adding ffmpeg specific version

1 files changed, 256 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/c93.c b/ffmpeg1/libavcodec/c93.c
new file mode 100644
index 0000000..9aaa3ee
--- /dev/null
+++ b/ffmpeg1/libavcodec/c93.c
@@ -0,0 +1,256 @@
+/*
+ * Interplay C93 video decoder
+ * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
+ *
+ * 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
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+typedef struct {
+    AVFrame pictures[2];
+    int currentpic;
+} C93DecoderContext;
+
+typedef enum {
+    C93_8X8_FROM_PREV  = 0x02,
+    C93_4X4_FROM_PREV  = 0x06,
+    C93_4X4_FROM_CURR  = 0x07,
+    C93_8X8_2COLOR     = 0x08,
+    C93_4X4_2COLOR     = 0x0A,
+    C93_4X4_4COLOR_GRP = 0x0B,
+    C93_4X4_4COLOR     = 0x0D,
+    C93_NOOP           = 0x0E,
+    C93_8X8_INTRA      = 0x0F,
+} C93BlockType;
+
+#define WIDTH   320
+#define HEIGHT  192
+
+#define C93_HAS_PALETTE 0x01
+#define C93_FIRST_FRAME 0x02
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    C93DecoderContext *s = avctx->priv_data;
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+    avcodec_get_frame_defaults(&s->pictures[0]);
+    avcodec_get_frame_defaults(&s->pictures[1]);
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    C93DecoderContext * const c93 = avctx->priv_data;
+
+    av_frame_unref(&c93->pictures[0]);
+    av_frame_unref(&c93->pictures[1]);
+
+    return 0;
+}
+
+static inline int copy_block(AVCodecContext *avctx, uint8_t *to,
+        uint8_t *from, int offset, int height, int stride)
+{
+    int i;
+    int width = height;
+    int from_x = offset % WIDTH;
+    int from_y = offset / WIDTH;
+    int overflow = from_x + width - WIDTH;
+
+    if (!from) {
+        /* silently ignoring predictive blocks in first frame */
+        return 0;
+    }
+
+    if (from_y + height > HEIGHT) {
+        av_log(avctx, AV_LOG_ERROR, "invalid offset %d during C93 decoding\n",
+               offset);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (overflow > 0) {
+        width -= overflow;
+        for (i = 0; i < height; i++) {
+            memcpy(&to[i*stride+width], &from[(from_y+i)*stride], overflow);
+        }
+    }
+
+    for (i = 0; i < height; i++) {
+        memcpy(&to[i*stride], &from[(from_y+i)*stride+from_x], width);
+    }
+
+    return 0;
+}
+
+static inline void draw_n_color(uint8_t *out, int stride, int width,
+         int height, int bpp, uint8_t cols[4], uint8_t grps[4], uint32_t col)
+{
+    int x, y;
+    for (y = 0; y < height; y++) {
+        if (grps)
+            cols[0] = grps[3 * (y >> 1)];
+        for (x = 0; x < width; x++) {
+            if (grps)
+                cols[1]= grps[(x >> 1) + 1];
+            out[x + y*stride] = cols[col & ((1 << bpp) - 1)];
+            col >>= bpp;
+        }
+    }
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+                        int *got_frame, AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    C93DecoderContext * const c93 = avctx->priv_data;
+    AVFrame * const newpic = &c93->pictures[c93->currentpic];
+    AVFrame * const oldpic = &c93->pictures[c93->currentpic^1];
+    GetByteContext gb;
+    uint8_t *out;
+    int stride, ret, i, x, y, b, bt = 0;
+
+    c93->currentpic ^= 1;
+
+    if ((ret = ff_reget_buffer(avctx, newpic)) < 0)
+        return ret;
+
+    stride = newpic->linesize[0];
+
+    bytestream2_init(&gb, buf, buf_size);
+    b = bytestream2_get_byte(&gb);
+    if (b & C93_FIRST_FRAME) {
+        newpic->pict_type = AV_PICTURE_TYPE_I;
+        newpic->key_frame = 1;
+    } else {
+        newpic->pict_type = AV_PICTURE_TYPE_P;
+        newpic->key_frame = 0;
+    }
+
+    for (y = 0; y < HEIGHT; y += 8) {
+        out = newpic->data[0] + y * stride;
+        for (x = 0; x < WIDTH; x += 8) {
