initial commit for Id RoQ and Interplay MVE multimedia subsystems

Originally committed as revision 2195 to svn://svn.ffmpeg.org/ffmpeg/trunk

6 files changed, 767 insertions, 1 deletions

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 1d90426d76..33e8857183 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -17,7 +17,8 @@ OBJS= common.o utils.o mem.o allcodecs.o \
       mpeg12.o mpegaudiodec.o pcm.o simple_idct.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
+      vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \
+      roqvideo.o dpcm.o interplayvideo.o
 
 ifeq ($(AMR_NB),yes)
 ifeq ($(AMR_NB_FIXED),yes)
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 81f6f9626d..c687ecf5e2 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -121,11 +121,15 @@ void avcodec_register_all(void)
     register_avcodec(&cljr_decoder);
     register_avcodec(&fourxm_decoder);
     register_avcodec(&mdec_decoder);
+    register_avcodec(&roq_decoder);
+    register_avcodec(&interplay_video_decoder);
 #ifdef CONFIG_AC3
     register_avcodec(&ac3_decoder);
 #endif
     register_avcodec(&ra_144_decoder);
     register_avcodec(&ra_288_decoder);
+    register_avcodec(&roq_dpcm_decoder);
+    register_avcodec(&interplay_dpcm_decoder);
 #endif /* CONFIG_DECODERS */
 
 #ifdef AMR_NB
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 4a810013fa..26a48e4aad 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -66,6 +66,8 @@ enum CodecID {
     CODEC_ID_VCR1,
     CODEC_ID_CLJR,
     CODEC_ID_MDEC,
+    CODEC_ID_ROQ,
+    CODEC_ID_INTERPLAY_VIDEO,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE,
@@ -88,6 +90,10 @@ enum CodecID {
     /* RealAudio codecs*/
     CODEC_ID_RA_144,
     CODEC_ID_RA_288,
+
+    /* various DPCM codecs */
+    CODEC_ID_ROQ_DPCM,
+    CODEC_ID_INTERPLAY_DPCM,
 };
 
 enum CodecType {
@@ -1347,8 +1353,12 @@ extern AVCodec cljr_decoder;
 extern AVCodec ffv1_decoder;
 extern AVCodec fourxm_decoder;
 extern AVCodec mdec_decoder;
+extern AVCodec roq_decoder;
+extern AVCodec interplay_video_decoder;
 extern AVCodec ra_144_decoder;
 extern AVCodec ra_288_decoder;
+extern AVCodec roq_dpcm_decoder;
+extern AVCodec interplay_dpcm_decoder;
 
 /* pcm codecs */
 #define PCM_CODEC(id, name) \
diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c
new file mode 100644
index 0000000000..bd3ad7fd0f
--- /dev/null
+++ b/libavcodec/dpcm.c
@@ -0,0 +1,200 @@
+/*
+ * Assorted DPCM codecs
+ * 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: dpcm.c
+ * Assorted DPCM (differential pulse code modulation) audio codecs
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the specific data formats, visit:
+ *   http://www.pcisys.net/~melanson/codecs/simpleaudio.html
+ */
+
+#include "avcodec.h"
+
+typedef struct DPCMContext {
+    int channels;
+    short roq_square_array[256];
+    int last_delta[2];
+} DPCMContext;
+
+#define SATURATE_S16(x)  if (x < -32768) x = -32768; \
+  else if (x > 32767) x = 32767;
+#define SE_16BIT(x)  if (x & 0x8000) x -= 0x10000;
+#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])
+
+static int interplay_delta_table[] = {
+         0,      1,      2,      3,      4,      5,      6,      7,
+         8,      9,     10,     11,     12,     13,     14,     15,
+        16,     17,     18,     19,     20,     21,     22,     23,
+        24,     25,     26,     27,     28,     29,     30,     31,
+        32,     33,     34,     35,     36,     37,     38,     39,
+        40,     41,     42,     43,     47,     51,     56,     61,
+        66,     72,     79,     86,     94,    102,    112,    122,
+       133,    145,    158,    173,    189,    206,    225,    245,
+       267,    292,    318,    348,    379,    414,    452,    493,
+       538,    587,    640,    699,    763,    832,    908,    991,
+      1081,   1180,   1288,   1405,   1534,   1673,   1826,   1993,
+      2175,   2373,   2590,   2826,   3084,   3365,   3672,   4008,
