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authorMike Melanson <mike@multimedia.cx>2003-09-08 04:10:59 +0000
committerMike Melanson <mike@multimedia.cx>2003-09-08 04:10:59 +0000
commit9937e686fe86cc463577208d67431dabe74ad2ae (patch)
tree3ca4b5537f199c8f6c62a0e722793eaaf7cea286 /libavcodec
parent0a5f92a120118286961a28486cb2a1d96ca47627 (diff)
New fringe codecs: WC3/Xan video, Xan DPCM, DK3 & DK4 ADPCM
Originally committed as revision 2217 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
-rw-r--r--libavcodec/Makefile2
-rw-r--r--libavcodec/adpcm.c130
-rw-r--r--libavcodec/allcodecs.c4
-rw-r--r--libavcodec/avcodec.h9
-rw-r--r--libavcodec/dpcm.c57
-rw-r--r--libavcodec/xan.c605
6 files changed, 795 insertions, 12 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 33e8857183..98f66ac1e3 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -18,7 +18,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
ratecontrol.o adpcm.o eval.o dv.o error_resilience.o \
fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \
vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \
- roqvideo.o dpcm.o interplayvideo.o
+ roqvideo.o dpcm.o interplayvideo.o xan.o
ifeq ($(AMR_NB),yes)
ifeq ($(AMR_NB_FIXED),yes)
diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 45c9dd1959..a9b3195d27 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -1,6 +1,6 @@
/*
* ADPCM codecs
- * Copyright (c) 2001 Fabrice Bellard.
+ * Copyright (c) 2001-2003 The ffmpeg Project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@@ -22,11 +22,13 @@
* @file adpcm.c
* ADPCM codecs.
* First version by Francois Revol revol@free.fr
+ * Fringe ADPCM codecs (e.g., DK3 and DK4)
+ * by Mike Melanson (melanson@pcisys.net)
*
* Features and limitations:
*
* Reference documents:
- * http://www.pcisys.net/~melanson/codecs/adpcm.txt
+ * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
* http://www.geocities.com/SiliconValley/8682/aud3.txt
* http://openquicktime.sourceforge.net/plugins.htm
* XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
@@ -293,14 +295,10 @@ static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble)
sign = nibble & 8;
delta = nibble & 7;
-#if 0
- diff = step >> 3;
- if (delta & 4) diff += step;
- if (delta & 2) diff += step >> 1;
- if (delta & 1) diff += step >> 2;
-#else
- diff = ((2 * delta + 1) * step) >> 3; // no jumps
-#endif
+ /* perform direct multiplication instead of series of jumps proposed by
+ * the reference ADPCM implementation since modern CPUs can do the mults
+ * quickly enough */
+ diff = ((2 * delta + 1) * step) >> 3;
predictor = c->predictor;
if (sign) predictor -= diff;
else predictor += diff;
@@ -355,6 +353,21 @@ static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
return (short)predictor;
}
+/* DK3 ADPCM support macro */
+#define DK3_GET_NEXT_NIBBLE() \
+ if (decode_top_nibble_next) \
+ { \
+ nibble = (last_byte >> 4) & 0x0F; \
+ decode_top_nibble_next = 0; \
+ } \
+ else \
+ { \
+ last_byte = *src++; \
+ if (src >= buf + buf_size) break; \
+ nibble = last_byte & 0x0F; \
+ decode_top_nibble_next = 1; \
+ }
+
static int adpcm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
@@ -367,6 +380,12 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
uint8_t *src;
int st; /* stereo */
+ /* DK3 ADPCM accounting variables */
+ unsigned char last_byte = 0;
+ unsigned char nibble;
+ int decode_top_nibble_next = 0;
+ int diff_channel;
+
samples = data;
src = buf;
@@ -551,6 +570,94 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
src ++;
}
break;
+ case CODEC_ID_ADPCM_IMA_DK4:
+ if (buf_size > BLKSIZE) {
