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From: "Kővágó, Zoltán" <dirty.ice.hu@gmail.com>
To: qemu-devel@nongnu.org
Cc: Gerd Hoffmann <kraxel@redhat.com>
Subject: [Qemu-devel] [PATCH 23/25] usb-audio: do not count on avail bytes actually available
Date: Sun, 25 Aug 2019 20:46:25 +0200
Message-ID: <f09fc2df16e0dba25fe1a514b817cb52f97c4c47.1566755452.git.DirtY.iCE.hu@gmail.com> (raw)
In-Reply-To: <cover.1566755452.git.DirtY.iCE.hu@gmail.com>

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

Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
---
 hw/usb/dev-audio.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/hw/usb/dev-audio.c b/hw/usb/dev-audio.c
index ae42e5a2f1..74c99b1f12 100644
--- a/hw/usb/dev-audio.c
+++ b/hw/usb/dev-audio.c
@@ -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;
+        }
     }
 }
 
-- 
2.22.0



  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-25 18:46 [Qemu-devel] [PATCH 00/25] Audio: Mixeng-free 5.1/7.1 audio support Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 01/25] audio: api for mixeng code free backends Kővágó, Zoltán
2019-08-27  5:43   ` Gerd Hoffmann
2019-08-25 18:46 ` [Qemu-devel] [PATCH 02/25] alsaaudio: port to the new audio backend api Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 03/25] coreaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 04/25] dsoundaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 05/25] noaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 06/25] ossaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 07/25] paaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 08/25] sdlaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 10/25] wavaudio: " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 11/25] audio: remove remains of the old " Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 12/25] audio: unify input and output mixeng buffer management Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 13/25] audio: remove hw->samples, buffer_size_in/out pcm_ops Kővágó, Zoltán
2019-08-27  5:48   ` Gerd Hoffmann
2019-08-25 18:46 ` [Qemu-devel] [PATCH 14/25] audio: common rate control code for timer based outputs Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 15/25] audio: split ctl_* functions into enable_* and volume_* Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 16/25] audio: add mixeng option (documentation) Kővágó, Zoltán
2019-08-26 13:35   ` Eric Blake
2019-08-26 20:04     ` Zoltán Kővágó
2019-08-25 18:46 ` [Qemu-devel] [PATCH 17/25] audio: make mixeng optional Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 19/25] audio: support more than two channels in volume setting Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 20/25] audio: replace shift in audio_pcm_info with bytes_per_frame Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 21/25] audio: basic support for multichannel audio Kővágó, Zoltán
2019-08-25 18:46 ` [Qemu-devel] [PATCH 22/25] paaudio: channel-map option Kővágó, Zoltán
2019-08-25 18:46 ` Kővágó, Zoltán [this message]
2019-08-25 18:46 ` [Qemu-devel] [PATCH 25/25] usbaudio: change playback counters to 64 bit Kővágó, Zoltán

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