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"
26 #include "bitstream.h"
29 #define BIT_PLANAR 0x00
30 #define BYTE_PLANAR 0x20
33 #define BYTE_LINE 0xC0
35 typedef struct CDXLVideoContext {
36 AVCodecContext *avctx;
40 const uint8_t *palette;
48 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
50 CDXLVideoContext *c = avctx->priv_data;
52 c->new_video_size = 0;
58 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
62 for (i = 0; i < c->palette_size / 2; i++) {
63 unsigned rgb = AV_RB16(&c->palette[i * 2]);
64 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
65 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
66 unsigned b = (rgb & 0xF) * 0x11;
67 AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
71 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
76 bitstream_init8(&bc, c->video, c->video_size);
77 for (plane = 0; plane < c->bpp; plane++) {
78 for (y = 0; y < c->avctx->height; y++) {
79 for (x = 0; x < c->avctx->width; x++)
80 out[linesize * y + x] |= bitstream_read_bit(&bc) << plane;
81 bitstream_skip(&bc, c->padded_bits);
86 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
91 bitstream_init8(&bc, c->video, c->video_size);
92 for (y = 0; y < c->avctx->height; y++) {
93 for (plane = 0; plane < c->bpp; plane++) {
94 for (x = 0; x < c->avctx->width; x++)
95 out[linesize * y + x] |= bitstream_read_bit(&bc) << plane;
96 bitstream_skip(&bc, c->padded_bits);
101 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
103 memset(out, 0, linesize * c->avctx->height);
107 bitplanar2chunky(c, linesize, out);
110 bitline2chunky(c, linesize, out);
115 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
117 uint32_t *new_palette = (uint32_t *)frame->data[1];
119 import_palette(c, new_palette);
120 import_format(c, frame->linesize[0], frame->data[0]);
123 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
125 AVCodecContext *avctx = c->avctx;
126 uint32_t new_palette[16], r, g, b;
127 uint8_t *ptr, *out, index, op;
131 out = frame->data[0];
133 import_palette(c, new_palette);
134 import_format(c, avctx->width, c->new_video);
136 for (y = 0; y < avctx->height; y++) {
137 r = new_palette[0] & 0xFF0000;
138 g = new_palette[0] & 0xFF00;
139 b = new_palette[0] & 0xFF;
140 for (x = 0; x < avctx->width; x++) {
146 r = new_palette[index] & 0xFF0000;
147 g = new_palette[index] & 0xFF00;
148 b = new_palette[index] & 0xFF;
154 r = index * 0x11 << 16;
157 g = index * 0x11 << 8;
160 AV_WL24(out + x * 3, r | g | b);
162 out += frame->linesize[0];
166 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
168 AVCodecContext *avctx = c->avctx;
169 uint32_t new_palette[64], r, g, b;
170 uint8_t *ptr, *out, index, op;
174 out = frame->data[0];
176 import_palette(c, new_palette);
177 import_format(c, avctx->width, c->new_video);
179 for (y = 0; y < avctx->height; y++) {
180 r = new_palette[0] & 0xFF0000;
181 g = new_palette[0] & 0xFF00;
182 b = new_palette[0] & 0xFF;
183 for (x = 0; x < avctx->width; x++) {
189 r = new_palette[index] & 0xFF0000;
190 g = new_palette[index] & 0xFF00;
191 b = new_palette[index] & 0xFF;
194 b = (index << 2) | (b & 3);
197 r = (index << 18) | (r & (3 << 16));
200 g = (index << 10) | (g & (3 << 8));
203 AV_WL24(out + x * 3, r | g | b);
205 out += frame->linesize[0];
209 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
210 int *got_frame, AVPacket *pkt)
212 CDXLVideoContext *c = avctx->priv_data;
213 AVFrame * const p = data;
214 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
215 const uint8_t *buf = pkt->data;
218 return AVERROR_INVALIDDATA;
219 encoding = buf[1] & 7;
220 c->format = buf[1] & 0xE0;
221 w = AV_RB16(&buf[14]);
222 h = AV_RB16(&buf[16]);
224 c->palette_size = AV_RB16(&buf[20]);
225 c->palette = buf + 32;
226 c->video = c->palette + c->palette_size;
227 c->video_size = buf_size - c->palette_size - 32;
229 if (c->palette_size > 512)
230 return AVERROR_INVALIDDATA;
231 if (buf_size < c->palette_size + 32)
232 return AVERROR_INVALIDDATA;
234 return AVERROR_INVALIDDATA;
235 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
236 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
237 return AVERROR_PATCHWELCOME;
240 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
243 aligned_width = FFALIGN(c->avctx->width, 16);
244 c->padded_bits = aligned_width - c->avctx->width;
245 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
246 return AVERROR_INVALIDDATA;
247 if (!encoding && c->palette_size && c->bpp <= 8) {
248 avctx->pix_fmt = AV_PIX_FMT_PAL8;
249 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
250 if (c->palette_size != (1 << (c->bpp - 1)))
251 return AVERROR_INVALIDDATA;
252 avctx->pix_fmt = AV_PIX_FMT_BGR24;
254 avpriv_request_sample(avctx, "Encoding %d and bpp %d",
256 return AVERROR_PATCHWELCOME;
259 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
260 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
263 p->pict_type = AV_PICTURE_TYPE_I;
266 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
267 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
269 return AVERROR(ENOMEM);
271 cdxl_decode_ham8(c, p);
273 cdxl_decode_ham6(c, p);
275 cdxl_decode_rgb(c, p);
282 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
284 CDXLVideoContext *c = avctx->priv_data;
286 av_free(c->new_video);
291 AVCodec ff_cdxl_decoder = {
293 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
294 .type = AVMEDIA_TYPE_VIDEO,
295 .id = AV_CODEC_ID_CDXL,
296 .priv_data_size = sizeof(CDXLVideoContext),
297 .init = cdxl_decode_init,
298 .close = cdxl_decode_end,
299 .decode = cdxl_decode_frame,
300 .capabilities = AV_CODEC_CAP_DR1,