+ if (avctx->block_align != 0)
+ buf_size = avctx->block_align;
+ else
+ buf_size = BLKSIZE;
+ }
+ c->status[0].predictor = (src[0] | (src[1] << 8));
+ c->status[0].step_index = src[2];
+ src += 4;
+ if(c->status[0].predictor & 0x8000)
+ c->status[0].predictor -= 0x10000;
+ *samples++ = c->status[0].predictor;
+ if (st) {
+ c->status[1].predictor = (src[0] | (src[1] << 8));
+ c->status[1].step_index = src[2];
+ src += 4;
+ if(c->status[1].predictor & 0x8000)
+ c->status[1].predictor -= 0x10000;
+ *samples++ = c->status[1].predictor;
+ }
+ while (src < buf + buf_size) {
+
+ /* take care of the top nibble (always left or mono channel) */
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ (src[0] >> 4) & 0x0F);
+
+ /* take care of the bottom nibble, which is right sample for
+ * stereo, or another mono sample */
+ if (st)
+ *samples++ = adpcm_ima_expand_nibble(&c->status[1],
+ src[0] & 0x0F);
+ else
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0],
+ src[0] & 0x0F);
+
+ src++;
+ }
+ break;
+ case CODEC_ID_ADPCM_IMA_DK3:
+ if (buf_size > BLKSIZE) {
+ if (avctx->block_align != 0)
+ buf_size = avctx->block_align;
+ else
+ buf_size = BLKSIZE;
+ }
+ c->status[0].predictor = (src[10] | (src[11] << 8));
+ c->status[1].predictor = (src[12] | (src[13] << 8));
+ c->status[0].step_index = src[14];
+ c->status[1].step_index = src[15];
+ /* sign extend the predictors */
+ if(c->status[0].predictor & 0x8000)
+ c->status[0].predictor -= 0x10000;
+ if(c->status[1].predictor & 0x8000)
+ c->status[1].predictor -= 0x10000;
+ src += 16;
+ diff_channel = c->status[1].predictor;
+
+ /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
+ * the buffer is consumed */
+ while (1) {
+
+ /* for this algorithm, c->status[0] is the sum channel and
+ * c->status[1] is the diff channel */
+
+ /* process the first predictor of the sum channel */
+ DK3_GET_NEXT_NIBBLE();
+ adpcm_ima_expand_nibble(&c->status[0], nibble);
+
+ /* process the diff channel predictor */
+ DK3_GET_NEXT_NIBBLE();
+ adpcm_ima_expand_nibble(&c->status[1], nibble);
+
+ /* process the first pair of stereo PCM samples */
+ diff_channel = (diff_channel + c->status[1].predictor) / 2;
+ *samples++ = c->status[0].predictor + c->status[1].predictor;
+ *samples++ = c->status[0].predictor - c->status[1].predictor;
+
+ /* process the second predictor of the sum channel */
+ DK3_GET_NEXT_NIBBLE();
+ adpcm_ima_expand_nibble(&c->status[0], nibble);
+
+ /* process the second pair of stereo PCM samples */
+ diff_channel = (diff_channel + c->status[1].predictor) / 2;
+ *samples++ = c->status[0].predictor + c->status[1].predictor;
+ *samples++ = c->status[0].predictor - c->status[1].predictor;
+ }
+ break;
default:
*data_size = 0;
return -1;
@@ -583,8 +690,9 @@ AVCodec name ## _decoder = { \
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
#undef ADPCM_CODEC
-
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index c687ecf5e2..4e792ba081 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -123,6 +123,7 @@ void avcodec_register_all(void)
register_avcodec(&mdec_decoder);
register_avcodec(&roq_decoder);
register_avcodec(&interplay_video_decoder);
+ register_avcodec(&xan_wc3_decoder);
#ifdef CONFIG_AC3
register_avcodec(&ac3_decoder);
#endif
@@ -130,6 +131,7 @@ void avcodec_register_all(void)
register_avcodec(&ra_288_decoder);
register_avcodec(&roq_dpcm_decoder);
register_avcodec(&interplay_dpcm_decoder);
+ register_avcodec(&xan_dpcm_decoder);
#endif /* CONFIG_DECODERS */
#ifdef AMR_NB
@@ -154,6 +156,8 @@ PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
/* adpcm codecs */
PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
+PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
+PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index f877b36958..78f60ab959 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -68,6 +68,8 @@ enum CodecID {
CODEC_ID_MDEC,
CODEC_ID_ROQ,
CODEC_ID_INTERPLAY_VIDEO,
+ CODEC_ID_XAN_WC3,
+ CODEC_ID_XAN_WC4,
/* various pcm "codecs" */
CODEC_ID_PCM_S16LE,
@@ -82,6 +84,8 @@ enum CodecID {
/* various adpcm codecs */
CODEC_ID_ADPCM_IMA_QT,
CODEC_ID_ADPCM_IMA_WAV,
+ CODEC_ID_ADPCM_IMA_DK3,
+ CODEC_ID_ADPCM_IMA_DK4,
CODEC_ID_ADPCM_MS,
CODEC_ID_ADPCM_4XM,
@@ -94,6 +98,7 @@ enum CodecID {
/* various DPCM codecs */
CODEC_ID_ROQ_DPCM,
CODEC_ID_INTERPLAY_DPCM,
+ CODEC_ID_XAN_DPCM,
};
#define CODEC_ID_MPEGVIDEO CODEC_ID_MPEG1VIDEO
@@ -1356,10 +1361,12 @@ extern AVCodec fourxm_decoder;
extern AVCodec mdec_decoder;
extern AVCodec roq_decoder;
extern AVCodec interplay_video_decoder;
+extern AVCodec xan_wc3_decoder;
extern AVCodec ra_144_decoder;
extern AVCodec ra_288_decoder;
extern AVCodec roq_dpcm_decoder;
extern AVCodec interplay_dpcm_decoder;
+extern AVCodec xan_dpcm_decoder;
/* pcm codecs */
#define PCM_CODEC(id, name) \
@@ -1379,6 +1386,8 @@ PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
+PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
+PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c
index bd3ad7fd0f..958e46467d 100644
--- a/libavcodec/dpcm.c
+++ b/libavcodec/dpcm.c
@@ -21,8 +21,17 @@
* @file: dpcm.c
* Assorted DPCM (differential pulse code modulation) audio codecs
* by Mike Melanson (melanson@pcisys.net)
+ * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt)
* for more information on the specific data formats, visit:
* http://www.pcisys.net/~melanson/codecs/simpleaudio.html
+ *
+ * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files
+ * found in the Wing Commander IV computer game. These AVI files contain
+ * WAVEFORMAT headers which report the audio format as 0x01: raw PCM.
+ * Clearly incorrect. To detect Xan DPCM, you will probably have to
+ * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan'
+ * (Xan video) for its video codec. Alternately, such AVI files also contain
+ * the fourcc 'Axan' in the 'auds' chunk of the AVI header.
*/
#include "avcodec.h"
@@ -115,6 +124,9 @@ static int dpcm_decode_frame(AVCodecContext *avctx,
int channel_number = 0;
short *output_samples = data;
int sequence_number;
+ int shift[2];
+ unsigned char byte;
+ short diff;
switch(avctx->codec->id) {
@@ -171,6 +183,40 @@ static int dpcm_decode_frame(AVCodecContext *avctx,
s->last_delta[i] = predictor[i];
break;
+
+ case CODEC_ID_XAN_DPCM:
+ in = 0;
+ shift[0] = shift[1] = 4;
+ predictor[0] = LE_16(&buf[in]);
+ in += 2;
+ SE_16BIT(predictor[0]);
+ if (s->channels == 2) {
+ predictor[1] = LE_16(&buf[in]);
+ in += 2;
+ SE_16BIT(predictor[1]);
+ }
+
+ while (in < buf_size) {
+ byte = buf[in++];
+ diff = (byte & 0xFC) << 8;
+ if ((byte & 0x03) == 3)
+ shift[channel_number]++;
+ else
+ shift[channel_number] -= (2 * (byte & 3));
+ /* saturate the shifter to a lower limit of 0 */
+ if (shift[channel_number] < 0)
+ shift[channel_number] = 0;
+
+ diff >>= shift[channel_number];
+ predictor[channel_number] += diff;
+
+ SATURATE_S16(predictor[channel_number]);
+ output_samples[out++] = predictor[channel_number];
+
+ /* toggle channel */
+ channel_number ^= s->channels - 1;
+ }
+ break;
}
*data_size = out * sizeof(short);
@@ -198,3 +244,14 @@ AVCodec interplay_dpcm_decoder = {
NULL,
dpcm_decode_frame,
};
+
+AVCodec xan_dpcm_decoder = {
+ "xan_dpcm",