+      4373,   4772,   5208,   5683,   6202,   6767,   7385,   8059,
+      8794,   9597,  10472,  11428,  12471,  13609,  14851,  16206,
+     17685,  19298,  21060,  22981,  25078,  27367,  29864,  32589,
+    -29973, -26728, -23186, -19322, -15105, -10503,  -5481,     -1,
+         1,      1,   5481,  10503,  15105,  19322,  23186,  26728,
+     29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298,
+    -17685, -16206, -14851, -13609, -12471, -11428, -10472,  -9597,
+     -8794,  -8059,  -7385,  -6767,  -6202,  -5683,  -5208,  -4772,
+     -4373,  -4008,  -3672,  -3365,  -3084,  -2826,  -2590,  -2373,
+     -2175,  -1993,  -1826,  -1673,  -1534,  -1405,  -1288,  -1180,
+     -1081,   -991,   -908,   -832,   -763,   -699,   -640,   -587,
+      -538,   -493,   -452,   -414,   -379,   -348,   -318,   -292,
+      -267,   -245,   -225,   -206,   -189,   -173,   -158,   -145,
+      -133,   -122,   -112,   -102,    -94,    -86,    -79,    -72,
+       -66,    -61,    -56,    -51,    -47,    -43,    -42,    -41,
+       -40,    -39,    -38,    -37,    -36,    -35,    -34,    -33,
+       -32,    -31,    -30,    -29,    -28,    -27,    -26,    -25,
+       -24,    -23,    -22,    -21,    -20,    -19,    -18,    -17,
+       -16,    -15,    -14,    -13,    -12,    -11,    -10,     -9,
+        -8,     -7,     -6,     -5,     -4,     -3,     -2,     -1
+
+};
+
+static int dpcm_decode_init(AVCodecContext *avctx)
+{
+    DPCMContext *s = avctx->priv_data;
+    int i;
+    short square;
+
+    s->channels = avctx->channels;
+
+    switch(avctx->codec->id) {
+
+    case CODEC_ID_ROQ_DPCM:
+        /* initialize square table */
+        for (i = 0; i < 128; i++) {
+            square = i * i;
+            s->roq_square_array[i] = square;
+            s->roq_square_array[i + 128] = -square;
+        }
+        break;
+
+    default:
+        break;
+    }
+
+    return 0;
+}
+
+static int dpcm_decode_frame(AVCodecContext *avctx,
+                             void *data, int *data_size,
+                             uint8_t *buf, int buf_size)
+{
+    DPCMContext *s = avctx->priv_data;
+    int in, out = 0;
+    int i;
+    int predictor[2];
+    int channel_number = 0;
+    short *output_samples = data;
+    int sequence_number;
+
+    switch(avctx->codec->id) {
+
+    case CODEC_ID_ROQ_DPCM:
+        if (s->channels == 1)
+            predictor[0] = LE_16(&buf[6]);
+        else {
+            predictor[0] = buf[7] << 8;
+            predictor[1] = buf[6] << 8;
+        }
+        SE_16BIT(predictor[0]);
+        SE_16BIT(predictor[1]);
+
+        /* decode the samples */
+        for (in = 8, out = 0; in < buf_size; in++, out++) {
+            predictor[channel_number] += s->roq_square_array[buf[in]];
+            SATURATE_S16(predictor[channel_number]);
+            output_samples[out] = predictor[channel_number];
+
+            /* toggle channel */
+            channel_number ^= s->channels - 1;
+        }
+        break;
+
+    case CODEC_ID_INTERPLAY_DPCM:
+        in = 0;
+        sequence_number = LE_16(&buf[in]);
+        in += 6;  /* skip over the stream mask and stream length */
+        if (sequence_number == 1) {
+            predictor[0] = LE_16(&buf[in]);
+            in += 2;
+            SE_16BIT(predictor[0])
+            if (s->channels == 2) {
+                predictor[1] = LE_16(&buf[in]);
+                SE_16BIT(predictor[1])
+                in += 2;
+            }
+        } else {
+            for (i = 0; i < s->channels; i++)
+                predictor[i] = s->last_delta[i];
+        }
+
+        while (in < buf_size) {
+            predictor[channel_number] += interplay_delta_table[buf[in++]];
+            SATURATE_S16(predictor[channel_number]);
+            output_samples[out++] = predictor[channel_number];
+
+            /* toggle channel */
+            channel_number ^= s->channels - 1;
+        }
+
+        /* save predictors for next round */
