decoder/vorbis: convert to C++

src/decoder/VorbisDecoderPlugin.cxx

@@ -0,0 +1,362 @@
+/*
+ * 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 "VorbisDecoderPlugin.h"
+#include "VorbisComments.hxx"
+#include "decoder_api.h"
+
+extern "C" {
+#include "ogg_codec.h"
+#include "audio_check.h"
+#include "uri.h"
+}
+
+#include "tag_handler.h"
+
+#ifndef HAVE_TREMOR
+#define OV_EXCLUDE_STATIC_CALLBACKS
+#include <vorbis/vorbisfile.h>
+#else
+#include <tremor/ivorbisfile.h>
+/* Macros to make Tremor's API look like libogg. Tremor always
+   returns host-byte-order 16-bit signed data, and uses integer
+   milliseconds where libogg uses double seconds.
+*/
+#define ov_read(VF, BUFFER, LENGTH, BIGENDIANP, WORD, SGNED, BITSTREAM) \
+        ov_read(VF, BUFFER, LENGTH, BITSTREAM)
+#define ov_time_total(VF, I) ((double)ov_time_total(VF, I)/1000)
+#define ov_time_tell(VF) ((double)ov_time_tell(VF)/1000)
+#define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
+#endif /* HAVE_TREMOR */
+
+#include <glib.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <unistd.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "vorbis"
+
+#if G_BYTE_ORDER == G_BIG_ENDIAN
+#define VORBIS_BIG_ENDIAN true
+#else
+#define VORBIS_BIG_ENDIAN false
+#endif
+
+struct vorbis_input_stream {
+	struct decoder *decoder;
+
+	struct input_stream *input_stream;
+	bool seekable;
+};
+
+static size_t ogg_read_cb(void *ptr, size_t size, size_t nmemb, void *data)
+{
+	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
+	size_t ret = decoder_read(vis->decoder, vis->input_stream,
+				  ptr, size * nmemb);
+
+	errno = 0;
+
+	return ret / size;
+}
+
+static int ogg_seek_cb(void *data, ogg_int64_t offset, int whence)
+{
+	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
+
+	return vis->seekable &&
+		(!vis->decoder || decoder_get_command(vis->decoder) != DECODE_COMMAND_STOP) &&
+		input_stream_lock_seek(vis->input_stream, offset, whence, NULL)
+		? 0 : -1;
+}
+
+/* TODO: check Ogg libraries API and see if we can just not have this func */
+static int ogg_close_cb(G_GNUC_UNUSED void *data)
+{
+	return 0;
+}
+
+static long ogg_tell_cb(void *data)
+{
+	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
+
+	return (long)vis->input_stream->offset;
+}
+
+static const ov_callbacks vorbis_is_callbacks = {
+	ogg_read_cb,
+	ogg_seek_cb,
+	ogg_close_cb,
+	ogg_tell_cb,
+};
+
+static const char *
+vorbis_strerror(int code)
+{
+	switch (code) {
+	case OV_EREAD:
+		return "read error";
+
+	case OV_ENOTVORBIS:
+		return "not vorbis stream";
+
+	case OV_EVERSION:
+		return "vorbis version mismatch";
+
+	case OV_EBADHEADER:
+		return "invalid vorbis header";
+
+	case OV_EFAULT:
+		return "internal logic error";
+
+	default:
+		return "unknown error";
+	}
+}
+
+static bool
+vorbis_is_open(struct vorbis_input_stream *vis, OggVorbis_File *vf,
+	       struct decoder *decoder, struct input_stream *input_stream)
+{
+	vis->decoder = decoder;
+	vis->input_stream = input_stream;
+	vis->seekable = input_stream->seekable &&
+		(input_stream->uri == NULL ||
+		 !uri_has_scheme(input_stream->uri));
+
+	int ret = ov_open_callbacks(vis, vf, NULL, 0, vorbis_is_callbacks);
+	if (ret < 0) {
+		if (decoder == NULL ||
+		    decoder_get_command(decoder) == DECODE_COMMAND_NONE)
+			g_warning("Failed to open Ogg Vorbis stream: %s",
+				  vorbis_strerror(ret));
+		return false;
+	}
+
+	return true;
+}
+
+static void
+vorbis_send_comments(struct decoder *decoder, struct input_stream *is,
+		     char **comments)
+{
+	struct tag *tag = vorbis_comments_to_tag(comments);
+	if (!tag)
+		return;
+
+	decoder_tag(decoder, is, tag);
+	tag_free(tag);
+}
+
+#ifndef HAVE_TREMOR
+static void
+vorbis_interleave(float *dest, const float *const*src,
+		  unsigned nframes, unsigned channels)
+{
+	for (const float *const*src_end = src + channels;
+	     src != src_end; ++src, ++dest) {
+		float *d = dest;
+		for (const float *s = *src, *s_end = s + nframes;
+		     s != s_end; ++s, d += channels)
+			*d = *s;
+	}
+}
+#endif
+
+/* public */
+static void
+vorbis_stream_decode(struct decoder *decoder,
+		     struct input_stream *input_stream)