+ CODEC_TYPE_AUDIO,
+ CODEC_ID_XAN_DPCM,
+ sizeof(DPCMContext),
+ dpcm_decode_init,
+ NULL,
+ NULL,
+ dpcm_decode_frame,
+};
diff --git a/libavcodec/xan.c b/libavcodec/xan.c
new file mode 100644
index 0000000000..72d4e5f14f
--- /dev/null
+++ b/libavcodec/xan.c
@@ -0,0 +1,605 @@
+/*
+ * Wing Commander/Xan Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/**
+ * @file xan.c
+ * Xan video decoder for Wing Commander III & IV computer games
+ * by Mario Brito (mbrito@student.dei.uc.pt)
+ * and Mike Melanson (melanson@pcisys.net)
+ * For more information about the Xan format, visit:
+ * http://www.pcisys.net/~melanson/codecs/
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+#define PALETTE_COUNT 256
+#define PALETTE_CONTROL_SIZE ((256 * 3) + 1)
+
+typedef struct XanContext {
+
+ AVCodecContext *avctx;
+ DSPContext dsp;
+ AVFrame last_frame;
+ AVFrame current_frame;
+
+ unsigned char *buf;
+ int size;
+
+ unsigned char palette[PALETTE_COUNT * 4];
+
+ /* scratch space */
+ unsigned char *buffer1;
+ unsigned char *buffer2;
+
+} XanContext;
+
+#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
+#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
+ (((uint8_t*)(x))[2] << 16) | \
+ (((uint8_t*)(x))[1] << 8) | \
+ ((uint8_t*)(x))[0])
+
+/* RGB -> YUV conversion stuff */
+#define SCALEFACTOR 65536
+#define CENTERSAMPLE 128
+
+#define COMPUTE_Y(r, g, b) \
+ (unsigned char) \
+ ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR)
+#define COMPUTE_U(r, g, b) \
+ (unsigned char) \
+ ((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
+#define COMPUTE_V(r, g, b) \
+ (unsigned char) \
+ ((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
+
+#define Y_R (SCALEFACTOR * 0.29900)
+#define Y_G (SCALEFACTOR * 0.58700)
+#define Y_B (SCALEFACTOR * 0.11400)
+
+#define U_R (SCALEFACTOR * -0.16874)
+#define U_G (SCALEFACTOR * -0.33126)
+#define U_B (SCALEFACTOR * 0.50000)
+
+#define V_R (SCALEFACTOR * 0.50000)
+#define V_G (SCALEFACTOR * -0.41869)
+#define V_B (SCALEFACTOR * -0.08131)
+
+/*
+ * Precalculate all of the YUV tables since it requires fewer than
+ * 10 kilobytes to store them.
+ */
+static int y_r_table[256];
+static int y_g_table[256];
+static int y_b_table[256];
+
+static int u_r_table[256];
+static int u_g_table[256];
+static int u_b_table[256];
+
+static int v_r_table[256];
+static int v_g_table[256];
+static int v_b_table[256];
+
+static int xan_decode_init(AVCodecContext *avctx)
+{
+ XanContext *s = avctx->priv_data;
+ int i;
+
+ s->avctx = avctx;
+
+ if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
+ (s->avctx->extradata_size != PALETTE_CONTROL_SIZE)) {
+ printf (" WC3 Xan video: expected extradata_size of %d\n",
+ PALETTE_CONTROL_SIZE);
+ return -1;
+ }
+
+ avctx->pix_fmt = PIX_FMT_YUV444P;
+ avctx->has_b_frames = 0;
+ dsputil_init(&s->dsp, avctx);
+
+ /* initialize the RGB -> YUV tables */
+ for (i = 0; i < 256; i++) {
+ y_r_table[i] = Y_R * i;
+ y_g_table[i] = Y_G * i;
+ y_b_table[i] = Y_B * i;
+
+ u_r_table[i] = U_R * i;
+ u_g_table[i] = U_G * i;
+ u_b_table[i] = U_B * i;
+
+ v_r_table[i] = V_R * i;
+ v_g_table[i] = V_G * i;
+ v_b_table[i] = V_B * i;
+ }
+
+ s->buffer1 = av_malloc(avctx->width * avctx->height * 4);
+ s->buffer2 = av_malloc(avctx->width * avctx->height * 4);
+ if (!s->buffer1 || !s->buffer2)
+ return -1;
+
+ return 0;
+}
+
+/* This function is used in lieu of memcpy(). This decoder can not use
+ * memcpy because the memory locations often overlap and
+ * memcpy doesn't like that; it's not uncommon, for example, for
+ * dest = src+1, to turn byte A into pattern AAAAAAAA.
