output_*: convert to C++

1 files changed, 608 insertions, 0 deletions

diff --git a/src/OutputAll.cxx b/src/OutputAll.cxx
new file mode 100644
index 00000000..ec716a41
--- /dev/null
+++ b/src/OutputAll.cxx
@@ -0,0 +1,608 @@
+/*
+ * 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"
+
+extern "C" {
+#include "output_all.h"
+#include "output_internal.h"
+}
+
+#include "OutputControl.hxx"
+#include "OutputError.hxx"
+#include "mpd_error.h"
+
+extern "C" {
+#include "player_control.h"
+#include "conf.h"
+#include "chunk.h"
+#include "pipe.h"
+#include "buffer.h"
+#include "notify.h"
+}
+
+#ifndef NDEBUG
+#include "chunk.h"
+#endif
+
+#include <assert.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "output"
+
+static struct audio_format input_audio_format;
+
+static struct audio_output **audio_outputs;
+static unsigned int num_audio_outputs;
+
+/**
+ * The #music_buffer object where consumed chunks are returned.
+ */
+static struct music_buffer *g_music_buffer;
+
+/**
+ * The #music_pipe object which feeds all audio outputs.  It is filled
+ * by audio_output_all_play().
+ */
+static struct music_pipe *g_mp;
+
+/**
+ * The "elapsed_time" stamp of the most recently finished chunk.
+ */
+static float audio_output_all_elapsed_time = -1.0;
+
+unsigned int audio_output_count(void)
+{
+	return num_audio_outputs;
+}
+
+struct audio_output *
+audio_output_get(unsigned i)
+{
+	assert(i < num_audio_outputs);
+
+	assert(audio_outputs[i] != NULL);
+
+	return audio_outputs[i];
+}
+
+struct audio_output *
+audio_output_find(const char *name)
+{
+	for (unsigned i = 0; i < num_audio_outputs; ++i) {
+		struct audio_output *ao = audio_output_get(i);
+
+		if (strcmp(ao->name, name) == 0)
+			return ao;
+	}
+
+	/* name not found */
+	return NULL;
+}
+
+static unsigned
+audio_output_config_count(void)
+{
+	unsigned int nr = 0;
+	const struct config_param *param = NULL;
+
+	while ((param = config_get_next_param(CONF_AUDIO_OUTPUT, param)))
+		nr++;
+	if (!nr)
+		nr = 1; /* we'll always have at least one device  */
+	return nr;
+}
+
+void
+audio_output_all_init(struct player_control *pc)
+{
+	const struct config_param *param = NULL;
+	unsigned int i;
+	GError *error = NULL;
+
+	notify_init(&audio_output_client_notify);
+
+	num_audio_outputs = audio_output_config_count();
+	audio_outputs = g_new(struct audio_output *, num_audio_outputs);
+
+	for (i = 0; i < num_audio_outputs; i++)
+	{
+		unsigned int j;
+
+		param = config_get_next_param(CONF_AUDIO_OUTPUT, param);
+
+		/* only allow param to be NULL if there just one audioOutput */
+		assert(param || (num_audio_outputs == 1));
+
+		struct audio_output *output = audio_output_new(param, pc, &error);
+		if (output == NULL) {
+			if (param != NULL)
+				MPD_ERROR("line %i: %s",
+					  param->line, error->message);
+			else
+				MPD_ERROR("%s", error->message);
+		}
+
+		audio_outputs[i] = output;
+
+		/* require output names to be unique: */
+		for (j = 0; j < i; j++) {
+			if (!strcmp(output->name, audio_outputs[j]->name)) {
+				MPD_ERROR("output devices with identical "
+					  "names: %s\n", output->name);
+			}
+		}
+	}
+}
+
+void
+audio_output_all_finish(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_audio_outputs; i++) {
+		audio_output_disable(audio_outputs[i]);
+		audio_output_finish(audio_outputs[i]);
+	}
+
+	g_free(audio_outputs);
+	audio_outputs = NULL;
+	num_audio_outputs = 0;
+
+	notify_deinit(&audio_output_client_notify);
+}
+
+void
+audio_output_all_enable_disable(void)
+{
+	for (unsigned i = 0; i < num_audio_outputs; i++) {
+		struct audio_output *ao = audio_outputs[i];
+		bool enabled;
+
+		g_mutex_lock(ao->mutex);
+		enabled = ao->really_enabled;
+		g_mutex_unlock(ao->mutex);
+
+		if (ao->enabled != enabled) {
+			if (ao->enabled)
+				audio_output_enable(ao);
+			else
+				audio_output_disable(ao);
+		}
+	}
+}
+
+/**
+ * Determine if all (active) outputs have finished the current
+ * command.
