2 * Quicktime Planar RGB (8BPS) Video Decoder
3 * Copyright (C) 2003 Roberto Togni
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * QT 8BPS Video Decoder by Roberto Togni <rtogni at bresciaonline dot it>
24 * For more information about the 8BPS format, visit:
25 * http://www.pcisys.net/~melanson/codecs/
27 * Supports: PAL8 (RGB 8bpp, paletted)
28 * : BGR24 (RGB 24bpp) (can also output it as RGBA32)
29 * : RGBA32 (RGB 32bpp, 4th plane is probably alpha and it's ignored)
40 const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGBA32, -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 = (EightBpsContext *)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 /* no supplementary picture */
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_RGBA32);
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 = be2me_16(*(unsigned short *)(lp+row*2));
106 /* Decode a row of this plane */
108 if ((count = *dp++) <= 127) {
111 if (pixptr + count * px_inc > pixptr_end)
119 if (pixptr + count * px_inc > pixptr_end)
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;
138 c->pic.palette_has_changed = 0;
141 *data_size = sizeof(AVFrame);
142 *(AVFrame*)data = c->pic;
144 /* always report that the buffer was completely consumed */
154 static int decode_init(AVCodecContext *avctx)
156 EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
159 avctx->has_b_frames = 0;
161 c->pic.data[0] = NULL;
163 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
164 av_log(avctx, AV_LOG_ERROR, "Bad image size (w = %d, h = %d).\n", avctx->width, avctx->height);
168 switch (avctx->bits_per_sample) {
170 avctx->pix_fmt = PIX_FMT_PAL8;
172 c->planemap[0] = 0; // 1st plane is palette indexes
173 if (avctx->palctrl == NULL) {
174 av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n");
179 avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
181 c->planemap[0] = 2; // 1st plane is red
182 c->planemap[1] = 1; // 2nd plane is green
183 c->planemap[2] = 0; // 3rd plane is blue
186 avctx->pix_fmt = PIX_FMT_RGBA32;
188 #ifdef WORDS_BIGENDIAN
189 c->planemap[0] = 1; // 1st plane is red
190 c->planemap[1] = 2; // 2nd plane is green
191 c->planemap[2] = 3; // 3rd plane is blue
192 c->planemap[3] = 0; // 4th plane is alpha???
194 c->planemap[0] = 2; // 1st plane is red
195 c->planemap[1] = 1; // 2nd plane is green
196 c->planemap[2] = 0; // 3rd plane is blue
197 c->planemap[3] = 3; // 4th plane is alpha???
201 av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_sample);
213 * Uninit 8BPS decoder
216 static int decode_end(AVCodecContext *avctx)
218 EightBpsContext * const c = (EightBpsContext *)avctx->priv_data;
221 avctx->release_buffer(avctx, &c->pic);
228 AVCodec eightbps_decoder = {
232 sizeof(EightBpsContext),