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
22 #define UNCHECKED_BITSTREAM_READER 1
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/imgutils.h"
30 #define BIT_PLANAR 0x00
32 #define BYTE_PLANAR 0x40
34 #define BYTE_LINE 0xC0
37 AVCodecContext *avctx;
41 const uint8_t *palette;
49 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
51 CDXLVideoContext *c = avctx->priv_data;
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], (0xFFU << 24) | (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, AVFrame *frame)
118 uint32_t *new_palette = (uint32_t *)frame->data[1];
120 memset(frame->data[1], 0, AVPALETTE_SIZE);
121 import_palette(c, new_palette);
122 import_format(c, frame->linesize[0], frame->data[0]);
125 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
127 AVCodecContext *avctx = c->avctx;
128 uint32_t new_palette[16], r, g, b;
129 uint8_t *ptr, *out, index, op;
133 out = frame->data[0];
135 import_palette(c, new_palette);
136 import_format(c, avctx->width, c->new_video);
138 for (y = 0; y < avctx->height; y++) {
139 r = new_palette[0] & 0xFF0000;
140 g = new_palette[0] & 0xFF00;
141 b = new_palette[0] & 0xFF;
142 for (x = 0; x < avctx->width; x++) {
148 r = new_palette[index] & 0xFF0000;
149 g = new_palette[index] & 0xFF00;
150 b = new_palette[index] & 0xFF;
156 r = index * 0x11 << 16;
159 g = index * 0x11 << 8;
162 AV_WL24(out + x * 3, r | g | b);
164 out += frame->linesize[0];
168 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
170 AVCodecContext *avctx = c->avctx;
171 uint32_t new_palette[64], r, g, b;
172 uint8_t *ptr, *out, index, op;
176 out = frame->data[0];
178 import_palette(c, new_palette);
179 import_format(c, avctx->width, c->new_video);
181 for (y = 0; y < avctx->height; y++) {
182 r = new_palette[0] & 0xFF0000;
183 g = new_palette[0] & 0xFF00;
184 b = new_palette[0] & 0xFF;
185 for (x = 0; x < avctx->width; x++) {
191 r = new_palette[index] & 0xFF0000;
192 g = new_palette[index] & 0xFF00;
193 b = new_palette[index] & 0xFF;
196 b = (index << 2) | (b & 3);
199 r = (index << 18) | (r & (3 << 16));
202 g = (index << 10) | (g & (3 << 8));
205 AV_WL24(out + x * 3, r | g | b);
207 out += frame->linesize[0];
211 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
212 int *got_frame, AVPacket *pkt)
214 CDXLVideoContext *c = avctx->priv_data;
215 AVFrame * const p = data;
216 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
217 const uint8_t *buf = pkt->data;
220 return AVERROR_INVALIDDATA;
221 encoding = buf[1] & 7;
222 c->format = buf[1] & 0xE0;
223 w = AV_RB16(&buf[14]);
224 h = AV_RB16(&buf[16]);
226 c->palette_size = AV_RB16(&buf[20]);
227 c->palette = buf + 32;
228 c->video = c->palette + c->palette_size;
229 c->video_size = buf_size - c->palette_size - 32;
231 if (c->palette_size > 512)
232 return AVERROR_INVALIDDATA;
233 if (buf_size < c->palette_size + 32)
234 return AVERROR_INVALIDDATA;
236 return AVERROR_INVALIDDATA;
237 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
238 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
239 return AVERROR_PATCHWELCOME;
242 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
244 if (w != avctx->width || h != avctx->height)
245 avcodec_set_dimensions(avctx, w, h);
247 aligned_width = FFALIGN(c->avctx->width, 16);
248 c->padded_bits = aligned_width - c->avctx->width;
249 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
250 return AVERROR_INVALIDDATA;
251 if (!encoding && c->palette_size && c->bpp <= 8) {
252 avctx->pix_fmt = AV_PIX_FMT_PAL8;
253 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
254 if (c->palette_size != (1 << (c->bpp - 1)))
255 return AVERROR_INVALIDDATA;
256 avctx->pix_fmt = AV_PIX_FMT_BGR24;
258 avpriv_request_sample(avctx, "Encoding %d and bpp %d",
260 return AVERROR_PATCHWELCOME;
263 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
265 p->pict_type = AV_PICTURE_TYPE_I;
268 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
269 h * w + FF_INPUT_BUFFER_PADDING_SIZE);
271 return AVERROR(ENOMEM);
273 cdxl_decode_ham8(c, p);
275 cdxl_decode_ham6(c, p);
277 cdxl_decode_rgb(c, p);
284 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
286 CDXLVideoContext *c = avctx->priv_data;
288 av_free(c->new_video);
293 AVCodec ff_cdxl_decoder = {
295 .type = AVMEDIA_TYPE_VIDEO,
296 .id = AV_CODEC_ID_CDXL,
297 .priv_data_size = sizeof(CDXLVideoContext),
298 .init = cdxl_decode_init,
299 .close = cdxl_decode_end,
300 .decode = cdxl_decode_frame,
301 .capabilities = CODEC_CAP_DR1,
302 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),