зеркало из https://github.com/mozilla/pjs.git
303 строки
8.6 KiB
C++
303 строки
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Double <chris.double@double.co.nz>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdio.h>
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#include <math.h>
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#include "prlog.h"
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#include "prmem.h"
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#include "nsAutoPtr.h"
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#include "nsAudioStream.h"
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#include "nsAlgorithm.h"
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extern "C" {
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#include "sydneyaudio/sydney_audio.h"
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}
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#include "mozilla/TimeStamp.h"
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#if defined(XP_MACOSX)
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#define SA_PER_STREAM_VOLUME 1
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#endif
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using mozilla::TimeStamp;
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#ifdef PR_LOGGING
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PRLogModuleInfo* gAudioStreamLog = nsnull;
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#endif
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#define FAKE_BUFFER_SIZE 176400
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#define MILLISECONDS_PER_SECOND 1000
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void nsAudioStream::InitLibrary()
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{
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#ifdef PR_LOGGING
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gAudioStreamLog = PR_NewLogModule("nsAudioStream");
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#endif
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}
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void nsAudioStream::ShutdownLibrary()
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{
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}
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nsAudioStream::nsAudioStream() :
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mVolume(1.0),
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mAudioHandle(0),
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mRate(0),
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mChannels(0),
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mFormat(FORMAT_S16_LE),
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mPaused(PR_FALSE),
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mInError(PR_FALSE)
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{
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}
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nsAudioStream::~nsAudioStream()
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{
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Shutdown();
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}
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nsresult nsAudioStream::Init(PRInt32 aNumChannels, PRInt32 aRate, SampleFormat aFormat)
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{
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mRate = aRate;
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mChannels = aNumChannels;
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mFormat = aFormat;
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if (sa_stream_create_pcm(reinterpret_cast<sa_stream_t**>(&mAudioHandle),
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NULL,
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SA_MODE_WRONLY,
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SA_PCM_FORMAT_S16_NE,
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aRate,
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aNumChannels) != SA_SUCCESS) {
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mAudioHandle = nsnull;
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mInError = PR_TRUE;
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PR_LOG(gAudioStreamLog, PR_LOG_ERROR, ("nsAudioStream: sa_stream_create_pcm error"));
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return NS_ERROR_FAILURE;
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}
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if (sa_stream_open(static_cast<sa_stream_t*>(mAudioHandle)) != SA_SUCCESS) {
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sa_stream_destroy(static_cast<sa_stream_t*>(mAudioHandle));
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mAudioHandle = nsnull;
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mInError = PR_TRUE;
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PR_LOG(gAudioStreamLog, PR_LOG_ERROR, ("nsAudioStream: sa_stream_open error"));
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return NS_ERROR_FAILURE;
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}
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mInError = PR_FALSE;
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return NS_OK;
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}
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void nsAudioStream::Shutdown()
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{
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if (!mAudioHandle)
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return;
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sa_stream_destroy(static_cast<sa_stream_t*>(mAudioHandle));
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mAudioHandle = nsnull;
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mInError = PR_TRUE;
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}
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nsresult nsAudioStream::Write(const void* aBuf, PRUint32 aCount, PRBool aBlocking)
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{
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NS_ABORT_IF_FALSE(aCount % mChannels == 0,
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"Buffer size must be divisible by channel count");
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NS_ASSERTION(!mPaused, "Don't write audio when paused, you'll block");
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if (mInError)
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return NS_ERROR_FAILURE;
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PRUint32 offset = mBufferOverflow.Length();
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PRUint32 count = aCount + offset;
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nsAutoArrayPtr<short> s_data(new short[count]);
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if (s_data) {
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for (PRUint32 i=0; i < offset; ++i) {
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s_data[i] = mBufferOverflow.ElementAt(i);
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}
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mBufferOverflow.Clear();
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switch (mFormat) {
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case FORMAT_U8: {
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const PRUint8* buf = static_cast<const PRUint8*>(aBuf);
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PRInt32 volume = PRInt32((1 << 16) * mVolume);
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for (PRUint32 i = 0; i < aCount; ++i) {
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s_data[i + offset] = short(((PRInt32(buf[i]) - 128) * volume) >> 8);
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}
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break;
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}
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case FORMAT_S16_LE: {
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const short* buf = static_cast<const short*>(aBuf);
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PRInt32 volume = PRInt32((1 << 16) * mVolume);
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for (PRUint32 i = 0; i < aCount; ++i) {
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short s = buf[i];
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#if defined(IS_BIG_ENDIAN)
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s = ((s & 0x00ff) << 8) | ((s & 0xff00) >> 8);
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#endif
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s_data[i + offset] = short((PRInt32(s) * volume) >> 16);
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}
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break;
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}
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case FORMAT_FLOAT32: {
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const float* buf = static_cast<const float*>(aBuf);
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for (PRUint32 i = 0; i < aCount; ++i) {
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float scaled_value = floorf(0.5 + 32768 * buf[i] * mVolume);
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if (buf[i] < 0.0) {
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s_data[i + offset] = (scaled_value < -32768.0) ?
