shout: added mp3 encoder

[mk: moved this patch after "Refactor and cleanup of shout Ogg and MP3
audio outputs".  The original commit message follows, although it is
outdated:]

Creation of shout_mp3 audio output plugin. Basically I just copied the
existing shout plugin and replaced ogg with lame. Uses lame for mp3
encoding. Next step is to pull common functionality out of each shout
plugin and share it between them.

Configuration options for "shout_mp3" are the same as for "shout".

6 files changed, 340 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index ffe16130..d98eb648 100644
--- a/configure.ac
+++ b/configure.ac
@@ -74,6 +74,7 @@ fi
 
 AC_ARG_ENABLE(ao,[  --enable-ao             enable support for libao (default: disable)],[enable_ao=$enableval],[enable_ao=no])
 AC_ARG_ENABLE(shout_ogg,[  --disable-shout_ogg     disable support for ogg streaming through shout (default: enable)],[enable_shout_ogg=$enableval],[enable_shout_ogg=yes])
+AC_ARG_ENABLE(shout_mp3,[  --disable-shout_mp3     disable support for mp3 streaming through shout (default: enable)],[enable_shout_mp3=$enableval],[enable_shout_mp3=yes])
 AC_ARG_ENABLE(iconv,[  --disable-iconv         disable iconv support (default: enable)],[enable_iconv=$enableval],[enable_iconv=yes])
 AC_ARG_ENABLE(ipv6,[  --disable-ipv6          disable IPv6 support (default: enable)],[enable_ipv6=$enableval],[enable_ipv6=yes])
 AC_ARG_ENABLE(tcp,[  --disable-tcp           disable support for clients connecting via TCP (default: enable)],[enable_tcp=$enableval],[enable_tcp=yes])
@@ -88,6 +89,7 @@ AC_ARG_ENABLE(oggvorbis,[  --disable-oggvorbis     disable Ogg Vorbis support (d
 AC_ARG_ENABLE(oggflac,[  --disable-oggflac       disable OggFLAC support (default: enable)],[enable_oggflac=$enableval],enable_oggflac=yes)
 AC_ARG_ENABLE(flac,[  --disable-flac          disable flac support (default: enable)],[enable_flac=$enableval],[enable_flac=yes])
 AC_ARG_ENABLE(mp3,[  --disable-mp3           disable mp3 support (default: enable)],[enable_mp3=$enableval],[enable_mp3=yes])
+AC_ARG_ENABLE(lame,[  --disable-lame          disable lame support (default: enable)],[enable_lame=$enableval],[enable_lame=yes])
 AC_ARG_ENABLE(aac,[  --disable-aac           disable AAC support (default: enable)],[enable_aac=$enableval],[enable_aac=yes])
 AC_ARG_ENABLE(audiofile,[  --disable-audiofile     disable audiofile support, disables wave support (default: enable)],[enable_audiofile=$enableval],[enable_audiofile=yes])
 AC_ARG_ENABLE(mod,[  --enable-mod            enable MOD support (default: disable)],[enable_mod=$enableval],[enable_mod=yes])
@@ -207,6 +209,20 @@ if test x$enable_shout_ogg = xyes; then
 	fi
 fi
 
+if test x$enable_shout_mp3 = xyes; then
+	if test x$enable_lame = xno; then
+		AC_MSG_WARN([disabling mp3 shout streaming support because lame is not enabled])
+		enable_shout_mp3=no
+	fi
+	if test x$enable_shout = xno; then
+		AC_MSG_WARN([disabling mp3 shout streaming support because libshout is not found])
+		enable_shout_mp3=no
+	fi
+	if test x$enable_shout_mp3 = xyes; then
+		AC_DEFINE(HAVE_SHOUT_MP3, 1, [Define to enable mp3 streaming support])
+	fi
+fi
+
 if test x$enable_ao = xyes; then
 	XIPH_PATH_AO([AC_DEFINE(HAVE_AO, 1, [Define to play with ao]) MPD_LIBS="$MPD_LIBS $AO_LIBS" MPD_CFLAGS="$MPD_CFLAGS $AO_CFLAGS"], enable_ao=no)
 fi
@@ -364,6 +380,12 @@ if test x$enable_mp3 = xyes; then
 	fi
 fi
 
