shout: use the new encoder API

Removed shout's encoder plugin API in favor of the new generic encoder
plugin API.

6 files changed, 103 insertions, 566 deletions

diff --git a/configure.ac b/configure.ac
index 572917cd..8c1e1d2c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -557,8 +557,7 @@ if test x$enable_shout_ogg = xyes; then
 		enable_shout_ogg=no
 	fi
 	if test x$enable_shout_ogg = xyes; then
-		PKG_CHECK_MODULES(VORBISENC, [vorbisenc],
-			AC_DEFINE(HAVE_SHOUT_OGG, 1, [Define to enable ogg streaming support]),
+		PKG_CHECK_MODULES(VORBISENC, [vorbisenc],,
 			enable_shout_ogg=no)
 	fi
 fi
@@ -573,9 +572,6 @@ if test x$enable_shout_mp3 = xyes; then
 		AC_MSG_WARN([disabling mp3 shout streaming support because lame is not enabled])
 		enable_shout_mp3=no
 	fi
-	if test x$enable_shout_mp3 = xyes; then
-		AC_DEFINE(HAVE_SHOUT_MP3, 1, [Define to enable mp3 streaming support])
-	fi
 fi
 
 if test x$enable_shout_ogg = xyes || test x$enable_shout_mp3 = xyes; then
@@ -586,8 +582,6 @@ else
 fi
 
 AM_CONDITIONAL(HAVE_SHOUT, test x$enable_shout = xyes)
-AM_CONDITIONAL(HAVE_SHOUT_OGG, test x$enable_shout_ogg = xyes)
-AM_CONDITIONAL(HAVE_SHOUT_MP3, test x$enable_shout_mp3 = xyes)
 
 AM_CONDITIONAL(ENABLE_ENCODER, test x$enable_shout = xyes)
 AM_CONDITIONAL(ENABLE_VORBIS_ENCODER, test x$enable_shout_ogg = xyes)
diff --git a/src/Makefile.am b/src/Makefile.am
index 03785d97..942bc564 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -419,14 +419,6 @@ if HAVE_SHOUT
 mpd_SOURCES += output/shout_plugin.c
 endif
 
