67 lines
3.1 KiB
C
67 lines
3.1 KiB
C
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/*
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Copyright (c) 2012, Broadcom Europe Ltd
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef MMAL_PARAMETERS_AUDIO_H
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#define MMAL_PARAMETERS_AUDIO_H
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#include "mmal_parameters_common.h"
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/*************************************************
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* ALWAYS ADD NEW ENUMS AT THE END OF THIS LIST! *
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************************************************/
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/** Audio-specific MMAL parameter IDs.
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* @ingroup MMAL_PARAMETER_IDS
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*/
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enum
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{
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MMAL_PARAMETER_AUDIO_DESTINATION /**< Takes a MMAL_PARAMETER_STRING_T */
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= MMAL_PARAMETER_GROUP_AUDIO,
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MMAL_PARAMETER_AUDIO_LATENCY_TARGET, /**< Takes a MMAL_PARAMETER_AUDIO_LATENCY_TARGET_T */
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MMAL_PARAMETER_AUDIO_SOURCE,
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MMAL_PARAMETER_AUDIO_PASSTHROUGH, /**< Takes a MMAL_PARAMETER_BOOLEAN_T */
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};
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/** Audio latency target to maintain.
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* These settings are used to adjust the clock speed in order
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* to match the measured audio latency to a specified value. */
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typedef struct MMAL_PARAMETER_AUDIO_LATENCY_TARGET_T
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{
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MMAL_PARAMETER_HEADER_T hdr;
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MMAL_BOOL_T enable; /**< whether this mode is enabled */
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uint32_t filter; /**< number of latency samples to filter on, good value: 1 */
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uint32_t target; /**< target latency (microseconds) */
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uint32_t shift; /**< shift for storing latency values, good value: 7 */
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int32_t speed_factor; /**< multiplier for speed changes, in 24.8 format, good value: 256-512 */
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int32_t inter_factor; /**< divider for comparing latency versus gradiant, good value: 300 */
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int32_t adj_cap; /**< limit for speed change before nSpeedFactor is applied, good value: 100 */
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} MMAL_PARAMETER_AUDIO_LATENCY_TARGET_T;
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#endif /* MMAL_PARAMETERS_AUDIO_H */
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