X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=osx_write.c;h=8e40dd5b24706233c805af788d0269db65627173;hp=b3049c5aadf375abd365e49dafc8a26ff123bd91;hb=e63886e85c55c99e9732e5715b7ce641eff09914;hpb=13036259ef9841f4aedfc9d0765d189292a6f799 diff --git a/osx_write.c b/osx_write.c index b3049c5a..8e40dd5b 100644 --- a/osx_write.c +++ b/osx_write.c @@ -1,19 +1,7 @@ /* - * Copyright (C) 2006 Andre Noll + * Copyright (C) 2006-2007 Andre Noll * - * 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 @@ * */ +#include +#include #include #include "para.h" #include "fd.h" @@ -37,21 +27,34 @@ #include #include #include + +/** describes one input buffer for the osx writer */ struct osx_buffer { + /** pointer to the beginning of the buffer */ float *buffer; + /** the size of this buffer */ long size; - float *ptr; /* Where in the buffer are we? */ + /** current position in the buffer */ + float *ptr; + /** number of floats not yet consuned */ long remaining; + /** pointer to the next audio 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; }; @@ -98,14 +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; } @@ -130,10 +127,7 @@ static OSStatus osx_callback(void * inClientData, 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); + return 0; } // PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m); /* @@ -179,12 +173,11 @@ 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. @@ -214,13 +207,13 @@ 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; @@ -228,14 +221,14 @@ 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)); @@ -255,9 +248,9 @@ 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); } @@ -287,7 +280,7 @@ 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; } @@ -321,6 +314,7 @@ min_delay: return 1; } +/** the init function of the osx writer */ void osx_write_init(struct writer *w) { w->open = osx_write_open;