-if HAVE_SHOUT_MP3
-mpd_SOURCES += output/shout_mp3.c
-endif
-
-if HAVE_SHOUT_OGG
-mpd_SOURCES += output/shout_ogg.c
-endif
-
 # sparse is a semantic parser
 # URL: git://www.kernel.org/pub/scm/devel/sparse/sparse.git
 SPARSE = sparse
diff --git a/src/output/shout_mp3.c b/src/output/shout_mp3.c
deleted file mode 100644
index a4ed37a1..00000000
--- a/src/output/shout_mp3.c
+++ /dev/null
@@ -1,193 +0,0 @@
-/* the Music Player Daemon (MPD)
- * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
- * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-#include "shout_plugin.h"
-
-#include <lame/lame.h>
-
-#include <assert.h>
-#include <stdlib.h>
-
-struct lame_data {
-	lame_global_flags *gfp;
-};
-
-
-static int shout_mp3_encoder_init(struct shout_data *sd)
-{
-	struct lame_data *ld = g_new(struct lame_data, 1);
-
-	sd->encoder_data = ld;
-
-	return 0;
-}
-
-static int shout_mp3_encoder_clear_encoder(struct shout_data *sd)
-{
-	struct lame_data *ld = (struct lame_data *)sd->encoder_data;
-	struct shout_buffer *buf = &sd->buf;
-	int ret;
-
-	ret = lame_encode_flush(ld->gfp, buf->data, sizeof(buf->data));
-	if (ret < 0)
-		g_warning("error flushing lame buffers\n");
-
-	lame_close(ld->gfp);
-	ld->gfp = NULL;
-
-	return (ret > 0);
-}
-
-static void shout_mp3_encoder_finish(struct shout_data *sd)
-{
-	struct lame_data *ld = (struct lame_data *)sd->encoder_data;
-
-	assert(ld->gfp == NULL);
-
-	g_free(ld);
-}
-
-static int shout_mp3_encoder_init_encoder(struct shout_data *sd)
-{
-	struct lame_data *ld = (struct lame_data *)sd->encoder_data;
-
-	if (NULL == (ld->gfp = lame_init())) {
-		g_warning("error initializing lame encoder for shout\n");
-		return -1;
-	}
-
-	if (sd->quality >= -1.0) {
-		if (0 != lame_set_VBR(ld->gfp, vbr_rh)) {
-			g_warning("error setting lame VBR mode\n");
-			return -1;
-		}
-		if (0 != lame_set_VBR_q(ld->gfp, sd->quality)) {
-			g_warning("error setting lame VBR quality\n");
-			return -1;
-		}
-	} else {
-		if (0 != lame_set_brate(ld->gfp, sd->bitrate)) {
-			g_warning("error setting lame bitrate\n");
-			return -1;
-		}
-	}
-
-	if (0 != lame_set_num_channels(ld->gfp,
-				       sd->audio_format.channels)) {
-		g_warning("error setting lame num channels\n");
-		return -1;
-	}
-
-	if (0 != lame_set_in_samplerate(ld->gfp,
-					sd->audio_format.sample_rate)) {
-		g_warning("error setting lame sample rate\n");
-		return -1;
-	}
-
-	if (0 > lame_init_params(ld->gfp))
-		g_error("error initializing lame params\n");
-
-	return 0;
-}
-
-static int shout_mp3_encoder_send_metadata(struct shout_data *sd,
-					   char * song, size_t size)
-{
-	char artist[size];
-	char title[size];
-	int i;
-	const struct tag *tag = sd->tag;
-
-	strncpy(artist, "", size);
-	strncpy(title, "", size);
-
-	for (i = 0; i < tag->numOfItems; i++) {
-		switch (tag->items[i]->type) {
-		case TAG_ITEM_ARTIST:
-			strncpy(artist, tag->items[i]->value, size);
-			break;
-		case TAG_ITEM_TITLE:
-			strncpy(title, tag->items[i]->value, size);
-			break;
-
-		default:
-			break;
-		}
-	}
-	snprintf(song, size, "%s - %s", title, artist);
-
-	return 1;
-}
-
-static int
-shout_mp3_encoder_encode(struct shout_data *sd, const void *chunk, size_t len)
-{
-	const int16_t *src = (const int16_t*)chunk;
-	unsigned int i;
-	float *left, *right;
-	struct shout_buffer *buf = &(sd->buf);
-	unsigned int samples;
-	struct lame_data *ld = (struct lame_data *)sd->encoder_data;
-	int bytes_out;
-
-	samples = len / audio_format_sample_size(&sd->audio_format);
-	left = g_malloc(sizeof(left[0]) * samples);
-	if (sd->audio_format.channels > 1)
-		right = g_malloc(sizeof(left[0]) * samples);
-	else
-		right = left;
-
-	/* this is for only 16-bit audio */
-
-	for (i = 0; i < samples; i++) {
-		left[i] = src[0];
-		if (right != left)
-			right[i] = src[1];
-		src += sd->audio_format.channels;
-	}
-
-	bytes_out = lame_encode_buffer_float(ld->gfp, left, right,
