/* * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include "pcm_local.h" #include "pcm_plugin.h" #ifndef PIC /* entry for static linking */ const char *_snd_module_pcm_copy = ""; #endif typedef struct { /* This field need to be the first */ snd_pcm_plugin_t plug; } snd_pcm_copy_t; 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_plugin_hw_refine_slave); } 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_plugin_hw_params_slave); } 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.slave, out); } snd_pcm_ops_t snd_pcm_copy_ops = { close: snd_pcm_plugin_close, info: snd_pcm_plugin_info, hw_refine: snd_pcm_copy_hw_refine, hw_params: snd_pcm_copy_hw_params, hw_free: snd_pcm_plugin_hw_free, sw_params: snd_pcm_plugin_sw_params, channel_info: snd_pcm_plugin_channel_info, dump: snd_pcm_copy_dump, nonblock: snd_pcm_plugin_nonblock, async: snd_pcm_plugin_async, mmap: snd_pcm_plugin_mmap, munmap: snd_pcm_plugin_munmap, }; 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; } copy->plug.read = snd_pcm_copy_read_areas; copy->plug.write = snd_pcm_copy_write_areas; copy->plug.slave = slave; copy->plug.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->hw_ptr = ©->plug.hw_ptr; pcm->appl_ptr = ©->plug.appl_ptr; *pcmp = pcm; return 0; } 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); 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; } SND_DLSYM_BUILD_VERSION(_snd_pcm_copy_open, SND_PCM_DLSYM_VERSION);