+ */
+static bool
+audio_output_all_finished(void)
+{
+	for (unsigned i = 0; i < num_audio_outputs; ++i) {
+		struct audio_output *ao = audio_outputs[i];
+		bool not_finished;
+
+		g_mutex_lock(ao->mutex);
+		not_finished = audio_output_is_open(ao) &&
+			!audio_output_command_is_finished(ao);
+		g_mutex_unlock(ao->mutex);
+
+		if (not_finished)
+			return false;
+	}
+
+	return true;
+}
+
+static void audio_output_wait_all(void)
+{
+	while (!audio_output_all_finished())
+		notify_wait(&audio_output_client_notify);
+}
+
+/**
+ * Signals all audio outputs which are open.
+ */
+static void
+audio_output_allow_play_all(void)
+{
+	for (unsigned i = 0; i < num_audio_outputs; ++i)
+		audio_output_allow_play(audio_outputs[i]);
+}
+
+static void
+audio_output_reset_reopen(struct audio_output *ao)
+{
+	g_mutex_lock(ao->mutex);
+
+	if (!ao->open && ao->fail_timer != NULL) {
+		g_timer_destroy(ao->fail_timer);
+		ao->fail_timer = NULL;
+	}
+
+	g_mutex_unlock(ao->mutex);
+}
+
+/**
+ * Resets the "reopen" flag on all audio devices.  MPD should
+ * immediately retry to open the device instead of waiting for the
+ * timeout when the user wants to start playback.
+ */
+static void
+audio_output_all_reset_reopen(void)
+{
+	for (unsigned i = 0; i < num_audio_outputs; ++i) {
+		struct audio_output *ao = audio_outputs[i];
+
+		audio_output_reset_reopen(ao);
+	}
+}
+
+/**
+ * Opens all output devices which are enabled, but closed.
+ *
+ * @return true if there is at least open output device which is open
+ */
+static bool
+audio_output_all_update(void)
+{
+	unsigned int i;
+	bool ret = false;
+
+	if (!audio_format_defined(&input_audio_format))
+		return false;
+
+	for (i = 0; i < num_audio_outputs; ++i)
+		ret = audio_output_update(audio_outputs[i],
+					  &input_audio_format, g_mp) || ret;
+
+	return ret;
+}
+
+bool
+audio_output_all_play(struct music_chunk *chunk, GError **error_r)
+{
+	bool ret;
+	unsigned int i;
+
+	assert(g_music_buffer != NULL);
+	assert(g_mp != NULL);
+	assert(chunk != NULL);
+	assert(music_chunk_check_format(chunk, &input_audio_format));
+
+	ret = audio_output_all_update();
+	if (!ret) {
+		/* TODO: obtain real error */
+		g_set_error(error_r, output_quark(), 0,
+			    "Failed to open audio output");
+		return false;
+	}
+
+	music_pipe_push(g_mp, chunk);
+
+	for (i = 0; i < num_audio_outputs; ++i)
+		audio_output_play(audio_outputs[i]);
+
+	return true;
+}
+
+bool
+audio_output_all_open(const struct audio_format *audio_format,
+		      struct music_buffer *buffer,
+		      GError **error_r)
+{
+	bool ret = false, enabled = false;
+	unsigned int i;
+
+	assert(audio_format != NULL);
+	assert(buffer != NULL);
+	assert(g_music_buffer == NULL || g_music_buffer == buffer);
+	assert((g_mp == NULL) == (g_music_buffer == NULL));
+
+	g_music_buffer = buffer;
+
+	/* the audio format must be the same as existing chunks in the
+	   pipe */
+	assert(g_mp == NULL || music_pipe_check_format(g_mp, audio_format));
+
+	if (g_mp == NULL)
+		g_mp = music_pipe_new();
+	else
