filter: added the "autoconvert" filter plugin
This commit is contained in:
Max Kellermann
parent
b54bde6f2b
commit
6a17233f78
@ -50,6 +50,7 @@ mpd_headers = \
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src/filter_config.h \
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src/filter_plugin.h \
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src/filter_registry.h \
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src/filter/autoconvert_filter_plugin.h \
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src/filter/chain_filter_plugin.h \
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src/filter/convert_filter_plugin.h \
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src/filter/volume_filter_plugin.h \
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@ -720,6 +721,7 @@ endif
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FILTER_SRC = \
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src/filter/null_filter_plugin.c \
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src/filter/chain_filter_plugin.c \
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src/filter/autoconvert_filter_plugin.c \
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src/filter/convert_filter_plugin.c \
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src/filter/route_filter_plugin.c \
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src/filter/normalize_filter_plugin.c \
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169
src/filter/autoconvert_filter_plugin.c
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169
src/filter/autoconvert_filter_plugin.c
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@ -0,0 +1,169 @@
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/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "filter/autoconvert_filter_plugin.h"
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#include "filter/convert_filter_plugin.h"
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#include "filter_plugin.h"
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#include "filter_internal.h"
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#include "filter_registry.h"
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#include "conf.h"
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#include "pcm_convert.h"
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#include "audio_format.h"
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#include "poison.h"
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#include <assert.h>
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#include <string.h>
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struct autoconvert_filter {
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struct filter base;
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/**
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* The audio format being fed to the underlying filter. This
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* plugin actually doesn't need this variable, we have it here
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* just so our open() method doesn't return a stack pointer.
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*/
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struct audio_format in_audio_format;
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/**
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* The underlying filter.
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*/
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struct filter *filter;
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/**
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* A convert_filter, just in case conversion is needed. NULL
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* if unused.
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*/
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struct filter *convert;
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};
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static void
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autoconvert_filter_finish(struct filter *_filter)
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{
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struct autoconvert_filter *filter =
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(struct autoconvert_filter *)_filter;
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filter_free(filter->filter);
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g_free(filter);
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}
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static const struct audio_format *
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autoconvert_filter_open(struct filter *_filter,
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struct audio_format *in_audio_format,
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GError **error_r)
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{
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struct autoconvert_filter *filter =
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(struct autoconvert_filter *)_filter;
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const struct audio_format *out_audio_format;
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assert(audio_format_valid(in_audio_format));
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/* open the "real" filter */
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filter->in_audio_format = *in_audio_format;
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out_audio_format = filter_open(filter->filter,
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&filter->in_audio_format, error_r);
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if (out_audio_format == NULL)
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return NULL;
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/* need to convert? */
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if (!audio_format_equals(&filter->in_audio_format, in_audio_format)) {
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/* yes - create a convert_filter */
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struct audio_format audio_format2 = *in_audio_format;
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const struct audio_format *audio_format3;
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filter->convert = filter_new(&convert_filter_plugin, NULL,
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error_r);
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if (filter->convert == NULL) {
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filter_close(filter->filter);
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return NULL;
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}
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audio_format3 = filter_open(filter->convert, &audio_format2,
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error_r);
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if (audio_format3 == NULL) {
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filter_free(filter->convert);
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filter_close(filter->filter);
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return NULL;
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}
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assert(audio_format_equals(&audio_format2, in_audio_format));
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convert_filter_set(filter->convert, &filter->in_audio_format);
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} else
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/* no */
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filter->convert = NULL;
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return out_audio_format;
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}
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static void
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autoconvert_filter_close(struct filter *_filter)
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{
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struct autoconvert_filter *filter =
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(struct autoconvert_filter *)_filter;
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if (filter->convert != NULL) {
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filter_close(filter->convert);
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filter_free(filter->convert);
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}
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filter_close(filter->filter);
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}
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static const void *
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autoconvert_filter_filter(struct filter *_filter, const void *src,
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size_t src_size, size_t *dest_size_r,
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GError **error_r)
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{
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struct autoconvert_filter *filter =
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(struct autoconvert_filter *)_filter;
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if (filter->convert != NULL) {
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src = filter_filter(filter->convert, src, src_size, &src_size,
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error_r);
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if (src == NULL)
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return NULL;
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}
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return filter_filter(filter->filter, src, src_size, dest_size_r,
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error_r);
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}
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static const struct filter_plugin autoconvert_filter_plugin = {
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.name = "convert",
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.finish = autoconvert_filter_finish,
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.open = autoconvert_filter_open,
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.close = autoconvert_filter_close,
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.filter = autoconvert_filter_filter,
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};
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struct filter *
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autoconvert_filter_new(struct filter *_filter)
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{
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struct autoconvert_filter *filter =
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g_new(struct autoconvert_filter, 1);
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filter_init(&filter->base, &autoconvert_filter_plugin);
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filter->filter = _filter;
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return &filter->base;
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}
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34
src/filter/autoconvert_filter_plugin.h
Normal file
34
src/filter/autoconvert_filter_plugin.h
Normal file
@ -0,0 +1,34 @@
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/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef AUTOCONVERT_FILTER_PLUGIN_H
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#define AUTOCONVERT_FILTER_PLUGIN_H
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struct filter;
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/**
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* Creates a new "autoconvert" filter. When opened, it ensures that
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* the input audio format isn't changed. If the underlying filter
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* requests a different format, it automatically creates a
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* convert_filter.
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*/
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struct filter *
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autoconvert_filter_new(struct filter *filter);
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#endif
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