avcodec: split mp2 encoder into float and fixed

This makes the USE_FLOATS == 0 available to the end user
More float optimizations can easily be added as well now
common code should be factored out into a common file once all
fixed point & floating point optimizations are done, this is to
avoid having to move code back and forth between files.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/Makefile

@@ -284,7 +284,9 @@ OBJS-$(CONFIG_MOVTEXT_ENCODER)         += movtextenc.o ass_split.o
 OBJS-$(CONFIG_MP1_DECODER)             += mpegaudiodec_fixed.o
 OBJS-$(CONFIG_MP1FLOAT_DECODER)        += mpegaudiodec_float.o
 OBJS-$(CONFIG_MP2_DECODER)             += mpegaudiodec_fixed.o
-OBJS-$(CONFIG_MP2_ENCODER)             += mpegaudioenc.o mpegaudio.o \
+OBJS-$(CONFIG_MP2_ENCODER)             += mpegaudioenc_float.o mpegaudio.o \
+                                          mpegaudiodata.o mpegaudiodsp_data.o
+OBJS-$(CONFIG_MP2FIXED_ENCODER)        += mpegaudioenc_fixed.o mpegaudio.o \
                                           mpegaudiodata.o mpegaudiodsp_data.o
 OBJS-$(CONFIG_MP2FLOAT_DECODER)        += mpegaudiodec_float.o
 OBJS-$(CONFIG_MP3_DECODER)             += mpegaudiodec_fixed.o

libavcodec/allcodecs.c

@@ -350,6 +350,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(MP1FLOAT,          mp1float);
     REGISTER_ENCDEC (MP2,               mp2);
     REGISTER_DECODER(MP2FLOAT,          mp2float);
+    REGISTER_ENCODER(MP2FIXED,          mp2fixed);
     REGISTER_DECODER(MP3,               mp3);
     REGISTER_DECODER(MP3FLOAT,          mp3float);
     REGISTER_DECODER(MP3ADU,            mp3adu);

libavcodec/mpegaudioenc_fixed.c

@@ -0,0 +1,41 @@
+/*
+ * The simplest mpeg audio layer 2 encoder
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "mpegaudioenc_template.c"
+
+AVCodec ff_mp2fixed_encoder = {
+    .name                  = "mp2fixed",
+    .long_name             = NULL_IF_CONFIG_SMALL("MP2 fixed point (MPEG audio layer 2)"),
+    .type                  = AVMEDIA_TYPE_AUDIO,
+    .id                    = AV_CODEC_ID_MP2,
+    .priv_data_size        = sizeof(MpegAudioContext),
+    .init                  = MPA_encode_init,
+    .encode2               = MPA_encode_frame,
+    .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+                                                            AV_SAMPLE_FMT_NONE },
+    .supported_samplerates = (const int[]){
+        44100, 48000,  32000, 22050, 24000, 16000, 0
+    },
+    .channel_layouts       = (const uint64_t[]){ AV_CH_LAYOUT_MONO,
+                                                 AV_CH_LAYOUT_STEREO,
+                                                 0 },
+    .defaults              = mp2_defaults,
+};

libavcodec/mpegaudioenc_float.c

@@ -0,0 +1,42 @@
+/*
+ * The simplest mpeg audio layer 2 encoder
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define USE_FLOATS
+#include "mpegaudioenc_template.c"
+
+AVCodec ff_mp2_encoder = {
+    .name                  = "mp2",
+    .long_name             = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
+    .type                  = AVMEDIA_TYPE_AUDIO,
+    .id                    = AV_CODEC_ID_MP2,
+    .priv_data_size        = sizeof(MpegAudioContext),
+    .init                  = MPA_encode_init,
+    .encode2               = MPA_encode_frame,
+    .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+                                                            AV_SAMPLE_FMT_NONE },
+    .supported_samplerates = (const int[]){
+        44100, 48000,  32000, 22050, 24000, 16000, 0
+    },
+    .channel_layouts       = (const uint64_t[]){ AV_CH_LAYOUT_MONO,
+                                                 AV_CH_LAYOUT_STEREO,
+                                                 0 },
+    .defaults              = mp2_defaults,
+};

libavcodec/mpegaudioenc_template.c

@@ -33,9 +33,6 @@
 #define FRAC_BITS   15   /* fractional bits for sb_samples and dct */
 #define WFRAC_BITS  14   /* fractional bits for window */
 
-/* define it to use floats in quantization (I don't like floats !) */
-#define USE_FLOATS
-
 #include "mpegaudio.h"
 #include "mpegaudiodsp.h"
 #include "mpegaudiodata.h"
@@ -780,21 +777,3 @@ static const AVCodecDefault mp2_defaults[] = {
     { NULL },
 };
 
-AVCodec ff_mp2_encoder = {
-    .name                  = "mp2",
-    .long_name             = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
-    .type                  = AVMEDIA_TYPE_AUDIO,
-    .id                    = AV_CODEC_ID_MP2,
-    .priv_data_size        = sizeof(MpegAudioContext),
-    .init                  = MPA_encode_init,
-    .encode2               = MPA_encode_frame,
-    .sample_fmts           = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
-                                                            AV_SAMPLE_FMT_NONE },
-    .supported_samplerates = (const int[]){
-        44100, 48000,  32000, 22050, 24000, 16000, 0
-    },
-    .channel_layouts       = (const uint64_t[]){ AV_CH_LAYOUT_MONO,
-                                                 AV_CH_LAYOUT_STEREO,
-                                                 0 },
-    .defaults              = mp2_defaults,
-};

libavcodec/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR  44
+#define LIBAVCODEC_VERSION_MINOR  45
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \

tests/fate/acodec.mak

@@ -68,6 +68,10 @@ FATE_ACODEC-$(call ENCDEC, MP2, MP2 MP3) += fate-acodec-mp2
 fate-acodec-mp2: FMT = mp2
 fate-acodec-mp2: CMP_SHIFT = -1924
 
+FATE_ACODEC-$(call ENCDEC, MP2FIXED MP2 , MP2 MP3) += fate-acodec-mp2fixed
+fate-acodec-mp2fixed: FMT = mp2
+fate-acodec-mp2fixed: CMP_SHIFT = -1924
+
 FATE_ACODEC-$(call ENCDEC, ALAC, MOV) += fate-acodec-alac
 fate-acodec-alac: FMT = mov
 fate-acodec-alac: CODEC = alac -compression_level 1

tests/ref/acodec/mp2fixed

@@ -0,0 +1,4 @@
+28fbc7485c7939f40368f79adccb3e3d *tests/data/fate/acodec-mp2fixed.mp2
+96130 tests/data/fate/acodec-mp2fixed.mp2
+87461bd4ce4b0e0cbbf6c43621baf261 *tests/data/fate/acodec-mp2fixed.out.wav
+stddev: 4384.26 PSNR: 23.49 MAXDIFF:52632 bytes:  1058400/  1057916