播放器新增支持音频:#945

player/AudioSRC.cpp

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
+ *
+ * This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
+ *
+ * Use of this source code is governed by MIT license that can be found in the
+ * LICENSE file in the root of the source tree. All contributing project authors
+ * may be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "Util/logger.h"
+#include "AudioSRC.h"
+#include "SDLAudioDevice.h"
+
+using namespace std;
+using namespace toolkit;
+
+AudioSRC::AudioSRC(AudioSRCDelegate *del) {
+    _delegate = del;
+}
+
+AudioSRC::~AudioSRC() {}
+
+void AudioSRC::setOutputAudioConfig(const SDL_AudioSpec &cfg) {
+    int freq = _delegate->getPCMSampleRate();
+    int format = _delegate->getPCMFormat();
+    int channels = _delegate->getPCMChannel();
+    if (-1 == SDL_BuildAudioCVT(&_audio_cvt, format, channels, freq, cfg.format, cfg.channels, cfg.freq)) {
+        throw std::runtime_error("the format conversion is not supported");
+    }
+    InfoL << "audio cvt origin format, freq:" << freq << ", format:" << hex << format  << dec << ", channels:" << channels;
+    InfoL << "audio cvt info, "
+          << "needed:" << _audio_cvt.needed
+          << ", src_format:" << hex << _audio_cvt.src_format
+          << ", dst_format:" << _audio_cvt.dst_format << dec
+          << ", rate_incr:" << _audio_cvt.rate_incr
+          << ", len_mult:" << _audio_cvt.len_mult
+          << ", len_ratio:" << _audio_cvt.len_ratio;
+}
+
+void AudioSRC::setEnableMix(bool flag) {
+    _enabled = flag;
+}
+
+int AudioSRC::getPCMData(char *buf, int size) {
+    if (!_enabled) {
+        return 0;
+    }
+    if (!_audio_cvt.needed) {
+        //获取原始数据，不需要频率转换
+        return _delegate->getPCMData(buf, size);
+    }
+
+    if ((int)(size / _audio_cvt.len_ratio) != _origin_size) {
+        _origin_size = size / _audio_cvt.len_ratio;
+        _origin_buf.reset(new char[std::max(_origin_size, size)], [](char *ptr) {
+            delete[] ptr;
+        });
+        InfoL << "origin pcm buffer size is:" << _origin_size << ", target pcm buffer size is:" << size;
+    }
+
+    auto origin_size = _delegate->getPCMData(_origin_buf.get(), _origin_size);
+    if (!origin_size) {
+        //获取数据失败
+        TraceL << "get empty pcm data";
+        return 0;
+    }
+
+    _audio_cvt.buf = (Uint8 *) _origin_buf.get();
+    _audio_cvt.len = origin_size;
+    if (0 != SDL_ConvertAudio(&_audio_cvt)) {
+        WarnL << "SDL_ConvertAudio failed!";
+        _audio_cvt.len_cvt = 0;
+    }
+    if (_audio_cvt.len_cvt) {
+        _target_buf.append(_origin_buf.get(), _audio_cvt.len_cvt);
+    }
+    if (_target_buf.size() < size) {
+        return 0;
+    }
+    memcpy(buf, _target_buf.data(), size);
+    _target_buf.erase(0, size);
+    return size;
+}
+
+////////////////////////////////////////////////////////////////////////
+
+AudioPlayer::AudioPlayer() : AudioSRC(this) {
+    _device = SDLAudioDevice::Instance().shared_from_this();
+}
+
+AudioPlayer::~AudioPlayer() {
+    _device->delChannel(this);
+}
+
+void AudioPlayer::setup(int sample_rate, int channel, SDL_AudioFormat format) {
+    _sample_rate = sample_rate;
+    _channel = channel;
+    _format = format;
+    _device->addChannel(this);
+}
+
+SDL_AudioFormat AudioPlayer::getPCMFormat() {
+    return _format;
+}
+
+int AudioPlayer::getPCMSampleRate() {
+    return _sample_rate;
+}
+
+int AudioPlayer::getPCMChannel() {
+    return _channel;
+}
+
+int AudioPlayer::getPCMData(char *buf, int size) {
+    if (_buffer.size() < size) {
+        return 0;
+    }
+    memcpy(buf, _buffer.data(), size);
+    _buffer.erase(0, size);
+    return size;
+}
+
+void AudioPlayer::inputFrame(const char *data, size_t size){
+    _buffer.append(data, size);
+}