+        for (i = 0; i < s->channels; i++)
+            s->last_delta[i] = predictor[i];
+
+        break;
+    }
+
+    *data_size = out * sizeof(short);
+    return buf_size;
+}
+
+AVCodec roq_dpcm_decoder = {
+    "roq_dpcm",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_ROQ_DPCM,
+    sizeof(DPCMContext),
+    dpcm_decode_init,
+    NULL,
+    NULL,
+    dpcm_decode_frame,
+};
+
+AVCodec interplay_dpcm_decoder = {
+    "interplay_dpcm",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_INTERPLAY_DPCM,
+    sizeof(DPCMContext),
+    dpcm_decode_init,
+    NULL,
+    NULL,
+    dpcm_decode_frame,
+};
diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c
new file mode 100644
index 0000000000..c94f16f357
--- /dev/null
+++ b/libavcodec/interplayvideo.c
@@ -0,0 +1,145 @@
+/*
+ * Interplay MVE 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 roqvideo.c
+ * Interplay MVE Video Decoder by Mike Melanson
+ * For more information about the Interplay MVE 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"
+
+typedef struct IpvideoContext {
+
+    AVCodecContext *avctx;
+    DSPContext dsp;
+    AVFrame last_frame;
+    AVFrame current_frame;
+    int first_frame;
+    int receiving_decoding_map;
+    unsigned char *decoding_map;
+    int decoding_map_size;
+
+    unsigned char *buf;
+    int size;
+
+} IpvideoContext;
+
+static int ipvideo_decode_init(AVCodecContext *avctx)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    avctx->pix_fmt = PIX_FMT_YUV444P;
+    avctx->has_b_frames = 0;
+    dsputil_init(&s->dsp, avctx);
+
+    s->first_frame = 1;
+    s->receiving_decoding_map = 1;  /* decoding map will be received first */
+
+    /* decoding map contains 4 bits of information per 8x8 block */
+    s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
+    s->decoding_map = av_malloc(s->decoding_map_size);
+
+    return 0;
+}
+
+static int ipvideo_decode_frame(AVCodecContext *avctx,
+                                void *data, int *data_size,
+                                uint8_t *buf, int buf_size)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    if (s->receiving_decoding_map) {
+        /* receiving the decoding map on this iteration */
+        s->receiving_decoding_map = 0;
+
+        if (buf_size != s->decoding_map_size)
+            printf (" Interplay video: buf_size != decoding_map_size (%d != %d)\n",
+                buf_size, s->decoding_map_size);
+        else
+            memcpy(s->decoding_map, buf, buf_size);
+
+        *data_size = 0;
+        *(AVFrame*)data = s->last_frame;
+    } else {
+        /* receiving the compressed video data on this iteration */
+        s->receiving_decoding_map = 1;
+        s->buf = buf;
+        s->size = buf_size;
+
+        if (avctx->get_buffer(avctx, &s->current_frame)) {
+            printf ("  Interplay Video: get_buffer() failed\n");
+            return -1;
+        }
+
+//        ipvideo_decode_frame(s);
+memset(s->current_frame.data[0], 0x80, s->current_frame.linesize[0] * avctx->height);
+memset(s->current_frame.data[1], 0x80, s->current_frame.linesize[1] * avctx->height / 4);
+memset(s->current_frame.data[2], 0x80, s->current_frame.linesize[2] * avctx->height / 4);
+
+        /* release the last frame if it is allocated */
+        if (s->first_frame)
+            s->first_frame = 0;
+        else
+            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 ipvideo_decode_end(AVCodecContext *avctx)
+{
+    IpvideoContext *s = avctx->priv_data;
+
+    /* release the last frame */
+    avctx->release_buffer(avctx, &s->last_frame);
+
+    av_free(s->decoding_map);
+
+    return 0;
+}
+
+AVCodec interplay_video_decoder = {
+    "interplayvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_INTERPLAY_VIDEO,
+    sizeof(IpvideoContext),
+    ipvideo_decode_init,
+    NULL,
+    ipvideo_decode_end,
+    ipvideo_decode_frame,
+    CODEC_CAP_DR1,
+};
diff --git a/libavcodec/roqvideo.c b/libavcodec/roqvideo.c
