diff options
Diffstat (limited to 'ffmpeg/libavcodec/kgv1dec.c')
| -rw-r--r-- | ffmpeg/libavcodec/kgv1dec.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/ffmpeg/libavcodec/kgv1dec.c b/ffmpeg/libavcodec/kgv1dec.c deleted file mode 100644 index 5528c6f..0000000 --- a/ffmpeg/libavcodec/kgv1dec.c +++ /dev/null @@ -1,186 +0,0 @@ -/* - * Kega Game Video (KGV1) decoder - * Copyright (c) 2010 Daniel Verkamp - * - * 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 - * Kega Game Video decoder - */ - -#include "libavutil/common.h" -#include "libavutil/intreadwrite.h" -#include "libavutil/imgutils.h" -#include "avcodec.h" -#include "internal.h" - -typedef struct { - AVFrame *prev; -} KgvContext; - -static void decode_flush(AVCodecContext *avctx) -{ - KgvContext * const c = avctx->priv_data; - - av_frame_free(&c->prev); -} - -static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, - AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - const uint8_t *buf_end = buf + avpkt->size; - KgvContext * const c = avctx->priv_data; - int offsets[8]; - uint8_t *out, *prev; - int outcnt = 0, maxcnt; - int w, h, i, res; - - if (avpkt->size < 2) - return AVERROR_INVALIDDATA; - - w = (buf[0] + 1) * 8; - h = (buf[1] + 1) * 8; - buf += 2; - - if (w != avctx->width || h != avctx->height) { - av_frame_unref(c->prev); - if ((res = ff_set_dimensions(avctx, w, h)) < 0) - return res; - } - - maxcnt = w * h; - - if ((res = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) - return res; - out = frame->data[0]; - if (c->prev->data[0]) { - prev = c->prev->data[0]; - } else { - prev = NULL; - } - - for (i = 0; i < 8; i++) - offsets[i] = -1; - - while (outcnt < maxcnt && buf_end - 2 >= buf) { - int code = AV_RL16(buf); - buf += 2; - - if (!(code & 0x8000)) { - AV_WN16A(&out[2 * outcnt], code); // rgb555 pixel coded directly - outcnt++; - } else { - int count; - - if ((code & 0x6000) == 0x6000) { - // copy from previous frame - int oidx = (code >> 10) & 7; - int start; - - count = (code & 0x3FF) + 3; - - if (offsets[oidx] < 0) { - if (buf_end - 3 < buf) - break; - offsets[oidx] = AV_RL24(buf); - buf += 3; - } - - start = (outcnt + offsets[oidx]) % maxcnt; - - if (maxcnt - start < count || maxcnt - outcnt < count) - break; - - if (!prev) { - av_log(avctx, AV_LOG_ERROR, - "Frame reference does not exist\n"); - break; - } - - memcpy(out + 2 * outcnt, prev + 2 * start, 2 * count); - } else { - // copy from earlier in this frame - int offset = (code & 0x1FFF) + 1; - - if (!(code & 0x6000)) { - count = 2; - } else if ((code & 0x6000) == 0x2000) { - count = 3; - } else { - if (buf_end - 1 < buf) - break; - count = 4 + *buf++; - } - - if (outcnt < offset || maxcnt - outcnt < count) - break; - - av_memcpy_backptr(out + 2 * outcnt, 2 * offset, 2 * count); - } - outcnt += count; - } - } - - if (outcnt - maxcnt) - av_log(avctx, AV_LOG_DEBUG, "frame finished with %d diff\n", outcnt - maxcnt); - - av_frame_unref(c->prev); - if ((res = av_frame_ref(c->prev, frame)) < 0) - return res; - - *got_frame = 1; - - return avpkt->size; -} - -static av_cold int decode_init(AVCodecContext *avctx) -{ - KgvContext * const c = avctx->priv_data; - - c->prev = av_frame_alloc(); - if (!c->prev) - return AVERROR(ENOMEM); - - avctx->pix_fmt = AV_PIX_FMT_RGB555; - avctx->flags |= CODEC_FLAG_EMU_EDGE; - - return 0; -} - -static av_cold int decode_end(AVCodecContext *avctx) -{ - KgvContext * const c = avctx->priv_data; - av_frame_free(&c->prev); - return 0; -} - -AVCodec ff_kgv1_decoder = { - .name = "kgv1", - .long_name = NULL_IF_CONFIG_SMALL("Kega Game Video"), - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_KGV1, - .priv_data_size = sizeof(KgvContext), - .init = decode_init, - .close = decode_end, - .decode = decode_frame, - .flush = decode_flush, - .capabilities = CODEC_CAP_DR1, -}; |