adding ffmpeg specific version

1 files changed, 312 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/loco.c b/ffmpeg1/libavcodec/loco.c
new file mode 100644
index 0000000..ffb9742
--- /dev/null
+++ b/ffmpeg1/libavcodec/loco.c
@@ -0,0 +1,312 @@
+/*
+ * LOCO codec
+ * Copyright (c) 2005 Konstantin Shishkov
+ *
+ * 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
+ * LOCO codec.
+ */
+
+#include "avcodec.h"
+#include "get_bits.h"
+#include "golomb.h"
+#include "internal.h"
+#include "mathops.h"
+
+enum LOCO_MODE {
+    LOCO_UNKN  =  0,
+    LOCO_CYUY2 = -1,
+    LOCO_CRGB  = -2,
+    LOCO_CRGBA = -3,
+    LOCO_CYV12 = -4,
+    LOCO_YUY2  =  1,
+    LOCO_UYVY  =  2,
+    LOCO_RGB   =  3,
+    LOCO_RGBA  =  4,
+    LOCO_YV12  =  5,
+};
+
+typedef struct LOCOContext {
+    AVCodecContext *avctx;
+    int lossy;
+    int mode;
+} LOCOContext;
+
+typedef struct RICEContext {
+    GetBitContext gb;
+    int save, run, run2; /* internal rice decoder state */
+    int sum, count; /* sum and count for getting rice parameter */
+    int lossy;
+} RICEContext;
+
+static int loco_get_rice_param(RICEContext *r)
+{
+    int cnt = 0;
+    int val = r->count;
+
+    while (r->sum > val && cnt < 9) {
+        val <<= 1;
+        cnt++;
+    }
+
+    return cnt;
+}
+
+static inline void loco_update_rice_param(RICEContext *r, int val)
+{
+    r->sum += val;
+    r->count++;
+
+    if (r->count == 16) {
+        r->sum   >>= 1;
+        r->count >>= 1;
+    }
+}
+
+static inline int loco_get_rice(RICEContext *r)
+{
+    int v;
+    if (r->run > 0) { /* we have zero run */
+        r->run--;
+        loco_update_rice_param(r, 0);
+        return 0;
+    }
+    v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
+    loco_update_rice_param(r, (v + 1) >> 1);
+    if (!v) {
+        if (r->save >= 0) {
+            r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
+            if (r->run > 1)
+                r->save += r->run + 1;
+            else
+                r->save -= 3;
+        } else
+            r->run2++;
+    } else {
+        v = ((v >> 1) + r->lossy) ^ -(v & 1);
+        if (r->run2 > 0) {
+            if (r->run2 > 2)
+                r->save += r->run2;
+            else
+                r->save -= 3;
+            r->run2 = 0;
+        }
+    }
+
+    return v;
+}
+
+/* LOCO main predictor - LOCO-I/JPEG-LS predictor */
+static inline int loco_predict(uint8_t* data, int stride, int step)
+{
+    int a, b, c;
+
+    a = data[-stride];
+    b = data[-step];
+    c = data[-stride - step];
+
+    return mid_pred(a, a + b - c, b);
+}
+
+static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
+                             int stride, const uint8_t *buf, int buf_size, int step)
+{
+    RICEContext rc;
+    int val;
+    int i, j;
+
+    if(buf_size<=0)
+        return -1;
+
+    init_get_bits(&rc.gb, buf, buf_size*8);
+    rc.save  = 0;
+    rc.run   = 0;
+    rc.run2  = 0;
+    rc.lossy = l->lossy;
+
+    rc.sum   = 8;
+    rc.count = 1;
+
+    /* restore top left pixel */
+    val     = loco_get_rice(&rc);
+    data[0] = 128 + val;
+    /* restore top line */
+    for (i = 1; i < width; i++) {
+        val = loco_get_rice(&rc);
+        data[i * step] = data[i * step - step] + val;
+    }
+    data += stride;
+    for (j = 1; j < height; j++) {
+        /* restore left column */
+        val = loco_get_rice(&rc);
+        data[0] = data[-stride] + val;
+        /* restore all other pixels */
+        for (i = 1; i < width; i++) {
+            val = loco_get_rice(&rc);
+            data[i * step] = loco_predict(&data[i * step], stride, step) + val;
+        }
+        data += stride;
+    }
+
+    return (get_bits_count(&rc.gb) + 7) >> 3;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    LOCOContext * const l = avctx->priv_data;
+    const uint8_t *buf    = avpkt->data;
+    int buf_size          = avpkt->size;
