diff options
Diffstat (limited to 'ffmpeg/libavcodec/c93.c')
| -rw-r--r-- | ffmpeg/libavcodec/c93.c | 272 |
1 files changed, 0 insertions, 272 deletions
diff --git a/ffmpeg/libavcodec/c93.c b/ffmpeg/libavcodec/c93.c deleted file mode 100644 index ad3fa3b..0000000 --- a/ffmpeg/libavcodec/c93.c +++ /dev/null @@ -1,272 +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" -#include "internal.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 av_cold int decode_end(AVCodecContext *avctx) -{ - C93DecoderContext * const c93 = avctx->priv_data; - - av_frame_free(&c93->pictures[0]); - av_frame_free(&c93->pictures[1]); - - return 0; -} - -static av_cold int decode_init(AVCodecContext *avctx) -{ - C93DecoderContext *s = avctx->priv_data; - avctx->pix_fmt = AV_PIX_FMT_PAL8; - - s->pictures[0] = av_frame_alloc(); - s->pictures[1] = av_frame_alloc(); - if (!s->pictures[0] || !s->pictures[1]) { - decode_end(avctx); - return AVERROR(ENOMEM); - } - - 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 AVERROR_INVALIDDATA; - } - - 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 *got_frame, AVPacket *avpkt) -{ - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - C93DecoderContext * const c93 = avctx->priv_data; - AVFrame * const newpic = c93->pictures[c93->currentpic]; - AVFrame * const oldpic = c93->pictures[c93->currentpic^1]; - GetByteContext gb; - uint8_t *out; - int stride, ret, i, x, y, b, bt = 0; - - if ((ret = ff_set_dimensions(avctx, WIDTH, HEIGHT)) < 0) - return ret; - - c93->currentpic ^= 1; - - if ((ret = ff_reget_buffer(avctx, newpic)) < 0) - return ret; - - stride = newpic->linesize[0]; - - bytestream2_init(&gb, buf, buf_size); - b = bytestream2_get_byte(&gb); - if (b & C93_FIRST_FRAME) { - newpic->pict_type = AV_PICTURE_TYPE_I; - newpic->key_frame = 1; - } else { - newpic->pict_type = AV_PICTURE_TYPE_P; - newpic->key_frame = 0; - } - - 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 = bytestream2_get_byte(&gb); - - block_type= bt & 0x0F; - switch (block_type) { - case C93_8X8_FROM_PREV: - offset = bytestream2_get_le16(&gb); - if ((ret = copy_block(avctx, out, copy_from, offset, 8, stride)) < 0) - return ret; - 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) { - int offset = bytestream2_get_le16(&gb); - int from_x = offset % WIDTH; - int from_y = offset / WIDTH; - if (block_type == C93_4X4_FROM_CURR && from_y == y+j && - (FFABS(from_x - x-i) < 4 || FFABS(from_x - x-i) > WIDTH-4)) { - avpriv_request_sample(avctx, "block overlap %d %d %d %d\n", from_x, x+i, from_y, y+j); - return AVERROR_INVALIDDATA; - } - if ((ret = copy_block(avctx, &out[j*stride+i], - copy_from, offset, 4, stride)) < 0) - return ret; - } - } - break; - - case C93_8X8_2COLOR: - bytestream2_get_buffer(&gb, cols, 2); - for (i = 0; i < 8; i++) { - draw_n_color(out + i*stride, stride, 8, 1, 1, cols, - NULL, bytestream2_get_byte(&gb)); - } - - 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) { - bytestream2_get_buffer(&gb, cols, 2); - draw_n_color(out + i + j*stride, stride, 4, 4, - 1, cols, NULL, bytestream2_get_le16(&gb)); - } else if (block_type == C93_4X4_4COLOR) { - bytestream2_get_buffer(&gb, cols, 4); - draw_n_color(out + i + j*stride, stride, 4, 4, - 2, cols, NULL, bytestream2_get_le32(&gb)); - } else { - bytestream2_get_buffer(&gb, grps, 4); - draw_n_color(out + i + j*stride, stride, 4, 4, - 1, cols, grps, bytestream2_get_le16(&gb)); - } - } - } - break; - - case C93_NOOP: - break; - - case C93_8X8_INTRA: - for (j = 0; j < 8; j++) - bytestream2_get_buffer(&gb, out + j*stride, 8); - break; - - default: - av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n", - block_type, x, y); - return AVERROR_INVALIDDATA; - } - bt >>= 4; - out += 8; - } - } - - if (b & C93_HAS_PALETTE) { - uint32_t *palette = (uint32_t *) newpic->data[1]; - for (i = 0; i < 256; i++) { - palette[i] = 0xFFU << 24 | bytestream2_get_be24(&gb); - } - newpic->palette_has_changed = 1; - } else { - if (oldpic->data[1]) - memcpy(newpic->data[1], oldpic->data[1], 256 * 4); - } - - if ((ret = av_frame_ref(data, newpic)) < 0) - return ret; - *got_frame = 1; - - return buf_size; -} - -AVCodec ff_c93_decoder = { - .name = "c93", - .long_name = NULL_IF_CONFIG_SMALL("Interplay C93"), - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_C93, - .priv_data_size = sizeof(C93DecoderContext), - .init = decode_init, - .close = decode_end, - .decode = decode_frame, - .capabilities = CODEC_CAP_DR1, -}; 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