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Diffstat (limited to 'src/filter/route_filter_plugin.c')
| -rw-r--r-- | src/filter/route_filter_plugin.c | 348 |
1 files changed, 0 insertions, 348 deletions
diff --git a/src/filter/route_filter_plugin.c b/src/filter/route_filter_plugin.c deleted file mode 100644 index 3bf8677e..00000000 --- a/src/filter/route_filter_plugin.c +++ /dev/null @@ -1,348 +0,0 @@ -/* - * Copyright (C) 2003-2011 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. - */ - -/** \file - * - * This filter copies audio data between channels. Useful for - * upmixing mono/stereo audio to surround speaker configurations. - * - * Its configuration consists of a "filter" section with a single - * "routes" entry, formatted as: \\ - * routes "0>1, 1>0, 2>2, 3>3, 3>4" \\ - * where each pair of numbers signifies a set of channels. - * Each source>dest pair leads to the data from channel #source - * being copied to channel #dest in the output. - * - * Example: \\ - * routes "0>0, 1>1, 0>2, 1>3"\\ - * upmixes stereo audio to a 4-speaker system, copying the front-left - * (0) to front left (0) and rear left (2), copying front-right (1) to - * front-right (1) and rear-right (3). - * - * If multiple sources are copied to the same destination channel, only - * one of them takes effect. - */ - -#include "config.h" -#include "conf.h" -#include "audio_format.h" -#include "audio_check.h" -#include "filter_plugin.h" -#include "filter_internal.h" -#include "filter_registry.h" -#include "pcm_buffer.h" - -#include <assert.h> -#include <string.h> -#include <stdlib.h> - - -struct route_filter { - - /** - * Inherit (and support cast to/from) filter - */ - struct filter base; - - /** - * The minimum number of channels we need for output - * to be able to perform all the copies the user has specified - */ - unsigned char min_output_channels; - - /** - * The minimum number of input channels we need to - * copy all the data the user has requested. If fewer - * than this many are supplied by the input, undefined - * copy operations are given zeroed sources in stead. - */ - unsigned char min_input_channels; - - /** - * The set of copy operations to perform on each sample - * The index is an output channel to use, the value is - * a corresponding input channel from which to take the - * data. A -1 means "no source" - */ - signed char* sources; - - /** - * The actual input format of our signal, once opened - */ - struct audio_format input_format; - - /** - * The decided upon output format, once opened - */ - struct audio_format output_format; - - /** - * The size, in bytes, of each multichannel frame in the - * input buffer - */ - size_t input_frame_size; - - /** - * The size, in bytes, of each multichannel frame in the - * output buffer - */ - size_t output_frame_size; - - /** - * The output buffer used last time around, can be reused if the size doesn't differ. - */ - struct pcm_buffer output_buffer; - -}; - -/** - * Parse the "routes" section, a string on the form - * a>b, c>d, e>f, ... - * where a... are non-unique, non-negative integers - * and input channel a gets copied to output channel b, etc. - * @param param the configuration block to read - * @param filter a route_filter whose min_channels and sources[] to set - * @return true on success, false on error - */ -static bool -route_filter_parse(const struct config_param *param, - struct route_filter *filter, - GError **error_r) { - - /* TODO: - * With a more clever way of marking "don't copy to output N", - * This could easily be merged into a single loop with some - * dynamic g_realloc() instead of one count run and one g_malloc(). - */ - - gchar **tokens; - int number_of_copies; - - // A cowardly default, just passthrough stereo - const char *routes = - config_get_block_string(param, "routes", "0>0, 1>1"); - - filter->min_input_channels = 0; - filter->min_output_channels = 0; - - tokens = g_strsplit(routes, ",", 255); - number_of_copies = g_strv_length(tokens); - - // Start by figuring out a few basic things about the routing set - for (int c=0; c<number_of_copies; ++c) { - - // String and int representations of the source/destination - gchar **sd; - int source, dest; - - // Squeeze whitespace - g_strstrip(tokens[c]); - - // Split the a>b string into source and destination - sd = g_strsplit(tokens[c], ">", 2); - if (g_strv_length(sd) != 2) { - g_set_error(error_r, config_quark(), 1, - "Invalid copy around %d in routes spec: %s", - param->line, tokens[c]); - g_strfreev(sd); - g_strfreev(tokens); - return false; - } - - source = strtol(sd[0], NULL, 10); - dest = strtol(sd[1], NULL, 10); - - // Keep track of the highest channel numbers seen - // as either in- or outputs - if (source >= filter->min_input_channels) - filter->min_input_channels = source + 1; - if (dest >= filter->min_output_channels) - filter->min_output_channels = dest + 