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Diffstat (limited to 'ffmpeg1/libavcodec/mmvideo.c')
-rw-r--r--ffmpeg1/libavcodec/mmvideo.c238
1 files changed, 0 insertions, 238 deletions
diff --git a/ffmpeg1/libavcodec/mmvideo.c b/ffmpeg1/libavcodec/mmvideo.c
deleted file mode 100644
index bf47f65..0000000
--- a/ffmpeg1/libavcodec/mmvideo.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * American Laser Games MM Video Decoder
- * Copyright (c) 2006,2008 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * American Laser Games MM Video Decoder
- * by Peter Ross (pross@xvid.org)
- *
- * 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 "libavutil/intreadwrite.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.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
-#define MM_TYPE_PALETTE 0x31
-
-typedef struct MmContext {
- AVCodecContext *avctx;
- AVFrame frame;
- int palette[AVPALETTE_COUNT];
- GetByteContext gb;
-} MmContext;
-
-static av_cold int mm_decode_init(AVCodecContext *avctx)
-{
- MmContext *s = avctx->priv_data;
-
- s->avctx = avctx;
-
- avctx->pix_fmt = AV_PIX_FMT_PAL8;
-
- avcodec_get_frame_defaults(&s->frame);
-
- return 0;
-}
-
-static int mm_decode_pal(MmContext *s)
-{
- int i;
-
- bytestream2_skip(&s->gb, 4);
- for (i = 0; i < 128; i++) {
- s->palette[i] = 0xFFU << 24 | bytestream2_get_be24(&s->gb);
- s->palette[i+128] = s->palette[i]<<2;
- }
-
- return 0;
-}
-
-/**
- * @param half_horiz Half horizontal resolution (0 or 1)
- * @param half_vert Half vertical resolution (0 or 1)
- */
-static int mm_decode_intra(MmContext * s, int half_horiz, int half_vert)
-{
- int x = 0, y = 0;
-
- while (bytestream2_get_bytes_left(&s->gb) > 0) {
- int run_length, color;
-
- if (y >= s->avctx->height)
- return 0;
-
- color = bytestream2_get_byte(&s->gb);
- if (color & 0x80) {
- run_length = 1;
- }else{
- run_length = (color & 0x7f) + 2;
- color = bytestream2_get_byte(&s->gb);
- }
-
- 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 += 1 + half_vert;
- }
- }
-
- return 0;
-}
-
-/**
- * @param half_horiz Half horizontal resolution (0 or 1)
- * @param half_vert Half vertical resolution (0 or 1)
- */
-static int mm_decode_inter(MmContext * s, int half_horiz, int half_vert)
-{
- int data_off = bytestream2_get_le16(&s->gb), y = 0;
- GetByteContext data_ptr;
-
- if (bytestream2_get_bytes_left(&s->gb) < data_off)
- return AVERROR_INVALIDDATA;
-
- bytestream2_init(&data_ptr, s->gb.buffer + data_off, bytestream2_get_bytes_left(&s->gb) - data_off);
- while (s->gb.buffer < data_ptr.buffer_start) {
- int i, j;
- int length = bytestream2_get_byte(&s->gb);
- int x = bytestream2_get_byte(&s->gb) + ((length & 0x80) << 1);
- length &= 0x7F;
-
- if (length==0) {
- y += x;
- continue;
- }
-
- if (y + half_vert >= s->avctx->height)
- return 0;
-
- for(i=0; i<length; i++) {
- int replace_array = bytestream2_get_byte(&s->gb);
- for(j=0; j<8; j++) {
- int replace = (replace_array >> (7-j)) & 1;
- if (replace) {
- int color = bytestream2_get_byte(&data_ptr);
- 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;
- }
- }
- x += 1 + half_horiz;
- }
- }
-
- y += 1 + half_vert;
- }
-
- return 0;
-}
-
-static int mm_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- MmContext *s = avctx->priv_data;
- int type, res;
-
- if (buf_size < MM_PREAMBLE_SIZE)
- return AVERROR_INVALIDDATA;
- type = AV_RL16(&buf[0]);
- buf += MM_PREAMBLE_SIZE;
- buf_size -= MM_PREAMBLE_SIZE;
- bytestream2_init(&s->gb, buf, buf_size);
-
- if ((res = ff_reget_buffer(avctx, &s->frame)) < 0)
- return res;
-
- switch(type) {
- case MM_TYPE_PALETTE : res = mm_decode_pal(s); return avpkt->size;
- case MM_TYPE_INTRA : res = mm_decode_intra(s, 0, 0); break;
- case MM_TYPE_INTRA_HH : res = mm_decode_intra(s, 1, 0); break;
- case MM_TYPE_INTRA_HHV : res = mm_decode_intra(s, 1, 1); break;
- case MM_TYPE_INTER : res = mm_decode_inter(s, 0, 0); break;
- case MM_TYPE_INTER_HH : res = mm_decode_inter(s, 1, 0); break;
- case MM_TYPE_INTER_HHV : res = mm_decode_inter(s, 1, 1); break;
- default:
- res = AVERROR_INVALIDDATA;
- break;
- }
- if (res < 0)
- return res;
-
- memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
-
- if ((res = av_frame_ref(data, &s->frame)) < 0)
- return res;
-
- *got_frame = 1;
-
- return avpkt->size;
-}
-
-static av_cold int mm_decode_end(AVCodecContext *avctx)
-{
- MmContext *s = avctx->priv_data;
-
- av_frame_unref(&s->frame);
-
- return 0;
-}
-
-AVCodec ff_mmvideo_decoder = {
- .name = "mmvideo",
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_MMVIDEO,
- .priv_data_size = sizeof(MmContext),
- .init = mm_decode_init,
- .close = mm_decode_end,
- .decode = mm_decode_frame,
- .capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("American Laser Games MM Video"),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 17:34:08 +0000