-					     samples, buf->data,
-					     sizeof(buf->data));
-
-	g_free(left);
-	if (right != left)
-		g_free(right);
-
-	if (0 > bytes_out) {
-		g_warning("error encoding lame buffer for shout\n");
-		lame_close(ld->gfp);
-		ld->gfp = NULL;
-		return -1;
-	} else
-		buf->len = bytes_out; /* signed to unsigned conversion */
-
-	return 0;
-}
-
-const struct shout_encoder_plugin shout_mp3_encoder = {
-	"mp3",
-	SHOUT_FORMAT_MP3,
-
-	shout_mp3_encoder_clear_encoder,
-	shout_mp3_encoder_encode,
-	shout_mp3_encoder_finish,
-	shout_mp3_encoder_init,
-	shout_mp3_encoder_init_encoder,
-	shout_mp3_encoder_send_metadata,
-};
diff --git a/src/output/shout_ogg.c b/src/output/shout_ogg.c
deleted file mode 100644
index 8b769e8c..00000000
--- a/src/output/shout_ogg.c
+++ /dev/null
@@ -1,293 +0,0 @@
-/* the Music Player Daemon (MPD)
- * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
- * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-#include "shout_plugin.h"
-
-#include <vorbis/vorbisenc.h>
-#include <stdlib.h>
-
-struct ogg_vorbis_data {
-	ogg_stream_state os;
-	ogg_page og;
-	ogg_packet op;
-	ogg_packet header_main;
-	ogg_packet header_comments;
-	ogg_packet header_codebooks;
-
-	vorbis_dsp_state vd;
-	vorbis_block vb;
-	vorbis_info vi;
-	vorbis_comment vc;
-};
-
-static void add_tag(struct ogg_vorbis_data *od, const char *name, char *value)
-{
-	if (value) {
-		union {
-			const char *in;
-			char *out;
-		} u = { .in = name };
-		vorbis_comment_add_tag(&od->vc, u.out, value);
-	}
-}
-
-static void copy_tag_to_vorbis_comment(struct shout_data *sd)
-{
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-
-	if (sd->tag) {
-		int i;
-
-		for (i = 0; i < sd->tag->numOfItems; i++) {
-			switch (sd->tag->items[i]->type) {
-			case TAG_ITEM_ARTIST:
-				add_tag(od, "ARTIST", sd->tag->items[i]->value);
-				break;
-			case TAG_ITEM_ALBUM:
-				add_tag(od, "ALBUM", sd->tag->items[i]->value);
-				break;
-			case TAG_ITEM_TITLE:
-				add_tag(od, "TITLE", sd->tag->items[i]->value);
-				break;
-
-			default:
-				break;
-			}
-		}
-	}
-}
-
-static int copy_ogg_buffer_to_shout_buffer(ogg_page *og,
-					   struct shout_buffer *buf)
-{
-	if ((size_t)og->header_len + (size_t)og->body_len > sizeof(buf->data)) {
-		g_warning("%s: not enough buffer space!\n", __func__);
-		return -1;
-	}
-
-	memcpy(buf->data, og->header, og->header_len);
-	memcpy(buf->data + og->header_len, og->body, og->body_len);
-	buf->len = og->header_len + og->body_len;
-
-	return 0;
-}
-
-static int flush_ogg_buffer(struct shout_data *sd)
-{
-	struct shout_buffer *buf = &sd->buf;
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-	int ret = 0;
-
-	if (ogg_stream_flush(&od->os, &od->og))
-		ret = copy_ogg_buffer_to_shout_buffer(&od->og, buf);
-
-	return ret;
-}
-
-static int send_ogg_vorbis_header(struct shout_data *sd)
-{
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-
-	vorbis_analysis_headerout(&od->vd, &od->vc,
-				  &od->header_main,
-				  &od->header_comments,
-				  &od->header_codebooks);
-
-	ogg_stream_packetin(&od->os, &od->header_main);
-	ogg_stream_packetin(&od->os, &od->header_comments);
-	ogg_stream_packetin(&od->os, &od->header_codebooks);
-
-	return flush_ogg_buffer(sd);
-}
-
-static void finish_encoder(struct ogg_vorbis_data *od)
-{
-	vorbis_analysis_wrote(&od->vd, 0);
-
-	while (vorbis_analysis_blockout(&od->vd, &od->vb) == 1) {
-		vorbis_analysis(&od->vb, NULL);
-		vorbis_bitrate_addblock(&od->vb);
-		while (vorbis_bitrate_flushpacket(&od->vd, &od->op)) {
-			ogg_stream_packetin(&od->os, &od->op);
-		}
-	}
-}
-
-static int shout_ogg_encoder_clear_encoder(struct shout_data *sd)
-{
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-	int ret;
-
-	finish_encoder(od);
-	if ((ret = ogg_stream_pageout(&od->os, &od->og)))
-		copy_ogg_buffer_to_shout_buffer(&od->og, &sd->buf);
-
-	vorbis_comment_clear(&od->vc);
