314 lines
8.8 KiB
C++
314 lines
8.8 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_NDEBUG 0
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#define LOG_TAG "BootAnim_AudioPlayer"
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#include "AudioPlayer.h"
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#include <androidfw/ZipFileRO.h>
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#include <tinyalsa/asoundlib.h>
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#include <utils/Log.h>
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#include <utils/String8.h>
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#define ID_RIFF 0x46464952
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#define ID_WAVE 0x45564157
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#define ID_FMT 0x20746d66
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#define ID_DATA 0x61746164
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// Maximum line length for audio_conf.txt
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// We only accept lines less than this length to avoid overflows using sscanf()
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#define MAX_LINE_LENGTH 1024
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struct riff_wave_header {
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uint32_t riff_id;
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uint32_t riff_sz;
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uint32_t wave_id;
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};
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struct chunk_header {
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uint32_t id;
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uint32_t sz;
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};
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struct chunk_fmt {
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uint16_t audio_format;
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uint16_t num_channels;
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uint32_t sample_rate;
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uint32_t byte_rate;
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uint16_t block_align;
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uint16_t bits_per_sample;
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};
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namespace android {
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AudioPlayer::AudioPlayer()
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: mCard(-1),
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mDevice(-1),
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mPeriodSize(0),
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mPeriodCount(0),
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mCurrentFile(NULL)
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{
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}
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AudioPlayer::~AudioPlayer() {
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}
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static bool setMixerValue(struct mixer* mixer, const char* name, const char* values)
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{
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if (!mixer) {
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ALOGE("no mixer in setMixerValue");
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return false;
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}
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struct mixer_ctl *ctl = mixer_get_ctl_by_name(mixer, name);
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if (!ctl) {
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ALOGE("mixer_get_ctl_by_name failed for %s", name);
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return false;
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}
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enum mixer_ctl_type type = mixer_ctl_get_type(ctl);
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int numValues = mixer_ctl_get_num_values(ctl);
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int intValue;
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char stringValue[MAX_LINE_LENGTH];
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for (int i = 0; i < numValues && values; i++) {
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// strip leading space
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while (*values == ' ') values++;
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if (*values == 0) break;
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switch (type) {
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case MIXER_CTL_TYPE_BOOL:
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case MIXER_CTL_TYPE_INT:
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if (sscanf(values, "%d", &intValue) == 1) {
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if (mixer_ctl_set_value(ctl, i, intValue) != 0) {
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ALOGE("mixer_ctl_set_value failed for %s %d", name, intValue);
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}
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} else {
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ALOGE("Could not parse %s as int for %s", values, name);
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}
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break;
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case MIXER_CTL_TYPE_ENUM:
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if (sscanf(values, "%s", stringValue) == 1) {
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if (mixer_ctl_set_enum_by_string(ctl, stringValue) != 0) {
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ALOGE("mixer_ctl_set_enum_by_string failed for %s %s", name, stringValue);
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}
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} else {
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ALOGE("Could not parse %s as enum for %s", values, name);
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}
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break;
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default:
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ALOGE("unsupported mixer type %d for %s", type, name);
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break;
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}
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values = strchr(values, ' ');
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}
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return true;
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}
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/*
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* Parse the audio configuration file.
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* The file is named audio_conf.txt and must begin with the following header:
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*
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* card=<ALSA card number>
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* device=<ALSA device number>
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* period_size=<period size>
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* period_count=<period count>
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*
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* This header is followed by zero or more mixer settings, each with the format:
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* mixer "<name>" = <value list>
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* Since mixer names can contain spaces, the name must be enclosed in double quotes.
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* The values in the value list can be integers, booleans (represented by 0 or 1)
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* or strings for enum values.
