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LucasArts SMUSH VIMA audio decoder 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
tags/n1.0
Paul B Mahol 14 years ago
parent
5a90e55ece
commit
b18357326c
6 changed files with 242 additions and 1 deletions
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  1. +2
    -0
      doc/general.texi
  2. +1
    -0
      libavcodec/Makefile
  3. +1
    -0
      libavcodec/allcodecs.c
  4. +1
    -0
      libavcodec/avcodec.h
  5. +1
    -1
      libavcodec/version.h
  6. +236
    -0
      libavcodec/vima.c

+ 2
- 0
doc/general.texi View File

@@ -830,6 +830,8 @@ following image formats are supported:
@item TrueHD @tab @tab X
@tab Used in HD-DVD and Blu-Ray discs.
@item TwinVQ (VQF flavor) @tab @tab X
@item VIMA
@tab Used in LucasArts SMUSH animations.
@item Vorbis @tab E @tab X
@tab A native but very primitive encoder exists.
@item WavPack @tab @tab X


+ 1
- 0
libavcodec/Makefile View File

@@ -612,6 +612,7 @@ OBJS-$(CONFIG_ADPCM_THP_DECODER) += adpcm.o adpcm_data.o
OBJS-$(CONFIG_ADPCM_XA_DECODER) += adpcm.o adpcm_data.o
OBJS-$(CONFIG_ADPCM_YAMAHA_DECODER) += adpcm.o adpcm_data.o
OBJS-$(CONFIG_ADPCM_YAMAHA_ENCODER) += adpcmenc.o adpcm_data.o
OBJS-$(CONFIG_VIMA_DECODER) += vima.o adpcm_data.o

# libavformat dependencies
OBJS-$(CONFIG_ADTS_MUXER) += mpeg4audio.o


+ 1
- 0
libavcodec/allcodecs.c View File

@@ -395,6 +395,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (ADPCM_THP, adpcm_thp);
REGISTER_DECODER (ADPCM_XA, adpcm_xa);
REGISTER_ENCDEC (ADPCM_YAMAHA, adpcm_yamaha);
REGISTER_DECODER (VIMA, vima);

/* subtitles */
REGISTER_ENCDEC (ASS, ass);


+ 1
- 0
libavcodec/avcodec.h View File

@@ -332,6 +332,7 @@ enum CodecID {
CODEC_ID_ADPCM_IMA_ISS,
CODEC_ID_ADPCM_G722,
CODEC_ID_ADPCM_IMA_APC,
CODEC_ID_VIMA = MKBETAG('V','I','M','A'),

/* AMR */
CODEC_ID_AMR_NB = 0x12000,


+ 1
- 1
libavcodec/version.h View File

@@ -27,7 +27,7 @@
*/

#define LIBAVCODEC_VERSION_MAJOR 54
#define LIBAVCODEC_VERSION_MINOR 27
#define LIBAVCODEC_VERSION_MINOR 28
#define LIBAVCODEC_VERSION_MICRO 100

#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \


+ 236
- 0
libavcodec/vima.c View File

@@ -0,0 +1,236 @@
/*
* LucasArt VIMA decoder
* Copyright (c) 2012 Paul B Mahol
*
* 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
*/

#include "libavutil/audioconvert.h"
#include "avcodec.h"
#include "get_bits.h"
#include "adpcm_data.h"

typedef struct {
AVFrame frame;
uint16_t predict_table[5786 * 2];
} VimaContext;

static const uint8_t size_table[] =
{
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
};

static const int8_t index_table1[] =
{
-1, 4, -1, 4
};

static const int8_t index_table2[] =
{
-1, -1, 2, 6, -1, -1, 2, 6
};

static const int8_t index_table3[] =
{
-1, -1, -1, -1, 1, 2, 4, 6,
-1, -1, -1, -1, 1, 2, 4, 6
};

static const int8_t index_table4[] =
{
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 2, 2, 4, 5, 6,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 2, 2, 4, 5, 6
};

