diff options
Diffstat (limited to 'src/libffmpeg/libavcodec/mmvideo.c')
| -rw-r--r-- | src/libffmpeg/libavcodec/mmvideo.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/src/libffmpeg/libavcodec/mmvideo.c b/src/libffmpeg/libavcodec/mmvideo.c deleted file mode 100644 index 7ba1321cb..000000000 --- a/src/libffmpeg/libavcodec/mmvideo.c +++ /dev/null @@ -1,206 +0,0 @@ -/* - * American Laser Games MM Video Decoder - * Copyright (c) 2006 Peter Ross - * - * 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 St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file mm.c - * American Laser Games MM Video Decoder - * by Peter Ross (suxen_drol at hotmail dot com) - * - * The MM format was used by IBM-PC ports of ALG's "arcade shooter" games, - * including Mad Dog McCree and Crime Patrol. - * - * Technical details here: - * http://wiki.multimedia.cx/index.php?title=American_Laser_Games_MM - */ - -#include "avcodec.h" - -#define MM_PREAMBLE_SIZE 6 - -#define MM_TYPE_INTER 0x5 -#define MM_TYPE_INTRA 0x8 -#define MM_TYPE_INTRA_HH 0xc -#define MM_TYPE_INTER_HH 0xd -#define MM_TYPE_INTRA_HHV 0xe -#define MM_TYPE_INTER_HHV 0xf - -typedef struct MmContext { - AVCodecContext *avctx; - AVFrame frame; -} MmContext; - -static int mm_decode_init(AVCodecContext *avctx) -{ - MmContext *s = avctx->priv_data; - - s->avctx = avctx; - - if (s->avctx->palctrl == NULL) { - av_log(avctx, AV_LOG_ERROR, "mmvideo: palette expected.\n"); - return -1; - } - - avctx->pix_fmt = PIX_FMT_PAL8; - avctx->has_b_frames = 0; - - if (avcodec_check_dimensions(avctx, avctx->width, avctx->height)) - return -1; - - s->frame.reference = 1; - if (avctx->get_buffer(avctx, &s->frame)) { - av_log(s->avctx, AV_LOG_ERROR, "mmvideo: get_buffer() failed\n"); - return -1; - } - - return 0; -} - -static void mm_decode_intra(MmContext * s, int half_horiz, int half_vert, const uint8_t *buf, int buf_size) -{ - int i, x, y; - i=0; x=0; y=0; - - while(i<buf_size) { - int run_length, color; - - if (buf[i] & 0x80) { - run_length = 1; - color = buf[i]; - i++; - }else{ - run_length = (buf[i] & 0x7f) + 2; - color = buf[i+1]; - i+=2; - } - - if (half_horiz) - run_length *=2; - - if (color) { - memset(s->frame.data[0] + y*s->frame.linesize[0] + x, color, run_length); - if (half_vert) - memset(s->frame.data[0] + (y+1)*s->frame.linesize[0] + x, color, run_length); - } - x+= run_length; - - if (x >= s->avctx->width) { - x=0; - y += half_vert ? 2 : 1; - } - } -} - -static void mm_decode_inter(MmContext * s, int half_horiz, int half_vert, const uint8_t *buf, int buf_size) -{ - const int data_ptr = 2 + AV_RL16(&buf[0]); - int d, r, y; - d = data_ptr; r = 2; y = 0; - - while(r < data_ptr) { - int i, j; - int length = buf[r] & 0x7f; - int x = buf[r+1] + ((buf[r] & 0x80) << 1); - r += 2; - - if (length==0) { - y += x; - continue; - } - - for(i=0; i<length; i++) { - for(j=0; j<8; j++) { - int replace = (buf[r+i] >> (7-j)) & 1; - if (replace) { - int color = buf[d]; - s->frame.data[0][y*s->frame.linesize[0] + x] = color; - if (half_horiz) - s->frame.data[0][y*s->frame.linesize[0] + x + 1] = color; - if (half_vert) { - s->frame.data[0][(y+1)*s->frame.linesize[0] + x] = color; - if (half_horiz) - s->frame.data[0][(y+1)*s->frame.linesize[0] + x + 1] = color; - } - d++; - } - x += half_horiz ? 2 : 1; - } - } - - r += length; - y += half_vert ? 2 : 1; - } -} - -static int mm_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - MmContext *s = avctx->priv_data; - AVPaletteControl *palette_control = avctx->palctrl; - int type; - - if (palette_control->palette_changed) { - memcpy(s->frame.data[1], palette_control->palette, AVPALETTE_SIZE); - palette_control->palette_changed = 0; - } - - type = AV_RL16(&buf[0]); - buf += MM_PREAMBLE_SIZE; - buf_size -= MM_PREAMBLE_SIZE; - - switch(type) { - case MM_TYPE_INTRA : mm_decode_intra(s, 0, 0, buf, buf_size); break; - case MM_TYPE_INTRA_HH : mm_decode_intra(s, 1, 0, buf, buf_size); break; - case MM_TYPE_INTRA_HHV : mm_decode_intra(s, 1, 1, buf, buf_size); break; - case MM_TYPE_INTER : mm_decode_inter(s, 0, 0, buf, buf_size); break; - case MM_TYPE_INTER_HH : mm_decode_inter(s, 1, 0, buf, buf_size); break; - case MM_TYPE_INTER_HHV : mm_decode_inter(s, 1, 1, buf, buf_size); break; - default : - return -1; - } - - *data_size = sizeof(AVFrame); - *(AVFrame*)data = s->frame; - - return buf_size; -} - -static int mm_decode_end(AVCodecContext *avctx) -{ - MmContext *s = avctx->priv_data; - - if(s->frame.data[0]) - avctx->release_buffer(avctx, &s->frame); - - return 0; -} - -AVCodec mmvideo_decoder = { - "mmvideo", - CODEC_TYPE_VIDEO, - CODEC_ID_MMVIDEO, - sizeof(MmContext), - mm_decode_init, - NULL, - mm_decode_end, - mm_decode_frame, - CODEC_CAP_DR1, -}; |