1. ffmpeg
  2. Commit b18357326ca1522d7fb7f4276ddebfccc29ce72c
Browse code

LucasArts SMUSH VIMA audio decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Paul B Mahol authored on 2012/03/19 11:52:08
Showing 6 changed files
doc/general.texi
History View file @ b183573
... ... 
@@ -830,6 +830,8 @@ following image formats are supported:
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 @item TrueHD                 @tab     @tab  X
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     @tab Used in HD-DVD and Blu-Ray discs.
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 @item TwinVQ (VQF flavor)    @tab     @tab  X
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+@item VIMA
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+    @tab Used in LucasArts SMUSH animations.
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 @item Vorbis                 @tab  E  @tab  X
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     @tab A native but very primitive encoder exists.
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 @item WavPack                @tab     @tab  X
libavcodec/Makefile
History View file @ b183573
... ... 
@@ -612,6 +612,7 @@ OBJS-$(CONFIG_ADPCM_THP_DECODER)          += adpcm.o adpcm_data.o
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 OBJS-$(CONFIG_ADPCM_XA_DECODER)           += adpcm.o adpcm_data.o
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 OBJS-$(CONFIG_ADPCM_YAMAHA_DECODER)       += adpcm.o adpcm_data.o
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 OBJS-$(CONFIG_ADPCM_YAMAHA_ENCODER)       += adpcmenc.o adpcm_data.o
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+OBJS-$(CONFIG_VIMA_DECODER)               += vima.o adpcm_data.o
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 # libavformat dependencies
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 OBJS-$(CONFIG_ADTS_MUXER)              += mpeg4audio.o
libavcodec/allcodecs.c
History View file @ b183573
... ... 
@@ -395,6 +395,7 @@ void avcodec_register_all(void)
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     REGISTER_DECODER (ADPCM_THP, adpcm_thp);
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     REGISTER_DECODER (ADPCM_XA, adpcm_xa);
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     REGISTER_ENCDEC  (ADPCM_YAMAHA, adpcm_yamaha);
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+    REGISTER_DECODER (VIMA, vima);
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     /* subtitles */
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     REGISTER_ENCDEC  (ASS, ass);
libavcodec/avcodec.h
History View file @ b183573
... ... 
@@ -332,6 +332,7 @@ enum CodecID {
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     CODEC_ID_ADPCM_IMA_ISS,
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     CODEC_ID_ADPCM_G722,
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     CODEC_ID_ADPCM_IMA_APC,
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+    CODEC_ID_VIMA       = MKBETAG('V','I','M','A'),
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     /* AMR */
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     CODEC_ID_AMR_NB = 0x12000,
libavcodec/version.h
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... ... 
@@ -27,7 +27,7 @@
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  */
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 #define LIBAVCODEC_VERSION_MAJOR 54
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-#define LIBAVCODEC_VERSION_MINOR  27
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+#define LIBAVCODEC_VERSION_MINOR  28
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 #define LIBAVCODEC_VERSION_MICRO 100
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 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
libavcodec/vima.c
History View file @ b183573
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new file mode 100644
... ... 
@@ -0,0 +1,236 @@
0 
+/*
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+ * LucasArt VIMA decoder
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+ * Copyright (c) 2012 Paul B Mahol
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+ *
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+ * This file is part of FFmpeg.
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+ *
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+ * FFmpeg is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU Lesser General Public
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+ * License as published by the Free Software Foundation; either
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+ * version 2.1 of the License, or (at your option) any later version.
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+ *
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+ * FFmpeg is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+ * Lesser General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Lesser General Public
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+ * License along with FFmpeg; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+ */
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+
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+#include "libavutil/audioconvert.h"
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+#include "avcodec.h"
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+#include "get_bits.h"
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+#include "adpcm_data.h"
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+
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+typedef struct {
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+    AVFrame     frame;
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+    uint16_t    predict_table[5786 * 2];
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+} VimaContext;
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+
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+static const uint8_t size_table[] =
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+{
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+    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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+    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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+    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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+    5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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+    6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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+    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
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+};
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+
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+static const int8_t index_table1[] =
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+{
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+    -1, 4, -1, 4
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+};
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+
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+static const int8_t index_table2[] =
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+{
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+    -1, -1, 2, 6, -1, -1, 2, 6
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+};
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+
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+static const int8_t index_table3[] =
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+{
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+    -1, -1, -1, -1, 1, 2, 4, 6,
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+    -1, -1, -1, -1, 1, 2, 4, 6
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+};
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+
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+static const int8_t index_table4[] =
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+{
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+     1,  1,  1,  2,  2,  4,  5,  6,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+     1,  1,  1,  2,  2,  4,  5,  6
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+};
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+
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+static const int8_t index_table5[] =
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+{
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+     1,  1,  1,  1,  1,  2,  2,  2,
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+     2,  4,  4,  4,  5,  5,  6,  6,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+     1,  1,  1,  1,  1,  2,  2,  2,
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+     2,  4,  4,  4,  5,  5,  6,  6
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+};
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+
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+static const int8_t index_table6[] =
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+{
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+     1,  1,  1,  1,  1,  1,  1,  1,
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+     1,  1,  2,  2,  2,  2,  2,  2,
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+     2,  2,  4,  4,  4,  4,  4,  4,
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+     5,  5,  5,  5,  6,  6,  6,  6,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+    -1, -1, -1, -1, -1, -1, -1, -1,
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+     1,  1,  1,  1,  1,  1,  1,  1,
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+     1,  1,  2,  2,  2,  2,  2,  2,
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+     2,  2,  4,  4,  4,  4,  4,  4,
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+     5,  5,  5,  5,  6,  6,  6,  6
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+};
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+
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+static const int8_t* const step_index_tables[] =
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+{
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+    index_table1, index_table2, index_table3,
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+    index_table4, index_table5, index_table6
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+};
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+
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+static av_cold int decode_init(AVCodecContext *avctx)
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+{
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+    VimaContext *vima = avctx->priv_data;
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+    int         start_pos;
