adding ffmpeg specific version

1 files changed, 307 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/targa.c b/ffmpeg1/libavcodec/targa.c
new file mode 100644
index 0000000..ff4390f
--- /dev/null
+++ b/ffmpeg1/libavcodec/targa.c
@@ -0,0 +1,307 @@
+/*
+ * Targa (.tga) image decoder
+ * Copyright (c) 2006 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
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "targa.h"
+
+typedef struct TargaContext {
+    GetByteContext gb;
+} TargaContext;
+
+static uint8_t *advance_line(uint8_t *start, uint8_t *line,
+                             int stride, int *y, int h, int interleave)
+{
+    *y += interleave;
+
+    if (*y < h) {
+        return line + interleave * stride;
+    } else {
+        *y = (*y + 1) & (interleave - 1);
+        if (*y && *y < h) {
+            return start + *y * stride;
+        } else {
+            return NULL;
+        }
+    }
+}
+
+static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
+                            uint8_t *start, int w, int h, int stride,
+                            int bpp, int interleave)
+{
+    int x, y;
+    int depth = (bpp + 1) >> 3;
+    int type, count;
+    uint8_t *line = start;
+    uint8_t *dst  = line;
+
+    x = y = count = 0;
+    while (dst) {
+        if (bytestream2_get_bytes_left(&s->gb) <= 0) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Ran ouf of data before end-of-image\n");
+            return AVERROR_INVALIDDATA;
+        }
+        type  = bytestream2_get_byteu(&s->gb);
+        count = (type & 0x7F) + 1;
+        type &= 0x80;
+        if (!type) {
+            do {
+                int n  = FFMIN(count, w - x);
+                bytestream2_get_buffer(&s->gb, dst, n * depth);
+                count -= n;
+                dst   += n * depth;
+                x     += n;
+                if (x == w) {
+                    x    = 0;
+                    dst = line = advance_line(start, line, stride, &y, h, interleave);
+                }
+            } while (dst && count > 0);
+        } else {
+            uint8_t tmp[4];
+            bytestream2_get_buffer(&s->gb, tmp, depth);
+            do {
+                int n  = FFMIN(count, w - x);
+                count -= n;
+                x     += n;
+                do {
+                    memcpy(dst, tmp, depth);
+                    dst += depth;
+                } while (--n);
+                if (x == w) {
+                    x    = 0;
+                    dst = line = advance_line(start, line, stride, &y, h, interleave);
+                }
+            } while (dst && count > 0);
+        }
+    }
+
+    if (count) {
+        av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    TargaContext * const s = avctx->priv_data;
+    AVFrame * const p = data;
+    uint8_t *dst;
+    int stride;
+    int idlen, pal, compr, y, w, h, bpp, flags, ret;
+    int first_clr, colors, csize;
+    int interleave;
+
+    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
+
+    /* parse image header */
+    idlen     = bytestream2_get_byte(&s->gb);
+    pal       = bytestream2_get_byte(&s->gb);
+    compr     = bytestream2_get_byte(&s->gb);
+    first_clr = bytestream2_get_le16(&s->gb);
+    colors    = bytestream2_get_le16(&s->gb);
+    csize     = bytestream2_get_byte(&s->gb);
+    bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
+    w         = bytestream2_get_le16(&s->gb);
+    h         = bytestream2_get_le16(&s->gb);
+    bpp       = bytestream2_get_byte(&s->gb);
+
+    if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
+        av_log(avctx, AV_LOG_ERROR,
+                "Not enough data to read header\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    flags     = bytestream2_get_byte(&s->gb);
+
+    if (!pal && (first_clr || colors || csize)) {
+        av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
+        // specification says we should ignore those value in this case
+        first_clr = colors = csize = 0;
+    }
+
+    // skip identifier if any
+    bytestream2_skip(&s->gb, idlen);
+
+    switch (bpp) {
+    case 8:
+        avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
+        break;
+    case 15:
+    case 16:
+        avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
+        break;
+    case 24:
+        avctx->pix_fmt = AV_PIX_FMT_BGR24;
+        break;
+    case 32:
+        avctx->pix_fmt = AV_PIX_FMT_BGRA;
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (colors && (colors + first_clr) > 256) {
+        av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
+        return AVERROR_INVALIDDATA;
+    }
+
+    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;
+
+    if (flags & TGA_TOPTOBOTTOM) {
+        dst = p->data[0];
+        stride = p->linesize[0];
+    } else { //image is upside-down
+        dst = p->data[0] + p->linesize[0] * (h - 1);
+        stride = -p->linesize[0];
+    }
+
+    interleave = flags & TGA_INTERLEAVE2 ? 2 :
+                 flags & TGA_INTERLEAVE4 ? 4 : 1;
+
+    if (colors) {
+        int pal_size, pal_sample_size;
+
+        switch (csize) {
+        case 32: pal_sample_size = 4; break;
+        case 24: pal_sample_size = 3; break;
+        case 16:
+        case 15: pal_sample_size = 2; break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
+            return AVERROR_INVALIDDATA;
+        }
+        pal_size = colors * pal_sample_size;
+        if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
+            bytestream2_skip(&s->gb, pal_size);
+        else {
+            int t;
+            uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
+
+            if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Not enough data to read palette\n");
+                return AVERROR_INVALIDDATA;
+            }
+            switch (pal_sample_size) {
+            case 4:
+                for (t = 0; t < colors; t++)
+                    *pal++ = bytestream2_get_le32u(&s->gb);
+                break;
+            case 3:
+                /* RGB24 */
+                for (t = 0; t < colors; t++)
+                    *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
+                break;
+            case 2:
+                /* RGB555 */
+                for (t = 0; t < colors; t++) {
+                    uint32_t v = bytestream2_get_le16u(&s->gb);
+                    v = ((v & 0x7C00) <<  9) |
+                        ((v & 0x03E0) <<  6) |
+                        ((v & 0x001F) <<  3);
+                    /* left bit replication */
+                    v |= (v & 0xE0E0E0U) >> 5;
+                    *pal++ = (0xffU<<24) | v;
+                }
+                break;
+            }
+            p->palette_has_changed = 1;
+        }
+    }
+
+    if ((compr & (~TGA_RLE)) == TGA_NODATA) {
+        memset(p->data[0], 0, p->linesize[0] * h);
+    } else {
+        if (compr & TGA_RLE) {
+            int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
+            if (res < 0)
+                return res;
+        } else {
+            size_t img_size = w * ((bpp + 1) >> 3);
+            uint8_t *line;
+            if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Not enough data available for image\n");
+                return AVERROR_INVALIDDATA;
+            }
+
+            line = dst;
+            y = 0;
+            do {
+                bytestream2_get_buffer(&s->gb, line, img_size);
+                line = advance_line(dst, line, stride, &y, h, interleave);
+            } while (line);
+        }
+    }
+
+    if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
+        int x;
+        for (y = 0; y < h; y++) {
+            void *line = &p->data[0][y * p->linesize[0]];
+            for (x = 0; x < w >> 1; x++) {
+                switch (bpp) {
+                case 32:
+                    FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
+                    break;
+                case 24:
+                    FFSWAP(uint8_t, ((uint8_t *)line)[3 * x    ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
+                    FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
+                    FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
+                    break;
+                case 16:
+                    FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
+                    break;
+                case 8:
+                    FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
+                }
+            }
+        }
+    }
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+AVCodec ff_targa_decoder = {
+    .name           = "targa",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_TARGA,
+    .priv_data_size = sizeof(TargaContext),
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
+};