decoder_*: convert to C++

1 files changed, 569 insertions, 0 deletions

diff --git a/src/DecoderAPI.cxx b/src/DecoderAPI.cxx
new file mode 100644
index 00000000..738e7184
--- /dev/null
+++ b/src/DecoderAPI.cxx
@@ -0,0 +1,569 @@
+/*
+ * Copyright (C) 2003-2013 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 "decoder_api.h"
+#include "audio_config.h"
+#include "buffer.h"
+#include "pipe.h"
+#include "chunk.h"
+#include "replay_gain_config.h"
+}
+
+#include "DecoderControl.hxx"
+#include "DecoderInternal.hxx"
+#include "song.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "decoder"
+
+void
+decoder_initialized(struct decoder *decoder,
+		    const struct audio_format *audio_format,
+		    bool seekable, float total_time)
+{
+	struct decoder_control *dc = decoder->dc;
+	struct audio_format_string af_string;
+
+	assert(dc->state == DECODE_STATE_START);
+	assert(dc->pipe != NULL);
+	assert(decoder != NULL);
+	assert(decoder->stream_tag == NULL);
+	assert(decoder->decoder_tag == NULL);
+	assert(!decoder->seeking);
+	assert(audio_format != NULL);
+	assert(audio_format_defined(audio_format));
+	assert(audio_format_valid(audio_format));
+
+	dc->in_audio_format = *audio_format;
+	getOutputAudioFormat(audio_format, &dc->out_audio_format);
+
+	dc->seekable = seekable;
+	dc->total_time = total_time;
+
+	decoder_lock(dc);
+	dc->state = DECODE_STATE_DECODE;
+	g_cond_signal(dc->client_cond);
+	decoder_unlock(dc);
+
+	g_debug("audio_format=%s, seekable=%s",
+		audio_format_to_string(&dc->in_audio_format, &af_string),
+		seekable ? "true" : "false");
+
+	if (!audio_format_equals(&dc->in_audio_format,
+				 &dc->out_audio_format))
+		g_debug("converting to %s",
+			audio_format_to_string(&dc->out_audio_format,
+					       &af_string));
+}
+
+/**
+ * Checks if we need an "initial seek".  If so, then the initial seek
+ * is prepared, and the function returns true.
+ */
+G_GNUC_PURE
+static bool
+decoder_prepare_initial_seek(struct decoder *decoder)
+{
+	const struct decoder_control *dc = decoder->dc;
+	assert(dc->pipe != NULL);
+
+	if (dc->state != DECODE_STATE_DECODE)
+		/* wait until the decoder has finished initialisation
+		   (reading file headers etc.) before emitting the
+		   virtual "SEEK" command */
+		return false;
+
+	if (decoder->initial_seek_running)
+		/* initial seek has already begun - override any other
+		   command */
+		return true;
+
+	if (decoder->initial_seek_pending) {
+		if (!dc->seekable) {
+			/* seeking is not possible */
+			decoder->initial_seek_pending = false;
+			return false;
+		}
+
+		if (dc->command == DECODE_COMMAND_NONE) {
+			/* begin initial seek */
+
+			decoder->initial_seek_pending = false;
+			decoder->initial_seek_running = true;
+			return true;
+		}
+
+		/* skip initial seek when there's another command
+		   (e.g. STOP) */
+
+		decoder->initial_seek_pending = false;
+	}
+
+	return false;
+}
+
+/**
+ * Returns the current decoder command.  May return a "virtual"
+ * synthesized command, e.g. to seek to the beginning of the CUE
+ * track.
