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https://github.com/alsa-project/alsa-utils
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90f5967178
Remove the call to snd_config_expand_custom() to expand the top-level input config. And replace it with calls to snd_config_evaluate_string() for each non-compound config while processing individual objects. This will allow retreving variable definitions from object attribute values and global definitions. Add a new field "current_obj_cfg" to hold the current object config being pre-processed. This will facilitate adding simple math expressions for computing attribute values for objects based on other attributes. For ex: we can set the expression for buffer size as follows: buffer_size "$[($in_channels * 48) * 4]" The buffer_size attribute value will be computed with the attribute value "in_channels" based on the expression above. So if $in_channels = 2, buffer_size will be evaluated to 384. Additionally this change also permits computing attribute values based on previously computed values. For example: buffer_size "$[($in_channels * 48) * 4]" dma_buffer_size "$[$buffer_size * 2]" dma_buffer_size will be computed as 768. Note that the order of definitions for buffer_size and dma_buffer_size matters because the evaluation for dma_buffer_size depends on the evaluation of buffer_size. In order to conform to this, the tplg_object_copy_and_add_param() is modified to add attribute configs from class config to an object using snd_config_before() instead of snd_config_add(). With this change, we no longer need to set the auto_attr_updater for buffer type widget objects. So remove it. Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __TOPOLOGY_H
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#define __TOPOLOGY_H
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#include <stdlib.h>
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/* pre_processor */
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struct tplg_pre_processor {
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snd_config_t *input_cfg;
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snd_config_t *output_cfg;
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snd_output_t *output;
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snd_output_t *dbg_output;
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snd_config_t *current_obj_cfg;
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};
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int pre_process(struct tplg_pre_processor *tplg_pp, char *config, size_t config_size,
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const char *pre_processor_defs, const char *inc_path);
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int init_pre_processor(struct tplg_pre_processor **tplg_pp, snd_output_type_t type,
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const char *output_file);
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void free_pre_preprocessor(struct tplg_pre_processor *tplg_pp);
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#endif
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