new file mode 100644
index 0000000000..5816588c3e
--- /dev/null
+++ b/libavcodec/roqvideo.c
@@ -0,0 +1,406 @@
+/*
+ * 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 roqvideo.c
+ * Id RoQ Video Decoder by Dr. Tim Ferguson
+ * For more information about the Id RoQ format, visit:
+ *   http://www.csse.monash.edu.au/~timf/
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "dsputil.h"
+
+typedef struct {
+  unsigned char y0, y1, y2, y3, u, v;
+} roq_cell;
+
+typedef struct {
+  int idx[4];
+} roq_qcell;
+
+
+typedef struct RoqContext {
+
+    AVCodecContext *avctx;
+    DSPContext dsp;
+    AVFrame last_frame;
+    AVFrame current_frame;
+    int first_frame;
+    int y_stride;
+    int c_stride;
+
+    roq_cell cells[256];
+    roq_qcell qcells[256];
+
+    unsigned char *buf;
+    int size;
+
+} RoqContext;
+
+#define RoQ_INFO              0x1001
+#define RoQ_QUAD_CODEBOOK     0x1002
+#define RoQ_QUAD_VQ           0x1011
+#define RoQ_SOUND_MONO        0x1020
+#define RoQ_SOUND_STEREO      0x1021
+
+#define RoQ_ID_MOT              0x00
+#define RoQ_ID_FCC              0x01
+#define RoQ_ID_SLD              0x02
+#define RoQ_ID_CCC              0x03
+
+#define get_byte(in_buffer) *(in_buffer++)
+#define get_word(in_buffer) ((unsigned short)(in_buffer += 2, \
+  (in_buffer[-1] << 8 | in_buffer[-2])))
+#define get_long(in_buffer) ((unsigned long)(in_buffer += 4, \
+  (in_buffer[-1] << 24 | in_buffer[-2] << 16 | in_buffer[-3] << 8 | in_buffer[-4])))
+
+
+static void apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
+{
+    unsigned char *yptr;
+
+    yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
+    *yptr++ = cell->y0;
+    *yptr++ = cell->y1;
+    yptr += (ri->y_stride - 2);
+    *yptr++ = cell->y2;
+    *yptr++ = cell->y3;
+    ri->current_frame.data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
+    ri->current_frame.data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
+}
+
+static void apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
+{
+    unsigned long row_inc, c_row_inc;
+    register unsigned char y0, y1, u, v;
+    unsigned char *yptr, *uptr, *vptr;
+
+    yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
+    uptr = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
+    vptr = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
+
+    row_inc = ri->y_stride - 4;
+    c_row_inc = (ri->c_stride) - 2;
+    *yptr++ = y0 = cell->y0; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
+    *yptr++ = y0;
+    *yptr++ = y1 = cell->y1; *uptr++ = u; *vptr++ = v;
+    *yptr++ = y1;
+
+    yptr += row_inc;
+
+    *yptr++ = y0;
+    *yptr++ = y0;
+    *yptr++ = y1;
+    *yptr++ = y1;
+
+    yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;
+
+    *yptr++ = y0 = cell->y2; *uptr++ = u; *vptr++ = v;
+    *yptr++ = y0;
+    *yptr++ = y1 = cell->y3; *uptr++ = u; *vptr++ = v;
+    *yptr++ = y1;
+
+    yptr += row_inc;
+
+    *yptr++ = y0;
+    *yptr++ = y0;
+    *yptr++ = y1;
+    *yptr++ = y1;
+}
+
+static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
+    char mean_x, char mean_y)
+{
+    int i, mx, my;
+    unsigned char *pa, *pb;
+
+    mx = x + 8 - (mv >> 4) - mean_x;
+    my = y + 8 - (mv & 0xf) - mean_y;
+
+    pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
+    pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
+    for(i = 0; i < 4; i++) {
+        pa[0] = pb[0];
+        pa[1] = pb[1];
+        pa[2] = pb[2];
+        pa[3] = pb[3];
+        pa += ri->y_stride;
+        pb += ri->y_stride;
+    }
+
+    pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
+    pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
+    for(i = 0; i < 2; i++) {
+        pa[0] = pb[0];
+        pa[1] = pb[1];
+        pa += ri->c_stride;
+        pb += ri->c_stride;
+    }
+
+    pa = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
+    pb = ri->last_frame.data[2] + (my/2) * (ri->c_stride) + (mx + 1)/2;