+ * This was originally repz movsb in Intel x86 ASM. */
+static inline void bytecopy(unsigned char *dest, unsigned char *src, int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++)
+ dest[i] = src[i];
+}
+
+static int xan_decode_method_1(unsigned char *dest, unsigned char *src)
+{
+ unsigned char byte = *src++;
+ unsigned char ival = byte + 0x16;
+ unsigned char * ptr = src + byte*2;
+ unsigned char val = ival;
+ int counter = 0;
+
+ unsigned char bits = *ptr++;
+
+ while ( val != 0x16 ) {
+ if ( (1 << counter) & bits )
+ val = src[byte + val - 0x17];
+ else
+ val = src[val - 0x17];
+
+ if ( val < 0x16 ) {
+ *dest++ = val;
+ val = ival;
+ }
+
+ if (counter++ == 7) {
+ counter = 0;
+ bits = *ptr++;
+ }
+ }
+
+ return 0;
+}
+
+static int xan_decode_method_2(unsigned char *dest, unsigned char *src)
+{
+ unsigned char opcode;
+ int size;
+ int offset;
+ int byte1, byte2, byte3;
+
+ for (;;) {
+ opcode = *src++;
+
+ if ( (opcode & 0x80) == 0 ) {
+
+ offset = *src++;
+
+ size = opcode & 3;
+ bytecopy(dest, src, size); dest += size; src += size;
+
+ size = ((opcode & 0x1c) >> 2) + 3;
+ bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size);
+ dest += size;
+
+ } else if ( (opcode & 0x40) == 0 ) {
+
+ byte1 = *src++;
+ byte2 = *src++;
+
+ size = byte1 >> 6;
+ bytecopy (dest, src, size); dest += size; src += size;
+
+ size = (opcode & 0x3f) + 4;
+ bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size);
+ dest += size;
+
+ } else if ( (opcode & 0x20) == 0 ) {
+
+ byte1 = *src++;
+ byte2 = *src++;
+ byte3 = *src++;
+
+ size = opcode & 3;
+ bytecopy (dest, src, size); dest += size; src += size;
+
+ size = byte3 + 5 + ((opcode & 0xc) << 6);
+ bytecopy (dest,
+ dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2),
+ size);
+ dest += size;
+ } else {
+ size = ((opcode & 0x1f) << 2) + 4;
+
+ if (size > 0x70)
+ break;
+
+ bytecopy (dest, src, size); dest += size; src += size;
+ }
+ }
+
+ size = opcode & 3;
+ bytecopy(dest, src, size); dest += size; src += size;
+
+ return 0;
+}
+
+static void inline xan_wc3_build_palette(XanContext *s,
+ unsigned char *palette_data)
+{
+ int i;
+ unsigned char r, g, b;
+
+ /* transform the palette passed through the palette control structure
+ * into the necessary internal format depending on colorspace */
+
+ switch (s->avctx->pix_fmt) {
+
+ case PIX_FMT_YUV444P:
+ for (i = 0; i < PALETTE_COUNT; i++) {
+ r = *palette_data++;
+ g = *palette_data++;
+ b = *palette_data++;
+ s->palette[i * 4 + 0] = COMPUTE_Y(r, g, b);
+ s->palette[i * 4 + 1] = COMPUTE_U(r, g, b);
+ s->palette[i * 4 + 2] = COMPUTE_V(r, g, b);
+ }
+ break;
+
+ default:
+ printf (" Xan WC3: Unhandled colorspace\n");
+ break;
+ }
+}
+
+static void inline xan_wc3_output_pixel_run(XanContext *s,
+ unsigned char *pixel_buffer, int x, int y, int pixel_count)
+{
+ int stride;
+ int line_inc;
+ int index;
+ int current_x;
+ int width = s->avctx->width;
+ unsigned char pixel;
+ unsigned char *y_plane;
+ unsigned char *u_plane;
+ unsigned char *v_plane;
+
+ switch (s->avctx->pix_fmt) {
+
+ case PIX_FMT_YUV444P:
+ y_plane = s->current_frame.data[0];
+ u_plane = s->current_frame.data[1];
+ v_plane = s->current_frame.data[2];
+ stride = s->current_frame.linesize[0];
+ line_inc = stride - width;
+ index = y * stride + x;
+ current_x = x;
