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Diffstat (limited to 'ffmpeg1/libavcodec/pictordec.c')
-rw-r--r--ffmpeg1/libavcodec/pictordec.c262
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
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+/*
+ * 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"),
+};
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