55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
//
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// g719.c
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// g719
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//
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// Created by Christopher Snowhill on 1/24/15.
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// Copyright (c) 2021-2023 Christopher Snowhill. All rights reserved.
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//
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#include <stdlib.h>
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#include "g719.h"
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#include "proto.h"
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#include "stack_alloc.h"
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struct g719_handle_s
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{
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DecoderState state;
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int num_bits;
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};
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g719_handle * g719_init(int bytes_per_frame)
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{
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g719_handle * handle = (g719_handle *) malloc(sizeof(struct g719_handle_s));
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if (handle)
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{
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handle->num_bits = bytes_per_frame * 8;
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decoder_init(&handle->state, bytes_per_frame * 8);
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}
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return handle;
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}
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void g719_decode_frame(g719_handle *handle, void *code_words, void *sample_buffer)
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{
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int i, j;
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VARDECL(short, code_bits);
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ALLOC(code_bits, handle->num_bits, short);
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for (i = 0, j = handle->num_bits; i < j; i++)
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{
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code_bits[i] = ((((unsigned char *)code_words)[i / 8] >> (i & 7)) & 1) ? G192_BIT1 : G192_BIT0;
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}
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decode_frame((short *)code_bits, 0, (short *)sample_buffer, &handle->state);
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}
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void g719_reset(g719_handle *handle)
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{
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decoder_reset_tables(&handle->state, handle->num_bits);
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}
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void g719_free(g719_handle *handle)
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{
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free(handle);
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}
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