3 * Copyright (c) 2011-2012 Paul B Mahol
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
28 #define BIT_PLANAR 0x00
29 #define BYTE_PLANAR 0x20
32 #define BYTE_LINE 0xC0
35 AVCodecContext *avctx;
39 const uint8_t *palette;
47 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
49 CDXLVideoContext *c = avctx->priv_data;
51 c->new_video_size = 0;
57 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
61 for (i = 0; i < c->palette_size / 2; i++) {
62 unsigned rgb = AV_RB16(&c->palette[i * 2]);
63 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
64 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
65 unsigned b = (rgb & 0xF) * 0x11;
66 AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
70 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
75 init_get_bits(&gb, c->video, c->video_size * 8);
76 for (plane = 0; plane < c->bpp; plane++) {
77 for (y = 0; y < c->avctx->height; y++) {
78 for (x = 0; x < c->avctx->width; x++)
79 out[linesize * y + x] |= get_bits1(&gb) << plane;
80 skip_bits(&gb, c->padded_bits);
85 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
90 init_get_bits(&gb, c->video, c->video_size * 8);
91 for (y = 0; y < c->avctx->height; y++) {
92 for (plane = 0; plane < c->bpp; plane++) {
93 for (x = 0; x < c->avctx->width; x++)
94 out[linesize * y + x] |= get_bits1(&gb) << plane;
95 skip_bits(&gb, c->padded_bits);
100 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
102 memset(out, 0, linesize * c->avctx->height);
106 bitplanar2chunky(c, linesize, out);
109 bitline2chunky(c, linesize, out);
114 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
116 uint32_t *new_palette = (uint32_t *)frame->data[1];
118 import_palette(c, new_palette);
119 import_format(c, frame->linesize[0], frame->data[0]);
122 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
124 AVCodecContext *avctx = c->avctx;
125 uint32_t new_palette[16], r, g, b;
126 uint8_t *ptr, *out, index, op;
130 out = frame->data[0];
132 import_palette(c, new_palette);
133 import_format(c, avctx->width, c->new_video);
135 for (y = 0; y < avctx->height; y++) {
136 r = new_palette[0] & 0xFF0000;
137 g = new_palette[0] & 0xFF00;
138 b = new_palette[0] & 0xFF;
139 for (x = 0; x < avctx->width; x++) {
145 r = new_palette[index] & 0xFF0000;
146 g = new_palette[index] & 0xFF00;
147 b = new_palette[index] & 0xFF;
153 r = index * 0x11 << 16;
156 g = index * 0x11 << 8;
159 AV_WL24(out + x * 3, r | g | b);
161 out += frame->linesize[0];
165 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
167 AVCodecContext *avctx = c->avctx;
168 uint32_t new_palette[64], r, g, b;
169 uint8_t *ptr, *out, index, op;
173 out = frame->data[0];
175 import_palette(c, new_palette);
176 import_format(c, avctx->width, c->new_video);
178 for (y = 0; y < avctx->height; y++) {
179 r = new_palette[0] & 0xFF0000;
180 g = new_palette[0] & 0xFF00;
181 b = new_palette[0] & 0xFF;
182 for (x = 0; x < avctx->width; x++) {
188 r = new_palette[index] & 0xFF0000;
189 g = new_palette[index] & 0xFF00;
190 b = new_palette[index] & 0xFF;
193 b = (index << 2) | (b & 3);
196 r = (index << 18) | (r & (3 << 16));
199 g = (index << 10) | (g & (3 << 8));
202 AV_WL24(out + x * 3, r | g | b);
204 out += frame->linesize[0];
208 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
209 int *got_frame, AVPacket *pkt)
211 CDXLVideoContext *c = avctx->priv_data;
212 AVFrame * const p = data;
213 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
214 const uint8_t *buf = pkt->data;
217 return AVERROR_INVALIDDATA;
218 encoding = buf[1] & 7;
219 c->format = buf[1] & 0xE0;
220 w = AV_RB16(&buf[14]);
221 h = AV_RB16(&buf[16]);
223 c->palette_size = AV_RB16(&buf[20]);
224 c->palette = buf + 32;
225 c->video = c->palette + c->palette_size;
226 c->video_size = buf_size - c->palette_size - 32;
228 if (c->palette_size > 512)
229 return AVERROR_INVALIDDATA;
230 if (buf_size < c->palette_size + 32)
231 return AVERROR_INVALIDDATA;
233 return AVERROR_INVALIDDATA;
234 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
235 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
236 return AVERROR_PATCHWELCOME;
239 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
242 aligned_width = FFALIGN(c->avctx->width, 16);
243 c->padded_bits = aligned_width - c->avctx->width;
244 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
245 return AVERROR_INVALIDDATA;
246 if (!encoding && c->palette_size && c->bpp <= 8) {
247 avctx->pix_fmt = AV_PIX_FMT_PAL8;
248 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
249 if (c->palette_size != (1 << (c->bpp - 1)))
250 return AVERROR_INVALIDDATA;
251 avctx->pix_fmt = AV_PIX_FMT_BGR24;
253 avpriv_request_sample(avctx, "Encoding %d and bpp %d",
255 return AVERROR_PATCHWELCOME;
258 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
259 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
262 p->pict_type = AV_PICTURE_TYPE_I;
265 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
266 h * w + FF_INPUT_BUFFER_PADDING_SIZE);
268 return AVERROR(ENOMEM);
270 cdxl_decode_ham8(c, p);
272 cdxl_decode_ham6(c, p);
274 cdxl_decode_rgb(c, p);
281 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
283 CDXLVideoContext *c = avctx->priv_data;
285 av_free(c->new_video);
290 AVCodec ff_cdxl_decoder = {
292 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
293 .type = AVMEDIA_TYPE_VIDEO,
294 .id = AV_CODEC_ID_CDXL,
295 .priv_data_size = sizeof(CDXLVideoContext),
296 .init = cdxl_decode_init,
297 .close = cdxl_decode_end,
298 .decode = cdxl_decode_frame,
299 .capabilities = CODEC_CAP_DR1,