diff options
Diffstat (limited to 'wavreader.c')
| -rw-r--r-- | wavreader.c | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/wavreader.c b/wavreader.c deleted file mode 100644 index c62a885..0000000 --- a/wavreader.c +++ /dev/null @@ -1,163 +0,0 @@ -/* ------------------------------------------------------------------ - * Copyright (C) 2009 Martin Storsjo - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either - * express or implied. - * See the License for the specific language governing permissions - * and limitations under the License. - * ------------------------------------------------------------------- - */ - -#include "wavreader.h" -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <stdint.h> - -#define TAG(a, b, c, d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) - -struct wav_reader { - FILE *wav; - uint32_t data_length; - - int format; - int sample_rate; - int bits_per_sample; - int channels; - int byte_rate; - int block_align; -}; - -static uint32_t read_tag(struct wav_reader* wr) { - uint32_t tag = 0; - tag = (tag << 8) | fgetc(wr->wav); - tag = (tag << 8) | fgetc(wr->wav); - tag = (tag << 8) | fgetc(wr->wav); - tag = (tag << 8) | fgetc(wr->wav); - return tag; -} - -static uint32_t read_int32(struct wav_reader* wr) { - uint32_t value = 0; - value |= fgetc(wr->wav) << 0; - value |= fgetc(wr->wav) << 8; - value |= fgetc(wr->wav) << 16; - value |= fgetc(wr->wav) << 24; - return value; -} - -static uint16_t read_int16(struct wav_reader* wr) { - uint16_t value = 0; - value |= fgetc(wr->wav) << 0; - value |= fgetc(wr->wav) << 8; - return value; -} - -void* wav_read_open(const char *filename) { - struct wav_reader* wr = (struct wav_reader*) malloc(sizeof(*wr)); - long data_pos = 0; - memset(wr, 0, sizeof(*wr)); - - wr->wav = fopen(filename, "rb"); - if (wr->wav == NULL) { - free(wr); - return NULL; - } - - while (1) { - uint32_t tag, tag2, length; - tag = read_tag(wr); - if (feof(wr->wav)) - break; - length = read_int32(wr); - if (tag != TAG('R', 'I', 'F', 'F') || length < 4) { - fseek(wr->wav, length, SEEK_CUR); - continue; - } - tag2 = read_tag(wr); - length -= 4; - if (tag2 != TAG('W', 'A', 'V', 'E')) { - fseek(wr->wav, length, SEEK_CUR); - continue; - } - // RIFF chunk found, iterate through it - while (length >= 8) { - uint32_t subtag, sublength; - subtag = read_tag(wr); - if (feof(wr->wav)) - break; - sublength = read_int32(wr); - length -= 8; - if (length < sublength) - break; - if (subtag == TAG('f', 'm', 't', ' ')) { - if (sublength < 16) { - // Insufficient data for 'fmt ' - break; - } - wr->format = read_int16(wr); - wr->channels = read_int16(wr); - wr->sample_rate = read_int32(wr); - wr->byte_rate = read_int32(wr); - wr->block_align = read_int16(wr); - wr->bits_per_sample = read_int16(wr); - fseek(wr->wav, sublength - 16, SEEK_CUR); - } else if (subtag == TAG('d', 'a', 't', 'a')) { - data_pos = ftell(wr->wav); - wr->data_length = sublength; - fseek(wr->wav, sublength, SEEK_CUR); - } else { - fseek(wr->wav, sublength, SEEK_CUR); - } - length -= sublength; - } - if (length > 0) { - // Bad chunk? - fseek(wr->wav, length, SEEK_CUR); - } - } - fseek(wr->wav, data_pos, SEEK_SET); - return wr; -} - -void wav_read_close(void* obj) { - struct wav_reader* wr = (struct wav_reader*) obj; - fclose(wr->wav); - free(wr); -} - -int wav_get_header(void* obj, int* format, int* channels, int* sample_rate, int* bits_per_sample, unsigned int* data_length) { - struct wav_reader* wr = (struct wav_reader*) obj; - if (format) - *format = wr->format; - if (channels) - *channels = wr->channels; - if (sample_rate) - *sample_rate = wr->sample_rate; - if (bits_per_sample) - *bits_per_sample = wr->bits_per_sample; - if (data_length) - *data_length = wr->data_length; - return wr->format && wr->sample_rate; -} - -int wav_read_data(void* obj, unsigned char* data, unsigned int length) { - struct wav_reader* wr = (struct wav_reader*) obj; - int n; - if (wr->wav == NULL) - return -1; - if (length > wr->data_length) - length = wr->data_length; - n = fread(data, 1, length, wr->wav); - wr->data_length -= length; - return n; -} - |