static const int8_t index_table5[] =
{
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 2, 2, 2,
2, 4, 4, 4, 5, 5, 6, 6,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 2, 2, 2,
2, 4, 4, 4, 5, 5, 6, 6
};

static const int8_t index_table6[] =
{
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 6, 6, 6, 6,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 6, 6, 6, 6
};

static const int8_t* const step_index_tables[] =
{
index_table1, index_table2, index_table3,
index_table4, index_table5, index_table6
};

static av_cold int decode_init(AVCodecContext *avctx)
{
VimaContext *vima = avctx->priv_data;
int start_pos;

for (start_pos = 0; start_pos < 64; start_pos++) {
unsigned int dest_pos, table_pos;

for (table_pos = 0, dest_pos = start_pos;
table_pos < FF_ARRAY_ELEMS(ff_adpcm_step_table);
table_pos++, dest_pos += 64) {
int put = 0, count, table_value;

table_value = ff_adpcm_step_table[table_pos];
for (count = 32; count != 0; count >>= 1) {
if (start_pos & count)
put += table_value;
table_value >>= 1;
}
vima->predict_table[dest_pos] = put;
}
}

avcodec_get_frame_defaults(&vima->frame);
avctx->coded_frame = &vima->frame;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;

return 0;
}

static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *pkt)
{
GetBitContext gb;
VimaContext *vima = avctx->priv_data;
int16_t pcm_data[2];
uint32_t samples;
int8_t channel_hint[2];
int ret, chan, channels = 1;

init_get_bits(&gb, pkt->data, pkt->size * 8);

if (pkt->size < 13)
return AVERROR_INVALIDDATA;

samples = get_bits_long(&gb, 32);
if (samples == 0xffffffff) {
skip_bits_long(&gb, 32);
samples = get_bits_long(&gb, 32);
}

if (samples > pkt->size * 2)
return AVERROR_INVALIDDATA;

channel_hint[0] = get_sbits(&gb, 8);
if (channel_hint[0] & 0x80) {
channel_hint[0] = ~channel_hint[0];
channels = 2;
}
avctx->channels = channels;
avctx->channel_layout = (channels == 2) ? AV_CH_LAYOUT_STEREO :
AV_CH_LAYOUT_MONO;
pcm_data[0] = get_sbits(&gb, 16);
if (channels > 1) {
channel_hint[1] = get_sbits(&gb, 8);
pcm_data[1] = get_sbits(&gb, 16);
}

vima->frame.nb_samples = samples;
if ((ret = avctx->get_buffer(avctx, &vima->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}

for (chan = 0; chan < channels; chan++) {
uint16_t *dest = (uint16_t*)vima->frame.data[0] + chan;
int step_index = channel_hint[chan];
int output = pcm_data[chan];
int sample;

for (sample = 0; sample < samples; sample++) {
int lookup_size, lookup, highbit, lowbits;

step_index = av_clip(step_index, 0, 88);
lookup_size = size_table[step_index];
lookup = get_bits(&gb, lookup_size);
highbit = 1 << (lookup_size - 1);
lowbits = highbit - 1;

if (lookup & highbit)
lookup ^= highbit;
else
highbit = 0;

if (lookup == lowbits) {
output = get_sbits(&gb, 16);
} else {
int predict_index, diff;

predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
predict_index = av_clip(predict_index, 0, 5785);
diff = vima->predict_table[predict_index];
if (lookup)
diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
if (highbit)
diff = -diff;

output = av_clip_int16(output + diff);
}

*dest = output;
dest += channels;

step_index += step_index_tables[lookup_size - 2][lookup];
}
}

*got_frame_ptr = 1;
*(AVFrame *)data = vima->frame;

return pkt->size;
}

AVCodec ff_vima_decoder = {
.name = "vima",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_VIMA,
.priv_data_size = sizeof(VimaContext),
.init = decode_init,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),
};

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