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+
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+    for (start_pos = 0; start_pos < 64; start_pos++) {
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+        unsigned int dest_pos, table_pos;
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+
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+        for (table_pos = 0, dest_pos = start_pos;
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+             table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table);
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+             table_pos++, dest_pos += 64) {
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+            int put = 0, count, table_value;
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+
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+            table_value = ff_adpcm_step_table[table_pos];
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+            for (count = 32; count != 0; count >>= 1) {
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+                if (start_pos & count)
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+                    put += table_value;
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+                table_value >>= 1;
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+            }
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+            vima->predict_table[dest_pos] = put;
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+        }
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+    }
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+
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+    avcodec_get_frame_defaults(&vima->frame);
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+    avctx->coded_frame = &vima->frame;
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+    avctx->sample_fmt  = AV_SAMPLE_FMT_S16;
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+
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+    return 0;
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+}
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+
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+static int decode_frame(AVCodecContext *avctx, void *data,
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+                        int *got_frame_ptr, AVPacket *pkt)
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+{
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+    GetBitContext  gb;
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+    VimaContext    *vima = avctx->priv_data;
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+    int16_t        pcm_data[2];
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+    uint32_t       samples;
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+    int8_t         channel_hint[2];
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+    int            ret, chan, channels = 1;
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+
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+    init_get_bits(&gb, pkt->data, pkt->size * 8);
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+
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+    if (pkt->size < 13)
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+        return AVERROR_INVALIDDATA;
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+
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+    samples = get_bits_long(&gb, 32);
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+    if (samples == 0xffffffff) {
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+        skip_bits_long(&gb, 32);
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+        samples = get_bits_long(&gb, 32);
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+    }
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+
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+    if (samples > pkt->size * 2)
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+        return AVERROR_INVALIDDATA;
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+
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+    channel_hint[0] = get_sbits(&gb, 8);
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+    if (channel_hint[0] & 0x80) {
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+        channel_hint[0] = ~channel_hint[0];
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+        channels = 2;
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+    }
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+    avctx->channels = channels;
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+    avctx->channel_layout = (channels == 2) ? AV_CH_LAYOUT_STEREO :
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+                                              AV_CH_LAYOUT_MONO;
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+    pcm_data[0] = get_sbits(&gb, 16);
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+    if (channels > 1) {
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+        channel_hint[1] = get_sbits(&gb, 8);
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+        pcm_data[1] = get_sbits(&gb, 16);
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+    }
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+
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+    vima->frame.nb_samples = samples;
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+    if ((ret = avctx->get_buffer(avctx, &vima->frame)) < 0) {
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+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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+        return ret;
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+    }
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+
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+    for (chan = 0; chan < channels; chan++) {
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+        uint16_t *dest = (uint16_t*)vima->frame.data[0] + chan;
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+        int step_index = channel_hint[chan];
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+        int output = pcm_data[chan];
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+        int sample;
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+
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+        for (sample = 0; sample < samples; sample++) {
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+            int lookup_size, lookup, highbit, lowbits;
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+
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+            step_index  = av_clip(step_index, 0, 88);
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+            lookup_size = size_table[step_index];
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+            lookup      = get_bits(&gb, lookup_size);
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+            highbit     = 1 << (lookup_size - 1);
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+            lowbits     = highbit - 1;
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+
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+            if (lookup & highbit)
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+                lookup ^= highbit;
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+            else
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+                highbit = 0;
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+
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+            if (lookup == lowbits) {
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+                output = get_sbits(&gb, 16);
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+            } else {
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+                int predict_index, diff;
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+
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+                predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
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+                predict_index = av_clip(predict_index, 0, 5785);
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+                diff          = vima->predict_table[predict_index];
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+                if (lookup)
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+                    diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
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+                if (highbit)
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+                    diff  = -diff;
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+
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+                output  = av_clip_int16(output + diff);
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+            }
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+
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+            *dest = output;
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+            dest += channels;
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+
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+            step_index += step_index_tables[lookup_size - 2][lookup];
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+        }
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+    }
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+
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+    *got_frame_ptr   = 1;
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+    *(AVFrame *)data = vima->frame;
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+
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+    return pkt->size;
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+}
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+
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+AVCodec ff_vima_decoder = {
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+    .name           = "vima",
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+    .type           = AVMEDIA_TYPE_AUDIO,
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+    .id             = CODEC_ID_VIMA,
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+    .priv_data_size = sizeof(VimaContext),
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+    .init           = decode_init,
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+    .decode         = decode_frame,
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+    .capabilities   = CODEC_CAP_DR1,
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+    .long_name      = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),
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+};