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
25 * QT 8BPS Video Decoder by Roberto Togni <rtogni at bresciaonline dot it>
26 * For more information about the 8BPS format, visit:
27 * http://www.pcisys.net/~melanson/codecs/
29 * Supports: PAL8 (RGB 8bpp, paletted)
30 * : BGR24 (RGB 24bpp) (can also output it as RGB32)
31 * : RGB32 (RGB 32bpp, 4th plane is probably alpha and it's ignored)
42 static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, -1};
47 typedef struct EightBpsContext {
49 AVCodecContext *avctx;
53 unsigned char planemap[4];
62 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
64 EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
65 unsigned char *encoded = (unsigned char *)buf;
66 unsigned char *pixptr, *pixptr_end;
67 unsigned int height = avctx->height; // Real image height
68 unsigned int dlen, p, row;
69 unsigned char *lp, *dp;
72 unsigned int planes = c->planes;
73 unsigned char *planemap = c->planemap;
76 avctx->release_buffer(avctx, &c->pic);
79 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
80 if(avctx->get_buffer(avctx, &c->pic) < 0){
81 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
85 /* Set data pointer after line lengths */
86 dp = encoded + planes * (height << 1);
88 /* Ignore alpha plane, don't know what to do with it */
92 px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGB32);
94 for (p = 0; p < planes; p++) {
95 /* Lines length pointer for this plane */
96 lp = encoded + p * (height << 1);
99 for(row = 0; row < height; row++) {
100 pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
101 pixptr_end = pixptr + c->pic.linesize[0];
102 dlen = be2me_16(*(unsigned short *)(lp+row*2));
103 /* Decode a row of this plane */
105 if(dp + 1 >= buf+buf_size) return -1;
106 if ((count = *dp++) <= 127) {
109 if (pixptr + count * px_inc > pixptr_end)
111 if(dp + count > buf+buf_size) return -1;
118 if (pixptr + count * px_inc > pixptr_end)
131 if (avctx->palctrl) {
132 memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
133 if (avctx->palctrl->palette_changed) {
134 c->pic.palette_has_changed = 1;
135 avctx->palctrl->palette_changed = 0;
137 c->pic.palette_has_changed = 0;
140 *data_size = sizeof(AVFrame);
141 *(AVFrame*)data = c->pic;
143 /* always report that the buffer was completely consumed */
153 static int decode_init(AVCodecContext *avctx)
155 EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
158 avctx->has_b_frames = 0;
160 c->pic.data[0] = NULL;
162 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
166 switch (avctx->bits_per_sample) {
168 avctx->pix_fmt = PIX_FMT_PAL8;
170 c->planemap[0] = 0; // 1st plane is palette indexes
171 if (avctx->palctrl == NULL) {
172 av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n");
177 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
179 c->planemap[0] = 2; // 1st plane is red
180 c->planemap[1] = 1; // 2nd plane is green
181 c->planemap[2] = 0; // 3rd plane is blue
184 avctx->pix_fmt = PIX_FMT_RGB32;
186 #ifdef WORDS_BIGENDIAN
187 c->planemap[0] = 1; // 1st plane is red
188 c->planemap[1] = 2; // 2nd plane is green
189 c->planemap[2] = 3; // 3rd plane is blue
190 c->planemap[3] = 0; // 4th plane is alpha???
192 c->planemap[0] = 2; // 1st plane is red
193 c->planemap[1] = 1; // 2nd plane is green
194 c->planemap[2] = 0; // 3rd plane is blue
195 c->planemap[3] = 3; // 4th plane is alpha???
199 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_sample);
211 * Uninit 8BPS decoder
214 static int decode_end(AVCodecContext *avctx)
216 EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
219 avctx->release_buffer(avctx, &c->pic);
226 AVCodec eightbps_decoder = {
230 sizeof(EightBpsContext),