Mercurial > repos > blastem
view wave.c @ 2488:bfd09d3367ba
Fix crash when enabling VGM recording while running Pico or Copera software
author | Michael Pavone <pavone@retrodev.com> |
---|---|
date | Mon, 15 Apr 2024 23:07:18 -0700 |
parents | efc75ea79164 |
children |
line wrap: on
line source
/* Copyright 2013 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include "wave.h" #include <stddef.h> #include <string.h> int wave_init(FILE * f, uint32_t sample_rate, uint16_t bits_per_sample, uint16_t num_channels) { wave_header header; memcpy(header.chunk.id, "RIFF", 4); memcpy(header.chunk.format, "WAVE", 4); header.chunk.size = 0; //This will be filled in later memcpy(header.format_header.id, "fmt ", 4); header.format_header.size = sizeof(wave_header) - (sizeof(header.chunk) + sizeof(header.data_header) + sizeof(header.format_header)); header.audio_format = 1; header.num_channels = num_channels; header.sample_rate = sample_rate; header.byte_rate = sample_rate * num_channels * (bits_per_sample/8); header.block_align = num_channels * (bits_per_sample/8); header.bits_per_sample = bits_per_sample; memcpy(header.data_header.id, "data", 4); header.data_header.size = 0;//This will be filled in later; return fwrite(&header, 1, sizeof(header), f) == sizeof(header); } uint8_t wave_read_header(FILE *f, wave_header *header) { size_t initial_read = sizeof(*header) - sizeof(header->data_header); if (fread(header, 1, initial_read, f) != initial_read) { return 0; } if (memcmp(header->chunk.id, "RIFF", 4)) { return 0; } if (memcmp(header->chunk.format, "WAVE", 4)) { return 0; } if (header->chunk.size < sizeof(*header) - 8) { return 0; } if (memcmp(header->format_header.id, "fmt ", 4)) { return 0; } if (header->format_header.size < sizeof(*header) - sizeof(header->chunk) - sizeof(header->format_header) - sizeof(header->data_header)) { return 0; } fseek(f, header->format_header.size + sizeof(header->chunk) + sizeof(header->format_header), SEEK_SET); if (fread(&header->data_header, 1, sizeof(header->data_header), f) != sizeof(header->data_header)) { return 0; } if (memcmp(header->data_header.id, "data", 4)) { return 0; } return 1; } int wave_finalize(FILE * f) { uint32_t size = ftell(f); fseek(f, offsetof(wave_header, chunk.size), SEEK_SET); size -= 8; if (fwrite(&size, sizeof(size), 1, f) != 1) { fclose(f); return 0; } fseek(f, offsetof(wave_header, data_header.size), SEEK_SET); size -= 36; if (fwrite(&size, sizeof(size), 1, f) != 1) { fclose(f); return 0; } fclose(f); return 1; }