summaryrefslogtreecommitdiff
path: root/ffmpeg1/libavcodec/yop.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg1/libavcodec/yop.c')
-rw-r--r--ffmpeg1/libavcodec/yop.c257
1 files changed, 0 insertions, 257 deletions
diff --git a/ffmpeg1/libavcodec/yop.c b/ffmpeg1/libavcodec/yop.c
deleted file mode 100644
index e1f5321..0000000
--- a/ffmpeg1/libavcodec/yop.c
+++ /dev/null
@@ -1,257 +0,0 @@
-/*
- * Psygnosis YOP decoder
- *
- * Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com>
- * derived from the code by
- * Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@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 "libavutil/intreadwrite.h"
-#include "libavutil/imgutils.h"
-
-#include "avcodec.h"
-#include "get_bits.h"
-#include "internal.h"
-
-typedef struct YopDecContext {
- AVCodecContext *avctx;
-
- int num_pal_colors;
- int first_color[2];
- int frame_data_length;
-
- uint8_t *low_nibble;
- uint8_t *srcptr;
- uint8_t *src_end;
- uint8_t *dstptr;
- uint8_t *dstbuf;
-} YopDecContext;
-
-// These tables are taken directly from:
-// http://wiki.multimedia.cx/index.php?title=Psygnosis_YOP
-
-/**
- * Lookup table for painting macroblocks. Bytes 0-2 of each entry contain
- * the macroblock positions to be painted (taken as (0, B0, B1, B2)).
- * Byte 3 contains the number of bytes consumed on the input,
- * equal to max(bytes 0-2) + 1.
- */
-static const uint8_t paint_lut[15][4] =
- {{1, 2, 3, 4}, {1, 2, 0, 3},
- {1, 2, 1, 3}, {1, 2, 2, 3},
- {1, 0, 2, 3}, {1, 0, 0, 2},
- {1, 0, 1, 2}, {1, 1, 2, 3},
- {0, 1, 2, 3}, {0, 1, 0, 2},
- {1, 1, 0, 2}, {0, 1, 1, 2},
- {0, 0, 1, 2}, {0, 0, 0, 1},
- {1, 1, 1, 2},
- };
-
-/**
- * Lookup table for copying macroblocks. Each entry contains the respective
- * x and y pixel offset for the copy source.
- */
-static const int8_t motion_vector[16][2] =
- {{-4, -4}, {-2, -4},
- { 0, -4}, { 2, -4},
- {-4, -2}, {-4, 0},
- {-3, -3}, {-1, -3},
- { 1, -3}, { 3, -3},
- {-3, -1}, {-2, -2},
- { 0, -2}, { 2, -2},
- { 4, -2}, {-2, 0},
- };
-
-static av_cold int yop_decode_init(AVCodecContext *avctx)
-{
- YopDecContext *s = avctx->priv_data;
- s->avctx = avctx;
-
- if (avctx->width & 1 || avctx->height & 1 ||
- av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) {
- av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n");
- return AVERROR_INVALIDDATA;
- }
-
- if (avctx->extradata_size < 3) {
- av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata.\n");
- return AVERROR_INVALIDDATA;
- }
-
- avctx->pix_fmt = AV_PIX_FMT_PAL8;
-
- s->num_pal_colors = avctx->extradata[0];
- s->first_color[0] = avctx->extradata[1];
- s->first_color[1] = avctx->extradata[2];
-
- if (s->num_pal_colors + s->first_color[0] > 256 ||
- s->num_pal_colors + s->first_color[1] > 256) {
- av_log(avctx, AV_LOG_ERROR,
- "Palette parameters invalid, header probably corrupt\n");
- return AVERROR_INVALIDDATA;
- }
-
- return 0;
-}
-
-/**
- * Paint a macroblock using the pattern in paint_lut.
- * @param s codec context
- * @param tag the tag that was in the nibble
- */
-static int yop_paint_block(YopDecContext *s, int linesize, int tag)
-{
- if (s->src_end - s->srcptr < paint_lut[tag][3]) {
- av_log(s->avctx, AV_LOG_ERROR, "Packet too small.\n");
- return AVERROR_INVALIDDATA;
- }
-
- s->dstptr[0] = s->srcptr[0];
- s->dstptr[1] = s->srcptr[paint_lut[tag][0]];
- s->dstptr[linesize] = s->srcptr[paint_lut[tag][1]];
- s->dstptr[linesize + 1] = s->srcptr[paint_lut[tag][2]];
-
- // The number of src bytes consumed is in the last part of the lut entry.
