Mercurial > repos > blastem
diff wave.c @ 407:c3abc4ada43d
Add support for logging YM2612 channels to WAVE files
author | Mike Pavone <pavone@retrodev.com> |
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date | Sun, 16 Jun 2013 17:57:57 -0700 |
parents | |
children | 140af5509ce7 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/wave.c Sun Jun 16 17:57:57 2013 -0700 @@ -0,0 +1,41 @@ +#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); +} + +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) != sizeof(size)) { + fclose(f); + return 0; + } + fseek(f, offsetof(wave_header, data_header.size), SEEK_SET); + size -= 36; + if (fwrite(&size, sizeof(size), 1, f)) { + fclose(f); + return 0; + } + fclose(f); + return 1; +}