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-rw-r--r--src/MusicPipe.cxx179
1 files changed, 179 insertions, 0 deletions
diff --git a/src/MusicPipe.cxx b/src/MusicPipe.cxx
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--- /dev/null
+++ b/src/MusicPipe.cxx
@@ -0,0 +1,179 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "MusicPipe.hxx"
+#include "MusicBuffer.hxx"
+#include "MusicChunk.hxx"
+#include "thread/Mutex.hxx"
+
+#include <glib.h>
+
+#include <assert.h>
+
+struct music_pipe {
+ /** the first chunk */
+ struct music_chunk *head;
+
+ /** a pointer to the tail of the chunk */
+ struct music_chunk **tail_r;
+
+ /** the current number of chunks */
+ unsigned size;
+
+ /** a mutex which protects #head and #tail_r */
+ mutable Mutex mutex;
+
+#ifndef NDEBUG
+ struct audio_format audio_format;
+#endif
+
+ music_pipe()
+ :head(nullptr), tail_r(&head), size(0) {
+#ifndef NDEBUG
+ audio_format_clear(&audio_format);
+#endif
+ }
+
+ ~music_pipe() {
+ assert(head == nullptr);
+ assert(tail_r == &head);
+ }
+};
+
+struct music_pipe *
+music_pipe_new(void)
+{
+ return new music_pipe();
+}
+
+void
+music_pipe_free(struct music_pipe *mp)
+{
+ delete mp;
+}
+
+#ifndef NDEBUG
+
+bool
+music_pipe_check_format(const struct music_pipe *pipe,
+ const struct audio_format *audio_format)
+{
+ assert(pipe != NULL);
+ assert(audio_format != NULL);
+
+ return !audio_format_defined(&pipe->audio_format) ||
+ audio_format_equals(&pipe->audio_format, audio_format);
+}
+
+bool
+music_pipe_contains(const struct music_pipe *mp,
+ const struct music_chunk *chunk)
+{
+ const ScopeLock protect(mp->mutex);
+
+ for (const struct music_chunk *i = mp->head;
+ i != NULL; i = i->next)
+ if (i == chunk)
+ return true;
+
+ return false;
+}
+
+#endif
+
+const struct music_chunk *
+music_pipe_peek(const struct music_pipe *mp)
+{
+ return mp->head;
+}
+
+struct music_chunk *
+music_pipe_shift(struct music_pipe *mp)
+{
+ const ScopeLock protect(mp->mutex);
+
+ struct music_chunk *chunk = mp->head;
+ if (chunk != NULL) {
+ assert(!chunk->IsEmpty());
+
+ mp->head = chunk->next;
+ --mp->size;
+
+ if (mp->head == NULL) {
+ assert(mp->size == 0);
+ assert(mp->tail_r == &chunk->next);
+
+ mp->tail_r = &mp->head;
+ } else {
+ assert(mp->size > 0);
+ assert(mp->tail_r != &chunk->next);
+ }
+
+#ifndef NDEBUG
+ /* poison the "next" reference */
+ chunk->next = (struct music_chunk *)(void *)0x01010101;
+
+ if (mp->size == 0)
+ audio_format_clear(&mp->audio_format);
+#endif
+ }
+
+ return chunk;
+}
+
+void
+music_pipe_clear(struct music_pipe *mp, struct music_buffer *buffer)
+{
+ struct music_chunk *chunk;
+
+ while ((chunk = music_pipe_shift(mp)) != NULL)
+ music_buffer_return(buffer, chunk);
+}
+
+void
+music_pipe_push(struct music_pipe *mp, struct music_chunk *chunk)
+{
+ assert(!chunk->IsEmpty());
+ assert(chunk->length == 0 || audio_format_valid(&chunk->audio_format));
+
+ const ScopeLock protect(mp->mutex);
+
+ assert(mp->size > 0 || !audio_format_defined(&mp->audio_format));
+ assert(!audio_format_defined(&mp->audio_format) ||
+ chunk->CheckFormat(mp->audio_format));
+
+#ifndef NDEBUG
+ if (!audio_format_defined(&mp->audio_format) && chunk->length > 0)
+ mp->audio_format = chunk->audio_format;
+#endif
+
+ chunk->next = NULL;
+ *mp->tail_r = chunk;
+ mp->tail_r = &chunk->next;
+
+ ++mp->size;
+}
+
+unsigned
+music_pipe_size(const struct music_pipe *mp)
+{
+ const ScopeLock protect(mp->mutex);
+ return mp->size;
+}