FreeCalypso > hg > gsm-codec-lib
view libtest/wavwriter.c @ 139:be57e06bed84
factor out common part of gsmfr-cvt-dlcap, in prep for EFR
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 13 Dec 2022 07:03:55 +0000 |
parents | 634df6435e16 |
children |
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/* ------------------------------------------------------------------ * 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 "wavwriter.h" #include <stdio.h> #include <string.h> #include <stdlib.h> #include <stdint.h> struct wav_writer { FILE *wav; int data_length; int sample_rate; int bits_per_sample; int channels; }; static void write_string(struct wav_writer* ww, const char *str) { fputc(str[0], ww->wav); fputc(str[1], ww->wav); fputc(str[2], ww->wav); fputc(str[3], ww->wav); } static void write_int32(struct wav_writer* ww, int value) { fputc((value >> 0) & 0xff, ww->wav); fputc((value >> 8) & 0xff, ww->wav); fputc((value >> 16) & 0xff, ww->wav); fputc((value >> 24) & 0xff, ww->wav); } static void write_int16(struct wav_writer* ww, int value) { fputc((value >> 0) & 0xff, ww->wav); fputc((value >> 8) & 0xff, ww->wav); } static void write_header(struct wav_writer* ww, int length) { int bytes_per_frame, bytes_per_sec; write_string(ww, "RIFF"); write_int32(ww, 4 + 8 + 16 + 8 + length); write_string(ww, "WAVE"); write_string(ww, "fmt "); write_int32(ww, 16); bytes_per_frame = ww->bits_per_sample/8*ww->channels; bytes_per_sec = bytes_per_frame*ww->sample_rate; write_int16(ww, 1); // Format write_int16(ww, ww->channels); // Channels write_int32(ww, ww->sample_rate); // Samplerate write_int32(ww, bytes_per_sec); // Bytes per sec write_int16(ww, bytes_per_frame); // Bytes per frame write_int16(ww, ww->bits_per_sample); // Bits per sample write_string(ww, "data"); write_int32(ww, length); } void* wav_write_open(const char *filename, int sample_rate, int bits_per_sample, int channels) { struct wav_writer* ww = (struct wav_writer*) malloc(sizeof(*ww)); memset(ww, 0, sizeof(*ww)); ww->wav = fopen(filename, "wb"); if (ww->wav == NULL) { free(ww); return NULL; } ww->data_length = 0; ww->sample_rate = sample_rate; ww->bits_per_sample = bits_per_sample; ww->channels = channels; write_header(ww, ww->data_length); return ww; } void wav_write_close(void* obj) { struct wav_writer* ww = (struct wav_writer*) obj; if (ww->wav == NULL) { free(ww); return; } fseek(ww->wav, 0, SEEK_SET); write_header(ww, ww->data_length); fclose(ww->wav); free(ww); } void wav_write_data(void* obj, const unsigned char* data, int length) { struct wav_writer* ww = (struct wav_writer*) obj; if (ww->wav == NULL) return; fwrite(data, length, 1, ww->wav); ww->data_length += length; }