Split Musepack decoder into SV7 decoder and synth core

(for upcoming SV8 decoder)

Originally committed as revision 10905 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 80 insertions, 0 deletions

diff --git a/libavcodec/mpc.h b/libavcodec/mpc.h
new file mode 100644
index 0000000000..ce438e3af9
--- /dev/null
+++ b/libavcodec/mpc.h
@@ -0,0 +1,80 @@
+/*
+ * Musepack decoder
+ * Copyright (c) 2006 Konstantin Shishkov
+ *
+ * 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 mpc.h Musepack decoder
+ * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
+ * divided into 32 subbands.
+ */
+
+#ifndef FFMPEG_MPC_H
+#define FFMPEG_MPC_H
+
+#include "avcodec.h"
+#include "bitstream.h"
+#include "dsputil.h"
+#include "random.h"
+
+#ifdef CONFIG_MPEGAUDIO_HP
+#define USE_HIGHPRECISION
+#endif
+#include "mpegaudio.h"
+
+#include "mpcdata.h"
+
+#define BANDS            32
+#define SAMPLES_PER_BAND 36
+#define MPC_FRAME_SIZE   (BANDS * SAMPLES_PER_BAND)
+
+/** Subband structure - hold all variables for each subband */
+typedef struct {
+    int msf; ///< mid-stereo flag
+    int res[2];
+    int scfi[2];
+    int scf_idx[2][3];
+    int Q[2];
+}Band;
+
+typedef struct {
+    DSPContext dsp;
+    GetBitContext gb;
+    int IS, MSS, gapless;
+    int lastframelen;
+    int maxbands, last_max_band;
+    int last_bits_used;
+    int oldDSCF[2][BANDS];
+    Band bands[BANDS];
+    int Q[2][MPC_FRAME_SIZE];
+    int cur_frame, frames;
+    uint8_t *bits;
+    int buf_size;
+    AVRandomState rnd;
+    int frames_to_skip;
+    /* for synthesis */
+    DECLARE_ALIGNED_16(MPA_INT, synth_buf[MPA_MAX_CHANNELS][512*2]);
+    int synth_buf_offset[MPA_MAX_CHANNELS];
+    DECLARE_ALIGNED_16(int32_t, sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT]);
+} MPCContext;
+
+extern void ff_mpc_init();
+extern void ff_mpc_dequantize_and_synth(MPCContext *c, int maxband, void *dst);
+
+#endif /* FFMPEG_MPC_H */