2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
5 * This file is part of FFmpeg.
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.
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.
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
24 * QT 8BPS Video Decoder by Roberto Togni <rtogni at bresciaonline dot it>
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)
40 static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, -1};
45 typedef struct EightBpsContext {
47 AVCodecContext *avctx;
51 unsigned char planemap[4];
60 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
62 EightBpsContext * const c = avctx->priv_data;
63 unsigned char *encoded = (unsigned char *)buf;
64 unsigned char *pixptr, *pixptr_end;
65 unsigned int height = avctx->height; // Real image height
66 unsigned int dlen, p, row;
67 unsigned char *lp, *dp;
70 unsigned int planes = c->planes;
71 unsigned char *planemap = c->planemap;
74 avctx->release_buffer(avctx, &c->pic);
77 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
78 if(avctx->get_buffer(avctx, &c->pic) < 0){
79 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
83 /* Set data pointer after line lengths */
84 dp = encoded + planes * (height << 1);
86 /* Ignore alpha plane, don't know what to do with it */
90 px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGB32);
92 for (p = 0; p < planes; p++) {
93 /* Lines length pointer for this plane */
94 lp = encoded + p * (height << 1);
97 for(row = 0; row < height; row++) {
98 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
99 pixptr_end = pixptr + c->pic.linesize[0];
100 dlen = be2me_16(*(unsigned short *)(lp+row*2));
101 /* Decode a row of this plane */
103 if(dp + 1 >= buf+buf_size) return -1;
104 if ((count = *dp++) <= 127) {
107 if (pixptr + count * px_inc > pixptr_end)
109 if(dp + count > buf+buf_size) return -1;
116 if (pixptr + count * px_inc > pixptr_end)
129 if (avctx->palctrl) {
130 memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
131 if (avctx->palctrl->palette_changed) {
132 c->pic.palette_has_changed = 1;
133 avctx->palctrl->palette_changed = 0;
135 c->pic.palette_has_changed = 0;
138 *data_size = sizeof(AVFrame);
139 *(AVFrame*)data = c->pic;
141 /* always report that the buffer was completely consumed */
151 static int decode_init(AVCodecContext *avctx)
153 EightBpsContext * const c = avctx->priv_data;
157 c->pic.data[0] = NULL;
159 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
163 switch (avctx->bits_per_sample) {
165 avctx->pix_fmt = PIX_FMT_PAL8;
167 c->planemap[0] = 0; // 1st plane is palette indexes
168 if (avctx->palctrl == NULL) {
169 av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n");
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;
183 #ifdef WORDS_BIGENDIAN
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_sample);
208 * Uninit 8BPS decoder
211 static int decode_end(AVCodecContext *avctx)
213 EightBpsContext * const c = avctx->priv_data;
216 avctx->release_buffer(avctx, &c->pic);
223 AVCodec eightbps_decoder = {
227 sizeof(EightBpsContext),