/*
* copyright (c) 2001 Fabrice Bellard
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file mpegaudio.h
+ * @file
* mpeg audio declarations for both encoder and decoder.
*/
+#ifndef AVCODEC_MPEGAUDIO_H
+#define AVCODEC_MPEGAUDIO_H
+
+#ifndef CONFIG_FLOAT
+# define CONFIG_FLOAT 0
+#endif
+
+#include <stdint.h>
+
/* max frame size, in samples */
#define MPA_FRAME_SIZE 1152
#define MPA_DUAL 2
#define MPA_MONO 3
-/* header + layer + bitrate + freq + lsf/mpeg25 */
-#define SAME_HEADER_MASK \
- (0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
-
-/* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg
- audio decoder */
-
-#ifdef USE_HIGHPRECISION
+#ifndef FRAC_BITS
#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
#define WFRAC_BITS 16 /* fractional bits for window */
-#else
-#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */
-#define WFRAC_BITS 14 /* fractional bits for window */
#endif
-#if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
-typedef int32_t OUT_INT;
-#define OUT_MAX INT32_MAX
-#define OUT_MIN INT32_MIN
-#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31)
-#else
-typedef int16_t OUT_INT;
-#define OUT_MAX INT16_MAX
-#define OUT_MIN INT16_MIN
-#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
-#endif
+#define FRAC_ONE (1 << FRAC_BITS)
+
+#define FIX(a) ((int)((a) * FRAC_ONE))
-#if FRAC_BITS <= 15
+#if CONFIG_FLOAT
+# define INTFLOAT float
+typedef float MPA_INT;
+typedef float OUT_INT;
+#elif FRAC_BITS <= 15
+# define INTFLOAT int
typedef int16_t MPA_INT;
+typedef int16_t OUT_INT;
#else
+# define INTFLOAT int
typedef int32_t MPA_INT;
+typedef int16_t OUT_INT;
#endif
-int l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
-int mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate);
-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]);
-
-extern const uint16_t mpa_bitrate_tab[2][3][15];
-extern const uint16_t mpa_freq_tab[3];
-extern const unsigned char *alloc_tables[5];
-extern const double enwindow[512];
-extern const int sblimit_table[5];
-extern const int quant_steps[17];
-extern const int quant_bits[17];
-extern const int32_t mpa_enwindow[257];
+int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf);
-/* fast header check for resync */
-static inline int ff_mpa_check_header(uint32_t header){
- /* header */
- if ((header & 0xffe00000) != 0xffe00000)
- return -1;
- /* layer check */
- if ((header & (3<<17)) == 0)
- return -1;
- /* bit rate */
- if ((header & (0xf<<12)) == 0xf<<12)
- return -1;
- /* frequency */
- if ((header & (3<<10)) == 3<<10)
- return -1;
- return 0;
-}
+#endif /* AVCODEC_MPEGAUDIO_H */