adding ffmpeg specific version

1 files changed, 159 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/wma.h b/ffmpeg1/libavcodec/wma.h
new file mode 100644
index 0000000..c4056ec
--- /dev/null
+++ b/ffmpeg1/libavcodec/wma.h
@@ -0,0 +1,159 @@
+/*
+ * WMA compatible codec
+ * Copyright (c) 2002-2007 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_WMA_H
+#define AVCODEC_WMA_H
+
+#include "libavutil/float_dsp.h"
+#include "get_bits.h"
+#include "put_bits.h"
+#include "fft.h"
+#include "fmtconvert.h"
+
+/* size of blocks */
+#define BLOCK_MIN_BITS 7
+#define BLOCK_MAX_BITS 11
+#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
+
+#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
+
+/* XXX: find exact max size */
+#define HIGH_BAND_MAX_SIZE 16
+
+#define NB_LSP_COEFS 10
+
+/* XXX: is it a suitable value ? */
+#define MAX_CODED_SUPERFRAME_SIZE 16384
+
+#define MAX_CHANNELS 2
+
+#define NOISE_TAB_SIZE 8192
+
+#define LSP_POW_BITS 7
+
+//FIXME should be in wmadec
+#define VLCBITS 9
+#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
+
+typedef float WMACoef;          ///< type for decoded coefficients, int16_t would be enough for wma 1/2
+
+typedef struct CoefVLCTable {
+    int n;                      ///< total number of codes
+    int max_level;
+    const uint32_t *huffcodes;  ///< VLC bit values
+    const uint8_t *huffbits;    ///< VLC bit size
+    const uint16_t *levels;     ///< table to build run/level tables
+} CoefVLCTable;
+
+typedef struct WMACodecContext {
+    AVCodecContext* avctx;
+    GetBitContext gb;
+    PutBitContext pb;
+    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
+    int use_bit_reservoir;
+    int use_variable_block_len;
+    int use_exp_vlc;                        ///< exponent coding: 0 = lsp, 1 = vlc + delta
+    int use_noise_coding;                   ///< true if perceptual noise is added
+    int byte_offset_bits;
+    VLC exp_vlc;
+    int exponent_sizes[BLOCK_NB_SIZES];
+    uint16_t exponent_bands[BLOCK_NB_SIZES][25];
+    int high_band_start[BLOCK_NB_SIZES];    ///< index of first coef in high band
+    int coefs_start;                        ///< first coded coef
+    int coefs_end[BLOCK_NB_SIZES];          ///< max number of coded coefficients
+    int exponent_high_sizes[BLOCK_NB_SIZES];
+    int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
+    VLC hgain_vlc;
+
+    /* coded values in high bands */
+    int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
+    int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
+
+    /* there are two possible tables for spectral coefficients */
+//FIXME the following 3 tables should be shared between decoders
+    VLC coef_vlc[2];
+    uint16_t *run_table[2];
+    float *level_table[2];
+    uint16_t *int_table[2];
+    const CoefVLCTable *coef_vlcs[2];
+    /* frame info */
+    int frame_len;                          ///< frame length in samples
+    int frame_len_bits;                     ///< frame_len = 1 << frame_len_bits
+    int nb_block_sizes;                     ///< number of block sizes
+    /* block info */
+    int reset_block_lengths;
+    int block_len_bits;                     ///< log2 of current block length
+    int next_block_len_bits;                ///< log2 of next block length
+    int prev_block_len_bits;                ///< log2 of prev block length
+    int block_len;                          ///< block length in samples
+    int block_num;                          ///< block number in current frame
+    int block_pos;                          ///< current position in frame
+    uint8_t ms_stereo;                      ///< true if mid/side stereo mode
+    uint8_t channel_coded[MAX_CHANNELS];    ///< true if channel is coded
+    int exponents_bsize[MAX_CHANNELS];      ///< log2 ratio frame/exp. length
+    DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
+    float max_exponent[MAX_CHANNELS];
+    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
+    DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
+    DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2];
+    FFTContext mdct_ctx[BLOCK_NB_SIZES];
+    float *windows[BLOCK_NB_SIZES];
+    /* output buffer for one frame and the last for IMDCT windowing */
+    DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
+    /* last frame info */
+    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */
+    int last_bitoffset;
+    int last_superframe_len;
+    float noise_table[NOISE_TAB_SIZE];
+    int noise_index;
+    float noise_mult; /* XXX: suppress that and integrate it in the noise array */
+    /* lsp_to_curve tables */
+    float lsp_cos_table[BLOCK_MAX_SIZE];
+    float lsp_pow_e_table[256];
+    float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
+    float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
+    FmtConvertContext fmt_conv;
+    AVFloatDSPContext fdsp;
+
+#ifdef TRACE
+    int frame_count;
+#endif
+} WMACodecContext;
+
+extern const uint16_t ff_wma_critical_freqs[25];
+extern const uint16_t ff_wma_hgain_huffcodes[37];
+extern const uint8_t ff_wma_hgain_huffbits[37];
+extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
+extern const uint32_t ff_aac_scalefactor_code[121];
+extern const uint8_t  ff_aac_scalefactor_bits[121];
+
+int ff_wma_init(AVCodecContext * avctx, int flags2);
+int ff_wma_total_gain_to_bits(int total_gain);
+int ff_wma_end(AVCodecContext *avctx);
+unsigned int ff_wma_get_large_val(GetBitContext* gb);
+int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
+                            VLC *vlc,
+                            const float *level_table, const uint16_t *run_table,
+                            int version, WMACoef *ptr, int offset,
+                            int num_coefs, int block_len, int frame_len_bits,
+                            int coef_nb_bits);
+
+#endif /* AVCODEC_WMA_H */