encoder/{vorbis,opus}: merge code to new class OggStream

3 files changed, 154 insertions, 89 deletions

diff --git a/src/encoder/OggStream.hxx b/src/encoder/OggStream.hxx
new file mode 100644
index 00000000..ce847f49
--- /dev/null
+++ b/src/encoder/OggStream.hxx
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2003-2012 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.
+ */
+
+#ifndef MPD_OGG_STREAM_HXX
+#define MPD_OGG_STREAM_HXX
+
+#include "check.h"
+
+#include <ogg/ogg.h>
+
+#include <assert.h>
+#include <string.h>
+#include <stdint.h>
+
+class OggStream {
+	ogg_stream_state state;
+
+	bool flush;
+
+#ifndef NDEBUG
+	bool initialized;
+#endif
+
+public:
+#ifndef NDEBUG
+	OggStream():initialized(false) {}
+	~OggStream() {
+		assert(!initialized);
+	}
+#endif
+
+	void Initialize(int serialno) {
+		assert(!initialized);
+
+		ogg_stream_init(&state, serialno);
+
+		/* set "flush" to true, so the caller gets the full
+		   headers on the first read() */
+		flush = true;
+
+#ifndef NDEBUG
+		initialized = true;
+#endif
+	}
+
+	void Reinitialize(int serialno) {
+		assert(initialized);
+
+		ogg_stream_reset_serialno(&state, serialno);
+
+		/* set "flush" to true, so the caller gets the full
+		   headers on the first read() */
+		flush = true;
+	}
+
+	void Deinitialize() {
+		assert(initialized);
+
+		ogg_stream_clear(&state);
+
+#ifndef NDEBUG
+		initialized = false;
+#endif
+	}
+
+	void Flush() {
+		assert(initialized);
+
+		flush = true;
+	}
+
+	void PacketIn(const ogg_packet &packet) {
+		assert(initialized);
+
+		ogg_stream_packetin(&state,
+				    const_cast<ogg_packet *>(&packet));
+	}
+
+	bool PageOut(ogg_page &page) {
+		int result = ogg_stream_pageout(&state, &page);
+		if (result == 0 && flush) {
+			flush = false;
+			result = ogg_stream_flush(&state, &page);
+		}
+
+		return result != 0;
+	}
+
+	size_t PageOut(void *_buffer, size_t size) {
+		ogg_page page;
+		if (!PageOut(page))
+			return 0;
+
+		assert(page.header_len > 0 || page.body_len > 0);
+
+		size_t header_len = (size_t)page.header_len;
+		size_t body_len = (size_t)page.body_len;
+		assert(header_len <= size);
+
+		if (header_len + body_len > size)
+			/* TODO: better overflow handling */
+			body_len = size - header_len;
+
+		uint8_t *buffer = (uint8_t *)_buffer;
+		memcpy(buffer, page.header, header_len);
+		memcpy(buffer + header_len, page.body, body_len);
+
+		return header_len + body_len;
+	}
+};
+
+#endif
diff --git a/src/encoder/OpusEncoderPlugin.cxx b/src/encoder/OpusEncoderPlugin.cxx
index 4a51dabb..c28e7ff0 100644
--- a/src/encoder/OpusEncoderPlugin.cxx
+++ b/src/encoder/OpusEncoderPlugin.cxx
@@ -19,6 +19,7 @@
 
 #include "config.h"
 #include "OpusEncoderPlugin.hxx"
+#include "OggStream.hxx"
 
 extern "C" {
 #include "encoder_api.h"
@@ -59,11 +60,9 @@ struct opus_encoder {
 
 	unsigned char buffer2[1275 * 3 + 7];
 
-	ogg_stream_state os;
+	OggStream stream;
 
 	ogg_int64_t packetno;
-
-	bool flush;
 };
 
 gcc_const
@@ -196,13 +195,9 @@ opus_encoder_open(struct encoder *_encoder,
 	encoder->buffer_position = 0;
 	encoder->buffer = (unsigned char *)g_malloc(encoder->buffer_size);
 
-	ogg_stream_init(&encoder->os, g_random_int());
+	encoder->stream.Initialize(g_random_int());
 	encoder->packetno = 0;
 
-	/* set "flush" to true, so the caller gets the full headers on
-	   the first read() */
-	encoder->flush = true;
-
 	return true;
 }
 
@@ -211,7 +206,7 @@ opus_encoder_close(struct encoder *_encoder)
 {
 	struct opus_encoder *encoder = (struct opus_encoder *)_encoder;
 