+ */
+G_GNUC_PURE
+static enum decoder_command
+decoder_get_virtual_command(struct decoder *decoder)
+{
+	const struct decoder_control *dc = decoder->dc;
+	assert(dc->pipe != NULL);
+
+	if (decoder_prepare_initial_seek(decoder))
+		return DECODE_COMMAND_SEEK;
+
+	return dc->command;
+}
+
+enum decoder_command
+decoder_get_command(struct decoder *decoder)
+{
+	return decoder_get_virtual_command(decoder);
+}
+
+void
+decoder_command_finished(struct decoder *decoder)
+{
+	struct decoder_control *dc = decoder->dc;
+
+	decoder_lock(dc);
+
+	assert(dc->command != DECODE_COMMAND_NONE ||
+	       decoder->initial_seek_running);
+	assert(dc->command != DECODE_COMMAND_SEEK ||
+	       decoder->initial_seek_running ||
+	       dc->seek_error || decoder->seeking);
+	assert(dc->pipe != NULL);
+
+	if (decoder->initial_seek_running) {
+		assert(!decoder->seeking);
+		assert(decoder->chunk == NULL);
+		assert(music_pipe_empty(dc->pipe));
+
+		decoder->initial_seek_running = false;
+		decoder->timestamp = dc->start_ms / 1000.;
+		decoder_unlock(dc);
+		return;
+	}
+
+	if (decoder->seeking) {
+		decoder->seeking = false;
+
+		/* delete frames from the old song position */
+
+		if (decoder->chunk != NULL) {
+			music_buffer_return(dc->buffer, decoder->chunk);
+			decoder->chunk = NULL;
+		}
+
+		music_pipe_clear(dc->pipe, dc->buffer);
+
+		decoder->timestamp = dc->seek_where;
+	}
+
+	dc->command = DECODE_COMMAND_NONE;
+	g_cond_signal(dc->client_cond);
+	decoder_unlock(dc);
+}
+
+double decoder_seek_where(G_GNUC_UNUSED struct decoder * decoder)
+{
+	const struct decoder_control *dc = decoder->dc;
+
+	assert(dc->pipe != NULL);
+
+	if (decoder->initial_seek_running)
+		return dc->start_ms / 1000.;
+
+	assert(dc->command == DECODE_COMMAND_SEEK);
+
+	decoder->seeking = true;
+
+	return dc->seek_where;
+}
+
+void decoder_seek_error(struct decoder * decoder)
+{
+	struct decoder_control *dc = decoder->dc;
+
+	assert(dc->pipe != NULL);
+
+	if (decoder->initial_seek_running) {
+		/* d'oh, we can't seek to the sub-song start position,
+		   what now? - no idea, ignoring the problem for now. */
+		decoder->initial_seek_running = false;
+		return;
+	}
+
+	assert(dc->command == DECODE_COMMAND_SEEK);
+
+	dc->seek_error = true;
+	decoder->seeking = false;
+
+	decoder_command_finished(decoder);
+}
+
+/**
+ * Should be read operation be cancelled?  That is the case when the
+ * player thread has sent a command such as "STOP".
+ */
+G_GNUC_PURE
+static inline bool
+decoder_check_cancel_read(const struct decoder *decoder)
+{
+	if (decoder == NULL)
+		return false;
+
+	const struct decoder_control *dc = decoder->dc;
+	if (dc->command == DECODE_COMMAND_NONE)
+		return false;
+
+	/* ignore the SEEK command during initialization, the plugin
+	   should handle that after it has initialized successfully */
+	if (dc->command == DECODE_COMMAND_SEEK &&
+	    (dc->state == DECODE_STATE_START || decoder->seeking))
+		return false;
+
+	return true;
+}
+
+size_t decoder_read(struct decoder *decoder,
+		    struct input_stream *is,
+		    void *buffer, size_t length)
+{
+	/* XXX don't allow decoder==NULL */
+	GError *error = NULL;
+	size_t nbytes;
+
+	assert(decoder == NULL ||
+	       decoder->dc->state == DECODE_STATE_START ||
+	       decoder->dc->state == DECODE_STATE_DECODE);
+	assert(is != NULL);
+	assert(buffer != NULL);
+
+	if (length == 0)
+		return 0;
+
+	input_stream_lock(is);
+
+	while (true) {
+		if (decoder_check_cancel_read(decoder)) {
+			input_stream_unlock(is);
+			return 0;
+		}
+
+		if (input_stream_available(is))
+			break;
+
+		g_cond_wait(is->cond, is->mutex);
+	}
+
+	nbytes = input_stream_read(is, buffer, length, &error);
+	assert(nbytes == 0 || error == NULL);
+	assert(nbytes > 0 || error != NULL || input_stream_eof(is));
+
+	if (G_UNLIKELY(nbytes == 0 && error != NULL)) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+	}
+
+	input_stream_unlock(is);
+
+	return nbytes;
+}
+
+void
+decoder_timestamp(struct decoder *decoder, double t)
+{
+	assert(decoder != NULL);
+	assert(t >= 0);
+
+	decoder->timestamp = t;
+}
+
+/**
+ * Sends a #tag as-is to the music pipe.  Flushes the current chunk
+ * (decoder.chunk) if there is one.