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*/
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bool AudioPlayer::init(const char* config)
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{
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int tempInt;
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struct mixer* mixer = NULL;
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char name[MAX_LINE_LENGTH];
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for (;;) {
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const char* endl = strstr(config, "\n");
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if (!endl) break;
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String8 line(config, endl - config);
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if (line.length() >= MAX_LINE_LENGTH) {
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ALOGE("Line too long in audio_conf.txt");
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return false;
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}
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const char* l = line.string();
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if (sscanf(l, "card=%d", &tempInt) == 1) {
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ALOGD("card=%d", tempInt);
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mCard = tempInt;
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mixer = mixer_open(mCard);
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if (!mixer) {
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ALOGE("could not open mixer for card %d", mCard);
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return false;
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}
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} else if (sscanf(l, "device=%d", &tempInt) == 1) {
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ALOGD("device=%d", tempInt);
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mDevice = tempInt;
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} else if (sscanf(l, "period_size=%d", &tempInt) == 1) {
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ALOGD("period_size=%d", tempInt);
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mPeriodSize = tempInt;
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} else if (sscanf(l, "period_count=%d", &tempInt) == 1) {
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ALOGD("period_count=%d", tempInt);
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mPeriodCount = tempInt;
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} else if (sscanf(l, "mixer \"%[0-9a-zA-Z _]s\"", name) == 1) {
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const char* values = strchr(l, '=');
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if (values) {
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values++; // skip '='
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ALOGD("name: \"%s\" = %s", name, values);
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setMixerValue(mixer, name, values);
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} else {
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ALOGE("values missing for name: \"%s\"", name);
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}
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}
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config = ++endl;
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}
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mixer_close(mixer);
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if (mCard >= 0 && mDevice >= 0) {
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return true;
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}
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return false;
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}
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void AudioPlayer::playFile(FileMap* fileMap) {
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// stop any currently playing sound
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requestExitAndWait();
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mCurrentFile = fileMap;
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run("bootanim audio", PRIORITY_URGENT_AUDIO);
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}
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bool AudioPlayer::threadLoop()
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{
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struct pcm_config config;
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struct pcm *pcm = NULL;
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bool moreChunks = true;
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const struct chunk_fmt* chunkFmt = NULL;
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int bufferSize;
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const uint8_t* wavData;
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size_t wavLength;
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const struct riff_wave_header* wavHeader;
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if (mCurrentFile == NULL) {
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ALOGE("mCurrentFile is NULL");
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return false;
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}
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wavData = (const uint8_t *)mCurrentFile->getDataPtr();
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if (!wavData) {
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ALOGE("Could not access WAV file data");
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goto exit;
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}
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wavLength = mCurrentFile->getDataLength();
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wavHeader = (const struct riff_wave_header *)wavData;
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if (wavLength < sizeof(*wavHeader) || (wavHeader->riff_id != ID_RIFF) ||
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(wavHeader->wave_id != ID_WAVE)) {
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ALOGE("Error: audio file is not a riff/wave file\n");
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goto exit;
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}
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wavData += sizeof(*wavHeader);
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wavLength -= sizeof(*wavHeader);
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do {
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const struct chunk_header* chunkHeader = (const struct chunk_header*)wavData;
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if (wavLength < sizeof(*chunkHeader)) {
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ALOGE("EOF reading chunk headers");
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goto exit;
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}
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wavData += sizeof(*chunkHeader);
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wavLength -= sizeof(*chunkHeader);
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switch (chunkHeader->id) {
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case ID_FMT:
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chunkFmt = (const struct chunk_fmt *)wavData;
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wavData += chunkHeader->sz;
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wavLength -= chunkHeader->sz;
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break;
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case ID_DATA:
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/* Stop looking for chunks */
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moreChunks = 0;
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break;
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default:
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/* Unknown chunk, skip bytes */
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wavData += chunkHeader->sz;
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wavLength -= chunkHeader->sz;
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}
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} while (moreChunks);
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if (!chunkFmt) {
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ALOGE("format not found in WAV file");
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goto exit;
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}
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memset(&config, 0, sizeof(config));
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config.channels = chunkFmt->num_channels;
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config.rate = chunkFmt->sample_rate;
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config.period_size = mPeriodSize;
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config.period_count = mPeriodCount;
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config.start_threshold = mPeriodSize / 4;
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config.stop_threshold = INT_MAX;
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config.avail_min = config.start_threshold;
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if (chunkFmt->bits_per_sample != 16) {
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ALOGE("only 16 bit WAV files are supported");
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goto exit;
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}
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config.format = PCM_FORMAT_S16_LE;
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pcm = pcm_open(mCard, mDevice, PCM_OUT, &config);
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if (!pcm || !pcm_is_ready(pcm)) {
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ALOGE("Unable to open PCM device (%s)\n", pcm_get_error(pcm));
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goto exit;
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}
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bufferSize = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
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while (wavLength > 0) {
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if (exitPending()) goto exit;
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size_t count = bufferSize;
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if (count > wavLength)
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count = wavLength;
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if (pcm_write(pcm, wavData, count)) {
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ALOGE("pcm_write failed (%s)", pcm_get_error(pcm));
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goto exit;
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}
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wavData += count;
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wavLength -= count;
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}
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exit:
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if (pcm)
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pcm_close(pcm);
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delete mCurrentFile;
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mCurrentFile = NULL;
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return false;
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}
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} // namespace android
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