+    for(i = 0; i < 2; i++) {
+        pa[0] = pb[0];
+        pa[1] = pb[1];
+        pa += ri->c_stride;
+        pb += ri->c_stride;
+    }
+}
+
+static void apply_motion_8x8(RoqContext *ri, int x, int y,
+    unsigned char mv, char mean_x, char mean_y)
+{
+    int mx, my, i;
+    unsigned char *pa, *pb;
+
+    mx = x + 8 - (mv >> 4) - mean_x;
+    my = y + 8 - (mv & 0xf) - mean_y;
+
+    pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
+    pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
+    for(i = 0; i < 8; i++) {
+        pa[0] = pb[0];
+        pa[1] = pb[1];
+        pa[2] = pb[2];
+        pa[3] = pb[3];
+        pa[4] = pb[4];
+        pa[5] = pb[5];
+        pa[6] = pb[6];
+        pa[7] = pb[7];
+        pa += ri->y_stride;
+        pb += ri->y_stride;
+    }
+
+    pa = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
+    pb = ri->last_frame.data[1] + (my/2) * (ri->c_stride) + (mx + 1)/2;
+    for(i = 0; i < 4; i++) {
+        pa[0] = pb[0];
+        pa[1] = pb[1];
+        pa[2] = pb[2];
+        pa[3] = pb[3];
+        pa += ri->c_stride;
+        pb += ri->c_stride;
+    }
+
+    pa = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
+    pb = ri->last_frame.data[2] + (my/2) * (ri->c_stride) + (mx + 1)/2;
+    for(i = 0; i < 4; i++) {
+        pa[0] = pb[0];
+        pa[1] = pb[1];
+        pa[2] = pb[2];
+        pa[3] = pb[3];
+        pa += ri->c_stride;
+        pb += ri->c_stride;
+    }
+}
+
+static void roqvideo_decode_frame(RoqContext *ri)
+{
+    unsigned int chunk_id = 0, chunk_arg = 0;
+    unsigned long chunk_size = 0;
+    int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
+    int vqid, bpos, xpos, ypos, xp, yp, x, y;
+    int frame_stats[2][4] = {{0},{0}};
+    roq_qcell *qcell;
+    unsigned char *buf = ri->buf;
+    unsigned char *buf_end = ri->buf + ri->size;
+
+    while (buf < buf_end) {
+        chunk_id = get_word(buf);
+        chunk_size = get_long(buf);
+        chunk_arg = get_word(buf);
+
+        if(chunk_id == RoQ_QUAD_VQ)
+            break;
+        if(chunk_id == RoQ_QUAD_CODEBOOK) {
+            if((nv1 = chunk_arg >> 8) == 0)
+                nv1 = 256;
+            if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
+                nv2 = 256;
+            for(i = 0; i < nv1; i++) {
+                ri->cells[i].y0 = get_byte(buf);
+                ri->cells[i].y1 = get_byte(buf);
+                ri->cells[i].y2 = get_byte(buf);
+                ri->cells[i].y3 = get_byte(buf);
+                ri->cells[i].u = get_byte(buf);
+                ri->cells[i].v = get_byte(buf);
+            }
+            for(i = 0; i < nv2; i++)
+                for(j = 0; j < 4; j++)
+                    ri->qcells[i].idx[j] = get_byte(buf);
+        }
+    }
+
+    bpos = xpos = ypos = 0;
+    while(bpos < chunk_size) {
+        for (yp = ypos; yp < ypos + 16; yp += 8)
+            for (xp = xpos; xp < xpos + 16; xp += 8) {
+                if (vqflg_pos < 0) {
+                    vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
+                    vqflg_pos = 7;
+                }
+                vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
+                frame_stats[0][vqid]++;
+                vqflg_pos--;
+
+                switch(vqid) {
+                case RoQ_ID_MOT:
+                    apply_motion_8x8(ri, xp, yp, 0, 8, 8);
+                    break;
+                case RoQ_ID_FCC:
+                    apply_motion_8x8(ri, xp, yp, buf[bpos++], chunk_arg >> 8,
+                        chunk_arg & 0xff);
+                    break;
+                case RoQ_ID_SLD:
+                    qcell = ri->qcells + buf[bpos++];
+                    apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
+                    apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
+                    apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
