🛠️🐜 Antkeeper superbuild with dependencies included
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353 lines
10 KiB
353 lines
10 KiB
/*
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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 <SDL_sound.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 "common/alhelpers.h"
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#ifndef SDL_AUDIO_MASK_BITSIZE
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#define SDL_AUDIO_MASK_BITSIZE (0xFF)
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#endif
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#ifndef SDL_AUDIO_BITSIZE
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#define SDL_AUDIO_BITSIZE(x) (x & SDL_AUDIO_MASK_BITSIZE)
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#endif
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/* Define the number of buffers and buffer size (in milliseconds) to use. 4
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* buffers with 200ms each gives a nice per-chunk size, and lets the queue last
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* for almost one second. */
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#define NUM_BUFFERS 4
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#define BUFFER_TIME_MS 200
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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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/* Handle for the audio file */
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Sound_Sample *sample;
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/* The format of the output stream */
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ALenum format;
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ALsizei srate;
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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 = calloc(1, sizeof(*player));
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assert(player != NULL);
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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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Uint32 frame_size;
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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->sample = Sound_NewSampleFromFile(filename, NULL, 0);
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if(!player->sample)
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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(player->sample->actual.channels == 1)
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{
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if(player->sample->actual.format == AUDIO_U8)
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player->format = AL_FORMAT_MONO8;
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else if(player->sample->actual.format == AUDIO_S16SYS)
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player->format = AL_FORMAT_MONO16;
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else
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{
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fprintf(stderr, "Unsupported sample format: 0x%04x\n", player->sample->actual.format);
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goto error;
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}
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}
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else if(player->sample->actual.channels == 2)
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{
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if(player->sample->actual.format == AUDIO_U8)
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player->format = AL_FORMAT_STEREO8;
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else if(player->sample->actual.format == AUDIO_S16SYS)
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player->format = AL_FORMAT_STEREO16;
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else
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{
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fprintf(stderr, "Unsupported sample format: 0x%04x\n", player->sample->actual.format);
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goto error;
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}
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}
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else
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{
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fprintf(stderr, "Unsupported channel count: %d\n", player->sample->actual.channels);
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goto error;
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}
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player->srate = player->sample->actual.rate;
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frame_size = player->sample->actual.channels *
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SDL_AUDIO_BITSIZE(player->sample->actual.format) / 8;
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/* Set the buffer size, given the desired millisecond length. */
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Sound_SetBufferSize(player->sample, (Uint32)((Uint64)player->srate*BUFFER_TIME_MS/1000) *
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frame_size);
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return 1;
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error:
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if(player->sample)
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Sound_FreeSample(player->sample);
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player->sample = NULL;
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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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if(player->sample)
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Sound_FreeSample(player->sample);
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player->sample = NULL;
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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;
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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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Uint32 slen = Sound_Decode(player->sample);
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if(slen == 0) break;
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alBufferData(player->buffers[i], player->format,
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player->sample->buffer, slen, player->srate);
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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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Uint32 slen;
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alSourceUnqueueBuffers(player->source, 1, &bufid);
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processed--;
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if((player->sample->flags&(SOUND_SAMPLEFLAG_EOF|SOUND_SAMPLEFLAG_ERROR)))
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continue;
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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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slen = Sound_Decode(player->sample);
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if(slen > 0)
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{
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alBufferData(bufid, player->format, player->sample->buffer, slen,
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player->srate);
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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 arguments were specified */
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if(argc < 2)
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{
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fprintf(stderr, "Usage: %s [-device <name>] <filenames...>\n", argv[0]);
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return 1;
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}
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argv++; argc--;
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if(InitAL(&argv, &argc) != 0)
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return 1;
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Sound_Init();
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player = NewPlayer();
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/* Play each file listed on the command line */
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for(i = 0;i < argc;i++)
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{
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const char *namepart;
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if(!OpenPlayerFile(player, argv[i]))
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continue;
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/* Get the name portion, without the path, for display. */
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namepart = strrchr(argv[i], '/');
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if(namepart || (namepart=strrchr(argv[i], '\\')))
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namepart++;
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else
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namepart = argv[i];
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printf("Playing: %s (%s, %dhz)\n", namepart, FormatName(player->format),
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player->srate);
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fflush(stdout);
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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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al_nssleep(10000000);
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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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printf("Done.\n");
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/* All files done. Delete the player, and close down SDL_sound and OpenAL */
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DeletePlayer(player);
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player = NULL;
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Sound_Quit();
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CloseAL();
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return 0;
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}
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