+ */
+static enum decoder_command
+do_send_tag(struct decoder *decoder, const struct tag *tag)
+{
+	struct music_chunk *chunk;
+
+	if (decoder->chunk != NULL) {
+		/* there is a partial chunk - flush it, we want the
+		   tag in a new chunk */
+		decoder_flush_chunk(decoder);
+		g_cond_signal(decoder->dc->client_cond);
+	}
+
+	assert(decoder->chunk == NULL);
+
+	chunk = decoder_get_chunk(decoder);
+	if (chunk == NULL) {
+		assert(decoder->dc->command != DECODE_COMMAND_NONE);
+		return decoder->dc->command;
+	}
+
+	chunk->tag = tag_dup(tag);
+	return DECODE_COMMAND_NONE;
+}
+
+static bool
+update_stream_tag(struct decoder *decoder, struct input_stream *is)
+{
+	struct tag *tag;
+
+	tag = is != NULL
+		? input_stream_lock_tag(is)
+		: NULL;
+	if (tag == NULL) {
+		tag = decoder->song_tag;
+		if (tag == NULL)
+			return false;
+
+		/* no stream tag present - submit the song tag
+		   instead */
+		decoder->song_tag = NULL;
+	}
+
+	if (decoder->stream_tag != NULL)
+		tag_free(decoder->stream_tag);
+
+	decoder->stream_tag = tag;
+	return true;
+}
+
+enum decoder_command
+decoder_data(struct decoder *decoder,
+	     struct input_stream *is,
+	     const void *data, size_t length,
+	     uint16_t kbit_rate)
+{
+	struct decoder_control *dc = decoder->dc;
+	GError *error = NULL;
+	enum decoder_command cmd;
+
+	assert(dc->state == DECODE_STATE_DECODE);
+	assert(dc->pipe != NULL);
+	assert(length % audio_format_frame_size(&dc->in_audio_format) == 0);
+
+	decoder_lock(dc);
+	cmd = decoder_get_virtual_command(decoder);
+	decoder_unlock(dc);
+
+	if (cmd == DECODE_COMMAND_STOP || cmd == DECODE_COMMAND_SEEK ||
+	    length == 0)
+		return cmd;
+
+	/* send stream tags */
+
+	if (update_stream_tag(decoder, is)) {
+		if (decoder->decoder_tag != NULL) {
+			/* merge with tag from decoder plugin */
+			struct tag *tag;
+
+			tag = tag_merge(decoder->decoder_tag,
+					decoder->stream_tag);
+			cmd = do_send_tag(decoder, tag);
+			tag_free(tag);
+		} else
+			/* send only the stream tag */
+			cmd = do_send_tag(decoder, decoder->stream_tag);
+
+		if (cmd != DECODE_COMMAND_NONE)
+			return cmd;
+	}
+
+	if (!audio_format_equals(&dc->in_audio_format, &dc->out_audio_format)) {
+		data = pcm_convert(&decoder->conv_state,
+				   &dc->in_audio_format, data, length,
+				   &dc->out_audio_format, &length,
+				   &error);
+		if (data == NULL) {
+			/* the PCM conversion has failed - stop
+			   playback, since we have no better way to
+			   bail out */
+			g_warning("%s", error->message);
+			return DECODE_COMMAND_STOP;
+		}
+	}
+
+	while (length > 0) {
+		struct music_chunk *chunk;
+		size_t nbytes;
+		bool full;
+
+		chunk = decoder_get_chunk(decoder);
+		if (chunk == NULL) {
+			assert(dc->command != DECODE_COMMAND_NONE);
+			return dc->command;
+		}
+
+		void *dest = music_chunk_write(chunk, &dc->out_audio_format,
+					       decoder->timestamp -
+					       dc->song->start_ms / 1000.0,
+					       kbit_rate, &nbytes);
+		if (dest == NULL) {
+			/* the chunk is full, flush it */
+			decoder_flush_chunk(decoder);
+			g_cond_signal(dc->client_cond);
+			continue;
+		}
+
+		assert(nbytes > 0);
