15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef PPAPI_CPP_AUDIO_CONFIG_H_ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define PPAPI_CPP_AUDIO_CONFIG_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/c/ppb_audio_config.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/c/pp_stdint.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "ppapi/cpp/resource.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// @file 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// This file defines the interface for establishing an 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// audio configuration resource within the browser. 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace pp { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class InstanceHandle; 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// A 16 bit stereo AudioConfig resource. Refer to the 215d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)/// <a href="/native-client/devguide/coding/audio.html">Audio 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// </a>chapter in the Developer's Guide for information on using this 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// interface. 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// A single sample frame on a stereo device means one value for the left 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// channel and one value for the right channel. 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// Buffer layout for a stereo int16 configuration: 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>int16_t *buffer16;</code> 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>buffer16[0]</code> is the first left channel sample. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>buffer16[1]</code> is the first right channel sample. 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>buffer16[2]</code> is the second left channel sample. 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>buffer16[3]</code> is the second right channel sample. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>...</code> 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>buffer16[2 * (sample_frame_count - 1)]</code> is the last left 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// channel sample. 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <code>buffer16[2 * (sample_frame_count - 1) + 1]</code> is the last right 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// channel sample. 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// Data will always be in the native endian format of the platform. 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// <strong>Example:</strong> 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// @code 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// // Create an audio config with a supported frame count. 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// uint32_t sample_frame_count = AudioConfig::RecommendSampleFrameCount( 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// PP_AUDIOSAMPLERATE_44100, 4096); 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// AudioConfig config(PP_AUDIOSAMPLERATE_44100, sample_frame_count); 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// if (config.is_null()) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// return false; // Couldn't configure audio. 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// // Then use the config to create your audio resource. 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// Audio audio(instance, config, callback, user_data); 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// if (audio.is_null()) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// return false; // Couldn't create audio. 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/// @endcode 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class AudioConfig : public Resource { 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// An empty constructor for an <code>AudioConfig</code> resource. 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioConfig(); 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// A constructor that creates an audio config based on the given sample rate 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// and frame count. If the rate and frame count aren't supported, the 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// resulting resource will be is_null(). You can pass the result of 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// RecommendSampleFrameCount() as the sample frame count. 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @param[in] instance The instance associated with this resource. 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @param[in] sample_rate A <code>PP_AudioSampleRate</code> which is either 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>PP_AUDIOSAMPLERATE_44100</code> or 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>PP_AUDIOSAMPLERATE_48000</code>. 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @param[in] sample_frame_count A uint32_t frame count returned from the 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>RecommendSampleFrameCount</code> function. 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AudioConfig(const InstanceHandle& instance, 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PP_AudioSampleRate sample_rate, 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t sample_frame_count); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// RecommendSampleRate() returns the native sample rate used by the 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// audio system. Applications that use the recommended sample rate might 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// obtain lower latency and higher fidelity output. 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @param[in] instance The instance associated with this resource. 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static PP_AudioSampleRate RecommendSampleRate( 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const InstanceHandle& instance); 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// RecommendSampleFrameCount() returns a supported frame count closest to 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// the requested count. The sample frame count determines the overall 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// latency of audio. Smaller frame counts will yield lower latency, but 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// higher CPU utilization. Supported sample frame counts will vary by 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// hardware and system (consider that the local system might be anywhere 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// from a cell phone or a high-end audio workstation). Sample counts less 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// than <code>PP_AUDIOMINSAMPLEFRAMECOUNT</code> and greater than 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>PP_AUDIOMAXSAMPLEFRAMECOUNT</code> are never supported on any 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// system, but values in between aren't necessarily valid. This function 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// will return a supported count closest to the requested value for use in 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// the constructor. 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @param[in] instance The instance associated with this resource. 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @param[in] sample_rate A <code>PP_AudioSampleRate</code> which is either 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>PP_AUDIOSAMPLERATE_44100</code> or 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>PP_AUDIOSAMPLERATE_48000</code>. 103c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) /// @param[in] requested_sample_frame_count A uint32_t requested frame count. 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @return A uint32_t containing the recommended sample frame count if 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// successful. If the sample frame count or bit rate is not supported, 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// this function will fail and return 0. 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static uint32_t RecommendSampleFrameCount( 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const InstanceHandle& instance, 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PP_AudioSampleRate sample_rate, 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t requested_sample_frame_count); 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// Getter function for returning the internal 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// <code>PP_AudioSampleRate</code> enum. 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @return The <code>PP_AudioSampleRate</code> enum. 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PP_AudioSampleRate sample_rate() const { return sample_rate_; } 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// Getter function for returning the internal sample frame count. 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) /// @return A uint32_t containing the sample frame count. 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t sample_frame_count() const { return sample_frame_count_; } 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) PP_AudioSampleRate sample_rate_; 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t sample_frame_count_; 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace pp 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // PPAPI_CPP_AUDIO_CONFIG_H_ 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 133