-	ogg_stream_clear(&od->os);
-	vorbis_block_clear(&od->vb);
-	vorbis_dsp_clear(&od->vd);
-	vorbis_info_clear(&od->vi);
-
-	return ret;
-}
-
-static void shout_ogg_encoder_finish(struct shout_data *sd)
-{
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-
-	if (od) {
-		free(od);
-		sd->encoder_data = NULL;
-	}
-}
-
-static int shout_ogg_encoder_init(struct shout_data *sd)
-{
-	struct ogg_vorbis_data *od = g_new(struct ogg_vorbis_data, 1);
-
-	sd->encoder_data = od;
-
-	return 0;
-}
-
-static int reinit_encoder(struct shout_data *sd)
-{
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-
-	vorbis_info_init(&od->vi);
-
-	if (sd->quality >= -1.0) {
-		if (0 != vorbis_encode_init_vbr(&od->vi,
-						sd->audio_format.channels,
-						sd->audio_format.sample_rate,
-						sd->quality * 0.1)) {
-			g_warning("error initializing vorbis vbr\n");
-			vorbis_info_clear(&od->vi);
-			return -1;
-		}
-	} else {
-		if (0 != vorbis_encode_init(&od->vi,
-					    sd->audio_format.channels,
-					    sd->audio_format.sample_rate, -1.0,
-					    sd->bitrate * 1000, -1.0)) {
-			g_warning("error initializing vorbis encoder\n");
-			vorbis_info_clear(&od->vi);
-			return -1;
-		}
-	}
-
-	vorbis_analysis_init(&od->vd, &od->vi);
-	vorbis_block_init(&od->vd, &od->vb);
-	ogg_stream_init(&od->os, rand());
-	vorbis_comment_init(&od->vc);
-
-	return 0;
-}
-
-static int shout_ogg_encoder_init_encoder(struct shout_data *sd)
-{
-	if (reinit_encoder(sd))
-		return -1;
-
-	if (send_ogg_vorbis_header(sd)) {
-		g_warning("error sending ogg vorbis header for shout\n");
-		return -1;
-	}
-
-	return 0;
-}
-
-static int shout_ogg_encoder_send_metadata(struct shout_data *sd,
-					   G_GNUC_UNUSED char * song,
-					   G_GNUC_UNUSED size_t size)
-{
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-
-	shout_ogg_encoder_clear_encoder(sd);
-	if (reinit_encoder(sd))
-		return 0;
-
-	copy_tag_to_vorbis_comment(sd);
-
-	vorbis_analysis_headerout(&od->vd, &od->vc,
-				  &od->header_main,
-				  &od->header_comments,
-				  &od->header_codebooks);
-
-	ogg_stream_packetin(&od->os, &od->header_main);
-	ogg_stream_packetin(&od->os, &od->header_comments);
-	ogg_stream_packetin(&od->os, &od->header_codebooks);
-
-	flush_ogg_buffer(sd);
-
-	return 0;
-}
-
-static void
-pcm16_to_ogg_buffer(float **dest, const int16_t *src,
-		    unsigned num_samples, unsigned num_channels)
-{
-	for (unsigned i = 0; i < num_samples; i++)
-		for (unsigned j = 0; j < num_channels; j++)
-			dest[j][i] = *src++ / 32768.0;
-}
-
-static int
-shout_ogg_encoder_encode(struct shout_data *sd,
-			 const void *chunk, size_t size)
-{
-	struct shout_buffer *buf = &sd->buf;
-	unsigned int samples;
-	struct ogg_vorbis_data *od = (struct ogg_vorbis_data *)sd->encoder_data;
-
-	samples = size / audio_format_frame_size(&sd->audio_format);
-
-	/* this is for only 16-bit audio */
-
-	pcm16_to_ogg_buffer(vorbis_analysis_buffer(&od->vd, samples),
-			    (const int16_t *)chunk,
-			    samples, sd->audio_format.channels);
-
-	vorbis_analysis_wrote(&od->vd, samples);
-
-	while (1 == vorbis_analysis_blockout(&od->vd, &od->vb)) {
-		vorbis_analysis(&od->vb, NULL);
-		vorbis_bitrate_addblock(&od->vb);
-
-		while (vorbis_bitrate_flushpacket(&od->vd, &od->op)) {
-			ogg_stream_packetin(&od->os, &od->op);
-		}
-	}
-
-	if (ogg_stream_pageout(&od->os, &od->og))
-		copy_ogg_buffer_to_shout_buffer(&od->og, buf);
-
-	return 0;
-}
-
-const struct shout_encoder_plugin shout_ogg_encoder = {
-	"ogg",
-	SHOUT_FORMAT_VORBIS,
-
-	shout_ogg_encoder_clear_encoder,
-	shout_ogg_encoder_encode,
-	shout_ogg_encoder_finish,
-	shout_ogg_encoder_init,
-	shout_ogg_encoder_init_encoder,
-	shout_ogg_encoder_send_metadata,
-};
diff --git a/src/output/shout_plugin.c b/src/output/shout_plugin.c
index f03d8023..53635317 100644
--- a/src/output/shout_plugin.c
+++ b/src/output/shout_plugin.c
@@ -17,6 +17,8 @@
  */
 
