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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
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* 8088flex TMV video decoder
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* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* 8088flex TMV video decoder
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* @author Daniel Verkamp
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* @see http://www.oldskool.org/pc/8088_Corruption
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*/
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#include <string.h>
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "internal.h"
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#include "libavutil/internal.h"
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#include "libavutil/xga_font_data.h"
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#include "cga_data.h"
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static int tmv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *src = avpkt->data;
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uint8_t *dst;
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unsigned char_cols = avctx->width >> 3;
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unsigned char_rows = avctx->height >> 3;
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unsigned x, y, fg, bg, c;
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int ret;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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if (avpkt->size < 2*char_rows*char_cols) {
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av_log(avctx, AV_LOG_ERROR,
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"Input buffer too small, truncated sample?\n");
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*got_frame = 0;
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return AVERROR_INVALIDDATA;
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}
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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dst = frame->data[0];
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frame->palette_has_changed = 1;
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memcpy(frame->data[1], ff_cga_palette, 16 * 4);
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memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4);
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for (y = 0; y < char_rows; y++) {
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for (x = 0; x < char_cols; x++) {
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c = *src++;
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bg = *src >> 4;
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fg = *src++ & 0xF;
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ff_draw_pc_font(dst + x * 8, frame->linesize[0],
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avpriv_cga_font, 8, c, fg, bg);
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}
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dst += frame->linesize[0] * 8;
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}
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int tmv_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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return 0;
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}
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const FFCodec ff_tmv_decoder = {
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.p.name = "tmv",
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.p.long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_TMV,
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.init = tmv_decode_init,
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FF_CODEC_DECODE_CB(tmv_decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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