Add libwmapro to apps/codecs. These files comprise a set of unmodified files needed from ffmpeg's libavcodec and libavutil to compile and use the wma pro decoder standalone. The files were taken from ffmpeg's svn r22886 dated 15 April 2010.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25763 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 163 insertions, 0 deletions

diff --git a/apps/codecs/libwmapro/wma.h b/apps/codecs/libwmapro/wma.h
new file mode 100644
index 0000000000..11274ad970
--- /dev/null
+++ b/apps/codecs/libwmapro/wma.h
@@ -0,0 +1,163 @@
+/*
+ * 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 "get_bits.h"
+#include "put_bits.h"
+#include "dsputil.h"
+#include "fft.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 sample_rate;
+    int nb_channels;
+    int bit_rate;
+    int version;                            ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
+    int block_align;
+    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(16, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
+    float max_exponent[MAX_CHANNELS];
+    WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
+    DECLARE_ALIGNED(16, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
+    DECLARE_ALIGNED(16, 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(16, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
+    /* last frame info */
+    uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* 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)];
+    DSPContext dsp;
+
+#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 av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
+                                      unsigned int decode_flags);
+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 */