-	ogg_stream_clear(&encoder->os);
+	encoder->stream.Deinitialize();
 	g_free(encoder->buffer);
 	opus_encoder_destroy(encoder->enc);
 }
@@ -247,7 +242,7 @@ opus_encoder_do_encode(struct opus_encoder *encoder, bool eos,
 	packet.e_o_s = eos;
 	packet.granulepos = 0; // TODO
 	packet.packetno = encoder->packetno++;
-	ogg_stream_packetin(&encoder->os, &packet);
+	encoder->stream.PacketIn(packet);
 
 	encoder->buffer_position = 0;
 
@@ -259,7 +254,7 @@ opus_encoder_end(struct encoder *_encoder, GError **error_r)
 {
 	struct opus_encoder *encoder = (struct opus_encoder *)_encoder;
 
-	encoder->flush = true;
+	encoder->stream.Flush();
 
 	memset(encoder->buffer + encoder->buffer_position, 0,
 	       encoder->buffer_size - encoder->buffer_position);
@@ -273,7 +268,7 @@ opus_encoder_flush(struct encoder *_encoder, G_GNUC_UNUSED GError **error)
 {
 	struct opus_encoder *encoder = (struct opus_encoder *)_encoder;
 
-	encoder->flush = true;
+	encoder->stream.Flush();
 	return true;
 }
 
@@ -327,9 +322,8 @@ opus_encoder_generate_head(struct opus_encoder *encoder)
 	packet.e_o_s = false;
 	packet.granulepos = 0;
 	packet.packetno = encoder->packetno++;
-	ogg_stream_packetin(&encoder->os, &packet);
-
-	encoder->flush = true;
+	encoder->stream.PacketIn(packet);
+	encoder->stream.Flush();
 }
 
 static void
@@ -352,47 +346,23 @@ opus_encoder_generate_tags(struct opus_encoder *encoder)
 	packet.e_o_s = false;
 	packet.granulepos = 0;
 	packet.packetno = encoder->packetno++;
-	ogg_stream_packetin(&encoder->os, &packet);
+	encoder->stream.PacketIn(packet);
+	encoder->stream.Flush();
 
 	g_free(comments);
-
-	encoder->flush = true;
 }
 
 static size_t
-opus_encoder_read(struct encoder *_encoder, void *_dest, size_t length)
+opus_encoder_read(struct encoder *_encoder, void *dest, size_t length)
 {
 	struct opus_encoder *encoder = (struct opus_encoder *)_encoder;
-	unsigned char *dest = (unsigned char *)_dest;
 
 	if (encoder->packetno == 0)
 		opus_encoder_generate_head(encoder);
 	else if (encoder->packetno == 1)
 		opus_encoder_generate_tags(encoder);
 
-	ogg_page page;
-	int result = ogg_stream_pageout(&encoder->os, &page);
-	if (result == 0 && encoder->flush) {
-		encoder->flush = false;
-		result = ogg_stream_flush(&encoder->os, &page);
-
-	}
-
-	if (result == 0)
-		return 0;
-
-	assert(page.header_len > 0 || page.body_len > 0);
-
-	size_t nbytes = (size_t)page.header_len + (size_t)page.body_len;
-
-	if (nbytes > length)
-		/* XXX better error handling */
-		MPD_ERROR("buffer too small");
-
-	memcpy(dest, page.header, page.header_len);
-	memcpy(dest + page.header_len, page.body, page.body_len);
-
-	return nbytes;
+	return encoder->stream.PageOut(dest, length);
 }
 
 static const char *
diff --git a/src/encoder/VorbisEncoderPlugin.cxx b/src/encoder/VorbisEncoderPlugin.cxx
index ff1c6b8d..bc0f47fd 100644
--- a/src/encoder/VorbisEncoderPlugin.cxx
+++ b/src/encoder/VorbisEncoderPlugin.cxx
@@ -19,6 +19,7 @@
 
 #include "config.h"
 #include "VorbisEncoderPlugin.hxx"
+#include "OggStream.hxx"
 
 extern "C" {
 #include "encoder_api.h"
@@ -49,13 +50,11 @@ struct vorbis_encoder {
 
 	struct audio_format audio_format;
 
-	ogg_stream_state os;
-
 	vorbis_dsp_state vd;
 	vorbis_block vb;
 	vorbis_info vi;
 
