Electronic Arts TGQ video decoder

Originally committed as revision 15789 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 255 insertions, 0 deletions

diff --git a/libavcodec/eatgq.c b/libavcodec/eatgq.c
new file mode 100644
index 0000000000..b65c8a5ce6
--- /dev/null
+++ b/libavcodec/eatgq.c
@@ -0,0 +1,255 @@
+/*
+ * Electronic Arts TGQ Video Decoder
+ * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file eatgq.c
+ * Electronic Arts TGQ Video Decoder
+ * @author Peter Ross <pross@xvid.org>
+ *
+ * Technical details here:
+ * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
+ */
+
+#include "avcodec.h"
+#define ALT_BITSTREAM_READER_LE
+#include "bitstream.h"
+#include "bytestream.h"
+#include "dsputil.h"
+extern const uint16_t ff_inv_aanscales[64]; //mpegvideo_enc.c
+
+typedef struct TgqContext {
+    AVCodecContext *avctx;
+    DSPContext dsp;
+    AVFrame frame;
+    int width,height;
+    ScanTable scantable;
+    int qtable[64];
+} TgqContext;
+
+static av_cold int tgq_decode_init(AVCodecContext *avctx){
+    TgqContext *s = avctx->priv_data;
+    s->avctx = avctx;
+    if(avctx->idct_algo==FF_IDCT_AUTO)
+        avctx->idct_algo=FF_IDCT_EA;
+    dsputil_init(&s->dsp, avctx);
+    ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
+    avctx->time_base = (AVRational){1, 15};
+    avctx->pix_fmt = PIX_FMT_YUV420P;
+    return 0;
+}
+
+static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){
+    uint8_t *perm = s->scantable.permutated;
+    int i,j,value;
+    block[0] = get_sbits(gb,8) * s->qtable[0];
+    for(i=1; i<64; ) {
+        switch(show_bits(gb,3)) {
+        case 4:
+            block[perm[i++]] = 0;
+        case 0:
+            block[perm[i++]] = 0;
+            skip_bits(gb,3);
+            break;
+        case 5:
+        case 1:
+            skip_bits(gb,2);
+            value = get_bits(gb,6);
+            for(j=0; j<value; j++)
+                block[perm[i++]] = 0;
+            break;
+        case 6:
+            skip_bits(gb,3);
+            block[perm[i]] = -s->qtable[perm[i]];
+            i++;
+            break;
+        case 2:
+            skip_bits(gb,3);
+            block[perm[i]] = s->qtable[perm[i]];
+            i++;
+            break;
+        case 7: // 111b
+        case 3: // 011b
+            skip_bits(gb,2);
+            if (show_bits(gb,6)==0x3F) {
+                skip_bits(gb, 6);
+                block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]];
+            }else{
+                block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]];
+            }
+            i++;
+            break;
+        }
+    }
+    block[0] += 128<<4;
+}
+
+static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){
+    int linesize= s->frame.linesize[0];
+    uint8_t *dest_y  = s->frame.data[0] + (mb_y * 16* linesize            ) + mb_x * 16;
+    uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
+    uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
+
+    s->dsp.idct_put(dest_y                 , linesize, block[0]);
+    s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
+    s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
+    s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
+    if(!(s->avctx->flags&CODEC_FLAG_GRAY)){
+         s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]);
+         s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]);
+    }
+}
+
+static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){
+    int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4);
+    int j;
+    for(j=0;j<8;j++)
+        memset(dst+j*dst_stride, level, 8);
+}
+
+static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
+{
+    int linesize= s->frame.linesize[0];
+    uint8_t *dest_y  = s->frame.data[0] + (mb_y * 16* linesize            ) + mb_x * 16;
+    uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
+    uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
+    tgq_dconly(s,dest_y                 , linesize, dc[0]);
+    tgq_dconly(s,dest_y              + 8, linesize, dc[1]);
+    tgq_dconly(s,dest_y + 8*linesize    , linesize, dc[2]);
+    tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]);
+    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
+        tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]);
+        tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]);
+    }
+}
+
+static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const int8_t **bs, const int8_t *buf_end){
+    int mode;
+    int i;
+    int8_t dc[6];
+    DCTELEM block[6][64];
+
+    mode = bytestream_get_byte((const uint8_t**)bs);
+    if (mode>buf_end-*bs) {
+        av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n");
+        return;
+    }
+
+    if (mode>12) {
+        GetBitContext gb;
+        init_get_bits(&gb, *bs, mode*8);
+        for(i=0; i<6; i++)
+            tgq_decode_block(s, block[i], &gb);
+        tgq_idct_put_mb(s, block, mb_x, mb_y);
+    }else{
+        if (mode==3) {
+            memset(dc, (*bs)[0], 4);
+            dc[4] = (*bs)[1];
+            dc[5] = (*bs)[2];
+        }else if (mode==6) {
+            memcpy(dc, *bs, 6);
+        }else if (mode==12) {
+            for(i=0; i<6; i++)
+                dc[i] = (*bs)[i*2];
+        }else{
+            av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
+        }
+        tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
+    }
+    *bs += mode;
+}
+
+static void tgq_calculate_qtable(TgqContext *s, int quant){
+    int i,j;
+    const int a = (14*(100-quant))/100 + 1;
+    const int b = (11*(100-quant))/100 + 4;
+    for(j=0;j<8;j++)
+    for(i=0;i<8;i++)
+        if (s->avctx->idct_algo==FF_IDCT_EA)
+            s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4);
+        else
+            s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3;
+}
+
+static int tgq_decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            const uint8_t *buf, int buf_size){
+    const uint8_t *buf_start = buf;
+    const uint8_t *buf_end = buf + buf_size;
+    TgqContext *s = avctx->priv_data;
+    int x,y;
+
+    int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
+    buf += 8;
+
+    if(8>buf_end-buf) {
+        av_log(avctx, AV_LOG_WARNING, "truncated header\n");
+        return -1;
+    }
+    s->width  = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]);
+    s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]);
+
+    if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
+        avcodec_set_dimensions(s->avctx, s->width, s->height);
+        if (s->frame.data[0])
+            avctx->release_buffer(avctx, &s->frame);
+    }
+    tgq_calculate_qtable(s, buf[4]);
+    buf += 8;
+
+    if (!s->frame.data[0]) {
+        s->frame.key_frame = 1;
+        s->frame.pict_type = FF_I_TYPE;
+        s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
+        if (avctx->get_buffer(avctx, &s->frame)) {
+            av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+            return -1;
+        }
+    }
+
+    for (y=0; y<(avctx->height+15)/16; y++)
+    for (x=0; x<(avctx->width+15)/16; x++)
+        tgq_decode_mb(s, y, x, (const int8_t**)&buf, (const int8_t*)buf_end);
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+
+    return buf-buf_start;
+}
+
+static av_cold int tgq_decode_end(AVCodecContext *avctx){
+    TgqContext *s = avctx->priv_data;
+    if (s->frame.data[0])
+        s->avctx->release_buffer(avctx, &s->frame);
+    return 0;
+}
+
+AVCodec eatgq_decoder = {
+    "eatgq",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_TGQ,
+    sizeof(TgqContext),
+    tgq_decode_init,
+    NULL,
+    tgq_decode_end,
+    tgq_decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ Video"),
+};