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Diffstat (limited to '')
-rw-r--r-- | src/filter/replay_gain_filter_plugin.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/filter/replay_gain_filter_plugin.c b/src/filter/replay_gain_filter_plugin.c new file mode 100644 index 000000000..4d6080b73 --- /dev/null +++ b/src/filter/replay_gain_filter_plugin.c @@ -0,0 +1,239 @@ +/* + * Copyright (C) 2003-2010 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "filter/replay_gain_filter_plugin.h" +#include "filter_plugin.h" +#include "filter_internal.h" +#include "filter_registry.h" +#include "audio_format.h" +#include "pcm_buffer.h" +#include "pcm_volume.h" +#include "replay_gain_info.h" +#include "replay_gain_config.h" +#include "mixer_control.h" + +#include <assert.h> +#include <string.h> + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "replay_gain" + +struct replay_gain_filter { + struct filter filter; + + /** + * If set, then this hardware mixer is used for applying + * replay gain, instead of the software volume library. + */ + struct mixer *mixer; + + /** + * The base volume level for scale=1.0, between 1 and 100 + * (including). + */ + unsigned base; + + enum replay_gain_mode mode; + + struct replay_gain_info info; + + /** + * The current volume, between 0 and #PCM_VOLUME_1 (both + * including). + */ + unsigned volume; + + struct audio_format audio_format; + + struct pcm_buffer buffer; +}; + +static inline GQuark +replay_gain_quark(void) +{ + return g_quark_from_static_string("replay_gain"); +} + +/** + * Recalculates the new volume after a property was changed. + */ +static void +replay_gain_filter_update(struct replay_gain_filter *filter) +{ + if (filter->mode != REPLAY_GAIN_OFF) { + float scale = replay_gain_tuple_scale(&filter->info.tuples[filter->mode], + replay_gain_preamp, replay_gain_missing_preamp, replay_gain_limit); + g_debug("scale=%f\n", (double)scale); + + filter->volume = pcm_float_to_volume(scale); + } else + filter->volume = PCM_VOLUME_1; + + if (filter->mixer != NULL) { + /* update the hardware mixer volume */ + + unsigned volume = (filter->volume * filter->base) / PCM_VOLUME_1; + if (volume > 100) + volume = 100; + + GError *error = NULL; + if (!mixer_set_volume(filter->mixer, volume, &error)) { + g_warning("Failed to update hardware mixer: %s", + error->message); + g_error_free(error); + } + } +} + +static struct filter * +replay_gain_filter_init(G_GNUC_UNUSED const struct config_param *param, + G_GNUC_UNUSED GError **error_r) +{ + struct replay_gain_filter *filter = g_new(struct replay_gain_filter, 1); + + filter_init(&filter->filter, &replay_gain_filter_plugin); + filter->mixer = NULL; + + filter->mode = replay_gain_get_real_mode(); + replay_gain_info_init(&filter->info); + filter->volume = PCM_VOLUME_1; + + return &filter->filter; +} + +static void +replay_gain_filter_finish(struct filter *filter) +{ + g_free(filter); +} + +static const struct audio_format * +replay_gain_filter_open(struct filter *_filter, + struct audio_format *audio_format, + G_GNUC_UNUSED GError **error_r) +{ + struct replay_gain_filter *filter = + (struct replay_gain_filter *)_filter; + + audio_format->reverse_endian = false; + + filter->audio_format = *audio_format; + pcm_buffer_init(&filter->buffer); + + return &filter->audio_format; +} + +static void +replay_gain_filter_close(struct filter *_filter) +{ + struct replay_gain_filter *filter = + (struct replay_gain_filter *)_filter; + + pcm_buffer_deinit(&filter->buffer); +} + +static const void * +replay_gain_filter_filter(struct filter *_filter, + const void *src, size_t src_size, + size_t *dest_size_r, GError **error_r) +{ + struct replay_gain_filter *filter = + (struct replay_gain_filter *)_filter; + bool success; + void *dest; + enum replay_gain_mode rg_mode; + + /* check if the mode has been changed since the last call */ + rg_mode = replay_gain_get_real_mode(); + + if (filter->mode != rg_mode) { + g_debug("replay gain mode has changed %d->%d\n", filter->mode, rg_mode); + filter->mode = rg_mode; + replay_gain_filter_update(filter); + } + + *dest_size_r = src_size; + + if (filter->volume >= PCM_VOLUME_1) + /* optimized special case: 100% volume = no-op */ + return src; + + dest = pcm_buffer_get(&filter->buffer, src_size); + + if (filter->volume <= 0) { + /* optimized special case: 0% volume = memset(0) */ + /* XXX is this valid for all sample formats? What + about floating point? */ + memset(dest, 0, src_size); + return dest; + } + + memcpy(dest, src, src_size); + + success = pcm_volume(dest, src_size, &filter->audio_format, + filter->volume); + if (!success) { + g_set_error(error_r, replay_gain_quark(), 0, + "pcm_volume() has failed"); + return NULL; + } + + return dest; +} + +const struct filter_plugin replay_gain_filter_plugin = { + .name = "replay_gain", + .init = replay_gain_filter_init, + .finish = replay_gain_filter_finish, + .open = replay_gain_filter_open, + .close = replay_gain_filter_close, + .filter = replay_gain_filter_filter, +}; + +void +replay_gain_filter_set_mixer(struct filter *_filter, struct mixer *mixer, + unsigned base) +{ + struct replay_gain_filter *filter = + (struct replay_gain_filter *)_filter; + + assert(mixer == NULL || (base > 0 && base <= 100)); + + filter->mixer = mixer; + filter->base = base; + + replay_gain_filter_update(filter); +} + +void +replay_gain_filter_set_info(struct filter *_filter, + const struct replay_gain_info *info) +{ + struct replay_gain_filter *filter = + (struct replay_gain_filter *)_filter; + + if (info != NULL) { + filter->info = *info; + replay_gain_info_complete(&filter->info); + } else + replay_gain_info_init(&filter->info); + + replay_gain_filter_update(filter); +} |