audio fixes + initial audio capture support (malc)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2040 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 101 insertions, 0 deletions

diff --git a/audio/wavcapture.c b/audio/wavcapture.c
new file mode 100644
index 0000000000..33f04c50b3
--- /dev/null
+++ b/audio/wavcapture.c
@@ -0,0 +1,101 @@
+#include "vl.h"
+
+typedef struct {
+    QEMUFile *f;
+    int bytes;
+} WAVState;
+
+/* VICE code: Store number as little endian. */
+static void le_store (uint8_t *buf, uint32_t val, int len)
+{
+    int i;
+    for (i = 0; i < len; i++) {
+        buf[i] = (uint8_t) (val & 0xff);
+        val >>= 8;
+    }
+}
+
+static void wav_state_cb (void *opaque, int enabled)
+{
+    WAVState *wav = opaque;
+
+    if (!enabled) {
+        uint8_t rlen[4];
+        uint8_t dlen[4];
+        uint32_t datalen = wav->bytes;
+        uint32_t rifflen = datalen + 36;
+
+        if (!wav->f) {
+            return;
+        }
+
+        le_store (rlen, rifflen, 4);
+        le_store (dlen, datalen, 4);
+
+        qemu_fseek (wav->f, 4, SEEK_SET);
+        qemu_put_buffer (wav->f, rlen, 4);
+
+        qemu_fseek (wav->f, 32, SEEK_CUR);
+        qemu_put_buffer (wav->f, dlen, 4);
+    }
+    else {
+        qemu_fseek (wav->f, 0, SEEK_END);
+    }
+}
+
+static void wav_capture_cb (void *opaque, void *buf, int size)
+{
+    WAVState *wav = opaque;
+
+    qemu_put_buffer (wav->f, buf, size);
+    wav->bytes += size;
+}
+
+void wav_capture (const char *path, int freq, int bits16, int stereo)
+{
+    WAVState *wav;
+    uint8_t hdr[] = {
+        0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x41, 0x56,
+        0x45, 0x66, 0x6d, 0x74, 0x20, 0x10, 0x00, 0x00, 0x00, 0x01, 0x00,
+        0x02, 0x00, 0x44, 0xac, 0x00, 0x00, 0x10, 0xb1, 0x02, 0x00, 0x04,
+        0x00, 0x10, 0x00, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00, 0x00
+    };
+    audsettings_t as;
+    struct audio_capture_ops ops;
+    int shift;
+
+    stereo = !!stereo;
+    bits16 = !!bits16;
+
+    as.freq = freq;
+    as.nchannels = 1 << stereo;
+    as.fmt = bits16 ? AUD_FMT_S16 : AUD_FMT_U8;
+
+    ops.state = wav_state_cb;
+    ops.capture = wav_capture_cb;
+
+    wav = qemu_mallocz (sizeof (*wav));
+    if (!wav) {
+        AUD_log ("wav", "Could not allocate memory (%zu bytes)", sizeof (*wav));
+        return;
+    }
+
+    shift = bits16 + stereo;
+    hdr[34] = bits16 ? 0x10 : 0x08;
+
+    le_store (hdr + 22, as.nchannels, 2);
+    le_store (hdr + 24, freq, 4);
+    le_store (hdr + 28, freq << shift, 4);
+    le_store (hdr + 32, 1 << shift, 2);
+
+    wav->f = fopen (path, "wb");
+    if (!wav->f) {
+        AUD_log ("wav", "Failed to open wave file `%s'\nReason: %s\n",
+                 path, strerror (errno));
+        qemu_free (wav);
+        return;
+    }
+
+    qemu_put_buffer (wav->f, hdr, sizeof (hdr));
+    AUD_add_capture (NULL, &as, 0, &ops, wav);
+}