mirror of https://git.ffmpeg.org/ffmpeg.git
154 lines
4.5 KiB
C
154 lines
4.5 KiB
C
/*
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* Copyright (c) 2021 Paul B Mahol
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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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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct SimbiosisIMXContext {
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uint32_t pal[256];
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uint8_t history[32768];
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int pos;
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} SimbiosisIMXContext;
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static av_cold int imx_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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avctx->width = 320;
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avctx->height = 160;
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return 0;
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}
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static int imx_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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SimbiosisIMXContext *imx = avctx->priv_data;
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int ret, x, y, pal_size;
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
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AVFrame *frame = data;
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GetByteContext gb;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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if (pal && pal_size == AVPALETTE_SIZE) {
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memcpy(imx->pal, pal, pal_size);
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frame->palette_has_changed = 1;
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}
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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memcpy(frame->data[1], imx->pal, AVPALETTE_SIZE);
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x = 0, y = 0;
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while (bytestream2_get_bytes_left(&gb) > 0 &&
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x < 320 && y < 160) {
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int b = bytestream2_get_byte(&gb);
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int len = b & 0x3f;
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int op = b >> 6;
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int fill;
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switch (op) {
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case 3:
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len = len * 64 + bytestream2_get_byte(&gb);
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case 0:
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while (len > 0) {
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x++;
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len--;
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if (x >= 320) {
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x = 0;
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y++;
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}
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if (y >= 160)
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break;
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}
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break;
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case 1:
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if (len == 0) {
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int offset = bytestream2_get_le16(&gb);
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if (offset < 0 || offset >= 32768)
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return AVERROR_INVALIDDATA;
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len = bytestream2_get_byte(&gb);
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while (len > 0 && offset < 32768) {
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frame->data[0][x + y * frame->linesize[0]] = imx->history[offset++];
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x++;
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len--;
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if (x >= 320) {
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x = 0;
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y++;
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}
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if (y >= 160)
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break;
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}
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} else {
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while (len > 0) {
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fill = bytestream2_get_byte(&gb);
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frame->data[0][x + y * frame->linesize[0]] = fill;
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if (imx->pos < 32768)
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imx->history[imx->pos++] = fill;
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x++;
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len--;
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if (x >= 320) {
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x = 0;
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y++;
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}
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if (y >= 160)
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break;
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}
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}
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break;
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case 2:
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fill = bytestream2_get_byte(&gb);
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while (len > 0) {
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frame->data[0][x + y * frame->linesize[0]] = fill;
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x++;
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len--;
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if (x >= 320) {
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x = 0;
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y++;
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}
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if (y >= 160)
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break;
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}
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break;
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}
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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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AVCodec ff_simbiosis_imx_decoder = {
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.name = "simbiosis_imx",
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.long_name = NULL_IF_CONFIG_SMALL("Simbiosis Interactive IMX Video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SIMBIOSIS_IMX,
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.priv_data_size = sizeof(SimbiosisIMXContext),
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.init = imx_decode_init,
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.decode = imx_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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