audio fixes (malc)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1133 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/audio/noaudio.c b/audio/noaudio.c
new file mode 100644
index 0000000..819de1e
--- /dev/null
+++ b/audio/noaudio.c
@@ -0,0 +1,130 @@
+/*
+ * QEMU NULL audio output driver
+ *
+ * Copyright (c) 2004 Vassili Karpov (malc)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "vl.h"
+
+#include "audio/audio_int.h"
+
+typedef struct NoVoice {
+ HWVoice hw;
+ int64_t old_ticks;
+} NoVoice;
+
+#define dolog(...) AUD_log ("noaudio", __VA_ARGS__)
+#ifdef DEBUG
+#define ldebug(...) dolog (__VA_ARGS__)
+#else
+#define ldebug(...)
+#endif
+
+static void no_hw_run (HWVoice *hw)
+{
+ NoVoice *no = (NoVoice *) hw;
+ int rpos, live, decr, samples;
+ uint8_t *dst;
+ st_sample_t *src;
+ int64_t now = qemu_get_clock (vm_clock);
+ int64_t ticks = now - no->old_ticks;
+ int64_t bytes = (ticks * hw->bytes_per_second) / ticks_per_sec;
+
+ if (bytes > INT_MAX)
+ samples = INT_MAX >> hw->shift;
+ else
+ samples = bytes >> hw->shift;
+
+ live = pcm_hw_get_live (hw);
+ if (live <= 0)
+ return;
+
+ no->old_ticks = now;
+ decr = audio_MIN (live, samples);
+ samples = decr;
+ rpos = hw->rpos;
+ while (samples) {
+ int left_till_end_samples = hw->samples - rpos;
+ int convert_samples = audio_MIN (samples, left_till_end_samples);
+
+ src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
+ memset (src, 0, convert_samples * sizeof (st_sample_t));
+
+ rpos = (rpos + convert_samples) % hw->samples;
+ samples -= convert_samples;
+ }
+
+ pcm_hw_dec_live (hw, decr);
+ hw->rpos = rpos;
+}
+
+static int no_hw_write (SWVoice *sw, void *buf, int len)
+{
+ return pcm_hw_write (sw, buf, len);
+}
+
+static int no_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
+{
+ NoVoice *no = (NoVoice *) hw;
+ hw->freq = freq;
+ hw->nchannels = nchannels;
+ hw->fmt = fmt;
+ hw->bufsize = 4096;
+ return 0;
+}
+
+static void no_hw_fini (HWVoice *hw)
+{
+ (void) hw;
+}
+
+static int no_hw_ctl (HWVoice *hw, int cmd, ...)
+{
+ (void) hw;
+ (void) cmd;
+ return 0;
+}
+
+static void *no_audio_init (void)
+{
+ return &no_audio_init;
+}
+
+static void no_audio_fini (void *opaque)
+{
+}
+
+struct pcm_ops no_pcm_ops = {
+ no_hw_init,
+ no_hw_fini,
+ no_hw_run,
+ no_hw_write,
+ no_hw_ctl
+};
+
+struct audio_output_driver no_output_driver = {
+ "none",
+ no_audio_init,
+ no_audio_fini,
+ &no_pcm_ops,
+ 1,
+ 1,
+ sizeof (NoVoice)
+};
