/** * \file pcm/pcm_copy.c * \ingroup PCM_Plugins * \brief PCM Copy Plugin Interface * \author Abramo Bagnara * \date 2000-2001 */ /* * PCM - Copy conversion * Copyright (c) 2000 by Abramo Bagnara * * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ #include "bswap.h" #include "pcm_local.h" #include "pcm_plugin.h" #ifndef PIC /* entry for static linking */ const char *_snd_module_pcm_copy = ""; #endif #ifndef DOC_HIDDEN typedef struct { /* This field need to be the first */ snd_pcm_plugin_t plug; } snd_pcm_copy_t; #endif static int snd_pcm_copy_hw_refine_cprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params) { int err; snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM }; err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_ACCESS, &access_mask); if (err < 0) return err; params->info &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID); return 0; } static int snd_pcm_copy_hw_refine_sprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *sparams) { snd_pcm_access_mask_t saccess_mask = { SND_PCM_ACCBIT_MMAP }; _snd_pcm_hw_params_any(sparams); _snd_pcm_hw_param_set_mask(sparams, SND_PCM_HW_PARAM_ACCESS, &saccess_mask); return 0; } static int snd_pcm_copy_hw_refine_schange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params, snd_pcm_hw_params_t *sparams) { int err; unsigned int links = ~SND_PCM_HW_PARBIT_ACCESS; err = _snd_pcm_hw_params_refine(sparams, links, params); if (err < 0) return err; return 0; } static int snd_pcm_copy_hw_refine_cchange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params, snd_pcm_hw_params_t *sparams) { int err; unsigned int links = ~SND_PCM_HW_PARBIT_ACCESS; err = _snd_pcm_hw_params_refine(params, links, sparams); if (err < 0) return err; return 0; } static int snd_pcm_copy_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) { return snd_pcm_hw_refine_slave(pcm, params, snd_pcm_copy_hw_refine_cprepare, snd_pcm_copy_hw_refine_cchange, snd_pcm_copy_hw_refine_sprepare, snd_pcm_copy_hw_refine_schange, snd_pcm_generic_hw_refine); } static int snd_pcm_copy_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) { return snd_pcm_hw_params_slave(pcm, params, snd_pcm_copy_hw_refine_cchange, snd_pcm_copy_hw_refine_sprepare, snd_pcm_copy_hw_refine_schange, snd_pcm_generic_hw_params); } static snd_pcm_uframes_t snd_pcm_copy_write_areas(snd_pcm_t *pcm, const snd_pcm_channel_area_t *areas, snd_pcm_uframes_t offset, snd_pcm_uframes_t size, const snd_pcm_channel_area_t *slave_areas, snd_pcm_uframes_t slave_offset, snd_pcm_uframes_t *slave_sizep) { if (size > *slave_sizep) size = *slave_sizep; snd_pcm_areas_copy(slave_areas, slave_offset, areas, offset, pcm->channels, size, pcm->format); *slave_sizep = size; return size; } static snd_pcm_uframes_t snd_pcm_copy_read_areas(snd_pcm_t *pcm, const snd_pcm_channel_area_t *areas, snd_pcm_uframes_t offset, snd_pcm_uframes_t size, const snd_pcm_channel_area_t *slave_areas, snd_pcm_uframes_t slave_offset, snd_pcm_uframes_t *slave_sizep) { if (size > *slave_sizep) size = *slave_sizep; snd_pcm_areas_copy(areas, offset, slave_areas, slave_offset, pcm->channels, size, pcm->format); *slave_sizep = size; return size; } static void snd_pcm_copy_dump(snd_pcm_t *pcm, snd_output_t *out) { snd_pcm_copy_t *copy = pcm->private_data; snd_output_printf(out, "Copy conversion PCM\n"); if (pcm->setup) { snd_output_printf(out, "Its setup is:\n"); snd_pcm_dump_setup(pcm, out); } snd_output_printf(out, "Slave: "); snd_pcm_dump(copy->plug.gen.slave, out); } static const snd_pcm_ops_t snd_pcm_copy_ops = { .close = snd_pcm_generic_close, .info = snd_pcm_generic_info, .hw_refine = snd_pcm_copy_hw_refine, .hw_params = snd_pcm_copy_hw_params, .hw_free = snd_pcm_generic_hw_free, .sw_params = snd_pcm_generic_sw_params, .channel_info = snd_pcm_generic_channel_info, .dump = snd_pcm_copy_dump, .nonblock = snd_pcm_generic_nonblock, .async = snd_pcm_generic_async, .mmap = snd_pcm_generic_mmap, .munmap = snd_pcm_generic_munmap, .query_chmaps = snd_pcm_generic_query_chmaps, .get_chmap = snd_pcm_generic_get_chmap, .set_chmap = snd_pcm_generic_set_chmap, }; /** * \brief Creates a new copy PCM * \param pcmp Returns created PCM handle * \param name Name of PCM * \param slave Slave PCM handle * \param close_slave When set, the slave PCM handle is closed with copy PCM * \retval zero on success otherwise a negative error code * \warning Using of this function might be dangerous in the sense * of compatibility reasons. The prototype might be freely * changed in future. */ int snd_pcm_copy_open(snd_pcm_t **pcmp, const char *name, snd_pcm_t *slave, int close_slave) { snd_pcm_t *pcm; snd_pcm_copy_t *copy; int err; assert(pcmp && slave); copy = calloc(1, sizeof(snd_pcm_copy_t)); if (!copy) { return -ENOMEM; } snd_pcm_plugin_init(©->plug); copy->plug.read = snd_pcm_copy_read_areas; copy->plug.write = snd_pcm_copy_write_areas; copy->plug.undo_read = snd_pcm_plugin_undo_read_generic; copy->plug.undo_write = snd_pcm_plugin_undo_write_generic; copy->plug.gen.slave = slave; copy->plug.gen.close_slave = close_slave; err = snd_pcm_new(&pcm, SND_PCM_TYPE_COPY, name, slave->stream, slave->mode); if (err < 0) { free(copy); return err; } pcm->ops = &snd_pcm_copy_ops; pcm->fast_ops = &snd_pcm_plugin_fast_ops; pcm->private_data = copy; pcm->poll_fd = slave->poll_fd; pcm->poll_events = slave->poll_events; pcm->tstamp_type = slave->tstamp_type; snd_pcm_set_hw_ptr(pcm, ©->plug.hw_ptr, -1, 0); snd_pcm_set_appl_ptr(pcm, ©->plug.appl_ptr, -1, 0); *pcmp = pcm; return 0; } /*! \page pcm_plugins \section pcm_plugins_copy Plugin: copy This plugin copies samples from master copy PCM to given slave PCM. The channel count, format and rate must match for both of them. \code pcm.name { type copy # Copy PCM slave STR # Slave name # or slave { # Slave definition pcm STR # Slave PCM name # or pcm { } # Slave PCM definition } } \endcode \subsection pcm_plugins_copy_funcref Function reference */ /** * \brief Creates a new copy PCM * \param pcmp Returns created PCM handle * \param name Name of PCM * \param root Root configuration node * \param conf Configuration node with copy PCM description * \param stream Stream type * \param mode Stream mode * \retval zero on success otherwise a negative error code * \warning Using of this function might be dangerous in the sense * of compatibility reasons. The prototype might be freely * changed in future. */ int _snd_pcm_copy_open(snd_pcm_t **pcmp, const char *name, snd_config_t *root, snd_config_t *conf, snd_pcm_stream_t stream, int mode) { snd_config_iterator_t i, next; int err; snd_pcm_t *spcm; snd_config_t *slave = NULL, *sconf; snd_config_for_each(i, next, conf) { snd_config_t *n = snd_config_iterator_entry(i); const char *id; if (snd_config_get_id(n, &id) < 0) continue; if (snd_pcm_conf_generic_id(id)) continue; if (strcmp(id, "slave") == 0) { slave = n; continue; } SNDERR("Unknown field %s", id); return -EINVAL; } if (!slave) { SNDERR("slave is not defined"); return -EINVAL; } err = snd_pcm_slave_conf(root, slave, &sconf, 0); if (err < 0) return err; err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode, conf); snd_config_delete(sconf); if (err < 0) return err; err = snd_pcm_copy_open(pcmp, name, spcm, 1); if (err < 0) snd_pcm_close(spcm); return err; } #ifndef DOC_HIDDEN SND_DLSYM_BUILD_VERSION(_snd_pcm_copy_open, SND_PCM_DLSYM_VERSION); #endif