+{
+	GError *error = NULL;
+
+	if (ogg_codec_detect(decoder, input_stream) != OGG_CODEC_VORBIS)
+		return;
+
+	/* rewind the stream, because ogg_codec_detect() has
+	   moved it */
+	input_stream_lock_seek(input_stream, 0, SEEK_SET, NULL);
+
+	struct vorbis_input_stream vis;
+	OggVorbis_File vf;
+	if (!vorbis_is_open(&vis, &vf, decoder, input_stream))
+		return;
+
+	const vorbis_info *vi = ov_info(&vf, -1);
+	if (vi == NULL) {
+		g_warning("ov_info() has failed");
+		return;
+	}
+
+	struct audio_format audio_format;
+	if (!audio_format_init_checked(&audio_format, vi->rate,
+#ifdef HAVE_TREMOR
+				       SAMPLE_FORMAT_S16,
+#else
+				       SAMPLE_FORMAT_FLOAT,
+#endif
+				       vi->channels, &error)) {
+		g_warning("%s", error->message);
+		g_error_free(error);
+		return;
+	}
+
+	float total_time = ov_time_total(&vf, -1);
+	if (total_time < 0)
+		total_time = 0;
+
+	decoder_initialized(decoder, &audio_format, vis.seekable, total_time);
+
+	enum decoder_command cmd = decoder_get_command(decoder);
+
+#ifdef HAVE_TREMOR
+	char buffer[4096];
+#else
+	float buffer[2048];
+	const int frames_per_buffer =
+		G_N_ELEMENTS(buffer) / audio_format.channels;
+	const unsigned frame_size = sizeof(buffer[0]) * audio_format.channels;
+#endif
+
+	int prev_section = -1;
+	unsigned kbit_rate = 0;
+
+	do {
+		if (cmd == DECODE_COMMAND_SEEK) {
+			double seek_where = decoder_seek_where(decoder);
+			if (0 == ov_time_seek_page(&vf, seek_where)) {
+				decoder_command_finished(decoder);
+			} else
+				decoder_seek_error(decoder);
+		}
+
+		int current_section;
+
+#ifdef HAVE_TREMOR
+		long nbytes = ov_read(&vf, buffer, sizeof(buffer),
+				      VORBIS_BIG_ENDIAN, 2, 1,
+				      &current_section);
+#else
+		float **per_channel;
+		long nframes = ov_read_float(&vf, &per_channel,
+					     frames_per_buffer,
+					     &current_section);
+		long nbytes = nframes;
+		if (nframes > 0) {
+			vorbis_interleave(buffer,
+					  (const float*const*)per_channel,
+					  nframes, audio_format.channels);
+			nbytes *= frame_size;
+		}
+#endif
+
+		if (nbytes == OV_HOLE) /* bad packet */
+			nbytes = 0;
+		else if (nbytes <= 0)
+			/* break on EOF or other error */
+			break;
+
+		if (current_section != prev_section) {
+			vi = ov_info(&vf, -1);
+			if (vi == NULL) {
+				g_warning("ov_info() has failed");
+				break;
+			}
+
+			if (vi->rate != (long)audio_format.sample_rate ||
+			    vi->channels != (int)audio_format.channels) {
+				/* we don't support audio format
+				   change yet */
+				g_warning("audio format change, stopping here");
+				break;
+			}
+
+			char **comments = ov_comment(&vf, -1)->user_comments;
+			vorbis_send_comments(decoder, input_stream, comments);
+
+			struct replay_gain_info rgi;
+			if (vorbis_comments_to_replay_gain(&rgi, comments))
+				decoder_replay_gain(decoder, &rgi);
+
+			prev_section = current_section;
+		}
+
+		long test = ov_bitrate_instant(&vf);
+		if (test > 0)
+			kbit_rate = test / 1000;
+
+		cmd = decoder_data(decoder, input_stream,
+				   buffer, nbytes,
+				   kbit_rate);
+	} while (cmd != DECODE_COMMAND_STOP);
+
+	ov_clear(&vf);
+}
+
+static bool
+vorbis_scan_stream(struct input_stream *is,
+		   const struct tag_handler *handler, void *handler_ctx)
+{
+	struct vorbis_input_stream vis;
+	OggVorbis_File vf;
+
+	if (!vorbis_is_open(&vis, &vf, NULL, is))
+		return false;
+
+	tag_handler_invoke_duration(handler, handler_ctx,
+				    (int)(ov_time_total(&vf, -1) + 0.5));
+
+	vorbis_comments_scan(ov_comment(&vf, -1)->user_comments,
+			     handler, handler_ctx);
+
+	ov_clear(&vf);
+	return true;
+}
+
+static const char *const vorbis_suffixes[] = {
+	"ogg", "oga", NULL
+};
+
+static const char *const vorbis_mime_types[] = {
+	"application/ogg",
+	"application/x-ogg",
+	"audio/ogg",
+	"audio/vorbis",
+	"audio/vorbis+ogg",
+	"audio/x-ogg",
+	"audio/x-vorbis",
+	"audio/x-vorbis+ogg",
+	NULL
+};
+
+const struct decoder_plugin vorbis_decoder_plugin = {
+	"vorbis",
+	nullptr,
+	nullptr,
+	vorbis_stream_decode,
+	nullptr,
+	nullptr,
+	vorbis_scan_stream,
+	nullptr,
+	vorbis_suffixes,
+	vorbis_mime_types
+};