+ while(pixel_count--) {
+ pixel = *pixel_buffer++;
+
+ y_plane[index] = s->palette[pixel * 4 + 0];
+ u_plane[index] = s->palette[pixel * 4 + 1];
+ v_plane[index] = s->palette[pixel * 4 + 2];
+
+ index++;
+ current_x++;
+ if (current_x >= width) {
+ /* reset accounting variables */
+ index += line_inc;
+ current_x = 0;
+ }
+ }
+ break;
+
+ default:
+ printf (" Xan WC3: Unhandled colorspace\n");
+ break;
+ }
+}
+
+static void inline xan_wc3_copy_pixel_run(XanContext *s,
+ int x, int y, int pixel_count, int motion_x, int motion_y)
+{
+ int stride;
+ int line_inc;
+ int curframe_index, prevframe_index;
+ int curframe_x, prevframe_x;
+ int width = s->avctx->width;
+ unsigned char *y_plane, *u_plane, *v_plane;
+ unsigned char *prev_y_plane, *prev_u_plane, *prev_v_plane;
+
+ switch (s->avctx->pix_fmt) {
+
+ case PIX_FMT_YUV444P:
+ y_plane = s->current_frame.data[0];
+ u_plane = s->current_frame.data[1];
+ v_plane = s->current_frame.data[2];
+ prev_y_plane = s->last_frame.data[0];
+ prev_u_plane = s->last_frame.data[1];
+ prev_v_plane = s->last_frame.data[2];
+ stride = s->current_frame.linesize[0];
+ line_inc = stride - width;
+ curframe_index = y * stride + x;
+ curframe_x = x;
+ prevframe_index = (y + motion_x) * stride + x + motion_x;
+ prevframe_x = x + motion_x;
+ while(pixel_count--) {
+
+ y_plane[curframe_index] = prev_y_plane[prevframe_index];
+ u_plane[curframe_index] = prev_u_plane[prevframe_index];
+ v_plane[curframe_index] = prev_v_plane[prevframe_index];
+
+ curframe_index++;
+ curframe_x++;
+ if (curframe_x >= width) {
+ /* reset accounting variables */
+ curframe_index += line_inc;
+ curframe_x = 0;
+ }
+
+ prevframe_index++;
+ prevframe_x++;
+ if (prevframe_x >= width) {
+ /* reset accounting variables */
+ prevframe_index += line_inc;
+ prevframe_x = 0;
+ }
+ }
+ break;
+
+ default:
+ printf (" Xan WC3: Unhandled colorspace\n");
+ break;
+ }
+}
+
+static void xan_wc3_decode_frame(XanContext *s) {
+
+ int width = s->avctx->width;
+ int height = s->avctx->height;
+ int total_pixels = width * height;
+ unsigned char opcode;
+ unsigned char flag = 0;
+ int size = 0;
+ int motion_x, motion_y;
+ int x, y;
+
+ unsigned char *method1_buffer = s->buffer1;
+ unsigned char *method2_buffer = s->buffer2;
+
+ /* pointers to segments inside the compressed chunk */
+ unsigned char *method1_segment;
+ unsigned char *size_segment;
+ unsigned char *vector_segment;
+ unsigned char *method2_segment;
+
+ method1_segment = s->buf + LE_16(&s->buf[0]);
+ size_segment = s->buf + LE_16(&s->buf[2]);
+ vector_segment = s->buf + LE_16(&s->buf[4]);
+ method2_segment = s->buf + LE_16(&s->buf[6]);
+
+ xan_decode_method_1(method1_buffer, method1_segment);
+ if (method2_segment[0] == 2)
+ xan_decode_method_2(method2_buffer, method2_segment + 1);
+ else
+ method2_buffer = method2_segment + 1;
+
+ /* use the decoded data segments to build the frame */
+ x = y = 0;
+ while (total_pixels) {
+
+ opcode = *method1_buffer++;
+ size = 0;
+
+ switch (opcode) {
+
+ case 0:
+ flag ^= 1;
+ continue;
+
+ case 1:
+ case 2:
+ case 3:
+ case 4:
+ case 5:
+ case 6:
+ case 7:
+ case 8:
+ size = opcode;
+ break;
+
+ case 12:
+ case 13:
+ case 14:
+ case 15:
+ case 16:
+ case 17:
+ case 18:
+ size += (opcode - 10);
+ break;
+
+ case 9:
+ case 19:
+ size = *size_segment++;
