making act segmenter

1 files changed, 236 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/eacmv.c b/ffmpeg/libavcodec/eacmv.c
new file mode 100644
index 0000000..4e96c1a
--- /dev/null
+++ b/ffmpeg/libavcodec/eacmv.c
@@ -0,0 +1,236 @@
+/*
+ * Electronic Arts CMV Video Decoder
+ * Copyright (c) 2007-2008 Peter Ross
+ *
+ * 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 CMV Video Decoder
+ * by Peter Ross (pross@xvid.org)
+ *
+ * Technical details here:
+ * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
+ */
+
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "internal.h"
+
+typedef struct CmvContext {
+    AVCodecContext *avctx;
+    AVFrame *last_frame;   ///< last
+    AVFrame *last2_frame;  ///< second-last
+    int width, height;
+    unsigned int palette[AVPALETTE_COUNT];
+} CmvContext;
+
+static av_cold int cmv_decode_init(AVCodecContext *avctx){
+    CmvContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    s->last_frame  = av_frame_alloc();
+    s->last2_frame = av_frame_alloc();
+    if (!s->last_frame || !s->last2_frame) {
+        av_frame_free(&s->last_frame);
+        av_frame_free(&s->last2_frame);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static void cmv_decode_intra(CmvContext * s, AVFrame *frame,
+                             const uint8_t *buf, const uint8_t *buf_end)
+{
+    unsigned char *dst = frame->data[0];
+    int i;
+
+    for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
+        memcpy(dst, buf, s->avctx->width);
+        dst += frame->linesize[0];
+        buf += s->avctx->width;
+    }
+}
+
+static void cmv_motcomp(unsigned char *dst, int dst_stride,
+                        const unsigned char *src, int src_stride,
+                        int x, int y,
+                        int xoffset, int yoffset,
+                        int width, int height){
+    int i,j;
+
+    for(j=y;j<y+4;j++)
+    for(i=x;i<x+4;i++)
+    {
+        if (i+xoffset>=0 && i+xoffset<width &&
+            j+yoffset>=0 && j+yoffset<height) {
+            dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
+        }else{
+            dst[j*dst_stride + i] = 0;
+        }
+    }
+}
+
+static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
+                             const uint8_t *buf_end)
+{
+    const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
+    int x,y,i;
+
+    i = 0;
+    for(y=0; y<s->avctx->height/4; y++)
+    for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
+        if (buf[i]==0xFF) {
+            unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
+            if (raw+16<buf_end && *raw==0xFF) { /* intra */
+                raw++;
+                memcpy(dst, raw, 4);
+                memcpy(dst +     frame->linesize[0], raw+4, 4);
+                memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
+                memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
+                raw+=16;
+            }else if(raw<buf_end) {  /* inter using second-last frame as reference */
+                int xoffset = (*raw & 0xF) - 7;
+                int yoffset = ((*raw >> 4)) - 7;
+                if (s->last2_frame->data[0])
+                    cmv_motcomp(frame->data[0], frame->linesize[0],
+                                s->last2_frame->data[0], s->last2_frame->linesize[0],
+                                x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
+                raw++;
+            }
+        }else{  /* inter using last frame as reference */
+            int xoffset = (buf[i] & 0xF) - 7;
+            int yoffset = ((buf[i] >> 4)) - 7;
+            if (s->last_frame->data[0])
+                cmv_motcomp(frame->data[0], frame->linesize[0],
+                          s->last_frame->data[0], s->last_frame->linesize[0],
+                          x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
+        }
+        i++;
+    }
+}
+
+static void cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
+{
+    int pal_start, pal_count, i;
+
+    if(buf_end - buf < 16) {
+        av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
+        return;
+    }
+
+    s->width  = AV_RL16(&buf[4]);
+    s->height = AV_RL16(&buf[6]);
+    if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
+        avcodec_set_dimensions(s->avctx, s->width, s->height);
+        av_frame_unref(s->last_frame);
+        av_frame_unref(s->last2_frame);
+    }
+
+    s->avctx->time_base.num = 1;
+    s->avctx->time_base.den = AV_RL16(&buf[10]);
+
+    pal_start = AV_RL16(&buf[12]);
+    pal_count = AV_RL16(&buf[14]);
+
+    buf += 16;
+    for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
+        s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
+        buf += 3;
+    }
+}
+
+#define EA_PREAMBLE_SIZE 8
+#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
+
+static int cmv_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    CmvContext *s = avctx->priv_data;
+    const uint8_t *buf_end = buf + buf_size;
+    AVFrame *frame = data;
+    int ret;
+
+    if (buf_end - buf < EA_PREAMBLE_SIZE)
+        return AVERROR_INVALIDDATA;
+
+    if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
+        unsigned size = AV_RL32(buf + 4);
+        cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
+        if (size > buf_end - buf - EA_PREAMBLE_SIZE)
+            return -1;
+        buf += size;
+    }
+
+    if (av_image_check_size(s->width, s->height, 0, s->avctx))
+        return -1;
+
+    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+
+    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
+
+    buf += EA_PREAMBLE_SIZE;
+    if ((buf[0]&1)) {  // subtype
+        cmv_decode_inter(s, frame, buf+2, buf_end);
+        frame->key_frame = 0;
+        frame->pict_type = AV_PICTURE_TYPE_P;
+    }else{
+        frame->key_frame = 1;
+        frame->pict_type = AV_PICTURE_TYPE_I;
+        cmv_decode_intra(s, frame, buf+2, buf_end);
+    }
+
+    av_frame_unref(s->last2_frame);
+    av_frame_move_ref(s->last2_frame, s->last_frame);
+    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+static av_cold int cmv_decode_end(AVCodecContext *avctx){
+    CmvContext *s = avctx->priv_data;
+
+    av_frame_free(&s->last_frame);
+    av_frame_free(&s->last2_frame);
+
+    return 0;
+}
+
+AVCodec ff_eacmv_decoder = {
+    .name           = "eacmv",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_CMV,
+    .priv_data_size = sizeof(CmvContext),
+    .init           = cmv_decode_init,
+    .close          = cmv_decode_end,
+    .decode         = cmv_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
+};