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https://github.com/QB64-Phoenix-Edition/QB64pe.git
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346 lines
10 KiB
C
346 lines
10 KiB
C
/*
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* OpenAL Audio Stream Example
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*
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* Copyright (c) 2011 by Chris Robinson <chris.kcat@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* This file contains a relatively simple streaming audio player. */
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <assert.h>
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#include "AL/al.h"
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#include "AL/alc.h"
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#include "AL/alext.h"
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#include "alhelpers.h"
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#include "alffmpeg.h"
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LPALBUFFERSAMPLESSOFT palBufferSamplesSOFT = wrap_BufferSamples;
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LPALISBUFFERFORMATSUPPORTEDSOFT palIsBufferFormatSupportedSOFT = NULL;
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/* Define the number of buffers and buffer size (in samples) to use. 4 buffers
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* with 8192 samples each gives a nice per-chunk size, and lets the queue last
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* for almost 3/4ths of a second for a 44.1khz stream. */
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#define NUM_BUFFERS 4
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#define BUFFER_SIZE 8192
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typedef struct StreamPlayer {
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/* These are the buffers and source to play out through OpenAL with */
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ALuint buffers[NUM_BUFFERS];
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ALuint source;
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/* Handles for the audio stream */
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FilePtr file;
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StreamPtr stream;
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/* A temporary data buffer for readAVAudioData to write to and pass to
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* OpenAL with */
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ALbyte *data;
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ALsizei datasize;
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/* The format of the output stream */
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ALenum format;
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ALenum channels;
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ALenum type;
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ALuint rate;
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} StreamPlayer;
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static StreamPlayer *NewPlayer(void);
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static void DeletePlayer(StreamPlayer *player);
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static int OpenPlayerFile(StreamPlayer *player, const char *filename);
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static void ClosePlayerFile(StreamPlayer *player);
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static int StartPlayer(StreamPlayer *player);
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static int UpdatePlayer(StreamPlayer *player);
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/* Creates a new player object, and allocates the needed OpenAL source and
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* buffer objects. Error checking is simplified for the purposes of this
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* example, and will cause an abort if needed. */
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static StreamPlayer *NewPlayer(void)
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{
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StreamPlayer *player;
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player = malloc(sizeof(*player));
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assert(player != NULL);
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memset(player, 0, sizeof(*player));
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/* Generate the buffers and source */
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alGenBuffers(NUM_BUFFERS, player->buffers);
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assert(alGetError() == AL_NO_ERROR && "Could not create buffers");
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alGenSources(1, &player->source);
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assert(alGetError() == AL_NO_ERROR && "Could not create source");
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/* Set parameters so mono sources play out the front-center speaker and
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* won't distance attenuate. */
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alSource3i(player->source, AL_POSITION, 0, 0, -1);
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alSourcei(player->source, AL_SOURCE_RELATIVE, AL_TRUE);
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alSourcei(player->source, AL_ROLLOFF_FACTOR, 0);
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assert(alGetError() == AL_NO_ERROR && "Could not set source parameters");
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return player;
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}
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/* Destroys a player object, deleting the source and buffers. No error handling
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* since these calls shouldn't fail with a properly-made player object. */
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static void DeletePlayer(StreamPlayer *player)
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{
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ClosePlayerFile(player);
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alDeleteSources(1, &player->source);
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alDeleteBuffers(NUM_BUFFERS, player->buffers);
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if(alGetError() != AL_NO_ERROR)
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fprintf(stderr, "Failed to delete object IDs\n");
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memset(player, 0, sizeof(*player));
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free(player);
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}
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/* Opens the first audio stream of the named file. If a file is already open,
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* it will be closed first. */
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static int OpenPlayerFile(StreamPlayer *player, const char *filename)
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{
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ClosePlayerFile(player);
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/* Open the file and get the first stream from it */
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player->file = openAVFile(filename);
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player->stream = getAVAudioStream(player->file, 0);
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if(!player->stream)
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{
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fprintf(stderr, "Could not open audio in %s\n", filename);
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goto error;
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}
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/* Get the stream format, and figure out the OpenAL format */
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if(getAVAudioInfo(player->stream, &player->rate, &player->channels,
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&player->type) != 0)
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{
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fprintf(stderr, "Error getting audio info for %s\n", filename);
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goto error;
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}
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player->format = GetFormat(player->channels, player->type, palIsBufferFormatSupportedSOFT);
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if(player->format == 0)
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{
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fprintf(stderr, "Unsupported format (%s, %s) for %s\n",
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ChannelsName(player->channels), TypeName(player->type),
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filename);
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goto error;
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}
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/* Allocate enough space for the temp buffer, given the format */
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player->datasize = FramesToBytes(BUFFER_SIZE, player->channels,
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player->type);
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player->data = malloc(player->datasize);
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if(player->data == NULL)
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{
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fprintf(stderr, "Error allocating %d bytes\n", player->datasize);
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goto error;
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}
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return 1;
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error:
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closeAVFile(player->file);
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player->file = NULL;
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player->stream = NULL;
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player->datasize = 0;
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return 0;
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}
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/* Closes the audio file stream */
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static void ClosePlayerFile(StreamPlayer *player)
