DART audio output driver for OS/2 by KO Myung-Hun, komh chollian net

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28775 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 334 insertions, 0 deletions

diff --git a/libao2/ao_dart.c b/libao2/ao_dart.c
new file mode 100644
index 0000000000..95efa04946
--- /dev/null
+++ b/libao2/ao_dart.c
@@ -0,0 +1,334 @@
+/*
+ * OS/2 DART audio output driver
+ *
+ * Copyright (c) 2007-2009 by KO Myung-Hun (komh@chollian.net)
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define INCL_DOS
+#define INCL_DOSERRORS
+#include <os2.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <float.h>
+
+#include <dart.h>
+
+#include "config.h"
+#include "libaf/af_format.h"
+#include "audio_out.h"
+#include "audio_out_internal.h"
+#include "mp_msg.h"
+#include "libvo/fastmemcpy.h"
+#include "subopt-helper.h"
+
+static ao_info_t info = {
+    "DART audio output",
+    "dart",
+    "KO Myung-Hun <komh@chollian.net>",
+    ""
+};
+
+LIBAO_EXTERN(dart)
+
+#define OUTBURST_SAMPLES        512
+#define DEFAULT_DART_SAMPLES    (OUTBURST_SAMPLES << 2)
+
+#define CHUNK_SIZE  ao_data.outburst
+
+static uint8_t *m_audioBuf = NULL;
+
+static int m_nBufSize = 0;
+
+static volatile int m_fQuit = FALSE;
+// may only be modified by DART's playback thread or while it is stopped
+static volatile int m_iBufReadPos = 0;
+// may only be modified by MPlayer's thread
+static volatile int m_iBufWritePos = 0;
+
+// may only be called by MPlayer's thread
+// return value may change between immediately following two calls,
+// and the real number of free bytes might be larger!
+static int buf_free(void)
+{
+    int nFree = m_iBufReadPos - m_iBufWritePos - CHUNK_SIZE;
+
+    if (nFree < 0)
+        nFree += m_nBufSize;
+
+    return nFree;
+}
+
+// may only be called by DART's playback thread
+// return value may change between immediately following two calls,
+// and the real number of buffered bytes might be larger!
+static int buf_used(void)
+{
+    int nUsed = m_iBufWritePos - m_iBufReadPos;
+
+    if (nUsed < 0)
+        nUsed += m_nBufSize;
+
+    return nUsed;
+}
+
+static int write_buffer(unsigned char *data, int len)
+{
+    int nFirstLen = m_nBufSize - m_iBufWritePos;
+    int nFree = buf_free();
+
+    if (len > nFree)
+        len = nFree;
+
+    if (nFirstLen > len)
+        nFirstLen = len;
+
+    // till end of buffer
+    fast_memcpy(m_audioBuf + m_iBufWritePos, data, nFirstLen);
+    if (len > nFirstLen) { // we have to wrap around
+        // remaining part from beginning of buffer
+        fast_memcpy(m_audioBuf, data + nFirstLen, len - nFirstLen);
+    }
+
+    m_iBufWritePos = (m_iBufWritePos + len) % m_nBufSize;
+
+    return len;
+}
+
+static int read_buffer(unsigned char *data, int len)
+{
+    int nFirstLen = m_nBufSize - m_iBufReadPos;
+    int nBuffered = buf_used();
+
+    if (len > nBuffered)
+        len = nBuffered;
+
+    if (nFirstLen > len)
+        nFirstLen = len;
+
+    // till end of buffer
+    fast_memcpy(data, m_audioBuf + m_iBufReadPos, nFirstLen);
+    if (len > nFirstLen) { // we have to wrap around
+        // remaining part from beginning of buffer
+        fast_memcpy(data + nFirstLen, m_audioBuf, len - nFirstLen);
+    }
+
+    m_iBufReadPos = (m_iBufReadPos + len) % m_nBufSize;
+
+    return len;
+}
+
+// end ring buffer stuff
+
+static ULONG APIENTRY dart_audio_callback(PVOID pCBData, PVOID pBuffer,
+                                          ULONG ulSize)
+{
+    int nReadLen;
+
+    nReadLen = read_buffer(pBuffer, ulSize);
+    if (nReadLen < ulSize && !m_fQuit) {
+        memset((uint8_t *)pBuffer + nReadLen, DART.bSilence, ulSize - nReadLen);
+        nReadLen = ulSize;
+    }
+
+    return nReadLen;
+}
+
+// to set/get/query special features/parameters
+static int control(int cmd, void *arg)
+{
+    switch (cmd) {
+    case AOCONTROL_GET_VOLUME:
+        {
+        ao_control_vol_t *vol = arg;
+
+        vol->left = vol->right = LOUSHORT(dartGetVolume());
+
+        return CONTROL_OK;
+        }
+
+    case AOCONTROL_SET_VOLUME:
+        {
+        int mid;
+        ao_control_vol_t *vol = arg;
+