 #include "shout_plugin.h"
+#include "encoder_plugin.h"
+#include "encoder_list.h"
 #include "config.h"
 
 #include <assert.h>
@@ -37,16 +39,15 @@ static const struct shout_encoder_plugin *const shout_encoder_plugins[] = {
 	NULL
 };
 
-static const struct shout_encoder_plugin *
+static const struct encoder_plugin *
 shout_encoder_plugin_get(const char *name)
 {
-	unsigned i;
+	if (strcmp(name, "ogg") == 0)
+		name = "vorbis";
+	else if (strcmp(name, "mp3") == 0)
+		name = "lame";
 
-	for (i = 0; shout_encoder_plugins[i] != NULL; ++i)
-		if (strcmp(shout_encoder_plugins[i]->name, name) == 0)
-			return shout_encoder_plugins[i];
-
-	return NULL;
+	return encoder_plugin_get(name);
 }
 
 static struct shout_data *new_shout_data(void)
@@ -91,6 +92,9 @@ static void *my_shout_init_driver(struct audio_output *audio_output,
 	char *mount;
 	char *passwd;
 	const char *encoding;
+	const struct encoder_plugin *encoder_plugin;
+	GError *error = NULL;
+	unsigned shout_format;
 	unsigned protocol;
 	const char *user;
 	char *name;
@@ -162,15 +166,21 @@ static void *my_shout_init_driver(struct audio_output *audio_output,
 
 	check_block_param("format");
 
-	assert(audio_format != NULL);
-	sd->audio_format = *audio_format;
-
 	encoding = config_get_block_string(param, "encoding", "ogg");
-	sd->encoder = shout_encoder_plugin_get(encoding);
-	if (sd->encoder == NULL)
+	encoder_plugin = shout_encoder_plugin_get(encoding);
+	if (encoder_plugin == NULL)
 		g_error("couldn't find shout encoder plugin \"%s\"\n",
 			encoding);
 
+	sd->encoder = encoder_init(encoder_plugin, param, &error);
+	if (sd->encoder == NULL)
+		g_error("%s", error->message);
+
+	if (strcmp(encoding, "mp3") == 0 || strcmp(encoding, "lame") == 0)
+		shout_format = SHOUT_FORMAT_MP3;
+	else
+		shout_format = SHOUT_FORMAT_OGG;
+
 	value = config_get_block_string(param, "protocol", NULL);
 	if (value != NULL) {
 		if (0 == strcmp(value, "shoutcast") &&
@@ -199,7 +209,7 @@ static void *my_shout_init_driver(struct audio_output *audio_output,
 	    shout_set_name(sd->shout_conn, name) != SHOUTERR_SUCCESS ||
 	    shout_set_user(sd->shout_conn, user) != SHOUTERR_SUCCESS ||
 	    shout_set_public(sd->shout_conn, public) != SHOUTERR_SUCCESS ||
-	    shout_set_format(sd->shout_conn, sd->encoder->shout_format)
+	    shout_set_format(sd->shout_conn, shout_format)
 	    != SHOUTERR_SUCCESS ||
 	    shout_set_protocol(sd->shout_conn, protocol) != SHOUTERR_SUCCESS ||
 	    shout_set_agent(sd->shout_conn, "MPD") != SHOUTERR_SUCCESS) {
@@ -227,10 +237,10 @@ static void *my_shout_init_driver(struct audio_output *audio_output,
 		char temp[11];
 		memset(temp, 0, sizeof(temp));
 
