6b8e84844a
- Mixing still isn't implemented, but the audio system should be able to start up, and mix at least once audio line for the time being. Will have to write some test audio sources to verify things are working properly, and build the rest of the output functionality.
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/******************************************************************************
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Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#pragma once
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#include "../util/c99defs.h"
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#include "media-io.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Base audio output component. Use this to create an audio output track
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* for the media.
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*/
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struct audio_output;
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struct audio_line;
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typedef struct audio_output *audio_t;
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typedef struct audio_line *audio_line_t;
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enum audio_format {
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AUDIO_FORMAT_UNKNOWN,
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AUDIO_FORMAT_U8BIT,
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AUDIO_FORMAT_16BIT,
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AUDIO_FORMAT_32BIT,
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AUDIO_FORMAT_FLOAT,
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};
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enum speaker_layout {
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SPEAKERS_UNKNOWN,
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SPEAKERS_MONO,
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SPEAKERS_STEREO,
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SPEAKERS_2POINT1,
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SPEAKERS_QUAD,
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SPEAKERS_4POINT1,
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SPEAKERS_5POINT1,
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SPEAKERS_5POINT1_SURROUND,
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SPEAKERS_7POINT1,
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SPEAKERS_7POINT1_SURROUND,
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SPEAKERS_SURROUND,
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};
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struct audio_data {
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const void *data;
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uint32_t frames;
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uint64_t timestamp;
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float volume;
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};
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struct audio_info {
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const char *name;
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uint32_t samples_per_sec;
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enum audio_format format;
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enum speaker_layout speakers;
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uint64_t buffer_ms;
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};
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static inline uint32_t get_audio_channels(enum speaker_layout speakers)
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{
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switch (speakers) {
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case SPEAKERS_MONO: return 1;
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case SPEAKERS_STEREO: return 2;
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case SPEAKERS_2POINT1: return 3;
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case SPEAKERS_SURROUND:
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case SPEAKERS_QUAD: return 4;
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case SPEAKERS_4POINT1: return 5;
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case SPEAKERS_5POINT1:
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case SPEAKERS_5POINT1_SURROUND: return 6;
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case SPEAKERS_7POINT1: return 8;
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case SPEAKERS_7POINT1_SURROUND: return 8;
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case SPEAKERS_UNKNOWN: return 0;
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}
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return 0;
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}
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static inline size_t get_audio_bytes_per_channel(enum audio_format type)
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{
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switch (type) {
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case AUDIO_FORMAT_U8BIT: return 1;
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case AUDIO_FORMAT_16BIT: return 2;
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case AUDIO_FORMAT_FLOAT:
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case AUDIO_FORMAT_32BIT: return 4;
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case AUDIO_FORMAT_UNKNOWN: return 0;
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}
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return 0;
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}
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static inline size_t get_audio_size(enum audio_format type,
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enum speaker_layout speakers, uint32_t frames)
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{
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return get_audio_channels(speakers) *
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get_audio_bytes_per_channel(type) *
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frames;
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}
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#define AUDIO_OUTPUT_SUCCESS 0
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#define AUDIO_OUTPUT_INVALIDPARAM -1
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#define AUDIO_OUTPUT_FAIL -2
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EXPORT int audio_output_open(audio_t *audio, media_t media,
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struct audio_info *info);
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EXPORT audio_line_t audio_output_createline(audio_t audio, const char *name);
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EXPORT size_t audio_output_blocksize(audio_t audio);
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EXPORT const struct audio_info *audio_output_getinfo(audio_t audio);
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EXPORT void audio_output_close(audio_t audio);
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EXPORT void audio_line_destroy(audio_line_t line);
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EXPORT void audio_line_output(audio_line_t line, const struct audio_data *data);
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#ifdef __cplusplus
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}
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#endif
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