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;
40 const uint8_t *palette;
48 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
50 CDXLVideoContext *c = avctx->priv_data;
52 avcodec_get_frame_defaults(&c->frame);
53 c->new_video_size = 0;
59 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
63 for (i = 0; i < c->palette_size / 2; i++) {
64 unsigned rgb = AV_RB16(&c->palette[i * 2]);
65 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
66 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
67 unsigned b = (rgb & 0xF) * 0x11;
68 AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
72 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
77 init_get_bits(&gb, c->video, c->video_size * 8);
78 for (plane = 0; plane < c->bpp; plane++) {
79 for (y = 0; y < c->avctx->height; y++) {
80 for (x = 0; x < c->avctx->width; x++)
81 out[linesize * y + x] |= get_bits1(&gb) << plane;
82 skip_bits(&gb, c->padded_bits);
87 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
92 init_get_bits(&gb, c->video, c->video_size * 8);
93 for (y = 0; y < c->avctx->height; y++) {
94 for (plane = 0; plane < c->bpp; plane++) {
95 for (x = 0; x < c->avctx->width; x++)
96 out[linesize * y + x] |= get_bits1(&gb) << plane;
97 skip_bits(&gb, c->padded_bits);
102 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
104 memset(out, 0, linesize * c->avctx->height);
108 bitplanar2chunky(c, linesize, out);
111 bitline2chunky(c, linesize, out);
116 static void cdxl_decode_rgb(CDXLVideoContext *c)
118 uint32_t *new_palette = (uint32_t *)c->frame.data[1];
120 import_palette(c, new_palette);
121 import_format(c, c->frame.linesize[0], c->frame.data[0]);
124 static void cdxl_decode_ham6(CDXLVideoContext *c)
126 AVCodecContext *avctx = c->avctx;
127 uint32_t new_palette[16], r, g, b;
128 uint8_t *ptr, *out, index, op;
132 out = c->frame.data[0];
134 import_palette(c, new_palette);
135 import_format(c, avctx->width, c->new_video);
137 for (y = 0; y < avctx->height; y++) {
138 r = new_palette[0] & 0xFF0000;
139 g = new_palette[0] & 0xFF00;
140 b = new_palette[0] & 0xFF;
141 for (x = 0; x < avctx->width; x++) {
147 r = new_palette[index] & 0xFF0000;
148 g = new_palette[index] & 0xFF00;
149 b = new_palette[index] & 0xFF;
155 r = index * 0x11 << 16;
158 g = index * 0x11 << 8;
161 AV_WL24(out + x * 3, r | g | b);
163 out += c->frame.linesize[0];
167 static void cdxl_decode_ham8(CDXLVideoContext *c)
169 AVCodecContext *avctx = c->avctx;
170 uint32_t new_palette[64], r, g, b;
171 uint8_t *ptr, *out, index, op;
175 out = c->frame.data[0];
177 import_palette(c, new_palette);
178 import_format(c, avctx->width, c->new_video);
180 for (y = 0; y < avctx->height; y++) {
181 r = new_palette[0] & 0xFF0000;
182 g = new_palette[0] & 0xFF00;
183 b = new_palette[0] & 0xFF;
184 for (x = 0; x < avctx->width; x++) {
190 r = new_palette[index] & 0xFF0000;
191 g = new_palette[index] & 0xFF00;
192 b = new_palette[index] & 0xFF;
195 b = (index << 2) | (b & 3);
198 r = (index << 18) | (r & (3 << 16));
201 g = (index << 10) | (g & (3 << 8));
204 AV_WL24(out + x * 3, r | g | b);
206 out += c->frame.linesize[0];
210 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
211 int *got_frame, AVPacket *pkt)
213 CDXLVideoContext *c = avctx->priv_data;
214 AVFrame * const p = &c->frame;
215 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
216 const uint8_t *buf = pkt->data;
219 return AVERROR_INVALIDDATA;
220 encoding = buf[1] & 7;
221 c->format = buf[1] & 0xE0;
222 w = AV_RB16(&buf[14]);
223 h = AV_RB16(&buf[16]);
225 c->palette_size = AV_RB16(&buf[20]);
226 c->palette = buf + 32;
227 c->video = c->palette + c->palette_size;
228 c->video_size = buf_size - c->palette_size - 32;
230 if (c->palette_size > 512)
231 return AVERROR_INVALIDDATA;
232 if (buf_size < c->palette_size + 32)
233 return AVERROR_INVALIDDATA;
235 return AVERROR_INVALIDDATA;
236 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
237 av_log_ask_for_sample(avctx, "unsupported pixel format: 0x%0x\n", c->format);
238 return AVERROR_PATCHWELCOME;
241 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
243 if (w != avctx->width || h != avctx->height)
244 avcodec_set_dimensions(avctx, w, h);
246 aligned_width = FFALIGN(c->avctx->width, 16);
247 c->padded_bits = aligned_width - c->avctx->width;
248 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
249 return AVERROR_INVALIDDATA;
250 if (!encoding && c->palette_size && c->bpp <= 8) {
251 avctx->pix_fmt = AV_PIX_FMT_PAL8;
252 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
253 if (c->palette_size != (1 << (c->bpp - 1)))
254 return AVERROR_INVALIDDATA;
255 avctx->pix_fmt = AV_PIX_FMT_BGR24;
257 av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n",
259 return AVERROR_PATCHWELCOME;
263 avctx->release_buffer(avctx, p);
266 if ((ret = ff_get_buffer(avctx, p)) < 0) {
267 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
270 p->pict_type = AV_PICTURE_TYPE_I;
273 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
274 h * w + FF_INPUT_BUFFER_PADDING_SIZE);
276 return AVERROR(ENOMEM);
285 *(AVFrame*)data = c->frame;
290 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
292 CDXLVideoContext *c = avctx->priv_data;
294 av_free(c->new_video);
295 if (c->frame.data[0])
296 avctx->release_buffer(avctx, &c->frame);
301 AVCodec ff_cdxl_decoder = {
303 .type = AVMEDIA_TYPE_VIDEO,
304 .id = AV_CODEC_ID_CDXL,
305 .priv_data_size = sizeof(CDXLVideoContext),
306 .init = cdxl_decode_init,
307 .close = cdxl_decode_end,
308 .decode = cdxl_decode_frame,
309 .capabilities = CODEC_CAP_DR1,
310 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),