static void output_callback(void *opaque, int avail)
{
USBAudioState *s = opaque;
uint8_t *data;
for (;;) {
if (avail < USBAUDIO_PACKET_SIZE) {
return;
}
data = streambuf_get(&s->out.buf);
if (!data) {
return;
}
AUD_write(s->out.voice, data, USBAUDIO_PACKET_SIZE);
avail -= USBAUDIO_PACKET_SIZE;
}
}
/* Read a crypted packet from the stream.
* The buffer is dynamically allocated, so
* calling function has to free it.
*/
static int32 read_packet(u_char **buffer, struct stream_buf *dbuf)
{
int32 length, mod;
/* Read packet length and calculate modulus */
if (streambuf_read(dbuf, (u_char *)&length, 4, STREAM_ATOMIC) == -EINVALID)
return -EINVALID;
length = ntohl(length);
mod = 8 - (length % 8);
/* Allocate the buffer and read the whole packet
* SAFE_CALLOC is not good to handle errors.
*/
*buffer = (u_char *)malloc(length + mod + 4);
if (*buffer == NULL)
return -EINVALID;
if (streambuf_get(dbuf, *buffer, length + mod + 4, STREAM_ATOMIC) == -EINVALID) {
SAFE_FREE(*buffer);
return -EINVALID;
}
return ESUCCESS;
}
