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80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* spek-audio.h
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*
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* Copyright (C) 2010-2012 Alexander Kojevnikov <alexander@kojevnikov.com>
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*
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* Spek 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 3 of the License, or
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* (at your option) any later version.
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*
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* Spek 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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*
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* You should have received a copy of the GNU General Public License
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* along with Spek. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SPEK_AUDIO_H_
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#define SPEK_AUDIO_H_
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#include <stdbool.h>
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#include <stdint.h>
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struct spek_audio_context;
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enum spek_audio_error
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{
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SPEK_AUDIO_OK = 0,
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SPEK_AUDIO_CANNOT_OPEN_FILE,
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SPEK_AUDIO_NO_STREAMS,
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SPEK_AUDIO_NO_AUDIO,
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SPEK_AUDIO_NO_DECODER,
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SPEK_AUDIO_NO_DURATION,
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SPEK_AUDIO_NO_CHANNELS,
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SPEK_AUDIO_CANNOT_OPEN_DECODER,
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SPEK_AUDIO_BAD_SAMPLE_FORMAT,
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};
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struct spek_audio_properties
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{
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char *codec_name;
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enum spek_audio_error error;
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int bit_rate;
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int sample_rate;
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int bits_per_sample;
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int width; // number of bits used to store a sample
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bool fp; // floating-point sample representation
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int channels;
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double duration;
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// TODO: these four guys don't belong here, move them somewhere else when revamping the pipeline
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uint8_t *buffer;
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int64_t frames_per_interval;
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int64_t error_per_interval;
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int64_t error_base;
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};
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// Initialise FFmpeg, should be called once on start up.
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void spek_audio_init();
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// Open the file, check if it has an audio stream which can be decoded.
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// On error, initialises the `error` field in the returned context.
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struct spek_audio_context * spek_audio_open(const char *path);
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const struct spek_audio_properties * spek_audio_get_properties(struct spek_audio_context *cs);
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// Prepare the context for reading audio samples.
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void spek_audio_start(struct spek_audio_context *cx, int samples);
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// Read and decode the opened audio stream.
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// Returns -1 on error, 0 if there's nothing left to read
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// or the number of bytes decoded into the buffer.
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int spek_audio_read(struct spek_audio_context *cx);
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// Closes the file opened with spek_audio_open,
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// frees all allocated buffers and the context
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void spek_audio_close(struct spek_audio_context *cx);
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#endif
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