--- /dev/null
+/*
+ * Copyright (C) 2006 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.
+ */
+
+/** \file osx_write.c paraslash's output plugin for MacOs */
+
+/*
+ * based on mosx-mpg123, by Guillaume Outters and Steven A. Kortze
+ * <skortze@sourceforge.net>
+ */
+
+#include <CoreAudio/CoreAudio.h>
+#include "para.h"
+#include "fd.h"
+#include "string.h"
+#include "list.h"
+#include "sched.h"
+#include "write.h"
+#include "osx_write.cmdline.h"
+#include "error.h"
+
+
+#include <CoreAudio/CoreAudio.h>
+#include <AudioUnit/AudioUnit.h>
+#include <AudioToolbox/DefaultAudioOutput.h>
+struct osx_buffer {
+ float *buffer;
+ long size;
+ float *ptr; /* Where in the buffer are we? */
+ long remaining;
+ struct osx_buffer *next;
+};
+typedef struct osx_buffer osx_buffer;
+
+struct private_osx_write_data {
+ long size;
+ short *ptr;
+ AudioUnit output;
+ char play;
+ osx_buffer *from; /* Current buffers */
+ osx_buffer *to;
+ unsigned samplerate;
+ unsigned channels;
+};
+
+
+/*
+ * Tried with 3 buffers, but then any little window move is sufficient to
+ * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
+ * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
+ * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
+ * buffers don't work much further than the Bus error.
+ */
+#define NUMBER_BUFFERS 2
+
+static void destroy_buffers(struct private_osx_write_data *powd)
+{
+ osx_buffer *ptr;
+ osx_buffer *ptr2;
+ ptr = powd->to->next;
+ powd->to->next = NULL;
+ while (ptr) {
+ ptr2 = ptr->next;
+ free(ptr->buffer);
+ free(ptr);
+ ptr = ptr2;
+ }
+}
+
+static void init_buffers(struct private_osx_write_data *powd)
+{
+ int i;
+
+ osx_buffer ** ptrptr;
+ ptrptr = &powd->to;
+ for (i = 0; i < NUMBER_BUFFERS; i++) {
+ *ptrptr = malloc(sizeof(osx_buffer));
+ (*ptrptr)->size = 0;
+ (*ptrptr)->remaining = 0;
+ (*ptrptr)->buffer = NULL;
+ ptrptr = &(*ptrptr)->next;
+ /* This buffer is ready for filling (of course, it is empty!) */
+ }
+ *ptrptr = powd->from = powd->to;
+}
+
+static void fill_buffer(osx_buffer *b, short *source, long size)
+{
+ float *dest;
+
+ if (b->remaining) /* Non empty buffer, must still be playing */
+ return;
+ PARA_INFO_LOG("%ld\n", size);
+ if (b->size != size) {
+ /*
+ * Hey! What's that? Coudn't this buffer size be fixed
+ * once (well, perhaps we just didn't allocate it yet)
+ */
+ if (b->buffer)
+ free(b->buffer);
+ b->buffer = malloc(size * sizeof(float));
+ 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; */
+ *dest++ = (*source++) / 32768.0;
+ }
+ b->ptr = b->buffer;
+ b->remaining = b->size;
+}
+
+static OSStatus osx_callback(void * inClientData,
+ __a_unused AudioUnitRenderActionFlags *inActionFlags,
+ __a_unused const AudioTimeStamp *inTimeStamp,
+ __a_unused UInt32 inBusNumber,
+ __a_unused UInt32 inNumFrames,
+ AudioBufferList *outOutputData)
+{
+ long m, n;
+ float *dest;
+ int i;
+ struct private_osx_write_data *powd = inClientData;
+
+// PARA_INFO_LOG("%p\n", powd);
+ for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
+ /* what we have to fill */
+ m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
+ 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("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
+ /*
+ * we dump what we can. In fact, just the necessary
+ * should be sufficient
+ */
+ if (n > m)
+ n = m;
+ memcpy(dest, powd->from->ptr, n * sizeof(float));
+ dest += n;
+ /* remember all done work */
+ m -= n;
+ powd->from->ptr += n;
+ if ((powd->from->remaining -= n) <= 0)
+ powd->from = powd->from->next;
+ }
+ }
+ return 0;
+}
+
+static int osx_write_open(struct writer_node *wn)
+{
+ struct private_osx_write_data *powd = para_calloc(
+ sizeof(struct private_osx_write_data));
+ ComponentDescription desc;
+ Component comp;
+ AURenderCallbackStruct inputCallback = {osx_callback, powd};
+ AudioStreamBasicDescription format;
+ int ret;
+ struct writer_node_group *wng = wn->wng;
+ struct osx_write_args_info *conf = wn->conf;
+
+ wn->private_data = powd;
+ /* where did that default audio output go? */
+ desc.componentType = kAudioUnitType_Output;
+ desc.componentSubType = kAudioUnitSubType_DefaultOutput;
+ /* NOTE: and if default output isn't Apple? */
+ desc.componentManufacturer = kAudioUnitManufacturer_Apple;
+ desc.componentFlags = 0;
+ desc.componentFlagsMask = 0;
+ ret = -E_DEFAULT_COMP;
+ comp = FindNextComponent(NULL, &desc);
+ if (!comp)
+ goto e0;
+ ret = -E_OPEN_COMP;
+ if (OpenAComponent(comp, &powd->output))
+ goto e0;
+ ret = -E_UNIT_INIT;
+ if (AudioUnitInitialize(powd->output))
+ goto e1;
+ powd->size = 0;
+ powd->ptr = NULL;
+ powd->play = 0;
+ /* Hmmm, let's choose PCM format */
+ /* We tell the Output Unit what format we're going to supply data to it.
