ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/vcr1.c

@@ -0,0 +1,133 @@
+/*
+ * ATI VCR1 codec
+ * Copyright (c) 2003 Michael Niedermayer
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * ATI VCR1 codec
+ */
+
+#include "avcodec.h"
+#include "internal.h"
+#include "libavutil/avassert.h"
+#include "libavutil/internal.h"
+
+typedef struct VCR1Context {
+    int delta[16];
+    int offset[4];
+} VCR1Context;
+
+static av_cold int vcr1_decode_init(AVCodecContext *avctx)
+{
+    avctx->pix_fmt = AV_PIX_FMT_YUV410P;
+
+    if (avctx->width % 8 || avctx->height%4) {
+        avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height);
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+static int vcr1_decode_frame(AVCodecContext *avctx, void *data,
+                             int *got_frame, AVPacket *avpkt)
+{
+    VCR1Context *const a      = avctx->priv_data;
+    AVFrame *const p          = data;
+    const uint8_t *bytestream = avpkt->data;
+    const uint8_t *bytestream_end = bytestream + avpkt->size;
+    int i, x, y, ret;
+
+    if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){
+        av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size ,  32 + avctx->height + avctx->width*avctx->height*5/8);
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+    p->pict_type = AV_PICTURE_TYPE_I;
+    p->key_frame = 1;
+
+    for (i = 0; i < 16; i++) {
+        a->delta[i] = *bytestream++;
+        bytestream++;
+    }
+
+    for (y = 0; y < avctx->height; y++) {
+        int offset;
+        uint8_t *luma = &p->data[0][y * p->linesize[0]];
+
+        if ((y & 3) == 0) {
+            uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]];
+            uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]];
+
+            av_assert0 (bytestream_end - bytestream >= 4 + avctx->width);
+
+            for (i = 0; i < 4; i++)
+                a->offset[i] = *bytestream++;
+
+            offset = a->offset[0] - a->delta[bytestream[2] & 0xF];
+            for (x = 0; x < avctx->width; x += 4) {
+                luma[0]     = offset += a->delta[bytestream[2] & 0xF];
+                luma[1]     = offset += a->delta[bytestream[2] >>  4];
+                luma[2]     = offset += a->delta[bytestream[0] & 0xF];
+                luma[3]     = offset += a->delta[bytestream[0] >>  4];
+                luma       += 4;
+
+                *cb++       = bytestream[3];
+                *cr++       = bytestream[1];
+
+                bytestream += 4;
+            }
+        } else {
+            av_assert0 (bytestream_end - bytestream >= avctx->width / 2);
+
+            offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF];
+
+            for (x = 0; x < avctx->width; x += 8) {
+                luma[0]     = offset += a->delta[bytestream[2] & 0xF];
+                luma[1]     = offset += a->delta[bytestream[2] >>  4];
+                luma[2]     = offset += a->delta[bytestream[3] & 0xF];
+                luma[3]     = offset += a->delta[bytestream[3] >>  4];
+                luma[4]     = offset += a->delta[bytestream[0] & 0xF];
+                luma[5]     = offset += a->delta[bytestream[0] >>  4];
+                luma[6]     = offset += a->delta[bytestream[1] & 0xF];
+                luma[7]     = offset += a->delta[bytestream[1] >>  4];
+                luma       += 8;
+                bytestream += 4;
+            }
+        }
+    }
+
+    *got_frame = 1;
+
+    return bytestream - avpkt->data;
+}
+
+AVCodec ff_vcr1_decoder = {
+    .name           = "vcr1",
+    .long_name      = NULL_IF_CONFIG_SMALL("ATI VCR1"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_VCR1,
+    .priv_data_size = sizeof(VCR1Context),
+    .init           = vcr1_decode_init,
+    .decode         = vcr1_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};