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Remove experimental support for Replaying C32 files (#1294)

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Mark Thompson 2023-07-23 01:52:23 -05:00 • committed by GitHub
parent c4df2e66be
commit 828eb67a52
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5 changed files with 2 additions and 32 deletions
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23
firmware/application/io_convert.cpp
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@ -24,7 +24,6 @@
namespace fs = std::filesystem;
static const fs::path c8_ext = u".C8";
static const fs::path c32_ext = u".C32";
namespace file_convert {
@ -60,41 +59,21 @@ void c8_to_c16(const void* buffer, File::Size bytes) {
}
}
// Convert c32 buffer to c16 buffer.
// Same buffer used for input & output; input size is bytes; output size is bytes/2.
void c32_to_c16(const void* buffer, File::Size bytes) {
complex32_t* src = (complex32_t*)buffer;
complex16_t* dest = (complex16_t*)buffer;
// Shift isn't used here because it would amplify noise at center freq since it's a signed number
// i.e. ((-1 >> 16) << 16) = -65536, whereas (-1 / 65536) * 65536 = 0
for (File::Size i = 0; i < bytes / sizeof(complex32_t); i++) {
auto re_out = src[i].real() / 65536;
auto im_out = src[i].imag() / 65536;
dest[i] = {(int8_t)re_out, (int8_t)im_out};
}
}
} /* namespace file_convert */
// Automatically enables C8/C16 or C32/C16 conversion based on file extension
// Automatically enables C8/C16 conversion based on file extension
Optional<File::Error> FileConvertReader::open(const std::filesystem::path& filename) {
convert_c8_to_c16 = path_iequal(filename.extension(), c8_ext);
convert_c32_to_c16 = path_iequal(filename.extension(), c32_ext);
return file_.open(filename);
}
// If C8 conversion enabled, half the number of bytes are read from the file & expanded to fill the whole buffer.
// If C32 conversion enabled, the full byte count is read from the file, and compressed to half the buffer size.
File::Result<File::Size> FileConvertReader::read(void* const buffer, const File::Size bytes) {
auto read_result = file_.read(buffer, convert_c8_to_c16 ? bytes / 2 : bytes);
if (read_result.is_ok()) {
if (convert_c8_to_c16) {
file_convert::c8_to_c16(buffer, read_result.value());
read_result = read_result.value() * 2;
} else if (convert_c32_to_c16) {
file_convert::c32_to_c16(buffer, read_result.value());
read_result = read_result.value() / 2;
}
bytes_read_ += read_result.value();
}