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usb-audio: do not count on avail bytes actually available 

This assumption is no longer true when mixeng is turned off.

Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
Message-id: d63f4d39a0ee7a2e4e7e4a2eb005ba79120eaf1d.1570996490.git.DirtY.iCE.hu@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Kővágó, Zoltán 2019-10-13 21:58:04 +02:00 committed by Gerd Hoffmann
parent b5c7db3eef
commit 2c6a740f6b
1 changed files with 18 additions and 12 deletions
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30
hw/usb/dev-audio.c
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@ -319,30 +319,31 @@ static int streambuf_put(struct streambuf *buf, USBPacket *p)
{
uint32_t free = buf->size - (buf->prod - buf->cons);
if (!free) {
if (free < USBAUDIO_PACKET_SIZE) {
return 0;
}
if (p->iov.size != USBAUDIO_PACKET_SIZE) {
return 0;
}
assert(free >= USBAUDIO_PACKET_SIZE);
usb_packet_copy(p, buf->data + (buf->prod % buf->size),
USBAUDIO_PACKET_SIZE);
buf->prod += USBAUDIO_PACKET_SIZE;
return USBAUDIO_PACKET_SIZE;
}
static uint8_t *streambuf_get(struct streambuf *buf)
static uint8_t *streambuf_get(struct streambuf *buf, size_t *len)
{
uint32_t used = buf->prod - buf->cons;
uint8_t *data;
if (!used) {
*len = 0;
return NULL;
}
assert(used >= USBAUDIO_PACKET_SIZE);
data = buf->data + (buf->cons % buf->size);
buf->cons += USBAUDIO_PACKET_SIZE;
*len = MIN(buf->prod - buf->cons,
buf->size - (buf->cons % buf->size));
return data;
}
@ -374,16 +375,21 @@ 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);
while (avail) {
size_t written, len;
data = streambuf_get(&s->out.buf, &len);
if (!data) {
return;
}
AUD_write(s->out.voice, data, USBAUDIO_PACKET_SIZE);
avail -= USBAUDIO_PACKET_SIZE;
written = AUD_write(s->out.voice, data, len);
avail -= written;
s->out.buf.cons += written;
if (written < len) {
return;
}
}
}