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{
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closeAVFile(player->file);
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player->file = NULL;
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player->stream = NULL;
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free(player->data);
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player->data = NULL;
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player->datasize = 0;
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}
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/* Prebuffers some audio from the file, and starts playing the source */
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static int StartPlayer(StreamPlayer *player)
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{
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size_t i, got;
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/* Rewind the source position and clear the buffer queue */
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alSourceRewind(player->source);
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alSourcei(player->source, AL_BUFFER, 0);
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/* Fill the buffer queue */
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for(i = 0;i < NUM_BUFFERS;i++)
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{
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/* Get some data to give it to the buffer */
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got = readAVAudioData(player->stream, player->data, player->datasize);
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if(got == 0) break;
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palBufferSamplesSOFT(player->buffers[i], player->rate, player->format,
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BytesToFrames(got, player->channels, player->type),
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player->channels, player->type, player->data);
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}
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if(alGetError() != AL_NO_ERROR)
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{
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fprintf(stderr, "Error buffering for playback\n");
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return 0;
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}
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/* Now queue and start playback! */
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alSourceQueueBuffers(player->source, i, player->buffers);
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alSourcePlay(player->source);
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if(alGetError() != AL_NO_ERROR)
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{
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fprintf(stderr, "Error starting playback\n");
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return 0;
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}
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return 1;
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}
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static int UpdatePlayer(StreamPlayer *player)
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{
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ALint processed, state;
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/* Get relevant source info */
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alGetSourcei(player->source, AL_SOURCE_STATE, &state);
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alGetSourcei(player->source, AL_BUFFERS_PROCESSED, &processed);
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if(alGetError() != AL_NO_ERROR)
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{
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fprintf(stderr, "Error checking source state\n");
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return 0;
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}
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/* Unqueue and handle each processed buffer */
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while(processed > 0)
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{
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ALuint bufid;
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size_t got;
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alSourceUnqueueBuffers(player->source, 1, &bufid);
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processed--;
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/* Read the next chunk of data, refill the buffer, and queue it
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* back on the source */
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got = readAVAudioData(player->stream, player->data, player->datasize);
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if(got > 0)
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{
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palBufferSamplesSOFT(bufid, player->rate, player->format,
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BytesToFrames(got, player->channels, player->type),
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player->channels, player->type, player->data);
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alSourceQueueBuffers(player->source, 1, &bufid);
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}
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if(alGetError() != AL_NO_ERROR)
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{
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fprintf(stderr, "Error buffering data\n");
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return 0;
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}
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}
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/* Make sure the source hasn't underrun */
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if(state != AL_PLAYING && state != AL_PAUSED)
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{
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ALint queued;
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/* If no buffers are queued, playback is finished */
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alGetSourcei(player->source, AL_BUFFERS_QUEUED, &queued);
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if(queued == 0)
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return 0;
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alSourcePlay(player->source);
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if(alGetError() != AL_NO_ERROR)
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{
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fprintf(stderr, "Error restarting playback\n");
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return 0;
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}
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}
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return 1;
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}
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int main(int argc, char **argv)
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{
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StreamPlayer *player;
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int i;
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/* Print out usage if no file was specified */
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if(argc < 2)
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{
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fprintf(stderr, "Usage: %s <filenames...>\n", argv[0]);
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return 1;
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}
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if(InitAL() != 0)
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return 1;
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if(alIsExtensionPresent("AL_SOFT_buffer_samples"))
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{
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printf("AL_SOFT_buffer_samples supported!\n");
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palBufferSamplesSOFT = alGetProcAddress("alBufferSamplesSOFT");
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palIsBufferFormatSupportedSOFT = alGetProcAddress("alIsBufferFormatSupportedSOFT");
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}
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else
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printf("AL_SOFT_buffer_samples not supported\n");
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player = NewPlayer();
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/* Play each file listed on the command line */
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for(i = 1;i < argc;i++)
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{
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if(!OpenPlayerFile(player, argv[i]))
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continue;
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fprintf(stderr, "Playing %s (%s, %s, %dhz)\n", argv[i],
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TypeName(player->type), ChannelsName(player->channels),
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player->rate);
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if(!StartPlayer(player))
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{
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ClosePlayerFile(player);
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continue;
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}
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while(UpdatePlayer(player))
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Sleep(10);
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/* All done with this file. Close it and go to the next */
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ClosePlayerFile(player);
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}
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fprintf(stderr, "Done.\n");
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/* All files done. Delete the player, and close OpenAL */
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DeletePlayer(player);
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player = NULL;
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CloseAL();
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return 0;
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}
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