1; - - g_strfreev(sd); - } - - if (!audio_valid_channel_count(filter->min_output_channels)) { - g_strfreev(tokens); - g_set_error(error_r, audio_format_quark(), 0, - "Invalid number of output channels requested: %d", - filter->min_output_channels); - return false; - } - - // Allocate a map of "copy nothing to me" - filter->sources = - g_malloc(filter->min_output_channels * sizeof(signed char)); - - for (int i=0; i<filter->min_output_channels; ++i) - filter->sources[i] = -1; - - // Run through the spec again, and save the - // actual mapping output <- input - for (int c=0; c<number_of_copies; ++c) { - - // String and int representations of the source/destination - gchar **sd; - int source, dest; - - // Split the a>b string into source and destination - sd = g_strsplit(tokens[c], ">", 2); - if (g_strv_length(sd) != 2) { - g_set_error(error_r, config_quark(), 1, - "Invalid copy around %d in routes spec: %s", - param->line, tokens[c]); - g_strfreev(sd); - g_strfreev(tokens); - return false; - } - - source = strtol(sd[0], NULL, 10); - dest = strtol(sd[1], NULL, 10); - - filter->sources[dest] = source; - - g_strfreev(sd); - } - - g_strfreev(tokens); - - return true; -} - -static struct filter * -route_filter_init(const struct config_param *param, - G_GNUC_UNUSED GError **error_r) -{ - struct route_filter *filter = g_new(struct route_filter, 1); - filter_init(&filter->base, &route_filter_plugin); - - // Allocate and set the filter->sources[] array - route_filter_parse(param, filter, error_r); - - return &filter->base; -} - -static void -route_filter_finish(struct filter *_filter) -{ - struct route_filter *filter = (struct route_filter *)_filter; - - g_free(filter->sources); - g_free(filter); -} - -static const struct audio_format * -route_filter_open(struct filter *_filter, struct audio_format *audio_format, - G_GNUC_UNUSED GError **error_r) -{ - struct route_filter *filter = (struct route_filter *)_filter; - - // Copy the input format for later reference - filter->input_format = *audio_format; - filter->input_frame_size = - audio_format_frame_size(&filter->input_format); - - // Decide on an output format which has enough channels, - // and is otherwise identical - filter->output_format = *audio_format; - filter->output_format.channels = filter->min_output_channels; - - // Precalculate this simple value, to speed up allocation later - filter->output_frame_size = - audio_format_frame_size(&filter->output_format); - - // This buffer grows as needed - pcm_buffer_init(&filter->output_buffer); - - return &filter->output_format; -} - -static void -route_filter_close(struct filter *_filter) -{ - struct route_filter *filter = (struct route_filter *)_filter; - - pcm_buffer_deinit(&filter->output_buffer); -} - -static const void * -route_filter_filter(struct filter *_filter, - const void *src, size_t src_size, - size_t *dest_size_r, G_GNUC_UNUSED GError **error_r) -{ - struct route_filter *filter = (struct route_filter *)_filter; - - size_t number_of_frames = src_size / filter->input_frame_size; - - size_t bytes_per_frame_per_channel = - audio_format_sample_size(&filter->input_format); - - // A moving pointer that always refers to channel 0 in the input, at the currently handled frame - const uint8_t *base_source = src; - - // A moving pointer that always refers to the currently filled channel of the currently handled frame, in the output - uint8_t *chan_destination; - - // Grow our reusable buffer, if needed, and set the moving pointer - *dest_size_r = number_of_frames * filter->output_frame_size; - chan_destination = pcm_buffer_get(&filter->output_buffer, *dest_size_r); - - - // Perform our copy operations, with N input channels and M output channels - for (unsigned int s=0; s<number_of_frames; ++s) { - - // Need to perform one copy per output channel - for (unsigned int c=0; c<filter->min_output_channels; ++c) { - if (filter->sources[c] == -1 || - (unsigned)filter->sources[c] >= filter->input_format.channels) { - // No source for this destination output, - // give it zeroes as input - memset(chan_destination, - 0x00, - bytes_per_frame_per_channel); - } else { - // Get the data from channel sources[c] - // and copy it to the output - const uint8_t *data = base_source + - (filter->sources[c] * bytes_per_frame_per_channel); - memcpy(chan_destination, - data, - bytes_per_frame_per_channel); - } - // Move on to the next output channel - chan_destination += bytes_per_frame_per_channel; - } - - - // Go on to the next N input samples - base_source += filter->input_frame_size; - } - - // Here it is, ladies and gentlemen! Rerouted data! - return (void *) filter->output_buffer.buffer; -} - -const struct filter_plugin route_filter_plugin = { - .name = "route", - .init = route_filter_init, - .finish = route_filter_finish, - .open = route_filter_open, - .close = route_filter_close, - .filter = route_filter_filter, -}; |