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Diffstat (limited to 'contrib/ffmpeg/libavcodec/c93.c')
-rw-r--r--contrib/ffmpeg/libavcodec/c93.c253
1 files changed, 0 insertions, 253 deletions
diff --git a/contrib/ffmpeg/libavcodec/c93.c b/contrib/ffmpeg/libavcodec/c93.c
deleted file mode 100644
index 2b5d3900c..000000000
--- a/contrib/ffmpeg/libavcodec/c93.c
+++ /dev/null
@@ -1,253 +0,0 @@
-/*
- * Interplay C93 video decoder
- * Copyright (c) 2007 Anssi Hannula <anssi.hannula@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 "avcodec.h"
-#include "bytestream.h"
-
-typedef struct {
- AVFrame pictures[2];
- int currentpic;
-} C93DecoderContext;
-
-typedef enum {
- C93_8X8_FROM_PREV = 0x02,
- C93_4X4_FROM_PREV = 0x06,
- C93_4X4_FROM_CURR = 0x07,
- C93_8X8_2COLOR = 0x08,
- C93_4X4_2COLOR = 0x0A,
- C93_4X4_4COLOR_GRP = 0x0B,
- C93_4X4_4COLOR = 0x0D,
- C93_NOOP = 0x0E,
- C93_8X8_INTRA = 0x0F,
-} C93BlockType;
-
-#define WIDTH 320
-#define HEIGHT 192
-
-#define C93_HAS_PALETTE 0x01
-#define C93_FIRST_FRAME 0x02
-
-static int decode_init(AVCodecContext *avctx)
-{
- avctx->pix_fmt = PIX_FMT_PAL8;
- return 0;
-}
-
-static int decode_end(AVCodecContext *avctx)
-{
- C93DecoderContext * const c93 = avctx->priv_data;
-
- if (c93->pictures[0].data[0])
- avctx->release_buffer(avctx, &c93->pictures[0]);
- if (c93->pictures[1].data[0])
- avctx->release_buffer(avctx, &c93->pictures[1]);
- return 0;
-}
-
-static inline int copy_block(AVCodecContext *avctx, uint8_t *to,
- uint8_t *from, int offset, int height, int stride)
-{
- int i;
- int width = height;
- int from_x = offset % WIDTH;
- int from_y = offset / WIDTH;
- int overflow = from_x + width - WIDTH;
-
- if (!from) {
- /* silently ignoring predictive blocks in first frame */
- return 0;
- }
-
- if (from_y + height > HEIGHT) {
- av_log(avctx, AV_LOG_ERROR, "invalid offset %d during C93 decoding\n",
- offset);
- return -1;
- }
-
- if (overflow > 0) {
- width -= overflow;
- for (i = 0; i < height; i++) {
- memcpy(&to[i*stride+width], &from[(from_y+i)*stride], overflow);
- }
- }
-
- for (i = 0; i < height; i++) {
- memcpy(&to[i*stride], &from[(from_y+i)*stride+from_x], width);
- }
-
- return 0;
-}
-
-static inline void draw_n_color(uint8_t *out, int stride, int width,
- int height, int bpp, uint8_t cols[4], uint8_t grps[4], uint32_t col)
-{
- int x, y;
- for (y = 0; y < height; y++) {
- if (grps)
- cols[0] = grps[3 * (y >> 1)];
- for (x = 0; x < width; x++) {
- if (grps)
- cols[1]= grps[(x >> 1) + 1];
- out[x + y*stride] = cols[col & ((1 << bpp) - 1)];
- col >>= bpp;
- }
- }
-}
-
-static int decode_frame(AVCodecContext *avctx, void *data,
- int *data_size, const uint8_t * buf, int buf_size)
-{
- C93DecoderContext * const c93 = avctx->priv_data;
- AVFrame * const newpic = &c93->pictures[c93->currentpic];
- AVFrame * const oldpic = &c93->pictures[c93->currentpic^1];
- AVFrame *picture = data;
- uint8_t *out;
- int stride, i, x, y, bt = 0;
