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Add new auidio back end -- to stdout.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /* | ||
| * pipe output driver. This file is part of Shairport. | ||
| * Copyright (c) James Laird 2013 | ||
| * All rights reserved. | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person | ||
| * obtaining a copy of this software and associated documentation | ||
| * files (the "Software"), to deal in the Software without | ||
| * restriction, including without limitation the rights to use, | ||
| * copy, modify, merge, publish, distribute, sublicense, and/or | ||
| * sell copies of the Software, and to permit persons to whom the | ||
| * Software is furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be | ||
| * included in all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | ||
| * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | ||
| * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
| * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | ||
| * OTHER DEALINGS IN THE SOFTWARE. | ||
| */ | ||
|
|
||
| #include <stdio.h> | ||
| #include <unistd.h> | ||
| #include <fcntl.h> | ||
| #include <memory.h> | ||
| #include <stdlib.h> | ||
| #include <errno.h> | ||
| #include "common.h" | ||
| #include "audio.h" | ||
|
|
||
| static int fd = -1; | ||
|
|
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| static void start(int sample_rate) { | ||
| fd = STDOUT_FILENO; | ||
| } | ||
|
|
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| static void play(short buf[], int samples) { | ||
| int ignore = write(fd, buf, samples * 4); | ||
| } | ||
|
|
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| static void stop(void) { | ||
| // don't close stdout | ||
| } | ||
|
|
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| static int init(int argc, char **argv) { | ||
| const char *str; | ||
| int value; | ||
|
|
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| config.audio_backend_buffer_desired_length = 44100; // one second. | ||
| config.audio_backend_latency_offset = 0; | ||
|
|
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| if (config.cfg != NULL) { | ||
| /* Get the desired buffer size setting. */ | ||
| debug(1,"Get buffer length"); | ||
| if (config_lookup_int(config.cfg, "stdout.audio_backend_buffer_desired_length", &value)) { | ||
| if ((value < 0) || (value > 132300)) | ||
| die("Invalid stdout audio backend buffer desired length \"%d\". It should be between 0 and 132300, default is 44100", | ||
| value); | ||
| else | ||
| config.audio_backend_buffer_desired_length = value; | ||
| } | ||
|
|
||
| /* Get the latency offset. */ | ||
| debug(1,"Get latency"); | ||
| if (config_lookup_int(config.cfg, "stdout.audio_backend_latency_offset", &value)) { | ||
| debug(1,"Got a latency value of %d.",value); | ||
| if ((value < -66150) || (value > 66150)) | ||
| die("Invalid stdout audio backend buffer latency offset \"%d\". It should be between -66150 and +66150, default is 0", | ||
| value); | ||
| else | ||
| config.audio_backend_latency_offset = value; | ||
| } | ||
| } | ||
| debug(1,"buffer: %d, latency: %d.",config.audio_backend_buffer_desired_length,config.audio_backend_latency_offset); | ||
| return 0; | ||
| } | ||
|
|
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| static void deinit(void) { | ||
| // don't close stdout | ||
| } | ||
|
|
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| static void help(void) { | ||
| printf(" stdout takes no arguments\n"); | ||
| } | ||
|
|
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| audio_output audio_stdout = {.name = "stdout", | ||
| .help = &help, | ||
| .init = &init, | ||
| .deinit = &deinit, | ||
| .start = &start, | ||
| .stop = &stop, | ||
| .flush = NULL, | ||
| .delay = NULL, | ||
| .play = &play, | ||
| .volume = NULL, | ||
| .parameters = NULL}; |
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