diff options
Diffstat (limited to 'src/filter')
| -rw-r--r-- | src/filter/autoconvert_filter_plugin.c | 169 | ||||
| -rw-r--r-- | src/filter/autoconvert_filter_plugin.h | 34 |
2 files changed, 203 insertions, 0 deletions
diff --git a/src/filter/autoconvert_filter_plugin.c b/src/filter/autoconvert_filter_plugin.c new file mode 100644 index 000000000..c862ffe23 --- /dev/null +++ b/src/filter/autoconvert_filter_plugin.c @@ -0,0 +1,169 @@ +/* + * Copyright (C) 2003-2009 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 "filter/autoconvert_filter_plugin.h" +#include "filter/convert_filter_plugin.h" +#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 autoconvert_filter { + struct filter base; + + /** + * The audio format being fed to the underlying filter. This + * plugin actually doesn't need this variable, we have it here + * just so our open() method doesn't return a stack pointer. + */ + struct audio_format in_audio_format; + + /** + * The underlying filter. + */ + struct filter *filter; + + /** + * A convert_filter, just in case conversion is needed. NULL + * if unused. + */ + struct filter *convert; +}; + +static void +autoconvert_filter_finish(struct filter *_filter) +{ + struct autoconvert_filter *filter = + (struct autoconvert_filter *)_filter; + + filter_free(filter->filter); + g_free(filter); +} + +static const struct audio_format * +autoconvert_filter_open(struct filter *_filter, + struct audio_format *in_audio_format, + GError **error_r) +{ + struct autoconvert_filter *filter = + (struct autoconvert_filter *)_filter; + const struct audio_format *out_audio_format; + + assert(audio_format_valid(in_audio_format)); + + /* open the "real" filter */ + + filter->in_audio_format = *in_audio_format; + + out_audio_format = filter_open(filter->filter, + &filter->in_audio_format, error_r); + if (out_audio_format == NULL) + return NULL; + + /* need to convert? */ + + if (!audio_format_equals(&filter->in_audio_format, in_audio_format)) { + /* yes - create a convert_filter */ + struct audio_format audio_format2 = *in_audio_format; + const struct audio_format *audio_format3; + + filter->convert = filter_new(&convert_filter_plugin, NULL, + error_r); + if (filter->convert == NULL) { + filter_close(filter->filter); + return NULL; + } + + audio_format3 = filter_open(filter->convert, &audio_format2, + error_r); + if (audio_format3 == NULL) { + filter_free(filter->convert); + filter_close(filter->filter); + return NULL; + } + + assert(audio_format_equals(&audio_format2, in_audio_format)); + + convert_filter_set(filter->convert, &filter->in_audio_format); + } else + /* no */ + filter->convert = NULL; + + return out_audio_format; +} + +static void +autoconvert_filter_close(struct filter *_filter) +{ + struct autoconvert_filter *filter = + (struct autoconvert_filter *)_filter; + + if (filter->convert != NULL) { + filter_close(filter->convert); + filter_free(filter->convert); + } + + filter_close(filter->filter); +} + +static const void * +autoconvert_filter_filter(struct filter *_filter, const void *src, + size_t src_size, size_t *dest_size_r, + GError **error_r) +{ + struct autoconvert_filter *filter = + (struct autoconvert_filter *)_filter; + + if (filter->convert != NULL) { + src = filter_filter(filter->convert, src, src_size, &src_size, + error_r); + if (src == NULL) + return NULL; + } + + return filter_filter(filter->filter, src, src_size, dest_size_r, + error_r); +} + +static const struct filter_plugin autoconvert_filter_plugin = { + .name = "convert", + .finish = autoconvert_filter_finish, + .open = autoconvert_filter_open, + .close = autoconvert_filter_close, + .filter = autoconvert_filter_filter, +}; + +struct filter * +autoconvert_filter_new(struct filter *_filter) +{ + struct autoconvert_filter *filter = + g_new(struct autoconvert_filter, 1); + + filter_init(&filter->base, &autoconvert_filter_plugin); + filter->filter = _filter; + + return &filter->base; +} diff --git a/src/filter/autoconvert_filter_plugin.h b/src/filter/autoconvert_filter_plugin.h new file mode 100644 index 000000000..cb98d6af2 --- /dev/null +++ b/src/filter/autoconvert_filter_plugin.h @@ -0,0 +1,34 @@ +/* + * Copyright (C) 2003-2009 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. + */ + +#ifndef AUTOCONVERT_FILTER_PLUGIN_H +#define AUTOCONVERT_FILTER_PLUGIN_H + +struct filter; + +/** + * Creates a new "autoconvert" filter. When opened, it ensures that + * the input audio format isn't changed. If the underlying filter + * requests a different format, it automatically creates a + * convert_filter. + */ +struct filter * +autoconvert_filter_new(struct filter *filter); + +#endif |