-	bool flush;
+	OggStream stream;
 };
 
 static inline GQuark
@@ -177,7 +176,7 @@ vorbis_encoder_reinit(struct vorbis_encoder *encoder, GError **error)
 
 	vorbis_analysis_init(&encoder->vd, &encoder->vi);
 	vorbis_block_init(&encoder->vd, &encoder->vb);
-	ogg_stream_init(&encoder->os, g_random_int());
+	encoder->stream.Initialize(g_random_int());
 
 	return true;
 }
@@ -190,9 +189,9 @@ vorbis_encoder_headerout(struct vorbis_encoder *encoder, vorbis_comment *vc)
 	vorbis_analysis_headerout(&encoder->vd, vc,
 				  &packet, &comments, &codebooks);
 
-	ogg_stream_packetin(&encoder->os, &packet);
-	ogg_stream_packetin(&encoder->os, &comments);
-	ogg_stream_packetin(&encoder->os, &codebooks);
+	encoder->stream.PacketIn(packet);
+	encoder->stream.PacketIn(comments);
+	encoder->stream.PacketIn(codebooks);
 }
 
 static void
@@ -221,17 +220,13 @@ vorbis_encoder_open(struct encoder *_encoder,
 
 	vorbis_encoder_send_header(encoder);
 
-	/* set "flush" to true, so the caller gets the full headers on
-	   the first read() */
-	encoder->flush = true;
-
 	return true;
 }
 
 static void
 vorbis_encoder_clear(struct vorbis_encoder *encoder)
 {
-	ogg_stream_clear(&encoder->os);
+	encoder->stream.Deinitialize();
 	vorbis_block_clear(&encoder->vb);
 	vorbis_dsp_clear(&encoder->vd);
 	vorbis_info_clear(&encoder->vi);
@@ -254,7 +249,7 @@ vorbis_encoder_blockout(struct vorbis_encoder *encoder)
 
 		ogg_packet packet;
 		while (vorbis_bitrate_flushpacket(&encoder->vd, &packet))
-			ogg_stream_packetin(&encoder->os, &packet);
+			encoder->stream.PacketIn(packet);
 	}
 }
 
@@ -263,7 +258,7 @@ vorbis_encoder_flush(struct encoder *_encoder, G_GNUC_UNUSED GError **error)
 {
 	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;
 
-	encoder->flush = true;
+	encoder->stream.Flush();
 	return true;
 }
 
@@ -282,7 +277,7 @@ vorbis_encoder_pre_tag(struct encoder *_encoder, G_GNUC_UNUSED GError **error)
 	vorbis_analysis_init(&encoder->vd, &encoder->vi);
 	vorbis_block_init(&encoder->vd, &encoder->vb);
 
-	encoder->flush = true;
+	encoder->stream.Flush();
 	return true;
 }
 
@@ -311,18 +306,13 @@ vorbis_encoder_tag(struct encoder *_encoder, const struct tag *tag,
 
 	/* reset ogg_stream_state and begin a new stream */
 
-	ogg_stream_reset_serialno(&encoder->os, g_random_int());
+	encoder->stream.Reinitialize(g_random_int());
 
 	/* send that vorbis_comment to the ogg_stream_state */
 
 	vorbis_encoder_headerout(encoder, &comment);
 	vorbis_comment_clear(&comment);
 
-	/* the next vorbis_encoder_read() call should flush the
-	   ogg_stream_state */
-
-	encoder->flush = true;
-
 	return true;
 }
 
@@ -359,34 +349,11 @@ vorbis_encoder_write(struct encoder *_encoder,
 }
 
 static size_t
-vorbis_encoder_read(struct encoder *_encoder, void *_dest, size_t length)
+vorbis_encoder_read(struct encoder *_encoder, void *dest, size_t length)
 {
 	struct vorbis_encoder *encoder = (struct vorbis_encoder *)_encoder;
-	unsigned char *dest = (unsigned char *)_dest;
-
-	ogg_page page;
-	int ret = ogg_stream_pageout(&encoder->os, &page);
-	if (ret == 0 && encoder->flush) {
-		encoder->flush = false;
-		ret = ogg_stream_flush(&encoder->os, &page);
-
-	}
-
-	if (ret == 0)
-		return 0;
-
-	assert(page.header_len > 0 || page.body_len > 0);
-
-	size_t nbytes = (size_t)page.header_len + (size_t)page.body_len;
-
-	if (nbytes > length)
-		/* XXX better error handling */
-		MPD_ERROR("buffer too small");
-
-	memcpy(dest, page.header, page.header_len);
-	memcpy(dest + page.header_len, page.body, page.body_len);
 
-	return nbytes;
+	return encoder->stream.PageOut(dest, length);
 }
 
 static const char *