2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * QT 8BPS Video Decoder by Roberto Togni
25 * For more information about the 8BPS format, visit:
26 * http://www.pcisys.net/~melanson/codecs/
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)
37 #include "libavutil/intreadwrite.h"
41 static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, PIX_FMT_NONE};
46 typedef struct EightBpsContext {
48 AVCodecContext *avctx;
52 unsigned char planemap[4];
63 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
65 const uint8_t *buf = avpkt->data;
66 int buf_size = avpkt->size;
67 EightBpsContext * const c = avctx->priv_data;
68 const unsigned char *encoded = buf;
69 unsigned char *pixptr, *pixptr_end;
70 unsigned int height = avctx->height; // Real image height
71 unsigned int dlen, p, row;
72 const unsigned char *lp, *dp;
75 unsigned int planes = c->planes;
76 unsigned char *planemap = c->planemap;
79 avctx->release_buffer(avctx, &c->pic);
82 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
83 if(avctx->get_buffer(avctx, &c->pic) < 0){
84 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
88 /* Set data pointer after line lengths */
89 dp = encoded + planes * (height << 1);
91 /* Ignore alpha plane, don't know what to do with it */
95 px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGB32);
97 for (p = 0; p < planes; p++) {
98 /* Lines length pointer for this plane */
99 lp = encoded + p * (height << 1);
102 for(row = 0; row < height; row++) {
103 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
104 pixptr_end = pixptr + c->pic.linesize[0];
105 dlen = av_be2ne16(*(const unsigned short *)(lp+row*2));
106 /* Decode a row of this plane */
108 if(dp + 1 >= buf+buf_size) return -1;
109 if ((count = *dp++) <= 127) {
112 if (pixptr + count * px_inc > pixptr_end)
114 if(dp + count > buf+buf_size) return -1;
121 if (pixptr + count * px_inc > pixptr_end)
134 if (avctx->bits_per_coded_sample <= 8) {
135 const uint8_t *pal = av_packet_get_side_data(avpkt,
139 c->pic.palette_has_changed = 1;
140 memcpy(c->pal, pal, AVPALETTE_SIZE);
143 memcpy (c->pic.data[1], c->pal, AVPALETTE_SIZE);
146 *data_size = sizeof(AVFrame);
147 *(AVFrame*)data = c->pic;
149 /* always report that the buffer was completely consumed */
159 static av_cold int decode_init(AVCodecContext *avctx)
161 EightBpsContext * const c = avctx->priv_data;
165 c->pic.data[0] = NULL;
167 switch (avctx->bits_per_coded_sample) {
169 avctx->pix_fmt = PIX_FMT_PAL8;
171 c->planemap[0] = 0; // 1st plane is palette indexes
174 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
176 c->planemap[0] = 2; // 1st plane is red
177 c->planemap[1] = 1; // 2nd plane is green
178 c->planemap[2] = 0; // 3rd plane is blue
181 avctx->pix_fmt = PIX_FMT_RGB32;
184 c->planemap[0] = 1; // 1st plane is red
185 c->planemap[1] = 2; // 2nd plane is green
186 c->planemap[2] = 3; // 3rd plane is blue
187 c->planemap[3] = 0; // 4th plane is alpha???
189 c->planemap[0] = 2; // 1st plane is red
190 c->planemap[1] = 1; // 2nd plane is green
191 c->planemap[2] = 0; // 3rd plane is blue
192 c->planemap[3] = 3; // 4th plane is alpha???
196 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_coded_sample);
208 * Uninit 8BPS decoder
211 static av_cold int decode_end(AVCodecContext *avctx)
213 EightBpsContext * const c = avctx->priv_data;
216 avctx->release_buffer(avctx, &c->pic);
223 AVCodec ff_eightbps_decoder = {
227 sizeof(EightBpsContext),
233 .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),