MP3: Support decode mp3 by FFmpeg natively. (#296) (#3340)

trunk/3rdparty/ffmpeg-4-fit/libavcodec/mpegaudio.h

@@ -0,0 +1,81 @@
+/*
+ * copyright (c) 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
+ */
+
+/**
+ * @file
+ * mpeg audio declarations for both encoder and decoder.
+ */
+
+#ifndef AVCODEC_MPEGAUDIO_H
+#define AVCODEC_MPEGAUDIO_H
+
+#ifndef USE_FLOATS
+#   define USE_FLOATS 0
+#endif
+
+#include <stdint.h>
+#include "libavutil/internal.h"
+
+/* max frame size, in samples */
+#define MPA_FRAME_SIZE 1152
+
+/* max compressed frame size */
+#define MPA_MAX_CODED_FRAME_SIZE 1792
+
+#define MPA_MAX_CHANNELS 2
+
+#define SBLIMIT 32 /* number of subbands */
+
+#define MPA_STEREO  0
+#define MPA_JSTEREO 1
+#define MPA_DUAL    2
+#define MPA_MONO    3
+
+#ifndef FRAC_BITS
+#define FRAC_BITS   23   /* fractional bits for sb_samples and dct */
+#define WFRAC_BITS  16   /* fractional bits for window */
+#endif
+
+#define IMDCT_SCALAR 1.759
+
+#define FRAC_ONE    (1 << FRAC_BITS)
+
+#define FIX(a)   ((int)((a) * FRAC_ONE))
+
+#if USE_FLOATS
+#   define INTFLOAT float
+#   define SUINTFLOAT float
+typedef float MPA_INT;
+typedef float OUT_INT;
+#elif FRAC_BITS <= 15
+#   define INTFLOAT int
+#   define SUINTFLOAT SUINT
+typedef int16_t MPA_INT;
+typedef int16_t OUT_INT;
+#else
+#   define INTFLOAT int
+#   define SUINTFLOAT SUINT
+typedef int32_t MPA_INT;
+typedef int16_t OUT_INT;
+#endif
+
+int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
+
+#endif /* AVCODEC_MPEGAUDIO_H */