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Diffstat (limited to '')
| -rw-r--r-- | src/filter/ChainFilterPlugin.cxx | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/src/filter/ChainFilterPlugin.cxx b/src/filter/ChainFilterPlugin.cxx deleted file mode 100644 index cb52b86ca..000000000 --- a/src/filter/ChainFilterPlugin.cxx +++ /dev/null @@ -1,181 +0,0 @@ -/* - * Copyright (C) 2003-2013 The Music Player Daemon Project - * http://www.musicpd.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., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include "config.h" -#include "ChainFilterPlugin.hxx" -#include "FilterPlugin.hxx" -#include "FilterInternal.hxx" -#include "FilterRegistry.hxx" -#include "AudioFormat.hxx" -#include "util/Error.hxx" -#include "util/Domain.hxx" - -#include <list> - -#include <assert.h> - -class ChainFilter final : public Filter { - struct Child { - const char *name; - Filter *filter; - - Child(const char *_name, Filter *_filter) - :name(_name), filter(_filter) {} - ~Child() { - delete filter; - } - - Child(const Child &) = delete; - Child &operator=(const Child &) = delete; - }; - - std::list<Child> children; - -public: - void Append(const char *name, Filter *filter) { - children.emplace_back(name, filter); - } - - virtual AudioFormat Open(AudioFormat &af, Error &error) override; - virtual void Close(); - virtual const void *FilterPCM(const void *src, size_t src_size, - size_t *dest_size_r, Error &error); - -private: - /** - * Close all filters in the chain until #until is reached. - * #until itself is not closed. - */ - void CloseUntil(const Filter *until); -}; - -static constexpr Domain chain_filter_domain("chain_filter"); - -static Filter * -chain_filter_init(gcc_unused const config_param ¶m, - gcc_unused Error &error) -{ - return new ChainFilter(); -} - -void -ChainFilter::CloseUntil(const Filter *until) -{ - for (auto &child : children) { - if (child.filter == until) - /* don't close this filter */ - return; - - /* close this filter */ - child.filter->Close(); - } - - /* this assertion fails if #until does not exist (anymore) */ - assert(false); - gcc_unreachable(); -} - -static AudioFormat -chain_open_child(const char *name, Filter *filter, - const AudioFormat &prev_audio_format, - Error &error) -{ - AudioFormat conv_audio_format = prev_audio_format; - const AudioFormat next_audio_format = - filter->Open(conv_audio_format, error); - if (!next_audio_format.IsDefined()) - return next_audio_format; - - if (conv_audio_format != prev_audio_format) { - struct audio_format_string s; - - filter->Close(); - - error.Format(chain_filter_domain, - "Audio format not supported by filter '%s': %s", - name, - audio_format_to_string(prev_audio_format, &s)); - return AudioFormat::Undefined(); - } - - return next_audio_format; -} - -AudioFormat -ChainFilter::Open(AudioFormat &in_audio_format, Error &error) -{ - AudioFormat audio_format = in_audio_format; - - for (auto &child : children) { - audio_format = chain_open_child(child.name, child.filter, - audio_format, error); - if (!audio_format.IsDefined()) { - /* rollback, close all children */ - CloseUntil(child.filter); - break; - } - } - - /* return the output format of the last filter */ - return audio_format; -} - -void -ChainFilter::Close() -{ - for (auto &child : children) - child.filter->Close(); -} - -const void * -ChainFilter::FilterPCM(const void *src, size_t src_size, - size_t *dest_size_r, Error &error) -{ - for (auto &child : children) { - /* feed the output of the previous filter as input - into the current one */ - src = child.filter->FilterPCM(src, src_size, &src_size, - error); - if (src == nullptr) - return nullptr; - } - - /* return the output of the last filter */ - *dest_size_r = src_size; - return src; -} - -const struct filter_plugin chain_filter_plugin = { - "chain", - chain_filter_init, -}; - -Filter * -filter_chain_new(void) -{ - return new ChainFilter(); -} - -void -filter_chain_append(Filter &_chain, const char *name, Filter *filter) -{ - ChainFilter &chain = (ChainFilter &)_chain; - - chain.Append(name, filter); -} |