1 files changed, 85 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/ra144.h b/ffmpeg1/libavcodec/ra144.h
new file mode 100644
index 0000000..eb89398
--- /dev/null
+++ b/ffmpeg1/libavcodec/ra144.h
@@ -0,0 +1,85 @@
+/*
+ * Real Audio 1.0 (14.4K)
+ * Copyright (c) 2003 the ffmpeg project
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_RA144_H
+#define AVCODEC_RA144_H
+
+#include <stdint.h>
+#include "lpc.h"
+#include "audio_frame_queue.h"
+
+#define NBLOCKS         4       ///< number of subblocks within a block
+#define BLOCKSIZE       40      ///< subblock size in 16-bit words
+#define BUFFERSIZE      146     ///< the size of the adaptive codebook
+#define FIXED_CB_SIZE   128     ///< size of fixed codebooks
+#define FRAMESIZE       20      ///< size of encoded frame
+#define LPC_ORDER       10      ///< order of LPC filter
+
+typedef struct RA144Context {
+    AVCodecContext *avctx;
+    LPCContext lpc_ctx;
+    AudioFrameQueue afq;
+    int last_frame;
+
+    unsigned int     old_energy;        ///< previous frame energy
+
+    unsigned int     lpc_tables[2][10];
+
+    /** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
+     *  and lpc_coef[1] of the previous one. */
+    unsigned int    *lpc_coef[2];
+
+    unsigned int     lpc_refl_rms[2];
+
+    int16_t curr_block[NBLOCKS * BLOCKSIZE];
+
+    /** The current subblock padded by the last 10 values of the previous one. */
+    int16_t curr_sblock[50];
+
+    /** Adaptive codebook, its size is two units bigger to avoid a
+     *  buffer overflow. */
+    uint16_t adapt_cb[146+2];
+} RA144Context;
+
+void ff_copy_and_dup(int16_t *target, const int16_t *source, int offset);
+int ff_eval_refl(int *refl, const int16_t *coefs, AVCodecContext *avctx);
+void ff_eval_coefs(int *coefs, const int *refl);
+void ff_int_to_int16(int16_t *out, const int *inp);
+int ff_t_sqrt(unsigned int x);
+unsigned int ff_rms(const int *data);
+int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
+              int energy);
+unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
+int ff_irms(const int16_t *data);
+void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
+                           int cba_idx, int cb1_idx, int cb2_idx,
+                           int gval, int gain);
+
+extern const int16_t ff_gain_val_tab[256][3];
+extern const uint8_t ff_gain_exp_tab[256];
+extern const int8_t ff_cb1_vects[128][40];
+extern const int8_t ff_cb2_vects[128][40];
+extern const uint16_t ff_cb1_base[128];
+extern const uint16_t ff_cb2_base[128];
+extern const int16_t ff_energy_tab[32];
+extern const int16_t * const ff_lpc_refl_cb[10];
+
+#endif /* AVCODEC_RA144_H */