From 150c9823e71a161e97003849cf8b2f55b21520bd Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Mon, 26 Aug 2013 15:10:18 +0100
Subject: adding ffmpeg specific version

---
 ffmpeg1/libavcodec/pcx.c | 234 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 234 insertions(+)
 create mode 100644 ffmpeg1/libavcodec/pcx.c

(limited to 'ffmpeg1/libavcodec/pcx.c')

diff --git a/ffmpeg1/libavcodec/pcx.c b/ffmpeg1/libavcodec/pcx.c
new file mode 100644
index 0000000..ba92332
--- /dev/null
+++ b/ffmpeg1/libavcodec/pcx.c
@@ -0,0 +1,234 @@
+/*
+ * PC Paintbrush PCX (.pcx) image decoder
+ * Copyright (c) 2007, 2008 Ivo van Poorten
+ *
+ * This decoder does not support CGA palettes. I am unable to find samples
+ * and Netpbm cannot generate them.
+ *
+ * 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 "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
+#include "internal.h"
+
+static void pcx_rle_decode(GetByteContext *gb, uint8_t *dst,
+                           unsigned int bytes_per_scanline, int compressed)
+{
+    unsigned int i = 0;
+    unsigned char run, value;
+
+    if (compressed) {
+        while (i<bytes_per_scanline) {
+            run = 1;
+            value = bytestream2_get_byte(gb);
+            if (value >= 0xc0) {
+                run = value & 0x3f;
+                value = bytestream2_get_byte(gb);
+            }
+            while (i<bytes_per_scanline && run--)
+                dst[i++] = value;
+        }
+    } else {
+        bytestream2_get_buffer(gb, dst, bytes_per_scanline);
+    }
+}
+
+static void pcx_palette(GetByteContext *gb, uint32_t *dst, int pallen)
+{
+    int i;
+
+    pallen = FFMIN(pallen, bytestream2_get_bytes_left(gb) / 3);
+    for (i=0; i<pallen; i++)
+        *dst++ = 0xFF000000 | bytestream2_get_be24u(gb);
+    if (pallen < 256)
+        memset(dst, 0, (256 - pallen) * sizeof(*dst));
+}
+
+static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+                            AVPacket *avpkt) {
+    GetByteContext gb;
+    AVFrame * const p = data;
+    int compressed, xmin, ymin, xmax, ymax, ret;
+    unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
+                 bytes_per_scanline;
+    uint8_t *ptr, *scanline;
+
+    if (avpkt->size < 128)
+        return AVERROR_INVALIDDATA;
+
+    bytestream2_init(&gb, avpkt->data, avpkt->size);
+
+    if (bytestream2_get_byteu(&gb) != 0x0a || bytestream2_get_byteu(&gb) > 5) {
+        av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    compressed = bytestream2_get_byteu(&gb);
+    bits_per_pixel = bytestream2_get_byteu(&gb);
+    xmin = bytestream2_get_le16u(&gb);
+    ymin = bytestream2_get_le16u(&gb);
+    xmax = bytestream2_get_le16u(&gb);
+    ymax = bytestream2_get_le16u(&gb);
+    avctx->sample_aspect_ratio.num = bytestream2_get_le16u(&gb);
+    avctx->sample_aspect_ratio.den = bytestream2_get_le16u(&gb);
+
+    if (xmax < xmin || ymax < ymin) {
+        av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    w = xmax - xmin + 1;
+    h = ymax - ymin + 1;
+
+    bytestream2_skipu(&gb, 49);
+    nplanes            = bytestream2_get_byteu(&gb);
+    bytes_per_line     = bytestream2_get_le16u(&gb);
+    bytes_per_scanline = nplanes * bytes_per_line;
+
+    if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8) {
+        av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    switch ((nplanes<<8) + bits_per_pixel) {
+        case 0x0308:
+            avctx->pix_fmt = AV_PIX_FMT_RGB24;
+            break;
+        case 0x0108:
+        case 0x0104:
+        case 0x0102:
+        case 0x0101:
+        case 0x0401:
+        case 0x0301:
+        case 0x0201:
+            avctx->pix_fmt = AV_PIX_FMT_PAL8;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
+            return AVERROR_INVALIDDATA;
+    }
+
+    bytestream2_skipu(&gb, 60);
+
+    if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
+        return ret;
+    if (w != avctx->width || h != avctx->height)
+        avcodec_set_dimensions(avctx, w, h);
+    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
+        return ret;
+
+    p->pict_type = AV_PICTURE_TYPE_I;
+
+    ptr    = p->data[0];
+    stride = p->linesize[0];
+
+    scanline = av_malloc(bytes_per_scanline + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!scanline)
+        return AVERROR(ENOMEM);
+
+    if (nplanes == 3 && bits_per_pixel == 8) {
+        for (y=0; y<h; y++) {
+            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
+
+            for (x=0; x<w; x++) {
+                ptr[3*x  ] = scanline[x                    ];
+                ptr[3*x+1] = scanline[x+ bytes_per_line    ];
+                ptr[3*x+2] = scanline[x+(bytes_per_line<<1)];
+            }
+
+            ptr += stride;
+        }
+
+    } else if (nplanes == 1 && bits_per_pixel == 8) {
+        int palstart = avpkt->size - 769;
+
+        for (y=0; y<h; y++, ptr+=stride) {
+            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
+            memcpy(ptr, scanline, w);
+        }
+
+        if (bytestream2_tell(&gb) != palstart) {
+            av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
+            bytestream2_seek(&gb, palstart, SEEK_SET);
+        }
+        if (bytestream2_get_byte(&gb) != 12) {
+            av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
+            ret = AVERROR_INVALIDDATA;
+            goto end;
+        }
+
+    } else if (nplanes == 1) {   /* all packed formats, max. 16 colors */
+        GetBitContext s;
+
+        for (y=0; y<h; y++) {
+            init_get_bits8(&s, scanline, bytes_per_scanline);
+
+            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
+
+            for (x=0; x<w; x++)
+                ptr[x] = get_bits(&s, bits_per_pixel);
+            ptr += stride;
+        }
+
+    } else {    /* planar, 4, 8 or 16 colors */
+        int i;
+
+        for (y=0; y<h; y++) {
+            pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
+
+            for (x=0; x<w; x++) {
+                int m = 0x80 >> (x&7), v = 0;
+                for (i=nplanes - 1; i>=0; i--) {
+                    v <<= 1;
+                    v  += !!(scanline[i*bytes_per_line + (x>>3)] & m);
+                }
+                ptr[x] = v;
+            }
+            ptr += stride;
+        }
+    }
+
+    ret = bytestream2_tell(&gb);
+    if (nplanes == 1 && bits_per_pixel == 8) {
+        pcx_palette(&gb, (uint32_t *) p->data[1], 256);
+        ret += 256 * 3;
+    } else if (bits_per_pixel * nplanes == 1) {
+        AV_WN32A(p->data[1]  , 0xFF000000);
+        AV_WN32A(p->data[1]+4, 0xFFFFFFFF);
+    } else if (bits_per_pixel < 8) {
+        bytestream2_seek(&gb, 16, SEEK_SET);
+        pcx_palette(&gb, (uint32_t *) p->data[1], 16);
+    }
+
+    *got_frame = 1;
+
+end:
+    av_free(scanline);
+    return ret;
+}
+
+AVCodec ff_pcx_decoder = {
+    .name           = "pcx",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_PCX,
+    .decode         = pcx_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
+};
-- 
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