adding ffmpeg specific version

1 files changed, 262 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/pictordec.c b/ffmpeg1/libavcodec/pictordec.c
new file mode 100644
index 0000000..bf138b2
--- /dev/null
+++ b/ffmpeg1/libavcodec/pictordec.c
@@ -0,0 +1,262 @@
+/*
+ * Pictor/PC Paint decoder
+ * Copyright (c) 2010 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Pictor/PC Paint decoder
+ */
+
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "cga_data.h"
+#include "internal.h"
+
+typedef struct PicContext {
+    int width, height;
+    int nb_planes;
+    GetByteContext g;
+} PicContext;
+
+static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
+                           int *x, int *y)
+{
+    while (run > 0) {
+        uint8_t *d = frame->data[0] + *y * frame->linesize[0];
+        if (*x + run >= s->width) {
+            int n = s->width - *x;
+            memset(d + *x, value, n);
+            run -= n;
+            *x = 0;
+            *y -= 1;
+            if (*y < 0)
+                break;
+        } else {
+            memset(d + *x, value, run);
+            *x += run;
+            break;
+        }
+    }
+}
+
+static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
+                      int *x, int *y, int *plane, int bits_per_plane)
+{
+    uint8_t *d;
+    int shift = *plane * bits_per_plane;
+    int mask  = ((1 << bits_per_plane) - 1) << shift;
+    value   <<= shift;
+
+    while (run > 0) {
+        int j;
+        for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
+            d = frame->data[0] + *y * frame->linesize[0];
+            d[*x] |= (value >> j) & mask;
+            *x += 1;
+            if (*x == s->width) {
+                *y -= 1;
+                *x = 0;
+                if (*y < 0) {
+                   *y = s->height - 1;
+                   *plane += 1;
+                   value <<= bits_per_plane;
+                   mask  <<= bits_per_plane;
+                   if (*plane >= s->nb_planes)
+                       break;
+                }
+            }
+        }
+        run--;
+    }
+}
+
+static const uint8_t cga_mode45_index[6][4] = {
+    [0] = { 0, 3,  5,   7 }, // mode4, palette#1, low intensity
+    [1] = { 0, 2,  4,   6 }, // mode4, palette#2, low intensity
+    [2] = { 0, 3,  4,   7 }, // mode5, low intensity
+    [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
+    [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
+    [5] = { 0, 11, 12, 15 }, // mode5, high intensity
+};
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    PicContext *s = avctx->priv_data;
+    AVFrame *frame = data;
+    uint32_t *palette;
+    int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
+    int i, x, y, plane, tmp, ret, val;
+
+    bytestream2_init(&s->g, avpkt->data, avpkt->size);
+
+    if (bytestream2_get_bytes_left(&s->g) < 11)
+        return AVERROR_INVALIDDATA;
+
+    if (bytestream2_get_le16u(&s->g) != 0x1234)
+        return AVERROR_INVALIDDATA;
+
+    s->width       = bytestream2_get_le16u(&s->g);
+    s->height      = bytestream2_get_le16u(&s->g);
+    bytestream2_skip(&s->g, 4);
+    tmp            = bytestream2_get_byteu(&s->g);
+    bits_per_plane = tmp & 0xF;
+    s->nb_planes   = (tmp >> 4) + 1;
+    bpp            = bits_per_plane * s->nb_planes;
+    if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
+        avpriv_request_sample(avctx, "Unsupported bit depth");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
+        bytestream2_skip(&s->g, 2);
+        etype = bytestream2_get_le16(&s->g);
+        esize = bytestream2_get_le16(&s->g);
+        if (bytestream2_get_bytes_left(&s->g) < esize)
+            return AVERROR_INVALIDDATA;
+    } else {
+        etype = -1;
+        esize = 0;
+    }
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    if (s->width != avctx->width && s->height != avctx->height) {
+        if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
+            return -1;
+        avcodec_set_dimensions(avctx, s->width, s->height);
+    }
+
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    memset(frame->data[0], 0, s->height * frame->linesize[0]);
+    frame->pict_type           = AV_PICTURE_TYPE_I;
+    frame->palette_has_changed = 1;
+
+    pos_after_pal = bytestream2_tell(&s->g) + esize;
+    palette = (uint32_t*)frame->data[1];
+    if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
+        int idx = bytestream2_get_byte(&s->g);
+        npal = 4;
+        for (i = 0; i < npal; i++)
+            palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
+    } else if (etype == 2) {
+        npal = FFMIN(esize, 16);
+        for (i = 0; i < npal; i++) {
+            int pal_idx = bytestream2_get_byte(&s->g);
+            palette[i]  = ff_cga_palette[FFMIN(pal_idx, 15)];
+        }
+    } else if (etype == 3) {
+        npal = FFMIN(esize, 16);
+        for (i = 0; i < npal; i++) {
+            int pal_idx = bytestream2_get_byte(&s->g);
+            palette[i]  = ff_ega_palette[FFMIN(pal_idx, 63)];
+        }
+    } else if (etype == 4 || etype == 5) {
+        npal = FFMIN(esize / 3, 256);
+        for (i = 0; i < npal; i++) {
+            palette[i] = bytestream2_get_be24(&s->g) << 2;
+            palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
+        }
+    } else {
+        if (bpp == 1) {
+            npal = 2;
+            palette[0] = 0xFF000000;
+            palette[1] = 0xFFFFFFFF;
+        } else if (bpp == 2) {
+            npal = 4;
+            for (i = 0; i < npal; i++)
+                palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
+        } else {
+            npal = 16;
+            memcpy(palette, ff_cga_palette, npal * 4);
+        }
+    }
+    // fill remaining palette entries
+    memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
+    // skip remaining palette bytes
+    bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
+
+    val = 0;
+    y = s->height - 1;
+    if (bytestream2_get_le16(&s->g)) {
+        x = 0;
+        plane = 0;
+        while (y >= 0 && bytestream2_get_bytes_left(&s->g) >= 6) {
+            int stop_size, marker, t1, t2;
+
+            t1        = bytestream2_get_bytes_left(&s->g);
+            t2        = bytestream2_get_le16(&s->g);
+            stop_size = t1 - FFMIN(t1, t2);
+            // ignore uncompressed block size
+            bytestream2_skip(&s->g, 2);
+            marker    = bytestream2_get_byte(&s->g);
+
+            while (plane < s->nb_planes && y >= 0 &&
+                   bytestream2_get_bytes_left(&s->g) > stop_size) {
+                int run = 1;
+                val = bytestream2_get_byte(&s->g);
+                if (val == marker) {
+                    run = bytestream2_get_byte(&s->g);
+                    if (run == 0)
+                        run = bytestream2_get_le16(&s->g);
+                    val = bytestream2_get_byte(&s->g);
+                }
+                if (!bytestream2_get_bytes_left(&s->g))
+                    break;
+
+                if (bits_per_plane == 8) {
+                    picmemset_8bpp(s, frame, val, run, &x, &y);
+                } else {
+                    picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
+                }
+            }
+        }
+
+        if (x < avctx->width && y >= 0) {
+            int run = (y + 1) * avctx->width - x;
+            if (bits_per_plane == 8)
+                picmemset_8bpp(s, frame, val, run, &x, &y);
+            else
+                picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
+        }
+    } else {
+        while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
+            memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
+            bytestream2_skip(&s->g, avctx->width);
+            y--;
+        }
+    }
+
+    *got_frame      = 1;
+    return avpkt->size;
+}
+
+AVCodec ff_pictor_decoder = {
+    .name           = "pictor",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_PICTOR,
+    .priv_data_size = sizeof(PicContext),
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
+};