+
+		if (nbytes > length)
+			nbytes = length;
+
+		/* copy the buffer */
+
+		memcpy(dest, data, nbytes);
+
+		/* expand the music pipe chunk */
+
+		full = music_chunk_expand(chunk, &dc->out_audio_format, nbytes);
+		if (full) {
+			/* the chunk is full, flush it */
+			decoder_flush_chunk(decoder);
+			g_cond_signal(dc->client_cond);
+		}
+
+		data = (const uint8_t *)data + nbytes;
+		length -= nbytes;
+
+		decoder->timestamp += (double)nbytes /
+			audio_format_time_to_size(&dc->out_audio_format);
+
+		if (dc->end_ms > 0 &&
+		    decoder->timestamp >= dc->end_ms / 1000.0)
+			/* the end of this range has been reached:
+			   stop decoding */
+			return DECODE_COMMAND_STOP;
+	}
+
+	return DECODE_COMMAND_NONE;
+}
+
+enum decoder_command
+decoder_tag(G_GNUC_UNUSED struct decoder *decoder, struct input_stream *is,
+	    const struct tag *tag)
+{
+	G_GNUC_UNUSED const struct decoder_control *dc = decoder->dc;
+	enum decoder_command cmd;
+
+	assert(dc->state == DECODE_STATE_DECODE);
+	assert(dc->pipe != NULL);
+	assert(tag != NULL);
+
+	/* save the tag */
+
+	if (decoder->decoder_tag != NULL)
+		tag_free(decoder->decoder_tag);
+	decoder->decoder_tag = tag_dup(tag);
+
+	/* check for a new stream tag */
+
+	update_stream_tag(decoder, is);
+
+	/* check if we're seeking */
+
+	if (decoder_prepare_initial_seek(decoder))
+		/* during initial seek, no music chunk must be created
+		   until seeking is finished; skip the rest of the
+		   function here */
+		return DECODE_COMMAND_SEEK;
+
+	/* send tag to music pipe */
+
+	if (decoder->stream_tag != NULL) {
+		/* merge with tag from input stream */
+		struct tag *merged;
+
+		merged = tag_merge(decoder->stream_tag, decoder->decoder_tag);
+		cmd = do_send_tag(decoder, merged);
+		tag_free(merged);
+	} else
+		/* send only the decoder tag */
+		cmd = do_send_tag(decoder, tag);
+
+	return cmd;
+}
+
+float
+decoder_replay_gain(struct decoder *decoder,
+		    const struct replay_gain_info *replay_gain_info)
+{
+	float return_db = 0;
+	assert(decoder != NULL);
+
+	if (replay_gain_info != NULL) {
+		static unsigned serial;
+		if (++serial == 0)
+			serial = 1;
+
+		if (REPLAY_GAIN_OFF != replay_gain_mode) {
+			return_db = 20.0 * log10f(
+				replay_gain_tuple_scale(
+					&replay_gain_info->tuples[replay_gain_get_real_mode()],
+					replay_gain_preamp, replay_gain_missing_preamp,
+					replay_gain_limit));
+		}
+
+		decoder->replay_gain_info = *replay_gain_info;
+		decoder->replay_gain_serial = serial;
+
+		if (decoder->chunk != NULL) {
+			/* flush the current chunk because the new
+			   replay gain values affect the following
+			   samples */
+			decoder_flush_chunk(decoder);
+			g_cond_signal(decoder->dc->client_cond);
+		}
+	} else
+		decoder->replay_gain_serial = 0;
+
+	return return_db;
+}
+
+void
+decoder_mixramp(struct decoder *decoder, float replay_gain_db,
+		char *mixramp_start, char *mixramp_end)
+{
+	assert(decoder != NULL);
+	struct decoder_control *dc = decoder->dc;
+	assert(dc != NULL);
+
+	dc->replay_gain_db = replay_gain_db;
+	dc_mixramp_start(dc, mixramp_start);
+	dc_mixramp_end(dc, mixramp_end);
+}