libgsm warper by (Alban Bedel: albeu, free fr)

Originally committed as revision 4302 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -22,6 +22,7 @@ echo "  --enable-theora          enable theora support via libtheora [default=no
 echo "  --enable-faad            enable faad support via libfaad [default=no]"
 echo "  --enable-faadbin         build faad support with runtime linking [default=no]"
 echo "  --enable-faac            enable faac support via libfaac [default=no]"
+echo "  --enable-libgsm          enable gsm support via libgsm [default=no]"
 echo "  --enable-xvid            enable xvid support via xvidcore [default=no]"
 echo "  --enable-x264            enable H.264 encoding via x264 [default=no]"
 echo "  --enable-mingw32         enable mingw32 native/cross windows compile"
@@ -158,6 +159,7 @@ dv1394="yes"
 dc1394="no"
 network="yes"
 zlib="yes"
+libgsm="no"
 mp3lame="no"
 libogg="no"
 vorbis="no"
@@ -447,6 +449,8 @@ for opt do
   ;;
   --enable-shared-pp) shared_pp="yes"
   ;;
+  --enable-libgsm) libgsm="yes"
+  ;;
   --enable-mp3lame) mp3lame="yes"
   ;;
   --enable-libogg) libogg="yes"
@@ -1123,6 +1127,7 @@ echo "AltiVec enabled  $altivec"
 fi
 echo "gprof enabled    $gprof"
 echo "zlib enabled     $zlib"
+echo "libgsm enabled   $libgsm"
 echo "mp3lame enabled  $mp3lame"
 echo "libogg enabled   $libogg"
 echo "vorbis enabled   $vorbis"
@@ -1420,6 +1425,11 @@ if test "$zlib" = "yes" ; then
   echo "CONFIG_ZLIB=yes" >> config.mak
 fi
 
+if test "$libgsm" = "yes" ; then
+  echo "#define CONFIG_LIBGSM 1" >> $TMPH
+  echo "CONFIG_LIBGSM=yes" >> config.mak
+fi
+
 if test "$mp3lame" = "yes" ; then
   echo "#define CONFIG_MP3LAME 1" >> $TMPH
   echo "CONFIG_MP3LAME=yes" >> config.mak

libavcodec/Makefile

@@ -291,6 +291,11 @@ endif
 EXTRALIBS += -logg
 endif
 
+ifeq ($(CONFIG_LIBGSM),yes)
+OBJS += libgsm.o
+EXTRALIBS += -lgsm
+endif
+
 ifeq ($(TARGET_GPROF),yes)
 CFLAGS+=-p
 LDFLAGS+=-p

libavcodec/allcodecs.c

@@ -186,6 +186,9 @@ void avcodec_register_all(void)
     register_avcodec(&x264_encoder);
 #endif //CONFIG_X264_ENCODER
 #endif
+#ifdef CONFIG_LIBGSM
+    register_avcodec(&libgsm_encoder);
+#endif //CONFIG_LIBGSM
 #endif /* CONFIG_ENCODERS */
 #ifdef CONFIG_RAWVIDEO_ENCODER
     register_avcodec(&rawvideo_encoder);
@@ -482,6 +485,9 @@ void avcodec_register_all(void)
 #ifdef CONFIG_VORBIS_DECODER
     register_avcodec(&vorbis_decoder);
 #endif
+#ifdef CONFIG_LIBGSM
+    register_avcodec(&libgsm_decoder);
+#endif //CONFIG_LIBGSM
 #endif /* CONFIG_DECODERS */
 
 #ifdef AMR_NB

libavcodec/avcodec.h

@@ -172,6 +172,7 @@ enum CodecID {
     CODEC_ID_SHORTEN,
     CODEC_ID_ALAC,
     CODEC_ID_WESTWOOD_SND1,
+    CODEC_ID_GSM,    
     
     CODEC_ID_OGGTHEORA= 0x16000, 
     
@@ -2021,6 +2022,8 @@ extern AVCodec ws_snd1_decoder;
 extern AVCodec indeo2_decoder;
 extern AVCodec vorbis_decoder;
 extern AVCodec fraps_decoder;
+extern AVCodec libgsm_encoder;
+extern AVCodec libgsm_decoder;
 
 /* pcm codecs */
 #define PCM_CODEC(id, name) \

libavcodec/libgsm.c

+/*
+ * Interface to libgsm for gsm encoding/decoding
+ * Copyright (c) 2005 Alban Bedel <albeu@free.fr>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+ 
+/**
+ * @file libgsm.c
+ * Interface to libgsm for gsm encoding/decoding
+ */
+
+#include "avcodec.h"
+#include <gsm.h>
+
+// gsm.h miss some essential constants
+#define GSM_BLOCK_SIZE 33
+#define GSM_FRAME_SIZE 160
+
+static int libgsm_init(AVCodecContext *avctx) {
+    if (avctx->channels > 1 || avctx->sample_rate != 8000)
+        return -1;
+
+    avctx->frame_size = GSM_FRAME_SIZE;
+    avctx->block_align = GSM_BLOCK_SIZE;
+
+    avctx->priv_data = gsm_create();
+    
+    avctx->coded_frame= avcodec_alloc_frame();
+    avctx->coded_frame->key_frame= 1;
+    
+    return 0;
+}
+
+static int libgsm_close(AVCodecContext *avctx) {
+    gsm_destroy(avctx->priv_data);
+    avctx->priv_data = NULL;
+    return 0;
+}
+
+static int libgsm_encode_frame(AVCodecContext *avctx,
+                               unsigned char *frame, int buf_size, void *data) {
+    // we need a full block
+    if(buf_size < GSM_BLOCK_SIZE) return 0;
+
+    gsm_encode(avctx->priv_data,data,frame);
+
+    return GSM_BLOCK_SIZE;
+}
+
+
+AVCodec libgsm_encoder = {
+    "gsm",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_GSM,
+    0,
+    libgsm_init,
+    libgsm_encode_frame,
+    libgsm_close,
+};
+
+static int libgsm_decode_frame(AVCodecContext *avctx,
+                               void *data, int *data_size,
+                               uint8_t *buf, int buf_size) {
+
+    if(buf_size < GSM_BLOCK_SIZE) return 0;
+
+    if(gsm_decode(avctx->priv_data,buf,data)) return -1;
+
+    *data_size = GSM_FRAME_SIZE*2;
+    return GSM_BLOCK_SIZE;
+}
+
+AVCodec libgsm_decoder = {
+    "gsm",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_GSM,
+    0,
+    libgsm_init,
+    NULL,
+    libgsm_close,
+    libgsm_decode_frame,
+};