+if test x$enable_lame = xyes; then
+	AM_PATH_LAME([MPD_LIBS="$MPD_LIBS $LAME_LIBS" MPD_CFLAGS="$MPD_CFLAGS $LAME_CFLAGS"],
+	             [enable_lame=no;AC_MSG_WARN(You need lame -- disabling lame support)])
+fi
+
+
 if test x$enable_mpc = xyes; then
   	if test "x$mpcdec_libraries" != "x" ; then
   		MPCDEC_LIBS="-L$mpcdec_libraries"
@@ -753,11 +775,18 @@ else
 	echo " Shout ogg streaming support ...disabled"
 fi
 
+if test x$enable_shout_mp3 = xyes; then
+	echo " Shout mp3 streaming support ...enabled"
+else
+	echo " Shout mp3 streaming support ...disabled"
+fi
+
 echo ""
 
 if test x$enable_ao = xno &&
    test x$enable_oss = xno &&
    test x$enable_shout_ogg = xno &&
+   test x$enable_shout_mp3 = xno &&
    test x$enable_alsa = xno &&
    test x$enable_osx = xno &&
    test x$enable_pulse = xno &&
@@ -781,6 +810,12 @@ else
 	echo " mp3 support ...................disabled"
 fi
 
+if test x$enable_lame = xyes; then
+        echo " lame support ..................enabled"
+else
+        echo " lame support ..................disabled"
+fi
+
 if test x$enable_oggvorbis = xyes; then
 	echo " Ogg Vorbis support ............enabled"
 	if test x$use_tremor = xyes; then
diff --git a/m4/lame.m4 b/m4/lame.m4
new file mode 100644
index 00000000..5ebf550d
--- /dev/null
+++ b/m4/lame.m4
@@ -0,0 +1,108 @@
+dnl borrowed from oddsock.org
+dnl AM_PATH_LAME([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+dnl Test for liblame, and define LAME_CFLAGS and LAME_LIBS
+dnl
+AC_DEFUN([AM_PATH_LAME],
+[dnl
+dnl Get the cflags and libraries
+dnl
+AC_ARG_WITH(lame,[  --with-lame=PFX   Prefix where liblame is installed (optional)], lame_prefix="$withval", lame_prefix="")
+AC_ARG_WITH(lame-libraries,[  --with-lame-libraries=DIR   Directory where liblame library is installed (optional)], lame_libraries="$withval", lame_libraries="")
+AC_ARG_WITH(lame-includes,[  --with-lame-includes=DIR   Directory where liblame header files are installed (optional)], lame_includes="$withval", lame_includes="")
+AC_ARG_ENABLE(lametest, [  --disable-lametest       Do not try to compile and run a test liblame program],, enable_lametest=yes)
+
+if test "x$lame_prefix" != "xno" ; then
+
+  if test "x$lame_libraries" != "x" ; then
+    LAME_LIBS="-L$lame_libraries"
+  elif test "x$lame_prefix" != "x" ; then
+    LAME_LIBS="-L$lame_prefix/lib"
+  elif test "x$prefix" != "xNONE" ; then
+    LAME_LIBS="-L$prefix/lib"
+  fi
+
+  LAME_LIBS="$LAME_LIBS -lmp3lame -lm"
+
+  if test "x$lame_includes" != "x" ; then
+    LAME_CFLAGS="-I$lame_includes"
+  elif test "x$lame_prefix" != "x" ; then
+    LAME_CFLAGS="-I$lame_prefix/include"
+  elif test "x$prefix" != "xNONE"; then
+    LAME_CFLAGS="-I$prefix/include"
+  fi
+
+  AC_MSG_CHECKING(for liblame)
+  no_lame=""
+
+
+  if test "x$enable_lametest" = "xyes" ; then
+    ac_save_CFLAGS="$CFLAGS"
+    ac_save_LIBS="$LIBS"
+    CFLAGS="$CFLAGS $LAME_CFLAGS"
+    LIBS="$LIBS $LAME_LIBS"
+dnl
+dnl Now check if the installed liblame is sufficiently new.
+dnl
+      rm -f conf.lametest
+      AC_TRY_RUN([
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <lame/lame.h>
