float based mp1/mp2/mp3 decoders.

Originally committed as revision 23095 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -192,17 +192,28 @@ OBJS-$(CONFIG_MMVIDEO_DECODER)         += mmvideo.o
 OBJS-$(CONFIG_MOTIONPIXELS_DECODER)    += motionpixels.o
 OBJS-$(CONFIG_MP1_DECODER)             += mpegaudiodec.o mpegaudiodecheader.o \
                                           mpegaudio.o mpegaudiodata.o
+OBJS-$(CONFIG_MP1FLOAT_DECODER)        += mpegaudiodec_float.o mpegaudiodecheader.o \
+                                          mpegaudio.o mpegaudiodata.o
 OBJS-$(CONFIG_MP2_DECODER)             += mpegaudiodec.o mpegaudiodecheader.o \
                                           mpegaudio.o mpegaudiodata.o
 OBJS-$(CONFIG_MP2_ENCODER)             += mpegaudioenc.o mpegaudio.o \
                                           mpegaudiodata.o
+OBJS-$(CONFIG_MP2FLOAT_DECODER)        += mpegaudiodec_float.o mpegaudiodecheader.o \
+                                          mpegaudio.o mpegaudiodata.o
 OBJS-$(CONFIG_MP3ADU_DECODER)          += mpegaudiodec.o mpegaudiodecheader.o \
                                           mpegaudio.o mpegaudiodata.o
+OBJS-$(CONFIG_MP3ADUFLOAT_DECODER)     += mpegaudiodec_float.o mpegaudiodecheader.o \
+                                          mpegaudio.o mpegaudiodata.o
 OBJS-$(CONFIG_MP3ON4_DECODER)          += mpegaudiodec.o mpegaudiodecheader.o \
                                           mpegaudio.o mpegaudiodata.o         \
                                           mpeg4audio.o
+OBJS-$(CONFIG_MP3ON4FLOAT_DECODER)     += mpegaudiodec_float.o mpegaudiodecheader.o \
+                                          mpegaudio.o mpegaudiodata.o         \
+                                          mpeg4audio.o
 OBJS-$(CONFIG_MP3_DECODER)             += mpegaudiodec.o mpegaudiodecheader.o \
                                           mpegaudio.o mpegaudiodata.o
+OBJS-$(CONFIG_MP3FLOAT_DECODER)        += mpegaudiodec_float.o mpegaudiodecheader.o \
+                                          mpegaudio.o mpegaudiodata.o
 OBJS-$(CONFIG_MPC7_DECODER)            += mpc7.o mpc.o mpegaudiodec.o      \
                                           mpegaudiodecheader.o mpegaudio.o \
                                           mpegaudiodata.o

libavcodec/allcodecs.c

@@ -232,10 +232,15 @@ void avcodec_register_all(void)
     REGISTER_DECODER (MACE6, mace6);
     REGISTER_DECODER (MLP, mlp);
     REGISTER_DECODER (MP1, mp1);
+    REGISTER_DECODER (MP1FLOAT, mp1float);
     REGISTER_ENCDEC  (MP2, mp2);
+    REGISTER_DECODER (MP2FLOAT, mp2float);
     REGISTER_DECODER (MP3, mp3);
+    REGISTER_DECODER (MP3FLOAT, mp3float);
     REGISTER_DECODER (MP3ADU, mp3adu);
+    REGISTER_DECODER (MP3ADUFLOAT, mp3adufloat);
     REGISTER_DECODER (MP3ON4, mp3on4);
+    REGISTER_DECODER (MP3ON4FLOAT, mp3on4float);
     REGISTER_DECODER (MPC7, mpc7);
     REGISTER_DECODER (MPC8, mpc8);
     REGISTER_ENCDEC  (NELLYMOSER, nellymoser);

libavcodec/mpegaudio.h

@@ -26,6 +26,10 @@
 #ifndef AVCODEC_MPEGAUDIO_H
 #define AVCODEC_MPEGAUDIO_H
 
+#ifndef CONFIG_FLOAT
+#   define CONFIG_FLOAT 0
+#endif
+
 #include "avcodec.h"
 #include "get_bits.h"
 #include "dsputil.h"
@@ -65,7 +69,10 @@
 
 #define FIX(a)   ((int)((a) * FRAC_ONE))
 
-#if CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT
+#if CONFIG_FLOAT
+typedef float OUT_INT;
+#define OUT_FMT SAMPLE_FMT_FLT
+#elif CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT
 typedef int32_t OUT_INT;
 #define OUT_MAX INT32_MAX
 #define OUT_MIN INT32_MIN
@@ -79,9 +86,14 @@ typedef int16_t OUT_INT;
 #define OUT_FMT SAMPLE_FMT_S16
 #endif
 
-#if FRAC_BITS <= 15
+#if CONFIG_FLOAT
+#   define INTFLOAT float
+typedef float MPA_INT;
+#elif FRAC_BITS <= 15
+#   define INTFLOAT int
 typedef int16_t MPA_INT;
 #else
+#   define INTFLOAT int
 typedef int32_t MPA_INT;
 #endif
 