-
- c93->currentpic ^= 1;
-
- newpic->reference = 1;
- newpic->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
- FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
- if (avctx->reget_buffer(avctx, newpic)) {
- av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
- return -1;
- }
-
- stride = newpic->linesize[0];
-
- if (buf[0] & C93_FIRST_FRAME) {
- newpic->pict_type = FF_I_TYPE;
- newpic->key_frame = 1;
- } else {
- newpic->pict_type = FF_P_TYPE;
- newpic->key_frame = 0;
- }
-
- if (*buf++ & C93_HAS_PALETTE) {
- uint32_t *palette = (uint32_t *) newpic->data[1];
- const uint8_t *palbuf = buf + buf_size - 768 - 1;
- for (i = 0; i < 256; i++) {
- palette[i] = bytestream_get_be24(&palbuf);
- }
- } else {
- if (oldpic->data[1])
- memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
- }
-
- for (y = 0; y < HEIGHT; y += 8) {
- out = newpic->data[0] + y * stride;
- for (x = 0; x < WIDTH; x += 8) {
- uint8_t *copy_from = oldpic->data[0];
- unsigned int offset, j;
- uint8_t cols[4], grps[4];
- C93BlockType block_type;
-
- if (!bt)
- bt = *buf++;
-
- block_type= bt & 0x0F;
- switch (block_type) {
- case C93_8X8_FROM_PREV:
- offset = bytestream_get_le16(&buf);
- if (copy_block(avctx, out, copy_from, offset, 8, stride))
- return -1;
- break;
-
- case C93_4X4_FROM_CURR:
- copy_from = newpic->data[0];
- case C93_4X4_FROM_PREV:
- for (j = 0; j < 8; j += 4) {
- for (i = 0; i < 8; i += 4) {
- offset = bytestream_get_le16(&buf);
- if (copy_block(avctx, &out[j*stride+i],
- copy_from, offset, 4, stride))
- return -1;
- }
- }
- break;
-
- case C93_8X8_2COLOR:
- bytestream_get_buffer(&buf, cols, 2);
- for (i = 0; i < 8; i++) {
- draw_n_color(out + i*stride, stride, 8, 1, 1, cols,
- NULL, *buf++);
- }
-
- break;
-
- case C93_4X4_2COLOR:
- case C93_4X4_4COLOR:
- case C93_4X4_4COLOR_GRP:
- for (j = 0; j < 8; j += 4) {
- for (i = 0; i < 8; i += 4) {
- if (block_type == C93_4X4_2COLOR) {
- bytestream_get_buffer(&buf, cols, 2);
- draw_n_color(out + i + j*stride, stride, 4, 4,
- 1, cols, NULL, bytestream_get_le16(&buf));
- } else if (block_type == C93_4X4_4COLOR) {
- bytestream_get_buffer(&buf, cols, 4);
- draw_n_color(out + i + j*stride, stride, 4, 4,
- 2, cols, NULL, bytestream_get_le32(&buf));
- } else {
- bytestream_get_buffer(&buf, grps, 4);
- draw_n_color(out + i + j*stride, stride, 4, 4,
- 1, cols, grps, bytestream_get_le16(&buf));
- }
- }
- }
- break;
-
- case C93_NOOP:
- break;
-
- case C93_8X8_INTRA:
- for (j = 0; j < 8; j++)
- bytestream_get_buffer(&buf, out + j*stride, 8);
- break;
-
- default:
- av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n",
- block_type, x, y);
- return -1;
- }
- bt >>= 4;
- out += 8;
- }
- }
-
- *picture = *newpic;
- *data_size = sizeof(AVFrame);
-
- return buf_size;
-}
-
-AVCodec c93_decoder = {
- "c93",
- CODEC_TYPE_VIDEO,
- CODEC_ID_C93,
- sizeof(C93DecoderContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-01 18:20:21 +0000