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authorMatthias P. Braendli <matthias.braendli@mpb.li>2014-03-07 19:33:48 +0100
committerMatthias P. Braendli <matthias.braendli@mpb.li>2014-03-07 19:33:48 +0100
commit88db1c06124623076b5151eeeea0e8fc5b65caff (patch)
tree9a92cf96a081430ec8a1b6b126f6224a31f6cbe0 /wavreader.c
parent26ebea0262f0664c4cd90664da52f4d9f6a9c8bc (diff)
parentf2444c645b23ba4104d24d9a78dd2ef1f468b0f9 (diff)
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Merge branch 'master' into alsa
Diffstat (limited to 'wavreader.c')
-rw-r--r--wavreader.c220
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;
}