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91 lines
2.8 KiB
91 lines
2.8 KiB
/*****************************************************************************
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* audio_decoder.h : audio decoder interface
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*****************************************************************************
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* Copyright (C) 1999, 2000 VideoLAN
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*
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* Authors:
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*
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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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*
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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 GNU
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* 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
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*****************************************************************************/
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/**** audio decoder API - public audio decoder structures */
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typedef struct audiodec_s audiodec_t;
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typedef struct adec_sync_info_s {
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int sample_rate; /* sample rate in Hz */
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int frame_size; /* frame size in bytes */
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int bit_rate; /* nominal bit rate in kbps */
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} adec_sync_info_t;
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typedef struct adec_byte_stream_s {
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u8 * p_byte;
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u8 * p_end;
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void * info;
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} adec_byte_stream_t;
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/**** audio decoder API - functions publically provided by the audio dec. ****/
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int adec_init (audiodec_t * p_adec);
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int adec_sync_frame (audiodec_t * p_adec, adec_sync_info_t * p_sync_info);
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int adec_decode_frame (audiodec_t * p_adec, s16 * buffer);
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static adec_byte_stream_t * adec_byte_stream (audiodec_t * p_adec);
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/**** audio decoder API - user functions to be provided to the audio dec. ****/
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void adec_byte_stream_next (adec_byte_stream_t * p_byte_stream);
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/**** EVERYTHING AFTER THIS POINT IS PRIVATE ! DO NOT USE DIRECTLY ****/
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/**** audio decoder internal structures ****/
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typedef struct adec_bank_s {
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float v1[512];
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float v2[512];
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float * actual;
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int pos;
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} adec_bank_t;
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typedef struct adec_bit_stream_s {
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u32 buffer;
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int i_available;
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adec_byte_stream_t byte_stream;
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int total_bytes_read;
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} adec_bit_stream_t;
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struct audiodec_s {
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/*
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* Input properties
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*/
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/* The bit stream structure handles the PES stream at the bit level */
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adec_bit_stream_t bit_stream;
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/*
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* Decoder properties
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*/
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u32 header;
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int frame_size;
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adec_bank_t bank_0;
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adec_bank_t bank_1;
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};
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/**** audio decoder inline functions ****/
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static adec_byte_stream_t * adec_byte_stream (audiodec_t * p_adec)
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{
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return &(p_adec->bit_stream.byte_stream);
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}
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