *pcm = NULL;
bool moreChunks = true;
const struct chunk_fmt* chunkFmt = NULL;
int bufferSize;
const uint8_t* wavData;
size_t wavLength;
const struct riff_wave_header* wavHeader;
if (mCurrentFile == NULL) {
ALOGE("mCurrentFile is NULL");
return false;
}
wavData = (const uint8_t *)mCurrentFile->getDataPtr();
if (!wavData) {
ALOGE("Could not access WAV file data");
goto exit;
}
wavLength = mCurrentFile->getDataLength();
wavHeader = (const struct riff_wave_header *)wavData;
if (wavLength < sizeof(*wavHeader) || (wavHeader->riff_id != ID_RIFF) ||
(wavHeader->wave_id != ID_WAVE)) {
ALOGE("Error: audio file is not a riff/wave file\n");
goto exit;
}
wavData += sizeof(*wavHeader);
wavLength -= sizeof(*wavHeader);
do {
const struct chunk_header* chunkHeader = (const struct chunk_header*)wavData;
if (wavLength < sizeof(*chunkHeader)) {
ALOGE("EOF reading chunk headers");
goto exit;
}
wavData += sizeof(*chunkHeader);
wavLength -= sizeof(*chunkHeader);
switch (chunkHeader->id) {
case ID_FMT:
chunkFmt = (const struct chunk_fmt *)wavData;
wavData += chunkHeader->sz;
wavLength -= chunkHeader->sz;
break;
case ID_DATA:
/* Stop looking for chunks */
moreChunks = 0;
break;
default:
/* Unknown chunk, skip bytes */
wavData += chunkHeader->sz;
wavLength -= chunkHeader->sz;
}
} while (moreChunks);
if (!chunkFmt) {
ALOGE("format not found in WAV file");
goto exit;
}
memset(&config, 0, sizeof(config));
config.channels = chunkFmt->num_channels;
config.rate = chunkFmt->sample_rate;
config.period_size = mPeriodSize;
config.period_count = mPeriodCount;
config.start_threshold = mPeriodSize / 4;
config.stop_threshold = INT_MAX;
config.avail_min = config.start_threshold;
if (chunkFmt->bits_per_sample != 16) {
ALOGE("only 16 bit WAV files are supported");
goto exit;
}
config.format = PCM_FORMAT_S16_LE;
pcm = pcm_open(mCard, mDevice, PCM_OUT, &config);
if (!pcm || !pcm_is_ready(pcm)) {
ALOGE("Unable to open PCM device (%s)\n", pcm_get_error(pcm));
goto exit;
}
bufferSize = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
while (wavLength > 0) {
if (exitPending()) goto exit;
size_t count = bufferSize;
if (count > wavLength)
count = wavLength;
if (pcm_write(pcm, wavData, count)) {
ALOGE("pcm_write failed (%s)", pcm_get_error(pcm));
goto exit;
}
wavData += count;
wavLength -= count;
}
exit:
if (pcm)
pcm_close(pcm);
delete mCurrentFile;
mCurrentFile = NULL;
return false;
}
} // namespace android