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[paraslash.git] / osx_write.c

diff --git a/osx_write.c b/osx_write.c
index 4d0bfbdf4f4f9aa300364aa3d53dcee40bb8ba14..057526e30b6900b5dbc747919c43401d0aa42c88 100644 (file)
--- a/osx_write.c
+++ b/osx_write.c
@@ -1,19 +1,7 @@
 /*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
  *
- *     This program 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.
- *
- *     This program 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 this program; if not, write to the Free Software
- *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file osx_write.c paraslash's output plugin for MacOs */
@@ -23,6 +11,8 @@
  * <skortze@sourceforge.net>
  */
 
+#include <sys/types.h>
+#include <dirent.h>
 #include <CoreAudio/CoreAudio.h>
 #include "para.h"
 #include "fd.h"
@@ -44,7 +34,7 @@ struct osx_buffer {
        float *buffer;
        /** the size of this buffer */
        long size;
-       /* current position in the buffer */
+       /** current position in the buffer */
        float *ptr;
        /** number of floats not yet consuned */
        long remaining;
@@ -52,13 +42,19 @@ struct osx_buffer {
        struct osx_buffer *next;
 };
 
+/** data specific to the osx writer */
 struct private_osx_write_data {
-       long size;
-       AudioUnit output;
+       /** the main control structure for audio data manipulation */
+       AudioUnit audio_unit;
+       /** non-zero if playback has started */
        char play;
-       struct osx_buffer *from; /* Current buffers */
+       /** callback reads audio data from this buffer */
+       struct osx_buffer *from;
+       /** the post_select writes audio data here */
        struct osx_buffer *to;
+       /** sample rate of the current audio stream */
        unsigned samplerate;
+       /** number of channels of the current audio stream */
        unsigned channels;
 };
 
@@ -105,14 +101,8 @@ static void fill_buffer(struct osx_buffer *b, short *source, long size)
                b->size = size;
        }
        dest = b->buffer;
-       while (size--) {
-               char *tmp = (char *)source;
-               char c = *tmp;
-               *tmp = *(tmp + 1);
-               *(tmp + 1) = c;
-               /* *dest++ = ((*source++) + 32768) / 65536.0; */
+       while (size--)
                *dest++ = (*source++) / 32768.0;
-       }
        b->ptr = b->buffer;
        b->remaining = b->size;
 }
@@ -136,11 +126,8 @@ static OSStatus osx_callback(void * inClientData,
                dest = outOutputData->mBuffers[i].mData;
                while (m > 0) {
                        if ((n = powd->from->remaining) <= 0) {
-                               PARA_INFO_LOG("%s", "buffer underrun\n");
-                               /* no more bytes in the current read buffer! */
-                               while ((n = powd->from->remaining) <= 0)
-                                       /* wait for the results */
-                                       usleep(2000);
+                               PARA_INFO_LOG("buffer underrun\n");
+                               return 0;
                        }
 //                     PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
                        /*
@@ -161,6 +148,12 @@ static OSStatus osx_callback(void * inClientData,
        return 0;
 }
 
+#ifdef WORDS_BIGENDIAN /* ppc */
+#define ENDIAN_FLAGS kLinearPCMFormatFlagIsBigEndian
+#else
+#define ENDIAN_FLAGS 0
+#endif
+
 static int osx_write_open(struct writer_node *wn)
 {
        struct private_osx_write_data *powd = para_calloc(
@@ -186,12 +179,11 @@ static int osx_write_open(struct writer_node *wn)
        if (!comp)
                goto e0;
        ret = -E_OPEN_COMP;
-       if (OpenAComponent(comp, &powd->output))
+       if (OpenAComponent(comp, &powd->audio_unit))
                goto e0;
        ret = -E_UNIT_INIT;
-       if (AudioUnitInitialize(powd->output))
+       if (AudioUnitInitialize(powd->audio_unit))
                goto e1;
-       powd->size = 0;
        powd->play = 0;
        /* Hmmm, let's choose PCM format */
        /* We tell the Output Unit what format we're going to supply data to it.
@@ -209,7 +201,7 @@ static int osx_write_open(struct writer_node *wn)
        /* flags specific to each format */
        format.mFormatFlags = kLinearPCMFormatFlagIsFloat
                | kLinearPCMFormatFlagIsPacked
-               | kLinearPCMFormatFlagIsBigEndian;
+               | ENDIAN_FLAGS;
        if (!conf->channels_given && wng->channels)
                powd->channels = *wng->channels;
        else
@@ -221,13 +213,13 @@ static int osx_write_open(struct writer_node *wn)
        /* one of the most constant constants of the whole computer history */
        format.mBitsPerChannel = sizeof(float) * 8;
        ret = -E_STREAM_FORMAT;
-       if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
+       if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_StreamFormat,
                        kAudioUnitScope_Input, 0, &format,
                        sizeof(AudioStreamBasicDescription)))
                goto e2;
        init_buffers(wn);
        ret = -E_ADD_CALLBACK;
-       if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
+       if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_SetRenderCallback,
                        kAudioUnitScope_Input, 0, &inputCallback,
                        sizeof(inputCallback)) < 0)
                goto e3;
@@ -235,14 +227,14 @@ static int osx_write_open(struct writer_node *wn)
 e3:
        destroy_buffers(powd);
 e2:
-       AudioUnitUninitialize(powd->output);
+       AudioUnitUninitialize(powd->audio_unit);
 e1:
-       CloseComponent(powd->output);
+       CloseComponent(powd->audio_unit);
 e0:
        return ret;
 }
 
-__malloc void *osx_write_parse_config(char *options)
+__malloc static void *osx_write_parse_config(const char *options)
 {
        struct osx_write_args_info *conf
                = para_calloc(sizeof(struct osx_write_args_info));
@@ -262,9 +254,9 @@ static void osx_write_close(struct writer_node *wn)
        struct private_osx_write_data *powd = wn->private_data;
 
        PARA_INFO_LOG("closing writer node %p\n", wn);
-       AudioOutputUnitStop(powd->output);
-       AudioUnitUninitialize(powd->output);
-       CloseComponent(powd->output);
+       AudioOutputUnitStop(powd->audio_unit);
+       AudioUnitUninitialize(powd->audio_unit);
+       CloseComponent(powd->audio_unit);
        destroy_buffers(powd);
        free(powd);
 }
@@ -294,7 +286,7 @@ static int osx_write_post_select(__a_unused struct sched *s,
        powd->to = powd->to->next;
        wn->written = *wng->loaded;
        if (!powd->play) {
-               if (AudioOutputUnitStart(powd->output))
+               if (AudioOutputUnitStart(powd->audio_unit))
                        return -E_UNIT_START;
                powd->play = 1;
        }
@@ -328,6 +320,7 @@ min_delay:
        return 1;
 }
 
+/** the init function of the osx writer */
 void osx_write_init(struct writer *w)
 {
        w->open = osx_write_open;