+                    apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
+                    break;
+                case RoQ_ID_CCC:
+                    for (k = 0; k < 4; k++) {
+                        x = xp; y = yp;
+                        if(k & 0x01) x += 4;
+                        if(k & 0x02) y += 4;
+
+                        if (vqflg_pos < 0) {
+                            vqflg = buf[bpos++];
+                            vqflg |= (buf[bpos++] << 8);
+                            vqflg_pos = 7;
+                        }
+                        vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
+                        frame_stats[1][vqid]++;
+                        vqflg_pos--;
+                        switch(vqid) {
+                        case RoQ_ID_MOT:
+                            apply_motion_4x4(ri, x, y, 0, 8, 8);
+                            break;
+                        case RoQ_ID_FCC:
+                            apply_motion_4x4(ri, x, y, buf[bpos++], 
+                                chunk_arg >> 8, chunk_arg & 0xff);
+                            break;
+                        case RoQ_ID_SLD:
+                            qcell = ri->qcells + buf[bpos++];
+                            apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
+                            apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
+                            apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
+                            apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
+                            break;
+                        case RoQ_ID_CCC:
+                            apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
+                            apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
+                            apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
+                            apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
+                            bpos += 4;
+                            break;
+                        }
+                    }
+                    break;
+                default:
+                    printf("Unknown vq code: %d\n", vqid);
+            }
+        }
+
+        xpos += 16;
+        if (xpos >= ri->avctx->width) {
+            xpos -= ri->avctx->width;
+            ypos += 16;
+        }
+        if(ypos >= ri->avctx->height)
+            break;
+    }
+}
+
+
+static int roq_decode_init(AVCodecContext *avctx)
+{
+    RoqContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    s->first_frame = 1;
+    avctx->pix_fmt = PIX_FMT_YUV420P;
+    avctx->has_b_frames = 0;
+    dsputil_init(&s->dsp, avctx);
+
+    return 0;
+}
+
+static int roq_decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            uint8_t *buf, int buf_size)
+{
+    RoqContext *s = avctx->priv_data;
+
+    *data_size = 0;
+
+    if (avctx->get_buffer(avctx, &s->current_frame)) {
+        printf ("  RoQ: get_buffer() failed\n");
+        return -1;
+    }
+    s->y_stride = s->current_frame.linesize[0];
+    s->c_stride = s->current_frame.linesize[1];
+
+    s->buf = buf;
+    s->size = buf_size;
+    roqvideo_decode_frame(s);
+
+    /* release the last frame if it is allocated */
+    if (s->first_frame)
+        s->first_frame = 0;
+    else
+        avctx->release_buffer(avctx, &s->last_frame);
+
+    /* shuffle frames */
+    s->last_frame = s->current_frame;
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->current_frame;
+
+    return buf_size;
+}
+
+static int roq_decode_end(AVCodecContext *avctx)
+{
+    RoqContext *s = avctx->priv_data;
+
+    /* release the last frame */
+    avctx->release_buffer(avctx, &s->last_frame);
+
+    return 0;
+}
+
+AVCodec roq_decoder = {
+    "roqvideo",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_ROQ,
+    sizeof(RoqContext),
+    roq_decode_init,
+    NULL,
+    roq_decode_end,
+    roq_decode_frame,
+    CODEC_CAP_DR1,
+};