+
+int main ()
+{
+  system("touch conf.lametest");
+  return 0;
+}
+
+],, no_lame=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
+       CFLAGS="$ac_save_CFLAGS"
+       LIBS="$ac_save_LIBS"
+  fi
+
+  if test "x$no_lame" = "x" ; then
+     AC_MSG_RESULT(yes)
+     ifelse([$1], , :, [$1])
+  else
+     AC_MSG_RESULT(no)
+     if test -f conf.lametest ; then
+       :
+     else
+       echo "*** Could not run liblame test program, checking why..."
+       CFLAGS="$CFLAGS $LAME_CFLAGS"
+       LIBS="$LIBS $LAME_LIBS"
+       AC_TRY_LINK([
+#include <stdio.h>
+#include <lame/lame.h>
+],     [ return 0; ],
+       [ echo "*** The test program compiled, but did not run. This usually means"
+       echo "*** that the run-time linker is not finding liblame or finding the wrong"
+       echo "*** version of liblame. If it is not finding liblame, you'll need to set your"
+       echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
+       echo "*** to the installed location  Also, make sure you have run ldconfig if that"
+       echo "*** is required on your system"
+       echo "***"
+       echo "*** If you have an old version installed, it is best to remove it, although"
+       echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
+       [ echo "*** The test program failed to compile or link. See the file config.log for the"
+       echo "*** exact error that occured. This usually means liblame was incorrectly installed"
+       echo "*** or that you have moved liblame since it was installed." ])
+       CFLAGS="$ac_save_CFLAGS"
+       LIBS="$ac_save_LIBS"
+     fi
+     LAME_CFLAGS=""
+     LAME_LIBS=""
+     ifelse([$2], , :, [$2])
+  fi
+  AC_DEFINE(HAVE_LAME, 1, [Define if you have liblame.])
+  use_lame="1"
+else
+  LAME_CFLAGS=""
+  LAME_LIBS=""
+fi
+  AC_SUBST(LAME_CFLAGS)
+  AC_SUBST(LAME_LIBS)
+  rm -f conf.lametest
+])
+
diff --git a/src/Makefile.am b/src/Makefile.am
index 097722dd..272a6319 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,6 +4,7 @@ SUBDIRS = $(MP4FF_SUBDIR)
 mpd_audioOutputs = \
 	audioOutputs/audioOutput_shout.c \
 	audioOutputs/audioOutput_shout_ogg.c \
+	audioOutputs/audioOutput_shout_mp3.c \
 	audioOutputs/audioOutput_null.c \
 	audioOutputs/audioOutput_fifo.c \
 	audioOutputs/audioOutput_alsa.c \
diff --git a/src/audioOutputs/audioOutput_shout.c b/src/audioOutputs/audioOutput_shout.c
index 1e60e354..82a68fa9 100644
--- a/src/audioOutputs/audioOutput_shout.c
+++ b/src/audioOutputs/audioOutput_shout.c
@@ -113,6 +113,7 @@ static void free_shout_data(struct shout_data *sd)
 static void load_shout_plugins(void)
 {
 	init_shout_encoder_plugins();
+	load_shout_encoder_plugin(&shout_mp3_encoder);
 	load_shout_encoder_plugin(&shout_ogg_encoder);
 }
 
diff --git a/src/audioOutputs/audioOutput_shout.h b/src/audioOutputs/audioOutput_shout.h
index c21ddff4..14f6b00a 100644
--- a/src/audioOutputs/audioOutput_shout.h
+++ b/src/audioOutputs/audioOutput_shout.h
@@ -94,6 +94,7 @@ struct shout_data {
 	shout_buffer buf;
 };
 
+extern shout_encoder_plugin shout_mp3_encoder;
 extern shout_encoder_plugin shout_ogg_encoder;
 
