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 probably alpha and it's ignored) 31 * 32 */ 33 34#include <stdio.h> 35#include <stdlib.h> 36 37#include "libavutil/intreadwrite.h" 38#include "avcodec.h" 39 40 41static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, PIX_FMT_NONE}; 42 43/* 44 * Decoder context 45 */ 46typedef struct EightBpsContext { 47 48 AVCodecContext *avctx; 49 AVFrame pic; 50 51 unsigned char planes; 52 unsigned char planemap[4]; 53} EightBpsContext; 54 55 56/* 57 * 58 * Decode a frame 59 * 60 */ 61static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) 62{ 63 const uint8_t *buf = avpkt->data; 64 int buf_size = avpkt->size; 65 EightBpsContext * const c = avctx->priv_data; 66 const unsigned char *encoded = buf; 67 unsigned char *pixptr, *pixptr_end; 68 unsigned int height = avctx->height; // Real image height 69 unsigned int dlen, p, row; 70 const unsigned char *lp, *dp; 71 unsigned char count; 72 unsigned int px_inc; 73 unsigned int planes = c->planes; 74 unsigned char *planemap = c->planemap; 75 76 if(c->pic.data[0]) 77 avctx->release_buffer(avctx, &c->pic); 78 79 c->pic.reference = 0; 80 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; 81 if(avctx->get_buffer(avctx, &c->pic) < 0){ 82 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 83 return -1; 84 } 85 86 /* Set data pointer after line lengths */ 87 dp = encoded + planes * (height << 1); 88 89 /* Ignore alpha plane, don't know what to do with it */ 90 if (planes == 4) 91 planes--; 92 93 px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGB32); 94 95 for (p = 0; p < planes; p++) { 96 /* Lines length pointer for this plane */ 97 lp = encoded + p * (height << 1); 98 99 /* Decode a plane */ 100 for(row = 0; row < height; row++) { 101 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p]; 102 pixptr_end = pixptr + c->pic.linesize[0]; 103 dlen = be2me_16(*(const unsigned short *)(lp+row*2)); 104 /* Decode a row of this plane */ 105 while(dlen > 0) { 106 if(dp + 1 >= buf+buf_size) return -1; 107 if ((count = *dp++) <= 127) { 108 count++; 109 dlen -= count + 1; 110 if (pixptr + count * px_inc > pixptr_end) 111 break; 112 if(dp + count > buf+buf_size) return -1; 113 while(count--) { 114 *pixptr = *dp++; 115 pixptr += px_inc; 116 } 117 } else { 118 count = 257 - count; 119 if (pixptr + count * px_inc > pixptr_end) 120 break; 121 while(count--) { 122 *pixptr = *dp; 123 pixptr += px_inc; 124 } 125 dp++; 126 dlen -= 2; 127 } 128 } 129 } 130 } 131 132 if (avctx->palctrl) { 133 memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE); 134 if (avctx->palctrl->palette_changed) { 135 c->pic.palette_has_changed = 1; 136 avctx->palctrl->palette_changed = 0; 137 } else 138 c->pic.palette_has_changed = 0; 139 } 140 141 *data_size = sizeof(AVFrame); 142 *(AVFrame*)data = c->pic; 143 144 /* always report that the buffer was completely consumed */ 145 return buf_size; 146} 147 148 149/* 150 * 151 * Init 8BPS decoder 152 * 153 */ 154static av_cold int decode_init(AVCodecContext *avctx) 155{ 156 EightBpsContext * const c = avctx->priv_data; 157 158 c->avctx = avctx; 159 160 c->pic.data[0] = NULL; 161 162 switch (avctx->bits_per_coded_sample) { 163 case 8: 164 avctx->pix_fmt = PIX_FMT_PAL8; 165 c->planes = 1; 166 c->planemap[0] = 0; // 1st plane is palette indexes 167 if (avctx->palctrl == NULL) { 168 av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n"); 169 return -1; 170 } 171 break; 172 case 24: 173 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24); 174 c->planes = 3; 175 c->planemap[0] = 2; // 1st plane is red 176 c->planemap[1] = 1; // 2nd plane is green 177 c->planemap[2] = 0; // 3rd plane is blue 178 break; 179 case 32: 180 avctx->pix_fmt = PIX_FMT_RGB32; 181 c->planes = 4; 182#if HAVE_BIGENDIAN 183 c->planemap[0] = 1; // 1st plane is red 184 c->planemap[1] = 2; // 2nd plane is green 185 c->planemap[2] = 3; // 3rd plane is blue 186 c->planemap[3] = 0; // 4th plane is alpha??? 187#else 188 c->planemap[0] = 2; // 1st plane is red 189 c->planemap[1] = 1; // 2nd plane is green 190 c->planemap[2] = 0; // 3rd plane is blue 191 c->planemap[3] = 3; // 4th plane is alpha??? 192#endif 193 break; 194 default: 195 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_coded_sample); 196 return -1; 197 } 198 199 return 0; 200} 201 202 203 204 205/* 206 * 207 * Uninit 8BPS decoder 208 * 209 */ 210static av_cold int decode_end(AVCodecContext *avctx) 211{ 212 EightBpsContext * const c = avctx->priv_data; 213 214 if (c->pic.data[0]) 215 avctx->release_buffer(avctx, &c->pic); 216 217 return 0; 218} 219 220 221 222AVCodec eightbps_decoder = { 223 "8bps", 224 AVMEDIA_TYPE_VIDEO, 225 CODEC_ID_8BPS, 226 sizeof(EightBpsContext), 227 decode_init, 228 NULL, 229 decode_end, 230 decode_frame, 231 CODEC_CAP_DR1, 232 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"), 233}; 234