making act segmenter

1 files changed, 252 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/eatgq.c b/ffmpeg/libavcodec/eatgq.c
new file mode 100644
index 0000000..cf93c06
--- /dev/null
+++ b/ffmpeg/libavcodec/eatgq.c
@@ -0,0 +1,252 @@
+/*
+ * 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
+ * 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 BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "bytestream.h"
+#include "dsputil.h"
+#include "aandcttab.h"
+#include "eaidct.h"
+#include "internal.h"
+
+typedef struct TgqContext {
+    AVCodecContext *avctx;
+    int width, height;
+    ScanTable scantable;
+    int qtable[64];
+    DECLARE_ALIGNED(16, int16_t, block)[6][64];
+    GetByteContext gb;
+} TgqContext;
+
+static av_cold int tgq_decode_init(AVCodecContext *avctx)
+{
+    TgqContext *s = avctx->priv_data;
+    uint8_t idct_permutation[64];
+    s->avctx = avctx;
+    ff_init_scantable_permutation(idct_permutation, FF_NO_IDCT_PERM);
+    ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
+    avctx->time_base = (AVRational){1, 15};
+    avctx->pix_fmt   = AV_PIX_FMT_YUV420P;
+    return 0;
+}
+
+static void tgq_decode_block(TgqContext *s, int16_t 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, int16_t (*block)[64], AVFrame *frame,
+                            int mb_x, int mb_y)
+{
+    int linesize = frame->linesize[0];
+    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;
+    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
+    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * frame->linesize[2]) + mb_x * 8;
+
+    ff_ea_idct_put_c(dest_y                   , linesize, block[0]);
+    ff_ea_idct_put_c(dest_y                + 8, linesize, block[1]);
+    ff_ea_idct_put_c(dest_y + 8 * linesize    , linesize, block[2]);
+    ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
+    if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
+         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
+         ff_ea_idct_put_c(dest_cr, 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, AVFrame *frame,
+                                   int mb_x, int mb_y, const int8_t *dc)
+{
+    int linesize = frame->linesize[0];
+    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)             + mb_x * 16;
+    uint8_t *dest_cb = frame->data[1] + (mb_y * 8  * frame->linesize[1]) + mb_x * 8;
+    uint8_t *dest_cr = frame->data[2] + (mb_y * 8  * 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, frame->linesize[1], dc[4]);
+        tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
+    }
+}
+
+static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
+{
+    int mode;
+    int i;
+    int8_t dc[6];
+
+    mode = bytestream2_get_byte(&s->gb);
+    if (mode > 12) {
+        GetBitContext gb;
+        init_get_bits(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode) * 8);
+        for (i = 0; i < 6; i++)
+            tgq_decode_block(s, s->block[i], &gb);
+        tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
+        bytestream2_skip(&s->gb, mode);
+    } else {
+        if (mode == 3) {
+            memset(dc, bytestream2_get_byte(&s->gb), 4);
+            dc[4] = bytestream2_get_byte(&s->gb);
+            dc[5] = bytestream2_get_byte(&s->gb);
+        } else if (mode == 6) {
+            bytestream2_get_buffer(&s->gb, dc, 6);
+        } else if (mode == 12) {
+            for (i = 0; i < 6; i++) {
+                dc[i] = bytestream2_get_byte(&s->gb);
+                bytestream2_skip(&s->gb, 1);
+            }
+        } else {
+            av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
+            return -1;
+        }
+        tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
+    }
+    return 0;
+}
+
+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++)
+            s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
+                                    ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
+}
+
+static int tgq_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size       = avpkt->size;
+    TgqContext *s      = avctx->priv_data;
+    AVFrame *frame     = data;
+    int x, y, ret;
+    int big_endian;
+
+    if (buf_size < 16) {
+        av_log(avctx, AV_LOG_WARNING, "truncated header\n");
+        return AVERROR_INVALIDDATA;
+    }
+    big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
+    bytestream2_init(&s->gb, buf + 8, buf_size - 8);
+    if (big_endian) {
+        s->width  = bytestream2_get_be16u(&s->gb);
+        s->height = bytestream2_get_be16u(&s->gb);
+    } else {
+        s->width  = bytestream2_get_le16u(&s->gb);
+        s->height = bytestream2_get_le16u(&s->gb);
+    }
+
+    if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
+        avcodec_set_dimensions(s->avctx, s->width, s->height);
+    }
+    tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
+    bytestream2_skip(&s->gb, 3);
+
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    frame->key_frame = 1;
+    frame->pict_type = AV_PICTURE_TYPE_I;
+
+    for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
+        for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
+            if (tgq_decode_mb(s, frame, y, x) < 0)
+                return AVERROR_INVALIDDATA;
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+AVCodec ff_eatgq_decoder = {
+    .name           = "eatgq",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_TGQ,
+    .priv_data_size = sizeof(TgqContext),
+    .init           = tgq_decode_init,
+    .decode         = tgq_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
+};