LucasArts SMUSH VIMA audio decoder

Signed-off-by: Vittorio Giovara <[email protected]>

Changelog

@@ -15,6 +15,7 @@ version <next>:
 - support decoding 16-bit RLE SGI images
 - VP7 video decoder
 - LucasArts SMUSH SANM video decoder
+- LucasArts SMUSH VIMA audio decoder (ADPCM)
 
 
 version 10:

doc/general.texi

@@ -780,6 +780,8 @@ following image formats are supported:
 @item ADPCM Sound Blaster Pro 2-bit @tab @tab X
 @item ADPCM Sound Blaster Pro 2.6-bit @tab @tab X
 @item ADPCM Sound Blaster Pro 4-bit @tab @tab X
+@item ADPCM VIMA
+ @tab Used in LucasArts SMUSH animations.
 @item ADPCM Westwood Studios IMA @tab @tab X
  @tab Used in Westwood Studios games like Command and Conquer.
 @item ADPCM Yamaha @tab X @tab X

libavcodec/Makefile

@@ -514,6 +514,7 @@ OBJS-$(CONFIG_ADPCM_SBPRO_4_DECODER) += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_SWF_DECODER) += adpcm.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_SWF_ENCODER) += adpcmenc.o adpcm_data.o
 OBJS-$(CONFIG_ADPCM_THP_DECODER) += adpcm.o adpcm_data.o
+OBJS-$(CONFIG_ADPCM_VIMA_DECODER) += vima.o adpcm_data.o
 OBJS-$(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

libavcodec/allcodecs.c

@@ -415,6 +415,7 @@ void avcodec_register_all(void)
  REGISTER_DECODER(ADPCM_SBPRO_4, adpcm_sbpro_4);
  REGISTER_ENCDEC (ADPCM_SWF, adpcm_swf);
  REGISTER_DECODER(ADPCM_THP, adpcm_thp);
+ REGISTER_DECODER(ADPCM_VIMA, adpcm_vima);
  REGISTER_DECODER(ADPCM_XA, adpcm_xa);
  REGISTER_ENCDEC (ADPCM_YAMAHA, adpcm_yamaha);
 

libavcodec/avcodec.h

@@ -355,6 +355,7 @@ enum AVCodecID {
  AV_CODEC_ID_ADPCM_IMA_ISS,
  AV_CODEC_ID_ADPCM_G722,
  AV_CODEC_ID_ADPCM_IMA_APC,
+ AV_CODEC_ID_ADPCM_VIMA,
 
  /* AMR */
  AV_CODEC_ID_AMR_NB = 0x12000,

libavcodec/codec_desc.c

@@ -1729,6 +1729,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
  .long_name = NULL_IF_CONFIG_SMALL("ADPCM IMA CRYO APC"),
  .props = AV_CODEC_PROP_LOSSY,
  },
+ {
+ .id = AV_CODEC_ID_ADPCM_VIMA,
+ .type = AVMEDIA_TYPE_AUDIO,
+ .name = "adpcm_vima",
+ .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),
+ .props = AV_CODEC_PROP_LOSSY,
+ },
 
  /* AMR */
  {

libavcodec/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR 44
+#define LIBAVCODEC_VERSION_MINOR 45
 #define LIBAVCODEC_VERSION_MICRO 0
 
 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \

libavcodec/vima.c

@@ -0,0 +1,218 @@
+/*
+ * LucasArts VIMA decoder
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * LucasArts VIMA audio decoder
+ * @author Paul B Mahol
+ */
+
+#include "libavutil/channel_layout.h"
+
+#include "adpcm_data.h"
+#include "avcodec.h"
+#include "get_bits.h"
+#include "internal.h"
+
+static int predict_table_init = 0;
+static uint16_t predict_table[5786 * 2];
+
+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)
+{
+ int start_pos;
+
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+
+ if (predict_table_init)
+ return 0;
+
+ 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;
+ }
+ predict_table[dest_pos] = put;
+ }
+ }
+ predict_table_init = 1;
+
+ return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *pkt)
+{
+ GetBitContext gb;
+ AVFrame *frame = data;
+ int16_t pcm_data[2];
+ uint32_t samples;
+ int8_t channel_hint[2];
+ int ret, chan;
+ int channels = 1;
+
+ if (pkt->size < 13)
+ return AVERROR_INVALIDDATA;
+
+ if ((ret = init_get_bits8(&gb, pkt->data, pkt->size)) < 0)
+ return ret;
+
+ 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);
+ }
+
+ frame->nb_samples = samples;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+
+ for (chan = 0; chan < channels; chan++) {
+ uint16_t *dest = (uint16_t *)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 = 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;
+
+ return pkt->size;
+}
+
+AVCodec ff_adpcm_vima_decoder = {
+ .name = "adpcm_vima",
+ .long_name = NULL_IF_CONFIG_SMALL("LucasArts VIMA audio"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_ADPCM_VIMA,
+ .init = decode_init,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+};