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| 1 | +/* |
| 2 | + * Copyright (c) 2021 Paul B Mahol |
| 3 | + * |
| 4 | + * This file is part of FFmpeg. |
| 5 | + * |
| 6 | + * FFmpeg is free software; you can redistribute it and/or |
| 7 | + * modify it under the terms of the GNU Lesser General Public |
| 8 | + * License as published by the Free Software Foundation; either |
| 9 | + * version 2.1 of the License, or (at your option) any later version. |
| 10 | + * |
| 11 | + * FFmpeg is distributed in the hope that it will be useful, |
| 12 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | + * Lesser General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU Lesser General Public |
| 17 | + * License along with FFmpeg; if not, write to the Free Software |
| 18 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | + */ |
| 20 | + |
| 21 | +#include "libavutil/common.h" |
| 22 | +#include "avcodec.h" |
| 23 | +#include "bytestream.h" |
| 24 | +#include "internal.h" |
| 25 | + |
| 26 | +typedef struct SimbiosisIMXContext { |
| 27 | + uint32_t pal[256]; |
| 28 | + uint8_t history[32768]; |
| 29 | + int pos; |
| 30 | +} SimbiosisIMXContext; |
| 31 | + |
| 32 | +static av_cold int imx_decode_init(AVCodecContext *avctx) |
| 33 | +{ |
| 34 | + avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 35 | + avctx->width = 320; |
| 36 | + avctx->height = 160; |
| 37 | + return 0; |
| 38 | +} |
| 39 | + |
| 40 | +static int imx_decode_frame(AVCodecContext *avctx, void *data, |
| 41 | + int *got_frame, AVPacket *avpkt) |
| 42 | +{ |
| 43 | + SimbiosisIMXContext *imx = avctx->priv_data; |
| 44 | + int ret, x, y, pal_size; |
| 45 | + const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size); |
| 46 | + AVFrame *frame = data; |
| 47 | + GetByteContext gb; |
| 48 | + |
| 49 | + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 50 | + return ret; |
| 51 | + |
| 52 | + if (pal && pal_size == AVPALETTE_SIZE) { |
| 53 | + memcpy(imx->pal, pal, pal_size); |
| 54 | + frame->palette_has_changed = 1; |
| 55 | + } |
| 56 | + |
| 57 | + bytestream2_init(&gb, avpkt->data, avpkt->size); |
| 58 | + |
| 59 | + memcpy(frame->data[1], imx->pal, AVPALETTE_SIZE); |
| 60 | + |
| 61 | + x = 0, y = 0; |
| 62 | + while (bytestream2_get_bytes_left(&gb) > 0 && |
| 63 | + x < 320 && y < 160) { |
| 64 | + int b = bytestream2_get_byte(&gb); |
| 65 | + int len = b & 0x3f; |
| 66 | + int op = b >> 6; |
| 67 | + int fill; |
| 68 | + |
| 69 | + switch (op) { |
| 70 | + case 3: |
| 71 | + len = len * 64 + bytestream2_get_byte(&gb); |
| 72 | + case 0: |
| 73 | + while (len > 0) { |
| 74 | + x++; |
| 75 | + len--; |
| 76 | + if (x >= 320) { |
| 77 | + x = 0; |
| 78 | + y++; |
| 79 | + } |
| 80 | + if (y >= 160) |
| 81 | + break; |
| 82 | + } |
| 83 | + break; |
| 84 | + case 1: |
| 85 | + if (len == 0) { |
| 86 | + int offset = bytestream2_get_le16(&gb); |
| 87 | + |
| 88 | + if (offset < 0 || offset >= 32768) |
| 89 | + return AVERROR_INVALIDDATA; |
| 90 | + |
| 91 | + len = bytestream2_get_byte(&gb); |
| 92 | + while (len > 0 && offset < 32768) { |
| 93 | + frame->data[0][x + y * frame->linesize[0]] = imx->history[offset++]; |
| 94 | + x++; |
| 95 | + len--; |
| 96 | + if (x >= 320) { |
| 97 | + x = 0; |
| 98 | + y++; |
| 99 | + } |
| 100 | + if (y >= 160) |
| 101 | + break; |
| 102 | + } |
| 103 | + } else { |
| 104 | + while (len > 0) { |
| 105 | + fill = bytestream2_get_byte(&gb); |
| 106 | + frame->data[0][x + y * frame->linesize[0]] = fill; |
| 107 | + if (imx->pos < 32768) |
| 108 | + imx->history[imx->pos++] = fill; |
| 109 | + x++; |
| 110 | + len--; |
| 111 | + if (x >= 320) { |
| 112 | + x = 0; |
| 113 | + y++; |
| 114 | + } |
| 115 | + if (y >= 160) |
| 116 | + break; |
| 117 | + } |
| 118 | + } |
| 119 | + break; |
| 120 | + case 2: |
| 121 | + fill = bytestream2_get_byte(&gb); |
| 122 | + |
| 123 | + while (len > 0) { |
| 124 | + frame->data[0][x + y * frame->linesize[0]] = fill; |
| 125 | + x++; |
| 126 | + len--; |
| 127 | + if (x >= 320) { |
| 128 | + x = 0; |
| 129 | + y++; |
| 130 | + } |
| 131 | + if (y >= 160) |
| 132 | + break; |
| 133 | + } |
| 134 | + break; |
| 135 | + } |
| 136 | + } |
| 137 | + |
| 138 | + *got_frame = 1; |
| 139 | + |
| 140 | + return avpkt->size; |
| 141 | +} |
| 142 | + |
| 143 | +AVCodec ff_simbiosis_imx_decoder = { |
| 144 | + .name = "simbiosis_imx", |
| 145 | + .long_name = NULL_IF_CONFIG_SMALL("Simbiosis Interactive IMX Video"), |
| 146 | + .type = AVMEDIA_TYPE_VIDEO, |
| 147 | + .id = AV_CODEC_ID_SIMBIOSIS_IMX, |
| 148 | + .priv_data_size = sizeof(SimbiosisIMXContext), |
| 149 | + .init = imx_decode_init, |
| 150 | + .decode = imx_decode_frame, |
| 151 | + .capabilities = AV_CODEC_CAP_DR1, |
| 152 | + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| 153 | +}; |