| 1 | /* |
| 2 | * Quicktime Planar RGB (8BPS) Video Decoder |
| 3 | * Copyright (C) 2003 Roberto Togni |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * QT 8BPS Video Decoder by Roberto Togni |
| 25 | * For more information about the 8BPS format, visit: |
| 26 | * http://www.pcisys.net/~melanson/codecs/ |
| 27 | * |
| 28 | * Supports: PAL8 (RGB 8bpp, paletted) |
| 29 | * : BGR24 (RGB 24bpp) (can also output it as RGB32) |
| 30 | * : RGB32 (RGB 32bpp, 4th plane is alpha) |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include <stdio.h> |
| 35 | #include <stdlib.h> |
| 36 | #include <string.h> |
| 37 | |
| 38 | #include "libavutil/internal.h" |
| 39 | #include "libavutil/intreadwrite.h" |
| 40 | #include "avcodec.h" |
| 41 | #include "internal.h" |
| 42 | |
| 43 | |
| 44 | static const enum AVPixelFormat pixfmt_rgb24[] = { |
| 45 | AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE }; |
| 46 | |
| 47 | typedef struct EightBpsContext { |
| 48 | AVCodecContext *avctx; |
| 49 | |
| 50 | unsigned char planes; |
| 51 | unsigned char planemap[4]; |
| 52 | |
| 53 | uint32_t pal[256]; |
| 54 | } EightBpsContext; |
| 55 | |
| 56 | static int decode_frame(AVCodecContext *avctx, void *data, |
| 57 | int *got_frame, AVPacket *avpkt) |
| 58 | { |
| 59 | AVFrame *frame = data; |
| 60 | const uint8_t *buf = avpkt->data; |
| 61 | int buf_size = avpkt->size; |
| 62 | EightBpsContext * const c = avctx->priv_data; |
| 63 | const unsigned char *encoded = buf; |
| 64 | unsigned char *pixptr, *pixptr_end; |
| 65 | unsigned int height = avctx->height; // Real image height |
| 66 | unsigned int dlen, p, row; |
| 67 | const unsigned char *lp, *dp, *ep; |
| 68 | unsigned char count; |
| 69 | unsigned int planes = c->planes; |
| 70 | unsigned char *planemap = c->planemap; |
| 71 | int ret; |
| 72 | |
| 73 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 74 | return ret; |
| 75 | |
| 76 | ep = encoded + buf_size; |
| 77 | |
| 78 | /* Set data pointer after line lengths */ |
| 79 | dp = encoded + planes * (height << 1); |
| 80 | |
| 81 | for (p = 0; p < planes; p++) { |
| 82 | /* Lines length pointer for this plane */ |
| 83 | lp = encoded + p * (height << 1); |
| 84 | |
| 85 | /* Decode a plane */ |
| 86 | for (row = 0; row < height; row++) { |
| 87 | pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p]; |
| 88 | pixptr_end = pixptr + frame->linesize[0]; |
| 89 | if (ep - lp < row * 2 + 2) |
| 90 | return AVERROR_INVALIDDATA; |
| 91 | dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2)); |
| 92 | /* Decode a row of this plane */ |
| 93 | while (dlen > 0) { |
| 94 | if (ep - dp <= 1) |
| 95 | return AVERROR_INVALIDDATA; |
| 96 | if ((count = *dp++) <= 127) { |
| 97 | count++; |
| 98 | dlen -= count + 1; |
| 99 | if (pixptr_end - pixptr < count * planes) |
| 100 | break; |
| 101 | if (ep - dp < count) |
| 102 | return AVERROR_INVALIDDATA; |
| 103 | while (count--) { |
| 104 | *pixptr = *dp++; |
| 105 | pixptr += planes; |
| 106 | } |
| 107 | } else { |
| 108 | count = 257 - count; |
| 109 | if (pixptr_end - pixptr < count * planes) |
| 110 | break; |
| 111 | while (count--) { |
| 112 | *pixptr = *dp; |
| 113 | pixptr += planes; |
| 114 | } |
| 115 | dp++; |
| 116 | dlen -= 2; |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | if (avctx->bits_per_coded_sample <= 8) { |
| 123 | const uint8_t *pal = av_packet_get_side_data(avpkt, |
| 124 | AV_PKT_DATA_PALETTE, |
| 125 | NULL); |
| 126 | if (pal) { |
| 127 | frame->palette_has_changed = 1; |
| 128 | memcpy(c->pal, pal, AVPALETTE_SIZE); |
| 129 | } |
| 130 | |
| 131 | memcpy (frame->data[1], c->pal, AVPALETTE_SIZE); |
| 132 | } |
| 133 | |
| 134 | *got_frame = 1; |
| 135 | |
| 136 | /* always report that the buffer was completely consumed */ |
| 137 | return buf_size; |
| 138 | } |
| 139 | |
| 140 | static av_cold int decode_init(AVCodecContext *avctx) |
| 141 | { |
| 142 | EightBpsContext * const c = avctx->priv_data; |
| 143 | |
| 144 | c->avctx = avctx; |
| 145 | |
| 146 | switch (avctx->bits_per_coded_sample) { |
| 147 | case 8: |
| 148 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 149 | c->planes = 1; |
| 150 | c->planemap[0] = 0; // 1st plane is palette indexes |
| 151 | break; |
| 152 | case 24: |
| 153 | avctx->pix_fmt = ff_get_format(avctx, pixfmt_rgb24); |
| 154 | c->planes = 3; |
| 155 | c->planemap[0] = 2; // 1st plane is red |
| 156 | c->planemap[1] = 1; // 2nd plane is green |
| 157 | c->planemap[2] = 0; // 3rd plane is blue |
| 158 | break; |
| 159 | case 32: |
| 160 | avctx->pix_fmt = AV_PIX_FMT_RGB32; |
| 161 | c->planes = 4; |
| 162 | /* handle planemap setup later for decoding rgb24 data as rbg32 */ |
| 163 | break; |
| 164 | default: |
| 165 | av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", |
| 166 | avctx->bits_per_coded_sample); |
| 167 | return AVERROR_INVALIDDATA; |
| 168 | } |
| 169 | |
| 170 | if (avctx->pix_fmt == AV_PIX_FMT_RGB32) { |
| 171 | c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2; // 1st plane is red |
| 172 | c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1; // 2nd plane is green |
| 173 | c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0; // 3rd plane is blue |
| 174 | c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3; // 4th plane is alpha |
| 175 | } |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | AVCodec ff_eightbps_decoder = { |
| 180 | .name = "8bps", |
| 181 | .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"), |
| 182 | .type = AVMEDIA_TYPE_VIDEO, |
| 183 | .id = AV_CODEC_ID_8BPS, |
| 184 | .priv_data_size = sizeof(EightBpsContext), |
| 185 | .init = decode_init, |
| 186 | .decode = decode_frame, |
| 187 | .capabilities = CODEC_CAP_DR1, |
| 188 | }; |