@@ -105,7 +117,7 @@ typedef struct GranuleDef {
     int preflag;
     int short_start, long_end; /* long/short band indexes */
     uint8_t scale_factors[40];
-    int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
+    INTFLOAT sb_hybrid[SBLIMIT * 18]; /* 576 samples */
 } GranuleDef;
 
 #define MPA_DECODE_HEADER \
@@ -134,13 +146,12 @@ typedef struct MPADecodeContext {
     GetBitContext in_gb;
     DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2];
     int synth_buf_offset[MPA_MAX_CHANNELS];
-    DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
-    int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
+    DECLARE_ALIGNED(16, INTFLOAT, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT];
+    INTFLOAT mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
     GranuleDef granules[2][2]; /* Used in Layer 3 */
 #ifdef DEBUG
     int frame_count;
 #endif
-    void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g);
     int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
     int dither_state;
     int error_recognition;
@@ -161,7 +172,13 @@ void ff_mpa_synth_init(MPA_INT *window);
 void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
                          MPA_INT *window, int *dither_state,
                          OUT_INT *samples, int incr,
-                         int32_t sb_samples[SBLIMIT]);
+                         INTFLOAT sb_samples[SBLIMIT]);
+
+void ff_mpa_synth_init_float(MPA_INT *window);
+void ff_mpa_synth_filter_float(MPA_INT *synth_buf_ptr, int *synth_buf_offset,
+                         MPA_INT *window, int *dither_state,
+                         OUT_INT *samples, int incr,
+                         INTFLOAT sb_samples[SBLIMIT]);
 
 /* fast header check for resync */
 static inline int ff_mpa_check_header(uint32_t header){

libavcodec/mpegaudio_tablegen.h

@@ -37,6 +37,8 @@ static int8_t   table_4_3_exp[TABLE_4_3_SIZE];
 static uint32_t table_4_3_value[TABLE_4_3_SIZE];
 static uint32_t exp_table[512];
 static uint32_t expval_table[512][16];
+static float exp_table_float[512];
+static float expval_table_float[512][16];
 
 static void mpegaudio_tableinit(void)
 {
@@ -58,8 +60,10 @@ static void mpegaudio_tableinit(void)
         for (value = 0; value < 16; value++) {
             double f = (double)value * cbrtf(value) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5);
             expval_table[exponent][value] = llrint(f);
+            expval_table_float[exponent][value] = f;
         }
         exp_table[exponent] = expval_table[exponent][1];
+        exp_table_float[exponent] = expval_table_float[exponent][1];
     }
 }
 #endif /* CONFIG_HARDCODED_TABLES */

libavcodec/mpegaudiodec_float.c

+/*
+ * Float MPEG Audio decoder
+ * Copyright (c) 2010 Michael Niedermayer
+ *
+ * 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 CONFIG_FLOAT 1
+#include "mpegaudiodec.c"
+
+#if CONFIG_MP1FLOAT_DECODER
+AVCodec mp1float_decoder =
+{
+    "mp1float",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_MP1,
+    sizeof(MPADecodeContext),
+    decode_init,
+    NULL,
+    NULL,
+    decode_frame,
+    CODEC_CAP_PARSE_ONLY,
+    .flush= flush,
+    .long_name= NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
+};
+#endif
+#if CONFIG_MP2FLOAT_DECODER
+AVCodec mp2float_decoder =
+{
+    "mp2float",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_MP2,
+    sizeof(MPADecodeContext),
+    decode_init,
+    NULL,
+    NULL,
+    decode_frame,
+    CODEC_CAP_PARSE_ONLY,
+    .flush= flush,
+    .long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
+};
+#endif
+#if CONFIG_MP3FLOAT_DECODER
+AVCodec mp3float_decoder =
+{
+    "mp3float",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_MP3,
+    sizeof(MPADecodeContext),
+    decode_init,
+    NULL,
+    NULL,
+    decode_frame,
+    CODEC_CAP_PARSE_ONLY,
+    .flush= flush,
+    .long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
+};
+#endif
+#if CONFIG_MP3ADUFLOAT_DECODER
+AVCodec mp3adufloat_decoder =
+{
+    "mp3adufloat",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_MP3ADU,
+    sizeof(MPADecodeContext),
+    decode_init,
+    NULL,
+    NULL,
+    decode_frame_adu,
+    CODEC_CAP_PARSE_ONLY,
+    .flush= flush,
+    .long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
+};
+#endif
+#if CONFIG_MP3ON4FLOAT_DECODER
+AVCodec mp3on4float_decoder =
+{
+    "mp3on4float",
+    AVMEDIA_TYPE_AUDIO,
+    CODEC_ID_MP3ON4,
+    sizeof(MP3On4DecodeContext),
+    decode_init_mp3on4,
+    NULL,
+    decode_close_mp3on4,
+    decode_frame_mp3on4,
+    .flush= flush,
+    .long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"),
+};
+#endif