+            uint8_t *copy_from = oldpic->data[0];
+            unsigned int offset, j;
+            uint8_t cols[4], grps[4];
+            C93BlockType block_type;
+
+            if (!bt)
+                bt = bytestream2_get_byte(&gb);
+
+            block_type= bt & 0x0F;
+            switch (block_type) {
+            case C93_8X8_FROM_PREV:
+                offset = bytestream2_get_le16(&gb);
+                if ((ret = copy_block(avctx, out, copy_from, offset, 8, stride)) < 0)
+                    return ret;
+                break;
+
+            case C93_4X4_FROM_CURR:
+                copy_from = newpic->data[0];
+            case C93_4X4_FROM_PREV:
+                for (j = 0; j < 8; j += 4) {
+                    for (i = 0; i < 8; i += 4) {
+                        offset = bytestream2_get_le16(&gb);
+                        if ((ret = copy_block(avctx, &out[j*stride+i],
+                                              copy_from, offset, 4, stride)) < 0)
+                            return ret;
+                    }
+                }
+                break;
+
+            case C93_8X8_2COLOR:
+                bytestream2_get_buffer(&gb, cols, 2);
+                for (i = 0; i < 8; i++) {
+                    draw_n_color(out + i*stride, stride, 8, 1, 1, cols,
+                                     NULL, bytestream2_get_byte(&gb));
+                }
+
+                break;
+
+            case C93_4X4_2COLOR:
+            case C93_4X4_4COLOR:
+            case C93_4X4_4COLOR_GRP:
+                for (j = 0; j < 8; j += 4) {
+                    for (i = 0; i < 8; i += 4) {
+                        if (block_type == C93_4X4_2COLOR) {
+                            bytestream2_get_buffer(&gb, cols, 2);
+                            draw_n_color(out + i + j*stride, stride, 4, 4,
+                                    1, cols, NULL, bytestream2_get_le16(&gb));
+                        } else if (block_type == C93_4X4_4COLOR) {
+                            bytestream2_get_buffer(&gb, cols, 4);
+                            draw_n_color(out + i + j*stride, stride, 4, 4,
+                                    2, cols, NULL, bytestream2_get_le32(&gb));
+                        } else {
+                            bytestream2_get_buffer(&gb, grps, 4);
+                            draw_n_color(out + i + j*stride, stride, 4, 4,
+                                    1, cols, grps, bytestream2_get_le16(&gb));
+                        }
+                    }
+                }
+                break;
+
+            case C93_NOOP:
+                break;
+
+            case C93_8X8_INTRA:
+                for (j = 0; j < 8; j++)
+                    bytestream2_get_buffer(&gb, out + j*stride, 8);
+                break;
+
+            default:
+                av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n",
+                       block_type, x, y);
+                return AVERROR_INVALIDDATA;
+            }
+            bt >>= 4;
+            out += 8;
+        }
+    }
+
+    if (b & C93_HAS_PALETTE) {
+        uint32_t *palette = (uint32_t *) newpic->data[1];
+        for (i = 0; i < 256; i++) {
+            palette[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
+        }
+        newpic->palette_has_changed = 1;
+    } else {
+        if (oldpic->data[1])
+            memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
+    }
+
+    if ((ret = av_frame_ref(data, newpic)) < 0)
+        return ret;
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+AVCodec ff_c93_decoder = {
+    .name           = "c93",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_C93,
+    .priv_data_size = sizeof(C93DecoderContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Interplay C93"),
+};