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authorMax Kellermann <max@duempel.org>2015-08-15 15:55:46 +0200
committerMax Kellermann <max@duempel.org>2015-08-15 15:55:46 +0200
commit5fba8d773c3f6ea35a2934baa91372806f1c9940 (patch)
tree8afb1d6383f4bac521b7aa544f823a698e5a479d /src/CrossFade.cxx
parent36cd73df51c6bae6b283f1bf14704d86ad98b3c5 (diff)
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PlayerThread, ...: move to src/player/
Diffstat (limited to 'src/CrossFade.cxx')
-rw-r--r--src/CrossFade.cxx140
1 files changed, 0 insertions, 140 deletions
diff --git a/src/CrossFade.cxx b/src/CrossFade.cxx
deleted file mode 100644
index 6d7b41440..000000000
--- a/src/CrossFade.cxx
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
- * Copyright (C) 2003-2015 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 "CrossFade.hxx"
-#include "Chrono.hxx"
-#include "MusicChunk.hxx"
-#include "AudioFormat.hxx"
-#include "util/NumberParser.hxx"
-#include "util/Domain.hxx"
-#include "Log.hxx"
-
-#include <assert.h>
-
-static constexpr Domain cross_fade_domain("cross_fade");
-
-gcc_pure
-static float
-mixramp_interpolate(const char *ramp_list, float required_db)
-{
- float last_db = 0, last_secs = 0;
- bool have_last = false;
-
- /* ramp_list is a string of pairs of dBs and seconds that describe the
- * volume profile. Delimiters are semi-colons between pairs and spaces
- * between the dB and seconds of a pair.
- * The dB values must be monotonically increasing for this to work. */
-
- while (1) {
- /* Parse the dB value. */
- char *endptr;
- const float db = ParseFloat(ramp_list, &endptr);
- if (endptr == ramp_list || *endptr != ' ')
- break;
-
- ramp_list = endptr + 1;
-
- /* Parse the time. */
- float secs = ParseFloat(ramp_list, &endptr);
- if (endptr == ramp_list || (*endptr != ';' && *endptr != 0))
- break;
-
- ramp_list = endptr;
- if (*ramp_list == ';')
- ++ramp_list;
-
- /* Check for exact match. */
- if (db == required_db) {
- return secs;
- }
-
- /* Save if too quiet. */
- if (db < required_db) {
- last_db = db;
- last_secs = secs;
- have_last = true;
- continue;
- }
-
- /* If required db < any stored value, use the least. */
- if (!have_last)
- return secs;
-
- /* Finally, interpolate linearly. */
- secs = last_secs + (required_db - last_db) * (secs - last_secs) / (db - last_db);
- return secs;
- }
-
- return -1;
-}
-
-unsigned
-CrossFadeSettings::Calculate(SignedSongTime total_time,
- float replay_gain_db, float replay_gain_prev_db,
- const char *mixramp_start, const char *mixramp_prev_end,
- const AudioFormat af,
- const AudioFormat old_format,
- unsigned max_chunks) const
-{
- unsigned int chunks = 0;
- float chunks_f;
-
- if (total_time.IsNegative() ||
- duration < 0 || duration >= total_time.ToDoubleS() ||
- /* we can't crossfade when the audio formats are different */
- af != old_format)
- return 0;
-
- assert(duration >= 0);
- assert(af.IsValid());
-
- chunks_f = (float)af.GetTimeToSize() / (float)CHUNK_SIZE;
-
- if (mixramp_delay <= 0 || !mixramp_start || !mixramp_prev_end) {
- chunks = (chunks_f * duration + 0.5);
- } else {
- /* Calculate mixramp overlap. */
- const float mixramp_overlap_current =
- mixramp_interpolate(mixramp_start,
- mixramp_db - replay_gain_db);
- const float mixramp_overlap_prev =
- mixramp_interpolate(mixramp_prev_end,
- mixramp_db - replay_gain_prev_db);
- const float mixramp_overlap =
- mixramp_overlap_current + mixramp_overlap_prev;
-
- if (mixramp_overlap_current >= 0 &&
- mixramp_overlap_prev >= 0 &&
- mixramp_delay <= mixramp_overlap) {
- chunks = (chunks_f * (mixramp_overlap - mixramp_delay));
- FormatDebug(cross_fade_domain,
- "will overlap %d chunks, %fs", chunks,
- mixramp_overlap - mixramp_delay);
- }
- }
-
- if (chunks > max_chunks) {
- chunks = max_chunks;
- LogWarning(cross_fade_domain,
- "audio_buffer_size too small for computed MixRamp overlap");
- }
-
- return chunks;
-}