diff options
Diffstat (limited to 'wavreader.c')
| -rw-r--r-- | wavreader.c | 220 |
1 files changed, 110 insertions, 110 deletions
diff --git a/wavreader.c b/wavreader.c index f672001..c62a885 100644 --- a/wavreader.c +++ b/wavreader.c @@ -25,139 +25,139 @@ #define TAG(a, b, c, d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) struct wav_reader { - FILE *wav; - uint32_t data_length; + FILE *wav; + uint32_t data_length; - int format; - int sample_rate; - int bits_per_sample; - int channels; - int byte_rate; - int block_align; + int format; + int sample_rate; + int bits_per_sample; + int channels; + int byte_rate; + int block_align; }; static uint32_t read_tag(struct wav_reader* wr) { - uint32_t tag = 0; - tag = (tag << 8) | fgetc(wr->wav); - tag = (tag << 8) | fgetc(wr->wav); - tag = (tag << 8) | fgetc(wr->wav); - tag = (tag << 8) | fgetc(wr->wav); - return tag; + uint32_t tag = 0; + tag = (tag << 8) | fgetc(wr->wav); + tag = (tag << 8) | fgetc(wr->wav); + tag = (tag << 8) | fgetc(wr->wav); + tag = (tag << 8) | fgetc(wr->wav); + return tag; } static uint32_t read_int32(struct wav_reader* wr) { - uint32_t value = 0; - value |= fgetc(wr->wav) << 0; - value |= fgetc(wr->wav) << 8; - value |= fgetc(wr->wav) << 16; - value |= fgetc(wr->wav) << 24; - return value; + uint32_t value = 0; + value |= fgetc(wr->wav) << 0; + value |= fgetc(wr->wav) << 8; + value |= fgetc(wr->wav) << 16; + value |= fgetc(wr->wav) << 24; + return value; } static uint16_t read_int16(struct wav_reader* wr) { - uint16_t value = 0; - value |= fgetc(wr->wav) << 0; - value |= fgetc(wr->wav) << 8; - return value; + uint16_t value = 0; + value |= fgetc(wr->wav) << 0; + value |= fgetc(wr->wav) << 8; + return value; } void* wav_read_open(const char *filename) { - struct wav_reader* wr = (struct wav_reader*) malloc(sizeof(*wr)); - long data_pos = 0; - memset(wr, 0, sizeof(*wr)); + struct wav_reader* wr = (struct wav_reader*) malloc(sizeof(*wr)); + long data_pos = 0; + memset(wr, 0, sizeof(*wr)); - wr->wav = fopen(filename, "rb"); - if (wr->wav == NULL) { - free(wr); - return NULL; - } + wr->wav = fopen(filename, "rb"); + if (wr->wav == NULL) { + free(wr); + return NULL; + } - while (1) { - uint32_t tag, tag2, length; - tag = read_tag(wr); - if (feof(wr->wav)) - break; - length = read_int32(wr); - if (tag != TAG('R', 'I', 'F', 'F') || length < 4) { - fseek(wr->wav, length, SEEK_CUR); - continue; - } - tag2 = read_tag(wr); - length -= 4; - if (tag2 != TAG('W', 'A', 'V', 'E')) { - fseek(wr->wav, length, SEEK_CUR); - continue; - } - // RIFF chunk found, iterate through it - while (length >= 8) { - uint32_t subtag, sublength; - subtag = read_tag(wr); - if (feof(wr->wav)) - break; - sublength = read_int32(wr); - length -= 8; - if (length < sublength) - break; - if (subtag == TAG('f', 'm', 't', ' ')) { - if (sublength < 16) { - // Insufficient data for 'fmt ' - break; - } - wr->format = read_int16(wr); - wr->channels = read_int16(wr); - wr->sample_rate = read_int32(wr); - wr->byte_rate = read_int32(wr); - wr->block_align = read_int16(wr); - wr->bits_per_sample = read_int16(wr); - fseek(wr->wav, sublength - 16, SEEK_CUR); - } else if (subtag == TAG('d', 'a', 't', 'a')) { - data_pos = ftell(wr->wav); - wr->data_length = sublength; - fseek(wr->wav, sublength, SEEK_CUR); - } else { - fseek(wr->wav, sublength, SEEK_CUR); - } - length -= sublength; - } - if (length > 0) { - // Bad chunk? - fseek(wr->wav, length, SEEK_CUR); - } - } - fseek(wr->wav, data_pos, SEEK_SET); - return wr; + while (1) { + uint32_t tag, tag2, length; + tag = read_tag(wr); + if (feof(wr->wav)) + break; + length = read_int32(wr); + if (tag != TAG('R', 'I', 'F', 'F') || length < 4) { + fseek(wr->wav, length, SEEK_CUR); + continue; + } + tag2 = read_tag(wr); + length -= 4; + if (tag2 != TAG('W', 'A', 'V', 'E')) { + fseek(wr->wav, length, SEEK_CUR); + continue; + } + // RIFF chunk found, iterate through it + while (length >= 8) { + uint32_t subtag, sublength; + subtag = read_tag(wr); + if (feof(wr->wav)) + break; + sublength = read_int32(wr); + length -= 8; + if (length < sublength) + break; + if (subtag == TAG('f', 'm', 't', ' ')) { + if (sublength < 16) { + // Insufficient data for 'fmt ' + break; + } + wr->format = read_int16(wr); + wr->channels = read_int16(wr); + wr->sample_rate = read_int32(wr); + wr->byte_rate = read_int32(wr); + wr->block_align = read_int16(wr); + wr->bits_per_sample = read_int16(wr); + fseek(wr->wav, sublength - 16, SEEK_CUR); + } else if (subtag == TAG('d', 'a', 't', 'a')) { + data_pos = ftell(wr->wav); + wr->data_length = sublength; + fseek(wr->wav, sublength, SEEK_CUR); + } else { + fseek(wr->wav, sublength, SEEK_CUR); + } + length -= sublength; + } + if (length > 0) { + // Bad chunk? + fseek(wr->wav, length, SEEK_CUR); + } + } + fseek(wr->wav, data_pos, SEEK_SET); + return wr; } void wav_read_close(void* obj) { - struct wav_reader* wr = (struct wav_reader*) obj; - fclose(wr->wav); - free(wr); + struct wav_reader* wr = (struct wav_reader*) obj; + fclose(wr->wav); + free(wr); } int wav_get_header(void* obj, int* format, int* channels, int* sample_rate, int* bits_per_sample, unsigned int* data_length) { - struct wav_reader* wr = (struct wav_reader*) obj; - if (format) - *format = wr->format; - if (channels) - *channels = wr->channels; - if (sample_rate) - *sample_rate = wr->sample_rate; - if (bits_per_sample) - *bits_per_sample = wr->bits_per_sample; - if (data_length) - *data_length = wr->data_length; - return wr->format && wr->sample_rate; + struct wav_reader* wr = (struct wav_reader*) obj; + if (format) + *format = wr->format; + if (channels) + *channels = wr->channels; + if (sample_rate) + *sample_rate = wr->sample_rate; + if (bits_per_sample) + *bits_per_sample = wr->bits_per_sample; + if (data_length) + *data_length = wr->data_length; + return wr->format && wr->sample_rate; } int wav_read_data(void* obj, unsigned char* data, unsigned int length) { - struct wav_reader* wr = (struct wav_reader*) obj; - int n; - if (wr->wav == NULL) - return -1; - if (length > wr->data_length) - length = wr->data_length; - n = fread(data, 1, length, wr->wav); - wr->data_length -= length; - return n; + struct wav_reader* wr = (struct wav_reader*) obj; + int n; + if (wr->wav == NULL) + return -1; + if (length > wr->data_length) + length = wr->data_length; + n = fread(data, 1, length, wr->wav); + wr->data_length -= length; + return n; } |