+		/* if the pipe hasn't been cleared, the the audio
+		   format must not have changed */
+		assert(music_pipe_empty(g_mp) ||
+		       audio_format_equals(audio_format,
+					   &input_audio_format));
+
+	input_audio_format = *audio_format;
+
+	audio_output_all_reset_reopen();
+	audio_output_all_enable_disable();
+	audio_output_all_update();
+
+	for (i = 0; i < num_audio_outputs; ++i) {
+		if (audio_outputs[i]->enabled)
+			enabled = true;
+
+		if (audio_outputs[i]->open)
+			ret = true;
+	}
+
+	if (!enabled)
+		g_set_error(error_r, output_quark(), 0,
+			    "All audio outputs are disabled");
+	else if (!ret)
+		/* TODO: obtain real error */
+		g_set_error(error_r, output_quark(), 0,
+			    "Failed to open audio output");
+
+	if (!ret)
+		/* close all devices if there was an error */
+		audio_output_all_close();
+
+	return ret;
+}
+
+/**
+ * Has the specified audio output already consumed this chunk?
+ */
+static bool
+chunk_is_consumed_in(const struct audio_output *ao,
+		     const struct music_chunk *chunk)
+{
+	if (!ao->open)
+		return true;
+
+	if (ao->chunk == NULL)
+		return false;
+
+	assert(chunk == ao->chunk || music_pipe_contains(g_mp, ao->chunk));
+
+	if (chunk != ao->chunk) {
+		assert(chunk->next != NULL);
+		return true;
+	}
+
+	return ao->chunk_finished && chunk->next == NULL;
+}
+
+/**
+ * Has this chunk been consumed by all audio outputs?
+ */
+static bool
+chunk_is_consumed(const struct music_chunk *chunk)
+{
+	for (unsigned i = 0; i < num_audio_outputs; ++i) {
+		const struct audio_output *ao = audio_outputs[i];
+		bool consumed;
+
+		g_mutex_lock(ao->mutex);
+		consumed = chunk_is_consumed_in(ao, chunk);
+		g_mutex_unlock(ao->mutex);
+
+		if (!consumed)
+			return false;
+	}
+
+	return true;
+}
+
+/**
+ * There's only one chunk left in the pipe (#g_mp), and all audio
+ * outputs have consumed it already.  Clear the reference.
+ */
+static void
+clear_tail_chunk(G_GNUC_UNUSED const struct music_chunk *chunk, bool *locked)
+{
+	assert(chunk->next == NULL);
+	assert(music_pipe_contains(g_mp, chunk));
+
+	for (unsigned i = 0; i < num_audio_outputs; ++i) {
+		struct audio_output *ao = audio_outputs[i];
+
+		/* this mutex will be unlocked by the caller when it's
+		   ready */
+		g_mutex_lock(ao->mutex);
+		locked[i] = ao->open;
+
+		if (!locked[i]) {
+			g_mutex_unlock(ao->mutex);
+			continue;
+		}
+
+		assert(ao->chunk == chunk);
+		assert(ao->chunk_finished);
+		ao->chunk = NULL;
+	}
+}
+
+unsigned
+audio_output_all_check(void)
+{
+	const struct music_chunk *chunk;
+	bool is_tail;
+	struct music_chunk *shifted;
+	bool locked[num_audio_outputs];
+
+	assert(g_music_buffer != NULL);
+	assert(g_mp != NULL);
+
+	while ((chunk = music_pipe_peek(g_mp)) != NULL) {
+		assert(!music_pipe_empty(g_mp));
+
+		if (!chunk_is_consumed(chunk))
+			/* at least one output is not finished playing
+			   this chunk */
+			return music_pipe_size(g_mp);
+
+		if (chunk->length > 0 && chunk->times >= 0.0)
+			/* only update elapsed_time if the chunk
+			   provides a defined value */
