diff options
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | cswave.c | 101 |
2 files changed, 100 insertions, 3 deletions
@@ -5,6 +5,8 @@ all: cswave cswave.exe cswave: cswave.c cswave.exe: export CC = x86_64-w64-mingw32-gcc +cswave.exe: cswave.c + $(CC) $(CFLAGS) $(LDFLAGS) $< $(OBJS) $(LDLIBS) -o $@ clean: $(RM) *.o @@ -8,8 +8,72 @@ #include <sys/stat.h> #include <fcntl.h> #include <inttypes.h> +#include <math.h> + +#ifdef _WIN32 + #define WIN32_LEAN_AND_MEAN + #include <windows.h> + #include <winsock2.h> + #define PRIsize_t "Iu" + #define htole16(x) (x) + #define htole32(x) (x) +#define GETLINE_BUFFER 4096 + +//getline implementation from midimonster / https://github.com/cbdevnet/midimonster +static ssize_t getline(char** line, size_t* alloc, FILE* stream){ + size_t bytes_read = 0; + char c; + //sanity checks + if(!line || !alloc || !stream){ + return -1; + } + + //allocate buffer if none provided + if(!*line || !*alloc){ + *alloc = GETLINE_BUFFER; + *line = calloc(GETLINE_BUFFER, sizeof(char)); + if(!*line){ + fprintf(stderr, "Failed to allocate memory\n"); + return -1; + } + } + + if(feof(stream)){ + return -1; + } + + for(c = fgetc(stream); 1; c = fgetc(stream)){ + //end of buffer, resize + if(bytes_read == (*alloc) - 1){ + *alloc += GETLINE_BUFFER; + *line = realloc(*line, (*alloc) * sizeof(char)); + if(!*line){ + fprintf(stderr, "Failed to allocate memory\n"); + return -1; + } + } -#define PRIsize_t "lu" + //store character + (*line)[bytes_read] = c; + + //end of line + if(feof(stream) || c == '\n'){ + //terminate string + (*line)[bytes_read + 1] = 0; + return bytes_read; + } + + //input broken + if(ferror(stream)){ + return -1; + } + + bytes_read++; + } +} +#else + #define PRIsize_t "lu" +#endif typedef enum { fmt_i8, @@ -152,6 +216,25 @@ static size_t process(FILE* src, size_t column, sample_format fmt, int dst){ return samples; } +static float* float_reference(int fd, size_t samples){ + float* data = calloc(samples, sizeof(float)), max = 0; + size_t n = 0; + + for(n = 0; n < samples; n++){ + read(fd, data + n, 4); + if(fabsf(data[n]) > fabsf(max)){ + max = data[n]; + } + } + + fprintf(stdout, "Determined maximum sample value as %f\n", max); + + for(n = 0; n < samples; n++){ + data[n] /= fabsf(max); + } + return data; +} + static void write_headers(int fd, sample_format fmt, size_t samples, size_t samplerate){ hdr_riff_t riff_hdr = { .magic_riff = "RIFF", @@ -208,7 +291,7 @@ int main(int argc, char** argv){ return EXIT_FAILURE; } - int output_fd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); + int output_fd = open(argv[2], O_RDWR | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); if(output_fd < 0){ fprintf(stderr, "Failed to open output file %s\n", argv[2]); close(output_fd); @@ -223,7 +306,19 @@ int main(int argc, char** argv){ lseek(output_fd, 0, SEEK_SET); write_headers(output_fd, fmt, samples, strtoul(argv[4], NULL, 10)); - //TODO normalize floats + + //floating point pcm needs to be normalized... + if(fmt == fmt_f32){ + float* normalized = float_reference(output_fd, samples); + lseek(output_fd, 0, SEEK_SET); + write_headers(output_fd, fmt, samples, strtoul(argv[4], NULL, 10)); + for(size_t n = 0; n < samples; n++){ + write(output_fd, normalized + n, 4); + //fprintf(stdout, "Normalized sample %f\n", normalized[n]); + } + free(normalized); + } + close(output_fd); return EXIT_SUCCESS; } |