-		snprintf(temp, sizeof(temp), "%u", sd->audio_format.channels);
+		snprintf(temp, sizeof(temp), "%u", audio_format->channels);
 		shout_set_audio_info(sd->shout_conn, SHOUT_AI_CHANNELS, temp);
 
-		snprintf(temp, sizeof(temp), "%u", sd->audio_format.sample_rate);
+		snprintf(temp, sizeof(temp), "%u", audio_format->sample_rate);
 
 		shout_set_audio_info(sd->shout_conn, SHOUT_AI_SAMPLERATE, temp);
 
@@ -245,10 +255,6 @@ static void *my_shout_init_driver(struct audio_output *audio_output,
 		}
 	}
 
-	if (sd->encoder->init_func(sd) != 0)
-		g_error("shout: encoder plugin '%s' failed to initialize\n",
-			sd->encoder->name);
-
 	return sd;
 }
 
@@ -283,6 +289,10 @@ write_page(struct shout_data *sd)
 {
 	int err;
 
+	assert(sd->encoder != NULL);
+
+	sd->buf.len = encoder_read(sd->encoder,
+				   sd->buf.data, sizeof(sd->buf.data));
 	if (sd->buf.len == 0)
 		return true;
 
@@ -298,8 +308,12 @@ static void close_shout_conn(struct shout_data * sd)
 {
 	sd->buf.len = 0;
 
-	if (sd->encoder->clear_encoder_func(sd))
-		write_page(sd);
+	if (sd->encoder != NULL) {
+		if (encoder_flush(sd->encoder, NULL))
+			write_page(sd);
+
+		encoder_close(sd->encoder);
+	}
 
 	if (shout_get_connected(sd->shout_conn) != SHOUTERR_UNCONNECTED &&
 	    shout_close(sd->shout_conn) != SHOUTERR_SUCCESS) {
@@ -312,7 +326,8 @@ static void my_shout_finish_driver(void *data)
 {
 	struct shout_data *sd = (struct shout_data *)data;
 
-	sd->encoder->finish_func(sd);
+	encoder_finish(sd->encoder);
+
 	free_shout_data(sd);
 
 	shout_init_count--;
@@ -357,11 +372,11 @@ shout_connect(struct shout_data *sd)
 }
 
 static bool
-my_shout_open_device(void *data,
-		     G_GNUC_UNUSED struct audio_format *audio_format)
+my_shout_open_device(void *data, struct audio_format *audio_format)
 {
 	struct shout_data *sd = (struct shout_data *)data;
 	bool ret;
+	GError *error = NULL;
 
 	ret = shout_connect(sd);
 	if (!ret)
@@ -369,8 +384,11 @@ my_shout_open_device(void *data,
 
 	sd->buf.len = 0;
 
-	if (sd->encoder->init_encoder_func(sd) < 0) {
+	ret = encoder_open(sd->encoder, audio_format, &error);
+	if (!ret) {
 		shout_close(sd->shout_conn);
+		g_warning("%s", error->message);
+		g_error_free(error);
 		return false;
 	}
 
@@ -383,11 +401,15 @@ static bool
 my_shout_play(void *data, const char *chunk, size_t size)
 {
 	struct shout_data *sd = (struct shout_data *)data;
+	bool ret;
+	GError *error = NULL;
 