+    AVFrame * const p     = data;
+    int decoded, ret;
+
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+    p->key_frame = 1;
+
+#define ADVANCE_BY_DECODED do { \
+    if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
+    buf += decoded; buf_size -= decoded; \
+} while(0)
+    switch(l->mode) {
+    case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
+        decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
+                                    p->linesize[0], buf, buf_size, 1);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
+                                    p->linesize[1], buf, buf_size, 1);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
+                                    p->linesize[2], buf, buf_size, 1);
+        break;
+    case LOCO_CYV12: case LOCO_YV12:
+        decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
+                                    p->linesize[0], buf, buf_size, 1);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
+                                    p->linesize[2], buf, buf_size, 1);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
+                                    p->linesize[1], buf, buf_size, 1);
+        break;
+    case LOCO_CRGB: case LOCO_RGB:
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 3);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 3);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 3);
+        break;
+    case LOCO_CRGBA:
+    case LOCO_RGBA:
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 4);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 4);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 4);
+        ADVANCE_BY_DECODED;
+        decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 3, avctx->width, avctx->height,
+                                    -p->linesize[0], buf, buf_size, 4);
+        break;
+    default:
+        av_assert0(0);
+    }
+
+    if (decoded < 0 || decoded > buf_size)
+        goto buf_too_small;
+    buf_size -= decoded;
+
+    *got_frame      = 1;
+
+    return avpkt->size - buf_size;
+buf_too_small:
+    av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
+    return AVERROR(EINVAL);
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    LOCOContext * const l = avctx->priv_data;
+    int version;
+
+    l->avctx = avctx;
+    if (avctx->extradata_size < 12) {
+        av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
+               avctx->extradata_size);
+        return AVERROR_INVALIDDATA;
+    }
+    version = AV_RL32(avctx->extradata);
+    switch (version) {
+    case 1:
+        l->lossy = 0;
+        break;
+    case 2:
+        l->lossy = AV_RL32(avctx->extradata + 8);
+        break;
+    default:
+        l->lossy = AV_RL32(avctx->extradata + 8);
+        avpriv_request_sample(avctx, "LOCO codec version %i", version);
+    }
+
+    l->mode = AV_RL32(avctx->extradata + 4);
+    switch (l->mode) {
+    case LOCO_CYUY2:
+    case LOCO_YUY2:
+    case LOCO_UYVY:
+        avctx->pix_fmt = AV_PIX_FMT_YUV422P;
+        break;
+    case LOCO_CRGB:
+    case LOCO_RGB:
+        avctx->pix_fmt = AV_PIX_FMT_BGR24;
+        break;
+    case LOCO_CYV12:
+    case LOCO_YV12:
+        avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+        break;
+    case LOCO_CRGBA:
+    case LOCO_RGBA:
+        avctx->pix_fmt = AV_PIX_FMT_BGRA;
+        break;
+    default:
+        av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
+        return AVERROR_INVALIDDATA;
+    }
+    if (avctx->debug & FF_DEBUG_PICT_INFO)
+        av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
+
+    return 0;
+}
+
+AVCodec ff_loco_decoder = {
+    .name           = "loco",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_LOCO,
+    .priv_data_size = sizeof(LOCOContext),
+    .init           = decode_init,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("LOCO"),
+};