int ogv_demuxer_process() {
do {
// read at most this many bytes in one go
// should be enough to resync ogg stream
int64_t headroom = bq_headroom(bufferQueue);
size_t bufsize = 65536;
if (headroom < bufsize) {
bufsize = headroom;
}
int ret = oggz_read(oggz, bufsize);
//printf("demuxer returned %d on %d bytes\n", ret, bufsize);
if (ret == OGGZ_ERR_STOP_OK) {
// We got a packet!
return 1;
} else if (ret > 0) {
// We read some data, but no packets yet.
//printf("read %d bytes\n", ret);
continue;
} else if (ret == 0) {
//printf("EOF %d from oggz_read\n", ret);
return 0;
} else if (ret < 0) {
printf("Error %d from oggz_read\n", ret);
return 0;
}
} while(1);
return 0;
}
int bq_read(BufferQueue *queue, char *data, size_t len) {
if (bq_headroom(queue) < len) {
return -1;
}
size_t offset = 0;
size_t remaining = len;
for (int i = 0; i < queue->len; i++) {
if (queue->items[i].start + queue->items[i].len < queue->pos) {
//printf("bq_read skipped item at pos %lld len %d\n", queue->items[i].start, queue->items[i].len);
continue;
}
size_t chunkStart = queue->pos - queue->items[i].start;
size_t chunkLen = queue->items[i].len - chunkStart;
if (chunkLen > remaining) {
chunkLen = remaining;
}
memcpy(data + offset, queue->items[i].bytes + chunkStart, chunkLen);
//printf("bq_read copy chunkStart %d chunkLen %d to offset %d; from item %d start %lld len %d (pos %lld)\n", chunkStart, chunkLen, offset, i, queue->items[i].start, queue->items[i].len, queue->pos);
queue->pos += chunkLen;
offset += chunkLen;
remaining -= chunkLen;
if (remaining <= 0) {
return 0;
}
}
return -1;
}
static size_t readCallback(void *user_handle, void *buf, size_t n)
{
BufferQueue *bq = (BufferQueue *)user_handle;
size_t available = bq_headroom(bq);
size_t to_read;
if (n < available) {
to_read = n;
} else {
to_read = available;
}
int ret = bq_read(bq, buf, to_read);
if (ret < 0) {
return -1;
} else {
return to_read;
}
}