+			audio_output_all_elapsed_time = chunk->times;
+
+		is_tail = chunk->next == NULL;
+		if (is_tail)
+			/* this is the tail of the pipe - clear the
+			   chunk reference in all outputs */
+			clear_tail_chunk(chunk, locked);
+
+		/* remove the chunk from the pipe */
+		shifted = music_pipe_shift(g_mp);
+		assert(shifted == chunk);
+
+		if (is_tail)
+			/* unlock all audio outputs which were locked
+			   by clear_tail_chunk() */
+			for (unsigned i = 0; i < num_audio_outputs; ++i)
+				if (locked[i])
+					g_mutex_unlock(audio_outputs[i]->mutex);
+
+		/* return the chunk to the buffer */
+		music_buffer_return(g_music_buffer, shifted);
+	}
+
+	return 0;
+}
+
+bool
+audio_output_all_wait(struct player_control *pc, unsigned threshold)
+{
+	player_lock(pc);
+
+	if (audio_output_all_check() < threshold) {
+		player_unlock(pc);
+		return true;
+	}
+
+	player_wait(pc);
+	player_unlock(pc);
+
+	return audio_output_all_check() < threshold;
+}
+
+void
+audio_output_all_pause(void)
+{
+	unsigned int i;
+
+	audio_output_all_update();
+
+	for (i = 0; i < num_audio_outputs; ++i)
+		audio_output_pause(audio_outputs[i]);
+
+	audio_output_wait_all();
+}
+
+void
+audio_output_all_drain(void)
+{
+	for (unsigned i = 0; i < num_audio_outputs; ++i)
+		audio_output_drain_async(audio_outputs[i]);
+
+	audio_output_wait_all();
+}
+
+void
+audio_output_all_cancel(void)
+{
+	unsigned int i;
+
+	/* send the cancel() command to all audio outputs */
+
+	for (i = 0; i < num_audio_outputs; ++i)
+		audio_output_cancel(audio_outputs[i]);
+
+	audio_output_wait_all();
+
+	/* clear the music pipe and return all chunks to the buffer */
+
+	if (g_mp != NULL)
+		music_pipe_clear(g_mp, g_music_buffer);
+
+	/* the audio outputs are now waiting for a signal, to
+	   synchronize the cleared music pipe */
+
+	audio_output_allow_play_all();
+
+	/* invalidate elapsed_time */
+
+	audio_output_all_elapsed_time = -1.0;
+}
+
+void
+audio_output_all_close(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_audio_outputs; ++i)
+		audio_output_close(audio_outputs[i]);
+
+	if (g_mp != NULL) {
+		assert(g_music_buffer != NULL);
+
+		music_pipe_clear(g_mp, g_music_buffer);
+		music_pipe_free(g_mp);
+		g_mp = NULL;
+	}
+
+	g_music_buffer = NULL;
+
+	audio_format_clear(&input_audio_format);
+
+	audio_output_all_elapsed_time = -1.0;
+}
+
+void
+audio_output_all_release(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_audio_outputs; ++i)
+		audio_output_release(audio_outputs[i]);
+
+	if (g_mp != NULL) {
+		assert(g_music_buffer != NULL);
+
+		music_pipe_clear(g_mp, g_music_buffer);
+		music_pipe_free(g_mp);
+		g_mp = NULL;
+	}
+
+	g_music_buffer = NULL;
+
+	audio_format_clear(&input_audio_format);
+
+	audio_output_all_elapsed_time = -1.0;
+}
+
+void
+audio_output_all_song_border(void)
+{
+	/* clear the elapsed_time pointer at the beginning of a new
+	   song */
+	audio_output_all_elapsed_time = 0.0;
+}
+
+float
+audio_output_all_get_elapsed_time(void)
+{
+	return audio_output_all_elapsed_time;
+}