3 * Copyright (c) 2011-2012 Paul B Mahol
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 * Commodore CDXL video decoder
25 * @author Paul B Mahol
28 #define UNCHECKED_BITSTREAM_READER 1
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/imgutils.h"
36 #define BIT_PLANAR 0x00
38 #define BYTE_PLANAR 0x40
40 #define BYTE_LINE 0xC0
43 AVCodecContext *avctx;
47 const uint8_t *palette;
55 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
57 CDXLVideoContext *c = avctx->priv_data;
59 c->new_video_size = 0;
65 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
69 for (i = 0; i < c->palette_size / 2; i++) {
70 unsigned rgb = AV_RB16(&c->palette[i * 2]);
71 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
72 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
73 unsigned b = (rgb & 0xF) * 0x11;
74 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
78 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
83 init_get_bits(&gb, c->video, c->video_size * 8);
84 for (plane = 0; plane < c->bpp; plane++) {
85 for (y = 0; y < c->avctx->height; y++) {
86 for (x = 0; x < c->avctx->width; x++)
87 out[linesize * y + x] |= get_bits1(&gb) << plane;
88 skip_bits(&gb, c->padded_bits);
93 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
98 init_get_bits(&gb, c->video, c->video_size * 8);
99 for (y = 0; y < c->avctx->height; y++) {
100 for (plane = 0; plane < c->bpp; plane++) {
101 for (x = 0; x < c->avctx->width; x++)
102 out[linesize * y + x] |= get_bits1(&gb) << plane;
103 skip_bits(&gb, c->padded_bits);
108 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
110 memset(out, 0, linesize * c->avctx->height);
114 bitplanar2chunky(c, linesize, out);
117 bitline2chunky(c, linesize, out);
122 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
124 uint32_t *new_palette = (uint32_t *)frame->data[1];
126 memset(frame->data[1], 0, AVPALETTE_SIZE);
127 import_palette(c, new_palette);
128 import_format(c, frame->linesize[0], frame->data[0]);
131 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
133 AVCodecContext *avctx = c->avctx;
134 uint32_t new_palette[16], r, g, b;
135 uint8_t *ptr, *out, index, op;
139 out = frame->data[0];
141 import_palette(c, new_palette);
142 import_format(c, avctx->width, c->new_video);
144 for (y = 0; y < avctx->height; y++) {
145 r = new_palette[0] & 0xFF0000;
146 g = new_palette[0] & 0xFF00;
147 b = new_palette[0] & 0xFF;
148 for (x = 0; x < avctx->width; x++) {
154 r = new_palette[index] & 0xFF0000;
155 g = new_palette[index] & 0xFF00;
156 b = new_palette[index] & 0xFF;
162 r = index * 0x11 << 16;
165 g = index * 0x11 << 8;
168 AV_WL24(out + x * 3, r | g | b);
170 out += frame->linesize[0];
174 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
176 AVCodecContext *avctx = c->avctx;
177 uint32_t new_palette[64], r, g, b;
178 uint8_t *ptr, *out, index, op;
182 out = frame->data[0];
184 import_palette(c, new_palette);
185 import_format(c, avctx->width, c->new_video);
187 for (y = 0; y < avctx->height; y++) {
188 r = new_palette[0] & 0xFF0000;
189 g = new_palette[0] & 0xFF00;
190 b = new_palette[0] & 0xFF;
191 for (x = 0; x < avctx->width; x++) {
197 r = new_palette[index] & 0xFF0000;
198 g = new_palette[index] & 0xFF00;
199 b = new_palette[index] & 0xFF;
202 b = (index << 2) | (b & 3);
205 r = (index << 18) | (r & (3 << 16));
208 g = (index << 10) | (g & (3 << 8));
211 AV_WL24(out + x * 3, r | g | b);
213 out += frame->linesize[0];
217 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
218 int *got_frame, AVPacket *pkt)
220 CDXLVideoContext *c = avctx->priv_data;
221 AVFrame * const p = data;
222 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
223 const uint8_t *buf = pkt->data;
226 return AVERROR_INVALIDDATA;
227 encoding = buf[1] & 7;
228 c->format = buf[1] & 0xE0;
229 w = AV_RB16(&buf[14]);
230 h = AV_RB16(&buf[16]);
232 c->palette_size = AV_RB16(&buf[20]);
233 c->palette = buf + 32;
234 c->video = c->palette + c->palette_size;
235 c->video_size = buf_size - c->palette_size - 32;
237 if (c->palette_size > 512)
238 return AVERROR_INVALIDDATA;
239 if (buf_size < c->palette_size + 32)
240 return AVERROR_INVALIDDATA;
242 return AVERROR_INVALIDDATA;
243 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
244 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
245 return AVERROR_PATCHWELCOME;
248 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
250 if (w != avctx->width || h != avctx->height)
251 avcodec_set_dimensions(avctx, w, h);
253 aligned_width = FFALIGN(c->avctx->width, 16);
254 c->padded_bits = aligned_width - c->avctx->width;
255 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
256 return AVERROR_INVALIDDATA;
257 if (!encoding && c->palette_size && c->bpp <= 8) {
258 avctx->pix_fmt = AV_PIX_FMT_PAL8;
259 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
260 if (c->palette_size != (1 << (c->bpp - 1)))
261 return AVERROR_INVALIDDATA;
262 avctx->pix_fmt = AV_PIX_FMT_BGR24;
264 avpriv_request_sample(avctx, "Encoding %d and bpp %d",
266 return AVERROR_PATCHWELCOME;
269 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
271 p->pict_type = AV_PICTURE_TYPE_I;
274 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
275 h * w + FF_INPUT_BUFFER_PADDING_SIZE);
277 return AVERROR(ENOMEM);
279 cdxl_decode_ham8(c, p);
281 cdxl_decode_ham6(c, p);
283 cdxl_decode_rgb(c, p);
290 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
292 CDXLVideoContext *c = avctx->priv_data;
294 av_freep(&c->new_video);
299 AVCodec ff_cdxl_decoder = {
301 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
302 .type = AVMEDIA_TYPE_VIDEO,
303 .id = AV_CODEC_ID_CDXL,
304 .priv_data_size = sizeof(CDXLVideoContext),
305 .init = cdxl_decode_init,
306 .close = cdxl_decode_end,
307 .decode = cdxl_decode_frame,
308 .capabilities = CODEC_CAP_DR1,