+ * This is necessary if you're providing data through an input callback
+ * AND you want the DefaultOutputUnit to do any format conversions
+ * necessary from your format to the device's format.
+ */
+ if (!conf->samplerate_given && wng->samplerate)
+ powd->samplerate = *wng->samplerate;
+ else
+ powd->samplerate = conf->samplerate_arg;
+ format.mSampleRate = powd->samplerate;
+ /* The specific encoding type of audio stream*/
+ format.mFormatID = kAudioFormatLinearPCM;
+ /* flags specific to each format */
+ format.mFormatFlags = kLinearPCMFormatFlagIsFloat
+ | kLinearPCMFormatFlagIsPacked
+ | kLinearPCMFormatFlagIsBigEndian;
+ if (!conf->channels_given && wng->channels)
+ powd->channels = *wng->channels;
+ else
+ powd->channels = conf->channels_arg;
+ format.mChannelsPerFrame = powd->channels;
+ format.mFramesPerPacket = 1;
+ format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
+ format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
+ /* 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,
+ kAudioUnitScope_Input, 0, &format,
+ sizeof(AudioStreamBasicDescription)))
+ goto e2;
+ init_buffers(powd);
+ ret = -E_ADD_CALLBACK;
+ if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
+ kAudioUnitScope_Input, 0, &inputCallback,
+ sizeof(inputCallback)) < 0)
+ goto e3;
+ return 1;
+e3:
+ destroy_buffers(powd);
+e2:
+ AudioUnitUninitialize(powd->output);
+e1:
+ CloseComponent(powd->output);
+e0:
+ return ret;
+}
+
+__malloc void *osx_write_parse_config(char *options)
+{
+ struct osx_write_args_info *conf
+ = para_calloc(sizeof(struct osx_write_args_info));
+ PARA_INFO_LOG("options: %s\n", options);
+ int ret = osx_cmdline_parser_string(options, conf, "osx_write");
+ if (ret)
+ goto err_out;
+ return conf;
+err_out:
+ free(conf);
+ return NULL;
+
+}
+
+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);
+ destroy_buffers(powd);
+ free(powd);
+}
+
+static int need_new_buffer(struct writer_node *wn)
+{
+ struct writer_node_group *wng = wn->wng;
+ struct private_osx_write_data *powd = wn->private_data;
+
+ if (*wng->loaded < sizeof(short))
+ return 0;
+ if (powd->to->remaining) /* Non empty buffer, must still be playing */
+ return 0;
+ return 1;
+}
+
+static int osx_write_post_select(__a_unused struct sched *s,
+ struct writer_node *wn)
+{
+ struct private_osx_write_data *powd = wn->private_data;
+ struct writer_node_group *wng = wn->wng;
+ short *data = (short*)wng->buf;
+
+ if (!need_new_buffer(wn))
+ return 1;
+ fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
+ powd->to = powd->to->next;
+ wn->written = *wng->loaded;
+ if (!powd->play) {
+ if (AudioOutputUnitStart(powd->output))
+ return -E_UNIT_START;
+ powd->play = 1;
+ }
+ return 1;
+}
+
+static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
+{
+ s->timeout.tv_sec = 0;
+ s->timeout.tv_usec = 20;
+ return 1;
+}
+
+void osx_write_init(struct writer *w)
+{
+ w->open = osx_write_open;
+ w->close = osx_write_close;
+ w->pre_select = osx_write_pre_select;
+ w->post_select = osx_write_post_select;
+ w->parse_config = osx_write_parse_config;
+ w->shutdown = NULL; /* nothing to do */
+}
projects / paraslash.git / blobdiff