| Line | Branch | Exec | Source |
|---|---|---|---|
| 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/attributes.h" | ||
| 22 | #include "libavutil/common.h" | ||
| 23 | #include "avcodec.h" | ||
| 24 | #include "bytestream.h" | ||
| 25 | #include "codec_internal.h" | ||
| 26 | #include "decode.h" | ||
| 27 | |||
| 28 | typedef struct SimbiosisIMXContext { | ||
| 29 | AVFrame *frame; | ||
| 30 | uint32_t pal[256]; | ||
| 31 | uint8_t history[32768]; | ||
| 32 | int pos; | ||
| 33 | } SimbiosisIMXContext; | ||
| 34 | |||
| 35 | ✗ | static av_cold int imx_decode_init(AVCodecContext *avctx) | |
| 36 | { | ||
| 37 | ✗ | SimbiosisIMXContext *imx = avctx->priv_data; | |
| 38 | |||
| 39 | ✗ | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
| 40 | ✗ | avctx->width = 320; | |
| 41 | ✗ | avctx->height = 160; | |
| 42 | |||
| 43 | ✗ | imx->frame = av_frame_alloc(); | |
| 44 | ✗ | if (!imx->frame) | |
| 45 | ✗ | return AVERROR(ENOMEM); | |
| 46 | |||
| 47 | ✗ | return 0; | |
| 48 | } | ||
| 49 | |||
| 50 | ✗ | static int imx_decode_frame(AVCodecContext *avctx, AVFrame *rframe, | |
| 51 | int *got_frame, AVPacket *avpkt) | ||
| 52 | { | ||
| 53 | ✗ | SimbiosisIMXContext *imx = avctx->priv_data; | |
| 54 | int ret, x, y; | ||
| 55 | ✗ | AVFrame *frame = imx->frame; | |
| 56 | GetByteContext gb; | ||
| 57 | |||
| 58 | ✗ | if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0) | |
| 59 | ✗ | return ret; | |
| 60 | |||
| 61 | ✗ | if (ff_copy_palette(imx->pal, avpkt, avctx)) { | |
| 62 | ✗ | frame->flags |= AV_FRAME_FLAG_KEY; | |
| 63 | } else { | ||
| 64 | ✗ | frame->flags &= ~AV_FRAME_FLAG_KEY; | |
| 65 | } | ||
| 66 | |||
| 67 | ✗ | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
| 68 | |||
| 69 | ✗ | memcpy(frame->data[1], imx->pal, AVPALETTE_SIZE); | |
| 70 | |||
| 71 | ✗ | x = 0, y = 0; | |
| 72 | ✗ | while (bytestream2_get_bytes_left(&gb) > 0 && | |
| 73 | ✗ | x < 320 && y < 160) { | |
| 74 | ✗ | int b = bytestream2_get_byte(&gb); | |
| 75 | ✗ | int len = b & 0x3f; | |
| 76 | ✗ | int op = b >> 6; | |
| 77 | int fill; | ||
| 78 | |||
| 79 | ✗ | switch (op) { | |
| 80 | ✗ | case 3: | |
| 81 | ✗ | len = len * 64 + bytestream2_get_byte(&gb); | |
| 82 | av_fallthrough; | ||
| 83 | ✗ | case 0: | |
| 84 | ✗ | while (len > 0) { | |
| 85 | ✗ | x++; | |
| 86 | ✗ | len--; | |
| 87 | ✗ | if (x >= 320) { | |
| 88 | ✗ | x = 0; | |
| 89 | ✗ | y++; | |
| 90 | } | ||
| 91 | ✗ | if (y >= 160) | |
| 92 | ✗ | break; | |
| 93 | } | ||
| 94 | |||
| 95 | ✗ | frame->flags &= ~AV_FRAME_FLAG_KEY; | |
| 96 | ✗ | break; | |
| 97 | ✗ | case 1: | |
| 98 | ✗ | if (len == 0) { | |
| 99 | ✗ | int offset = bytestream2_get_le16(&gb); | |
| 100 | |||
| 101 | ✗ | if (offset < 0 || offset >= 32768) | |
| 102 | ✗ | return AVERROR_INVALIDDATA; | |
| 103 | |||
| 104 | ✗ | len = bytestream2_get_byte(&gb); | |
| 105 | ✗ | while (len > 0 && offset < 32768) { | |
