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https://github.com/alsa-project/alsa-lib.git
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e0d52fdd8a
Signed-off-by: Thomas Klausner <wiz@NetBSD.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
302 lines
8.5 KiB
C
302 lines
8.5 KiB
C
/**
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* \file pcm/pcm_copy.c
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* \ingroup PCM_Plugins
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* \brief PCM Copy Plugin Interface
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* \author Abramo Bagnara <abramo@alsa-project.org>
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* \date 2000-2001
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*/
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/*
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* PCM - Copy conversion
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* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program 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
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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*/
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#include "bswap.h"
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#include "pcm_local.h"
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#include "pcm_plugin.h"
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#ifndef PIC
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/* entry for static linking */
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const char *_snd_module_pcm_copy = "";
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#endif
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#ifndef DOC_HIDDEN
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typedef struct {
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/* This field need to be the first */
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snd_pcm_plugin_t plug;
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} snd_pcm_copy_t;
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#endif
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static int snd_pcm_copy_hw_refine_cprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params)
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{
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int err;
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snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM };
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err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_ACCESS,
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&access_mask);
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if (err < 0)
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return err;
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params->info &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
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return 0;
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}
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static int snd_pcm_copy_hw_refine_sprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *sparams)
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{
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snd_pcm_access_mask_t saccess_mask = { SND_PCM_ACCBIT_MMAP };
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_snd_pcm_hw_params_any(sparams);
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_snd_pcm_hw_param_set_mask(sparams, SND_PCM_HW_PARAM_ACCESS,
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&saccess_mask);
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return 0;
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}
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static int snd_pcm_copy_hw_refine_schange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
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snd_pcm_hw_params_t *sparams)
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{
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int err;
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unsigned int links = ~SND_PCM_HW_PARBIT_ACCESS;
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err = _snd_pcm_hw_params_refine(sparams, links, params);
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if (err < 0)
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return err;
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return 0;
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}
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static int snd_pcm_copy_hw_refine_cchange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
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snd_pcm_hw_params_t *sparams)
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{
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int err;
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unsigned int links = ~SND_PCM_HW_PARBIT_ACCESS;
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err = _snd_pcm_hw_params_refine(params, links, sparams);
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if (err < 0)
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return err;
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return 0;
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}
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static int snd_pcm_copy_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
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{
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return snd_pcm_hw_refine_slave(pcm, params,
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snd_pcm_copy_hw_refine_cprepare,
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snd_pcm_copy_hw_refine_cchange,
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snd_pcm_copy_hw_refine_sprepare,
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snd_pcm_copy_hw_refine_schange,
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snd_pcm_generic_hw_refine);
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}
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static int snd_pcm_copy_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
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{
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return snd_pcm_hw_params_slave(pcm, params,
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snd_pcm_copy_hw_refine_cchange,
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snd_pcm_copy_hw_refine_sprepare,
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snd_pcm_copy_hw_refine_schange,
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snd_pcm_generic_hw_params);
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}
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static snd_pcm_uframes_t
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snd_pcm_copy_write_areas(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *areas,
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snd_pcm_uframes_t offset,
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snd_pcm_uframes_t size,
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const snd_pcm_channel_area_t *slave_areas,
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snd_pcm_uframes_t slave_offset,
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snd_pcm_uframes_t *slave_sizep)
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{
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if (size > *slave_sizep)
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size = *slave_sizep;
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snd_pcm_areas_copy(slave_areas, slave_offset,
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areas, offset,
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pcm->channels, size, pcm->format);
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*slave_sizep = size;
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return size;
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}
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static snd_pcm_uframes_t
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snd_pcm_copy_read_areas(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *areas,
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snd_pcm_uframes_t offset,
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snd_pcm_uframes_t size,
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const snd_pcm_channel_area_t *slave_areas,
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snd_pcm_uframes_t slave_offset,
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snd_pcm_uframes_t *slave_sizep)
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{
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if (size > *slave_sizep)
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size = *slave_sizep;
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snd_pcm_areas_copy(areas, offset,
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slave_areas, slave_offset,
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pcm->channels, size, pcm->format);
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*slave_sizep = size;
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return size;
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}
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static void snd_pcm_copy_dump(snd_pcm_t *pcm, snd_output_t *out)
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{
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snd_pcm_copy_t *copy = pcm->private_data;
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snd_output_printf(out, "Copy conversion PCM\n");
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if (pcm->setup) {
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snd_output_printf(out, "Its setup is:\n");
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snd_pcm_dump_setup(pcm, out);
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}
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snd_output_printf(out, "Slave: ");
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snd_pcm_dump(copy->plug.gen.slave, out);
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}
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static const snd_pcm_ops_t snd_pcm_copy_ops = {
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.close = snd_pcm_generic_close,
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.info = snd_pcm_generic_info,
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.hw_refine = snd_pcm_copy_hw_refine,
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.hw_params = snd_pcm_copy_hw_params,
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.hw_free = snd_pcm_generic_hw_free,
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.sw_params = snd_pcm_generic_sw_params,
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.channel_info = snd_pcm_generic_channel_info,
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.dump = snd_pcm_copy_dump,
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.nonblock = snd_pcm_generic_nonblock,
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.async = snd_pcm_generic_async,
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.mmap = snd_pcm_generic_mmap,
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.munmap = snd_pcm_generic_munmap,
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.query_chmaps = snd_pcm_generic_query_chmaps,
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.get_chmap = snd_pcm_generic_get_chmap,
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.set_chmap = snd_pcm_generic_set_chmap,
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};
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/**
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* \brief Creates a new copy PCM
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* \param pcmp Returns created PCM handle
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* \param name Name of PCM
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* \param slave Slave PCM handle
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* \param close_slave When set, the slave PCM handle is closed with copy PCM
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* \retval zero on success otherwise a negative error code
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* \warning Using of this function might be dangerous in the sense
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* of compatibility reasons. The prototype might be freely
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* changed in future.