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-32768 :
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short(scaled_value);
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} else {
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s_data[i+offset] = (scaled_value > 32767.0) ?
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32767 :
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short(scaled_value);
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}
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}
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break;
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}
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}
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if (!aBlocking) {
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// We're running in non-blocking mode, crop the data to the amount
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// which is available in the audio buffer, and save the rest for
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// subsequent calls.
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PRUint32 available = Available();
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if (available < count) {
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mBufferOverflow.AppendElements(s_data.get() + available, (count - available));
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count = available;
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}
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}
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if (sa_stream_write(static_cast<sa_stream_t*>(mAudioHandle),
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s_data.get(),
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count * sizeof(short)) != SA_SUCCESS)
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{
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PR_LOG(gAudioStreamLog, PR_LOG_ERROR, ("nsAudioStream: sa_stream_write error"));
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mInError = PR_TRUE;
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return NS_ERROR_FAILURE;
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}
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}
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return NS_OK;
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}
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PRUint32 nsAudioStream::Available()
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{
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// If the audio backend failed to open, lie and say we'll accept some
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// data.
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if (mInError)
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return FAKE_BUFFER_SIZE;
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size_t s = 0;
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if (sa_stream_get_write_size(static_cast<sa_stream_t*>(mAudioHandle), &s) != SA_SUCCESS)
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return 0;
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return s / sizeof(short);
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}
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void nsAudioStream::SetVolume(float aVolume)
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{
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NS_ASSERTION(aVolume >= 0.0 && aVolume <= 1.0, "Invalid volume");
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#if defined(SA_PER_STREAM_VOLUME)
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if (sa_stream_set_volume_abs(static_cast<sa_stream_t*>(mAudioHandle), aVolume) != SA_SUCCESS) {
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PR_LOG(gAudioStreamLog, PR_LOG_ERROR, ("nsAudioStream: sa_stream_set_volume_abs error"));
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mInError = PR_TRUE;
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}
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#else
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mVolume = aVolume;
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#endif
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}
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void nsAudioStream::Drain()
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{
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if (mInError)
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return;
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// Write any remaining unwritten sound data in the overflow buffer
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if (!mBufferOverflow.IsEmpty()) {
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if (sa_stream_write(static_cast<sa_stream_t*>(mAudioHandle),
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mBufferOverflow.Elements(),
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mBufferOverflow.Length() * sizeof(short)) != SA_SUCCESS)
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PR_LOG(gAudioStreamLog, PR_LOG_ERROR, ("nsAudioStream: sa_stream_write error"));
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mInError = PR_TRUE;
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return;
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}
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int r = sa_stream_drain(static_cast<sa_stream_t*>(mAudioHandle));
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if (r != SA_SUCCESS && r != SA_ERROR_INVALID) {
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PR_LOG(gAudioStreamLog, PR_LOG_ERROR, ("nsAudioStream: sa_stream_drain error"));
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mInError = PR_TRUE;
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}
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}
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void nsAudioStream::Pause()
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{
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if (mInError)
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return;
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mPaused = PR_TRUE;
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sa_stream_pause(static_cast<sa_stream_t*>(mAudioHandle));
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}
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void nsAudioStream::Resume()
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{
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if (mInError)
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return;
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mPaused = PR_FALSE;
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sa_stream_resume(static_cast<sa_stream_t*>(mAudioHandle));
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}
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PRInt64 nsAudioStream::GetPosition()
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{
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PRInt64 sampleOffset = GetSampleOffset();
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if (sampleOffset >= 0) {
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return ((MILLISECONDS_PER_SECOND * sampleOffset) / mRate / mChannels);
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}
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return -1;
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}
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PRInt64 nsAudioStream::GetSampleOffset()
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{
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if (mInError) {
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return -1;
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}
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sa_position_t positionType = SA_POSITION_WRITE_SOFTWARE;
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#if defined(XP_WIN)
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positionType = SA_POSITION_WRITE_HARDWARE;
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#endif
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PRInt64 position = 0;
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if (sa_stream_get_position(static_cast<sa_stream_t*>(mAudioHandle),
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positionType, &position) == SA_SUCCESS) {
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return position / sizeof(short);
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}
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return -1;
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}
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