 #endif
diff --git a/src/audioOutputs/audioOutput_shout_mp3.c b/src/audioOutputs/audioOutput_shout_mp3.c
new file mode 100644
index 00000000..388808c1
--- /dev/null
+++ b/src/audioOutputs/audioOutput_shout_mp3.c
@@ -0,0 +1,194 @@
+/* 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 "../output_api.h"
+
+#ifdef HAVE_SHOUT_MP3
+
+#include "../utils.h"
+#include "audioOutput_shout.h"
+#include <lame/lame.h>
+
+typedef struct _lame_data {
+	lame_global_flags *gfp;
+} lame_data;
+
+
+static int shout_mp3_encoder_init(shout_data * sd)
+{
+	lame_data *ld;
+
+	if (NULL == (ld = xmalloc(sizeof(lame_data))))
+		FATAL("error initializing lame encoder data\n");
+	sd->encoder_data = ld;
+
+	return 0;
+}
+
+static int shout_mp3_encoder_clear_encoder(shout_data * sd)
+{
+	lame_data *ld = (lame_data *)sd->encoder_data;
+	shout_buffer *buf = &sd->buf;
+	int ret;
+
+	if ((ret = lame_encode_flush(ld->gfp, buf->data + buf->len,
+				     buf->len)) < 0)
+		ERROR("error flushing lame buffers\n");
+
+	return (ret > 0);
+}
+
+static void shout_mp3_encoder_finish(shout_data * sd)
+{
+	lame_data *ld = (lame_data *)sd->encoder_data;
+
+	lame_close(ld->gfp);
+	ld->gfp = NULL;
+}
+
+static int shout_mp3_encoder_init_encoder(shout_data * sd)
+{
+	lame_data *ld = (lame_data *)sd->encoder_data;
+
+	if (NULL == (ld->gfp = lame_init())) {
+		ERROR("error initializing lame encoder for shout\n");
+		return -1;
+	}
+
+	if (sd->quality >= -1.0) {
+		if (0 != lame_set_VBR(ld->gfp, vbr_rh)) {
+			ERROR("error setting lame VBR mode\n");
+			return -1;
+		}
+		if (0 != lame_set_VBR_q(ld->gfp, sd->quality)) {
+			ERROR("error setting lame VBR quality\n");
+			return -1;
+		}
+	} else {
+		if (0 != lame_set_brate(ld->gfp, sd->bitrate)) {
+			ERROR("error setting lame bitrate\n");
+			return -1;
+		}
+	}
+
+	if (0 != lame_set_num_channels(ld->gfp,
+				       sd->audio_format.channels)) {
+		ERROR("error setting lame num channels\n");
+		return -1;
+	}
+
+	if (0 != lame_set_in_samplerate(ld->gfp,
+					sd->audio_format.sampleRate)) {
+		ERROR("error setting lame sample rate\n");
+		return -1;
+	}
+
+	if (0 > lame_init_params(ld->gfp))
+		FATAL("error initializing lame params\n");
+
+	return 0;
+}
+
+static int shout_mp3_encoder_send_metadata(shout_data * sd,
+					   char * song, size_t size)
+{
+	char artist[size];
+	char title[size];
+	int i;
+	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(shout_data * sd,
+				    const char * chunk, size_t len)
+{
+	unsigned int i;
+	int j;
+	float (*lamebuf)[2];
+	shout_buffer *buf = &(sd->buf);
+	unsigned int samples;
+	int bytes = sd->audio_format.bits / 8;
+	lame_data *ld = (lame_data *)sd->encoder_data;
+	int bytes_out;
+
+	samples = len / (bytes * sd->audio_format.channels);
+	/* rough estimate, from lame.h */
+	lamebuf = xmalloc(sizeof(float) * (1.25 * samples + 7200));
+
+	/* this is for only 16-bit audio */
+
+	for (i = 0; i < samples; i++) {
+		for (j = 0; j < sd->audio_format.channels; j++) {
+			lamebuf[j][i] = *((const mpd_sint16 *) chunk);
+			chunk += bytes;
+		}
+	}
+
+	bytes_out = lame_encode_buffer_float(ld->gfp, lamebuf[0], lamebuf[1],
+					     samples, buf->data,
+					     buf->max_len - buf->len);
+	free(lamebuf);
+
+	if (0 > bytes_out) {
+		ERROR("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;
+}
+
+
+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,
+};
+
+#else
+
+DISABLED_SHOUT_ENCODER_PLUGIN(shout_mp3_encoder);
+
+#endif