- s->srcptr += paint_lut[tag][3];
- return 0;
-}
-
-/**
- * Copy a previously painted macroblock to the current_block.
- * @param copy_tag the tag that was in the nibble
- */
-static int yop_copy_previous_block(YopDecContext *s, int linesize, int copy_tag)
-{
- uint8_t *bufptr;
-
- // Calculate position for the copy source
- bufptr = s->dstptr + motion_vector[copy_tag][0] +
- linesize * motion_vector[copy_tag][1];
- if (bufptr < s->dstbuf) {
- av_log(s->avctx, AV_LOG_ERROR, "File probably corrupt\n");
- return AVERROR_INVALIDDATA;
- }
-
- s->dstptr[0] = bufptr[0];
- s->dstptr[1] = bufptr[1];
- s->dstptr[linesize] = bufptr[linesize];
- s->dstptr[linesize + 1] = bufptr[linesize + 1];
-
- return 0;
-}
-
-/**
- * Return the next nibble in sequence, consuming a new byte on the input
- * only if necessary.
- */
-static uint8_t yop_get_next_nibble(YopDecContext *s)
-{
- int ret;
-
- if (s->low_nibble) {
- ret = *s->low_nibble & 0xf;
- s->low_nibble = NULL;
- }else {
- s->low_nibble = s->srcptr++;
- ret = *s->low_nibble >> 4;
- }
- return ret;
-}
-
-static int yop_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
- AVPacket *avpkt)
-{
- YopDecContext *s = avctx->priv_data;
- AVFrame *frame = data;
- int tag, firstcolor, is_odd_frame;
- int ret, i, x, y;
- uint32_t *palette;
-
- if (avpkt->size < 4 + 3 * s->num_pal_colors) {
- av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
- return AVERROR_INVALIDDATA;
- }
-
- if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
- return ret;
-
- if (!avctx->frame_number)
- memset(frame->data[1], 0, AVPALETTE_SIZE);
-
- s->dstbuf = frame->data[0];
- s->dstptr = frame->data[0];
- s->srcptr = avpkt->data + 4;
- s->src_end = avpkt->data + avpkt->size;
- s->low_nibble = NULL;
-
- is_odd_frame = avpkt->data[0];
- if(is_odd_frame>1){
- av_log(avctx, AV_LOG_ERROR, "frame is too odd %d\n", is_odd_frame);
- return AVERROR_INVALIDDATA;
- }
- firstcolor = s->first_color[is_odd_frame];
- palette = (uint32_t *)frame->data[1];
-
- for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3) {
- palette[i + firstcolor] = (s->srcptr[0] << 18) |
- (s->srcptr[1] << 10) |
- (s->srcptr[2] << 2);
- palette[i + firstcolor] |= 0xFFU << 24 |
- (palette[i + firstcolor] >> 6) & 0x30303;
- }
-
- frame->palette_has_changed = 1;
-
- for (y = 0; y < avctx->height; y += 2) {
- for (x = 0; x < avctx->width; x += 2) {
- if (s->srcptr - avpkt->data >= avpkt->size) {
- av_log(avctx, AV_LOG_ERROR, "Packet too small.\n");
- return AVERROR_INVALIDDATA;
- }
-
- tag = yop_get_next_nibble(s);
-
- if (tag != 0xf) {
- ret = yop_paint_block(s, frame->linesize[0], tag);
- if (ret < 0)
- return ret;
- } else {
- tag = yop_get_next_nibble(s);
- ret = yop_copy_previous_block(s, frame->linesize[0], tag);
- if (ret < 0)
- return ret;
- }
- s->dstptr += 2;
- }
- s->dstptr += 2*frame->linesize[0] - x;
- }
-
- *got_frame = 1;
- return avpkt->size;
-}
-
-AVCodec ff_yop_decoder = {
- .name = "yop",
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_YOP,
- .priv_data_size = sizeof(YopDecContext),
- .init = yop_decode_init,
- .decode = yop_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 16:15:52 +0000