| 106 | ✗ | frame->data[0][x + y * frame->linesize[0]] = imx->history[offset++]; | |
| 107 | ✗ | x++; | |
| 108 | ✗ | len--; | |
| 109 | ✗ | if (x >= 320) { | |
| 110 | ✗ | x = 0; | |
| 111 | ✗ | y++; | |
| 112 | } | ||
| 113 | ✗ | if (y >= 160) | |
| 114 | ✗ | break; | |
| 115 | } | ||
| 116 | |||
| 117 | ✗ | frame->flags &= ~AV_FRAME_FLAG_KEY; | |
| 118 | } else { | ||
| 119 | ✗ | while (len > 0) { | |
| 120 | ✗ | fill = bytestream2_get_byte(&gb); | |
| 121 | ✗ | frame->data[0][x + y * frame->linesize[0]] = fill; | |
| 122 | ✗ | if (imx->pos < 32768) | |
| 123 | ✗ | imx->history[imx->pos++] = fill; | |
| 124 | ✗ | x++; | |
| 125 | ✗ | len--; | |
| 126 | ✗ | if (x >= 320) { | |
| 127 | ✗ | x = 0; | |
| 128 | ✗ | y++; | |
| 129 | } | ||
| 130 | ✗ | if (y >= 160) | |
| 131 | ✗ | break; | |
| 132 | } | ||
| 133 | } | ||
| 134 | ✗ | break; | |
| 135 | ✗ | case 2: | |
| 136 | ✗ | fill = bytestream2_get_byte(&gb); | |
| 137 | |||
| 138 | ✗ | while (len > 0) { | |
| 139 | ✗ | frame->data[0][x + y * frame->linesize[0]] = fill; | |
| 140 | ✗ | x++; | |
| 141 | ✗ | len--; | |
| 142 | ✗ | if (x >= 320) { | |
| 143 | ✗ | x = 0; | |
| 144 | ✗ | y++; | |
| 145 | } | ||
| 146 | ✗ | if (y >= 160) | |
| 147 | ✗ | break; | |
| 148 | } | ||
| 149 | ✗ | break; | |
| 150 | } | ||
| 151 | } | ||
| 152 | |||
| 153 | ✗ | frame->pict_type = (frame->flags & AV_FRAME_FLAG_KEY) ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; | |
| 154 | |||
| 155 | ✗ | if ((ret = av_frame_ref(rframe, frame)) < 0) | |
| 156 | ✗ | return ret; | |
| 157 | |||
| 158 | ✗ | *got_frame = 1; | |
| 159 | |||
| 160 | ✗ | return avpkt->size; | |
| 161 | } | ||
| 162 | |||
| 163 | ✗ | static av_cold void imx_decode_flush(AVCodecContext *avctx) | |
| 164 | { | ||
| 165 | ✗ | SimbiosisIMXContext *imx = avctx->priv_data; | |
| 166 | |||
| 167 | ✗ | av_frame_unref(imx->frame); | |
| 168 | ✗ | imx->pos = 0; | |
| 169 | ✗ | memset(imx->pal, 0, sizeof(imx->pal)); | |
| 170 | ✗ | memset(imx->history, 0, sizeof(imx->history)); | |
| 171 | ✗ | } | |
| 172 | |||
| 173 | ✗ | static av_cold int imx_decode_close(AVCodecContext *avctx) | |
| 174 | { | ||
| 175 | ✗ | SimbiosisIMXContext *imx = avctx->priv_data; | |
| 176 | |||
| 177 | ✗ | av_frame_free(&imx->frame); | |
| 178 | |||
| 179 | ✗ | return 0; | |
| 180 | } | ||
| 181 | |||
| 182 | const FFCodec ff_simbiosis_imx_decoder = { | ||
| 183 | .p.name = "simbiosis_imx", | ||
| 184 | CODEC_LONG_NAME("Simbiosis Interactive IMX Video"), | ||
| 185 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 186 | .p.id = AV_CODEC_ID_SIMBIOSIS_IMX, | ||
| 187 | .priv_data_size = sizeof(SimbiosisIMXContext), | ||
| 188 | .init = imx_decode_init, | ||
| 189 | FF_CODEC_DECODE_CB(imx_decode_frame), | ||
| 190 | .close = imx_decode_close, | ||
| 191 | .flush = imx_decode_flush, | ||
| 192 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 193 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 194 | }; | ||
| 195 |