-	sd->buf.len = 0;
-
-	if (sd->encoder->encode_func(sd, chunk, size))
+	ret = encoder_write(sd->encoder, chunk, size, &error);
+	if (!ret) {
+		g_warning("%s", error->message);
+		g_error_free(error);
 		return false;
+	}
 
 	return write_page(sd);
 }
@@ -400,17 +422,63 @@ my_shout_pause(void *data)
 	return my_shout_play(data, silence, sizeof(silence));
 }
 
+static void
+shout_tag_to_metadata(const struct tag *tag, char *dest, size_t size)
+{
+	char artist[size];
+	char title[size];
+	int i;
+
+	artist[0] = 0;
+	title[0] = 0;
+
+	for (i = 0; i < tag->numOfItems; i++) {
+		switch (tag->items[i]->type) {
+		case TAG_ITEM_ARTIST:
+			strncpy(artist, tag->items[i]->value, size);
+			break;
+		case TAG_ITEM_TITLE:
+			strncpy(title, tag->items[i]->value, size);
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	snprintf(dest, size, "%s - %s", title, artist);
+}
+
 static void my_shout_set_tag(void *data,
 			     const struct tag *tag)
 {
 	struct shout_data *sd = (struct shout_data *)data;
-	char song[1024];
 	bool ret;
+	GError *error = NULL;
+
+	if (sd->encoder->plugin->tag != NULL) {
+		/* encoder plugin supports stream tags */
+
+		ret = encoder_flush(sd->encoder, &error);
+		if (!ret) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+			return;
+		}
+
+		write_page(sd);
+
+		ret = encoder_tag(sd->encoder, tag, &error);
+		if (!ret) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+		}
+	} else {
+		/* no stream tag support: fall back to icy-metadata */
+		char song[1024];
+
+		shout_tag_to_metadata(tag, song, sizeof(song));
 
-	sd->buf.len = 0;
-	sd->tag = tag;
-	ret = sd->encoder->send_metadata_func(sd, song, sizeof(song));
-	if (ret) {
 		shout_metadata_add(sd->shout_meta, "song", song);
 		if (SHOUTERR_SUCCESS != shout_set_metadata(sd->shout_conn,
 							   sd->shout_meta)) {
diff --git a/src/output/shout_plugin.h b/src/output/shout_plugin.h
index eb40907d..4bc6dac9 100644
--- a/src/output/shout_plugin.h
+++ b/src/output/shout_plugin.h
@@ -28,28 +28,6 @@
 #undef G_LOG_DOMAIN
 #define G_LOG_DOMAIN "shout"
 
-struct shout_data;
-
-struct shout_encoder_plugin {
-	const char *name;
-	unsigned int shout_format;
-
-	int (*clear_encoder_func)(struct shout_data *sd);
-	int (*encode_func)(struct shout_data *sd,
-			   const void *chunk, size_t len);
-	void (*finish_func)(struct shout_data *sd);
-	int (*init_func)(struct shout_data *sd);
-	int (*init_encoder_func) (struct shout_data *sd);
-	/* Called when there is a new MpdTag to encode into the
-	   stream.  If this function returns non-zero, then the
-	   resulting song will be passed to the shout server as
-	   metadata.  This allows the Ogg encoder to send metadata via
-	   Vorbis comments in the stream, while an MP3 encoder can use
-	   the Shout Server's metadata API. */
-	int (*send_metadata_func)(struct shout_data *sd,
-				  char *song, size_t size);
-};
-
 struct shout_buffer {
 	unsigned char data[32768];
 	size_t len;
@@ -61,23 +39,14 @@ struct shout_data {
 	shout_t *shout_conn;
 	shout_metadata_t *shout_meta;
 
-	const struct shout_encoder_plugin *encoder;
-	void *encoder_data;
+	struct encoder *encoder;
 
 	float quality;
 	int bitrate;
 
-	const struct tag *tag;
-
 	int timeout;
 
-	/* the configured audio format */
-	struct audio_format audio_format;
-
 	struct shout_buffer buf;
 };
 
-extern const struct shout_encoder_plugin shout_mp3_encoder;
-extern const struct shout_encoder_plugin shout_ogg_encoder;
-
 #endif