Add support for MS-GSM codec

Originally committed as revision 8039 to svn://svn.ffmpeg.org/ffmpeg/trunk

3 files changed, 70 insertions, 18 deletions

diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 0a8f529270..e0dd760dcb 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -168,6 +168,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(IMC, imc);
     REGISTER_DECODER(LIBA52, liba52);
     REGISTER_ENCDEC (LIBGSM, libgsm);
+    REGISTER_ENCDEC (LIBGSM_MS, libgsm_ms);
     REGISTER_ENCODER(LIBTHEORA, libtheora);
     REGISTER_DECODER(MACE3, mace3);
     REGISTER_DECODER(MACE6, mace6);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 931bc5ad56..ca734dba18 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -37,8 +37,8 @@ extern "C" {
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVCODEC_VERSION_INT  ((51<<16)+(33<<8)+0)
-#define LIBAVCODEC_VERSION      51.33.0
+#define LIBAVCODEC_VERSION_INT  ((51<<16)+(34<<8)+0)
+#define LIBAVCODEC_VERSION      51.34.0
 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
 
 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -227,7 +227,7 @@ enum CodecID {
     CODEC_ID_SHORTEN,
     CODEC_ID_ALAC,
     CODEC_ID_WESTWOOD_SND1,
-    CODEC_ID_GSM,
+    CODEC_ID_GSM, /* As in Berlin toast format */
     CODEC_ID_QDM2,
     CODEC_ID_COOK,
     CODEC_ID_TRUESPEECH,
@@ -239,6 +239,7 @@ enum CodecID {
     CODEC_ID_IMC,
     CODEC_ID_MUSEPACK7,
     CODEC_ID_MLP,
+    CODEC_ID_GSM_MS, /* As found in WAV */
 
     /* subtitle codecs */
     CODEC_ID_DVD_SUBTITLE= 0x17000,
@@ -2165,6 +2166,7 @@ extern AVCodec h264_encoder;
 extern AVCodec huffyuv_encoder;
 extern AVCodec jpegls_encoder;
 extern AVCodec libgsm_encoder;
+extern AVCodec libgsm_ms_encoder;
 extern AVCodec libtheora_encoder;
 extern AVCodec ljpeg_encoder;
 extern AVCodec mdec_encoder;
@@ -2242,6 +2244,7 @@ extern AVCodec interplay_dpcm_decoder;
 extern AVCodec interplay_video_decoder;
 extern AVCodec kmvc_decoder;
 extern AVCodec libgsm_decoder;
+extern AVCodec libgsm_ms_decoder;
 extern AVCodec loco_decoder;
 extern AVCodec mace3_decoder;
 extern AVCodec mace6_decoder;
diff --git a/libavcodec/libgsm.c b/libavcodec/libgsm.c
index 7cf59be7ac..86dfce575c 100644
--- a/libavcodec/libgsm.c
+++ b/libavcodec/libgsm.c
@@ -1,6 +1,7 @@
 /*
  * Interface to libgsm for gsm encoding/decoding
  * Copyright (c) 2005 Alban Bedel <albeu@free.fr>
+ * Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
  *
  * This file is part of FFmpeg.
  *
@@ -24,22 +25,35 @@
  * Interface to libgsm for gsm encoding/decoding
  */
 
+// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
+
 #include "avcodec.h"
 #include <gsm.h>
 
 // gsm.h miss some essential constants
 #define GSM_BLOCK_SIZE 33
+#define GSM_MS_BLOCK_SIZE 65
 #define GSM_FRAME_SIZE 160
 
 static int libgsm_init(AVCodecContext *avctx) {
-    if (avctx->channels > 1 || avctx->sample_rate != 8000)
+    if (avctx->channels > 1 || avctx->sample_rate != 8000 || avctx->bit_rate != 13000)
         return -1;
 
-    avctx->frame_size = GSM_FRAME_SIZE;
-    avctx->block_align = GSM_BLOCK_SIZE;
-
     avctx->priv_data = gsm_create();
 
+    switch(avctx->codec_id) {
+    case CODEC_ID_GSM:
+        avctx->frame_size = GSM_FRAME_SIZE;
+        avctx->block_align = GSM_BLOCK_SIZE;
+        break;
+    case CODEC_ID_GSM_MS: {
+        int one = 1;
+        gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
+        avctx->frame_size = 2*GSM_FRAME_SIZE;
+        avctx->block_align = GSM_MS_BLOCK_SIZE;
+        }
+    }
+
     avctx->coded_frame= avcodec_alloc_frame();
     avctx->coded_frame->key_frame= 1;
 
@@ -55,11 +69,17 @@ static int libgsm_close(AVCodecContext *avctx) {
 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;
+    if(buf_size < avctx->block_align) return 0;
+
+    switch(avctx->codec_id) {
+    case CODEC_ID_GSM:
+        gsm_encode(avctx->priv_data,data,frame);
+        break;
+    case CODEC_ID_GSM_MS:
+        gsm_encode(avctx->priv_data,data,frame);
+        gsm_encode(avctx->priv_data,((short*)data)+GSM_FRAME_SIZE,frame+32);
+    }
+    return avctx->block_align;
 }
 
 
@@ -73,16 +93,33 @@ AVCodec libgsm_encoder = {
     libgsm_close,
 };
 
+AVCodec libgsm_ms_encoder = {
+    "gsm",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_GSM_MS,
+    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;
+    if(buf_size < avctx->block_align) return 0;
+
+    switch(avctx->codec_id) {
+    case CODEC_ID_GSM:
+        if(gsm_decode(avctx->priv_data,buf,data)) return -1;
+        *data_size = GSM_FRAME_SIZE*sizeof(int16_t);
+        break;
+    case CODEC_ID_GSM_MS:
+        if(gsm_decode(avctx->priv_data,buf,data) ||
+           gsm_decode(avctx->priv_data,buf+33,((int16_t*)data)+GSM_FRAME_SIZE)) return -1;
+        *data_size = GSM_FRAME_SIZE*sizeof(int16_t)*2;
+    }
+    return avctx->block_align;
 }
 
 AVCodec libgsm_decoder = {
@@ -95,3 +132,14 @@ AVCodec libgsm_decoder = {
     libgsm_close,
     libgsm_decode_frame,
 };
+
+AVCodec libgsm_ms_decoder = {
+    "gsm_ms",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_GSM_MS,
+    0,
+    libgsm_init,
+    NULL,
+    libgsm_close,
+    libgsm_decode_frame,
+};