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*/
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int snd_pcm_copy_open(snd_pcm_t **pcmp, const char *name, snd_pcm_t *slave, int close_slave)
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{
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snd_pcm_t *pcm;
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snd_pcm_copy_t *copy;
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int err;
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assert(pcmp && slave);
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copy = calloc(1, sizeof(snd_pcm_copy_t));
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if (!copy) {
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return -ENOMEM;
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}
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snd_pcm_plugin_init(©->plug);
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copy->plug.read = snd_pcm_copy_read_areas;
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copy->plug.write = snd_pcm_copy_write_areas;
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copy->plug.undo_read = snd_pcm_plugin_undo_read_generic;
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copy->plug.undo_write = snd_pcm_plugin_undo_write_generic;
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copy->plug.gen.slave = slave;
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copy->plug.gen.close_slave = close_slave;
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err = snd_pcm_new(&pcm, SND_PCM_TYPE_COPY, name, slave->stream, slave->mode);
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if (err < 0) {
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free(copy);
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return err;
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}
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pcm->ops = &snd_pcm_copy_ops;
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pcm->fast_ops = &snd_pcm_plugin_fast_ops;
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pcm->private_data = copy;
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pcm->poll_fd = slave->poll_fd;
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pcm->poll_events = slave->poll_events;
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pcm->tstamp_type = slave->tstamp_type;
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snd_pcm_set_hw_ptr(pcm, ©->plug.hw_ptr, -1, 0);
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snd_pcm_set_appl_ptr(pcm, ©->plug.appl_ptr, -1, 0);
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*pcmp = pcm;
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return 0;
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}
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/*! \page pcm_plugins
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\section pcm_plugins_copy Plugin: copy
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This plugin copies samples from master copy PCM to given slave PCM.
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The channel count, format and rate must match for both of them.
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\code
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pcm.name {
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type copy # Copy PCM
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slave STR # Slave name
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# or
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slave { # Slave definition
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pcm STR # Slave PCM name
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# or
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pcm { } # Slave PCM definition
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}
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}
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\endcode
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\subsection pcm_plugins_copy_funcref Function reference
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<UL>
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<LI>snd_pcm_copy_open()
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<LI>_snd_pcm_copy_open()
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</UL>
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*/
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/**
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* \brief Creates a new copy PCM
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* \param pcmp Returns created PCM handle
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* \param name Name of PCM
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* \param root Root configuration node
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* \param conf Configuration node with copy PCM description
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* \param stream Stream type
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* \param mode Stream mode
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* \retval zero on success otherwise a negative error code
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* \warning Using of this function might be dangerous in the sense
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* of compatibility reasons. The prototype might be freely
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* changed in future.
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*/
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int _snd_pcm_copy_open(snd_pcm_t **pcmp, const char *name,
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snd_config_t *root, snd_config_t *conf,
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snd_pcm_stream_t stream, int mode)
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{
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snd_config_iterator_t i, next;
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int err;
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snd_pcm_t *spcm;
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snd_config_t *slave = NULL, *sconf;
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snd_config_for_each(i, next, conf) {
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snd_config_t *n = snd_config_iterator_entry(i);
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const char *id;
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (snd_pcm_conf_generic_id(id))
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continue;
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if (strcmp(id, "slave") == 0) {
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slave = n;
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continue;
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}
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SNDERR("Unknown field %s", id);
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return -EINVAL;
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}
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if (!slave) {
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SNDERR("slave is not defined");
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return -EINVAL;
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}
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err = snd_pcm_slave_conf(root, slave, &sconf, 0);
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if (err < 0)
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return err;
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err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode, conf);
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snd_config_delete(sconf);
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if (err < 0)
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return err;
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err = snd_pcm_copy_open(pcmp, name, spcm, 1);
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if (err < 0)
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snd_pcm_close(spcm);
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return err;
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}
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#ifndef DOC_HIDDEN
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SND_DLSYM_BUILD_VERSION(_snd_pcm_copy_open, SND_PCM_DLSYM_VERSION);
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#endif
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