+        mid = (vol->left + vol->right) / 2;
+        dartSetVolume(MCI_SET_AUDIO_ALL, mid);
+
+        return CONTROL_OK;
+        }
+    }
+
+    return CONTROL_UNKNOWN;
+}
+
+static void print_help(void)
+{
+    mp_msg(MSGT_AO, MSGL_FATAL,
+           "\n-ao dart commandline help:\n"
+           "Example: mplayer -ao dart:noshare\n"
+           "    open DART in exclusive mode\n"
+           "\nOptions:\n"
+           "    (no)share\n"
+           "        Open DART in shareable or exclusive mode\n"
+           "    bufsize=<size>\n"
+           "        Set buffer size to <size> in samples(default: 2048)\n");
+}
+
+// open & set up audio device
+// return: 1=success 0=fail
+static int init(int rate, int channels, int format, int flags)
+{
+    int fShare = 1;
+    int nDartSamples = DEFAULT_DART_SAMPLES;
+    int nBytesPerSample;
+
+    opt_t subopts[] = {
+        {"share", OPT_ARG_BOOL, &fShare, NULL},
+        {"bufsize", OPT_ARG_INT, &nDartSamples, (opt_test_f)int_non_neg},
+        {NULL}
+    };
+
+    if (subopt_parse(ao_subdevice, subopts) != 0) {
+        print_help();
+        return 0;
+    }
+
+    if (!nDartSamples)
+        nDartSamples = DEFAULT_DART_SAMPLES;
+
+    mp_msg(MSGT_AO, MSGL_V, "DART: opened in %s mode, buffer size = %d sample(s)\n",
+           fShare ? "shareable" : "exclusive", nDartSamples);
+
+    switch (format) {
+    case AF_FORMAT_S16_LE:
+    case AF_FORMAT_S8:
+        break;
+
+    default:
+        format = AF_FORMAT_S16_LE;
+        mp_msg(MSGT_AO, MSGL_V, "DART: format %s not supported defaulting to Signed 16-bit Little-Endian\n",
+               af_fmt2str_short(format));
+        break;
+    }
+
+    nBytesPerSample = (af_fmt2bits(format) >> 3) * channels;
+
+    if (dartInit(0, af_fmt2bits(format), rate, MCI_WAVE_FORMAT_PCM, channels,
+                 2, nBytesPerSample * nDartSamples, fShare,
+                 dart_audio_callback, NULL))
+        return 0;
+
+    mp_msg(MSGT_AO, MSGL_V, "DART: obtained buffer size = %lu bytes\n",
+           DART.ulBufferSize);
+
+    m_fQuit = FALSE;
+
+    ao_data.channels    = channels;
+    ao_data.samplerate  = rate;
+    ao_data.format      = format;
+    ao_data.bps         = nBytesPerSample * rate;
+    ao_data.outburst    = nBytesPerSample * OUTBURST_SAMPLES;
+    ao_data.buffersize  = DART.ulBufferSize;
+
+    // multiple of CHUNK_SIZE
+    m_nBufSize = ((DART.ulBufferSize << 2) / CHUNK_SIZE) * CHUNK_SIZE;
+    // and one more chunk plus round up
+    m_nBufSize += 2 * CHUNK_SIZE;
+
+    m_audioBuf = malloc(m_nBufSize);
+
+    m_iBufReadPos  = 0;
+    m_iBufWritePos = 0;
+
+    dartPlay();
+
+    // might cause PM DLLs to be loaded which incorrectly enable SIG_FPE,
+    // which AAC decoding might trigger.
+    // so, mask off all floating-point exceptions.
+    _control87(MCW_EM, MCW_EM);
+
+    return 1;
+}
+
+// close audio device
+static void uninit(int immed)
+{
+    m_fQuit = TRUE;
+
+    if (!immed) {
+        while (DART.fPlaying)
+            DosSleep(1);
+    }
+
+    dartClose();
+
+    free(m_audioBuf);
+}
+
+// stop playing and empty buffers (for seeking/pause)
+static void reset(void)
+{
+    dartPause();
+
+    // Reset ring-buffer state
+    m_iBufReadPos  = 0;
+    m_iBufWritePos = 0;
+
+    dartResume();
+}
+
+// stop playing, keep buffers (for pause)
+static void audio_pause(void)
+{
+    dartPause();
+}
+
+// resume playing, after audio_pause()
+static void audio_resume(void)
+{
+    dartResume();
+}
+
+// return: how many bytes can be played without blocking
+static int get_space(void)
+{
+    return buf_free();
+}
+
+// plays 'len' bytes of 'data'
+// it should round it down to outburst*n
+// return: number of bytes played
+static int play(void *data, int len, int flags)
+{
+
+    if (!(flags & AOPLAY_FINAL_CHUNK))
+        len = (len / ao_data.outburst) * ao_data.outburst;
+
+    return write_buffer(data, len);
+}
+
+// return: delay in seconds between first and last sample in buffer
+static float get_delay(void)
+{
+    int nBuffered = m_nBufSize - CHUNK_SIZE - buf_free(); // could be less
+
+    return (float)nBuffered / (float)ao_data.bps;
+}