+ break;
+
+ case 10:
+ case 20:
+ size = BE_16(&size_segment[0]);
+ size_segment += 2;
+ break;
+
+ case 11:
+ case 21:
+ size = (size_segment[0] << 16) | (size_segment[1] << 8) |
+ size_segment[2];
+ size_segment += 3;
+ break;
+ }
+
+ if (opcode < 12) {
+ flag ^= 1;
+ if (flag) {
+ /* run of (size) pixels is unchanged from last frame */
+ xan_wc3_copy_pixel_run(s, x, y, size, 0, 0);
+ } else {
+ /* output a run of pixels from method2_buffer */
+ xan_wc3_output_pixel_run(s, method2_buffer, x, y, size);
+ method2_buffer += size;
+ }
+ } else {
+ /* run-based motion compensation from last frame */
+ motion_x = (*vector_segment >> 4) & 0xF;
+ motion_y = *vector_segment & 0xF;
+ vector_segment++;
+
+ /* sign extension */
+ if (motion_x & 0x8)
+ motion_x |= 0xFFFFFFF0;
+ if (motion_y & 0x8)
+ motion_y |= 0xFFFFFFF0;
+
+ /* copy a run of pixels from the previous frame */
+ xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y);
+
+ flag = 0;
+ }
+
+ /* coordinate accounting */
+ total_pixels -= size;
+ while (size) {
+ if (x + size >= width) {
+ y++;
+ size -= (width - x);
+ x = 0;
+ } else {
+ x += size;
+ size = 0;
+ }
+ }
+ }
+}
+
+static void xan_wc4_decode_frame(XanContext *s) {
+}
+
+static int xan_decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ XanContext *s = avctx->priv_data;
+ unsigned char *palette_control = avctx->extradata;
+ int keyframe = 0;
+
+ if (palette_control[0]) {
+ /* load the new palette and reset the palette control */
+ xan_wc3_build_palette(s, &palette_control[1]);
+ palette_control[0] = 0;
+ keyframe = 1;
+ }
+
+ if (avctx->get_buffer(avctx, &s->current_frame)) {
+ printf (" Interplay Video: get_buffer() failed\n");
+ return -1;
+ }
+
+ s->buf = buf;
+ s->size = buf_size;
+
+ if (avctx->codec->id == CODEC_ID_XAN_WC3) {
+// if (keyframe)
+ if (1)
+ xan_wc3_decode_frame(s);
+ else {
+ memcpy(s->current_frame.data[0], s->last_frame.data[0],
+ s->current_frame.linesize[0] * avctx->height);
+ memcpy(s->current_frame.data[1], s->last_frame.data[1],
+ s->current_frame.linesize[1] * avctx->height);
+ memcpy(s->current_frame.data[2], s->last_frame.data[2],
+ s->current_frame.linesize[2] * avctx->height);
+ }
+ } else if (avctx->codec->id == CODEC_ID_XAN_WC4)
+ xan_wc4_decode_frame(s);
+
+ /* release the last frame if it is allocated */
+ if (s->last_frame.data[0])
+ avctx->release_buffer(avctx, &s->last_frame);
+
+ /* shuffle frames */
+ s->last_frame = s->current_frame;
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = s->current_frame;
+
+ /* always report that the buffer was completely consumed */
+ return buf_size;
+}
+
+static int xan_decode_end(AVCodecContext *avctx)
+{
+ XanContext *s = avctx->priv_data;
+
+ /* release the last frame */
+ avctx->release_buffer(avctx, &s->last_frame);
+
+ av_free(s->buffer1);
+ av_free(s->buffer2);
+
+ return 0;
+}
+
+AVCodec xan_wc3_decoder = {
+ "xan_wc3",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_XAN_WC3,
+ sizeof(XanContext),
+ xan_decode_init,
+ NULL,
+ xan_decode_end,
+ xan_decode_frame,
+ CODEC_CAP_DR1,
+};
+
+/*
+AVCodec xan_wc4_decoder = {
+ "xan_wc4",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_XAN_WC4,
+ sizeof(XanContext),
+ xan_decode_init,
+ NULL,
+ xan_decode_end,
+ xan_decode_frame,
+ CODEC_CAP_DR1,
+};
+*/