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Diffstat (limited to 'src/filter/ConvertFilterPlugin.cxx')
-rw-r--r-- | src/filter/ConvertFilterPlugin.cxx | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/src/filter/ConvertFilterPlugin.cxx b/src/filter/ConvertFilterPlugin.cxx new file mode 100644 index 000000000..04f34842d --- /dev/null +++ b/src/filter/ConvertFilterPlugin.cxx @@ -0,0 +1,148 @@ +/* + * 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 "ConvertFilterPlugin.hxx" +#include "filter_plugin.h" +#include "filter_internal.h" +#include "filter_registry.h" +#include "conf.h" +#include "pcm_convert.h" +#include "audio_format.h" +#include "poison.h" + +#include <assert.h> +#include <string.h> + +struct ConvertFilter { + struct filter base; + + /** + * The current convert, from 0 to #PCM_CONVERT_1. + */ + unsigned convert; + + /** + * The input audio format; PCM data is passed to the filter() + * method in this format. + */ + struct audio_format in_audio_format; + + /** + * The output audio format; the consumer of this plugin + * expects PCM data in this format. This defaults to + * #in_audio_format, and can be set with convert_filter_set(). + */ + struct audio_format out_audio_format; + + struct pcm_convert_state state; + + ConvertFilter() { + filter_init(&base, &convert_filter_plugin); + } +}; + +static struct filter * +convert_filter_init(gcc_unused const struct config_param *param, + gcc_unused GError **error_r) +{ + ConvertFilter *filter = new ConvertFilter(); + return &filter->base; +} + +static void +convert_filter_finish(struct filter *filter) +{ + delete filter; +} + +static const struct audio_format * +convert_filter_open(struct filter *_filter, struct audio_format *audio_format, + gcc_unused GError **error_r) +{ + ConvertFilter *filter = (ConvertFilter *)_filter; + + assert(audio_format_valid(audio_format)); + + filter->in_audio_format = filter->out_audio_format = *audio_format; + pcm_convert_init(&filter->state); + + return &filter->in_audio_format; +} + +static void +convert_filter_close(struct filter *_filter) +{ + ConvertFilter *filter = (ConvertFilter *)_filter; + + pcm_convert_deinit(&filter->state); + + poison_undefined(&filter->in_audio_format, + sizeof(filter->in_audio_format)); + poison_undefined(&filter->out_audio_format, + sizeof(filter->out_audio_format)); +} + +static const void * +convert_filter_filter(struct filter *_filter, const void *src, size_t src_size, + size_t *dest_size_r, GError **error_r) +{ + ConvertFilter *filter = (ConvertFilter *)_filter; + const void *dest; + + if (audio_format_equals(&filter->in_audio_format, + &filter->out_audio_format)) { + /* optimized special case: no-op */ + *dest_size_r = src_size; + return src; + } + + dest = pcm_convert(&filter->state, &filter->in_audio_format, + src, src_size, + &filter->out_audio_format, dest_size_r, + error_r); + if (dest == NULL) + return NULL; + + return dest; +} + +const struct filter_plugin convert_filter_plugin = { + "convert", + convert_filter_init, + convert_filter_finish, + convert_filter_open, + convert_filter_close, + convert_filter_filter, +}; + +void +convert_filter_set(struct filter *_filter, + const struct audio_format *out_audio_format) +{ + ConvertFilter *filter = (ConvertFilter *)_filter; + + assert(filter != NULL); + assert(audio_format_valid(&filter->in_audio_format)); + assert(audio_format_valid(&filter->out_audio_format)); + assert(out_audio_format != NULL); + assert(audio_format_valid(out_audio_format)); + + filter->out_audio_format = *out_audio_format; +} |