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;
42 const uint8_t *palette;
50 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
52 CDXLVideoContext *c = avctx->priv_data;
54 avcodec_get_frame_defaults(&c->frame);
55 c->new_video_size = 0;
61 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
65 for (i = 0; i < c->palette_size / 2; i++) {
66 unsigned rgb = AV_RB16(&c->palette[i * 2]);
67 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
68 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
69 unsigned b = (rgb & 0xF) * 0x11;
70 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
74 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
79 init_get_bits(&gb, c->video, c->video_size * 8);
80 for (plane = 0; plane < c->bpp; plane++) {
81 for (y = 0; y < c->avctx->height; y++) {
82 for (x = 0; x < c->avctx->width; x++)
83 out[linesize * y + x] |= get_bits1(&gb) << plane;
84 skip_bits(&gb, c->padded_bits);
89 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
94 init_get_bits(&gb, c->video, c->video_size * 8);
95 for (y = 0; y < c->avctx->height; y++) {
96 for (plane = 0; plane < c->bpp; plane++) {
97 for (x = 0; x < c->avctx->width; x++)
98 out[linesize * y + x] |= get_bits1(&gb) << plane;
99 skip_bits(&gb, c->padded_bits);
104 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
106 memset(out, 0, linesize * c->avctx->height);
110 bitplanar2chunky(c, linesize, out);
113 bitline2chunky(c, linesize, out);
118 static void cdxl_decode_rgb(CDXLVideoContext *c)
120 uint32_t *new_palette = (uint32_t *)c->frame.data[1];
122 import_palette(c, new_palette);
123 import_format(c, c->frame.linesize[0], c->frame.data[0]);
126 static void cdxl_decode_ham6(CDXLVideoContext *c)
128 AVCodecContext *avctx = c->avctx;
129 uint32_t new_palette[16], r, g, b;
130 uint8_t *ptr, *out, index, op;
134 out = c->frame.data[0];
136 import_palette(c, new_palette);
137 import_format(c, avctx->width, c->new_video);
139 for (y = 0; y < avctx->height; y++) {
140 r = new_palette[0] & 0xFF0000;
141 g = new_palette[0] & 0xFF00;
142 b = new_palette[0] & 0xFF;
143 for (x = 0; x < avctx->width; x++) {
149 r = new_palette[index] & 0xFF0000;
150 g = new_palette[index] & 0xFF00;
151 b = new_palette[index] & 0xFF;
157 r = index * 0x11 << 16;
160 g = index * 0x11 << 8;
163 AV_WL24(out + x * 3, r | g | b);
165 out += c->frame.linesize[0];
169 static void cdxl_decode_ham8(CDXLVideoContext *c)
171 AVCodecContext *avctx = c->avctx;
172 uint32_t new_palette[64], r, g, b;
173 uint8_t *ptr, *out, index, op;
177 out = c->frame.data[0];
179 import_palette(c, new_palette);
180 import_format(c, avctx->width, c->new_video);
182 for (y = 0; y < avctx->height; y++) {
183 r = new_palette[0] & 0xFF0000;
184 g = new_palette[0] & 0xFF00;
185 b = new_palette[0] & 0xFF;
186 for (x = 0; x < avctx->width; x++) {
192 r = new_palette[index] & 0xFF0000;
193 g = new_palette[index] & 0xFF00;
194 b = new_palette[index] & 0xFF;
197 b = (index << 2) | (b & 3);
200 r = (index << 18) | (r & (3 << 16));
203 g = (index << 10) | (g & (3 << 8));
206 AV_WL24(out + x * 3, r | g | b);
208 out += c->frame.linesize[0];
212 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
213 int *got_frame, AVPacket *pkt)
215 CDXLVideoContext *c = avctx->priv_data;
216 AVFrame * const p = &c->frame;
217 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
218 const uint8_t *buf = pkt->data;
221 return AVERROR_INVALIDDATA;
222 encoding = buf[1] & 7;
223 c->format = buf[1] & 0xE0;
224 w = AV_RB16(&buf[14]);
225 h = AV_RB16(&buf[16]);
227 c->palette_size = AV_RB16(&buf[20]);
228 c->palette = buf + 32;
229 c->video = c->palette + c->palette_size;
230 c->video_size = buf_size - c->palette_size - 32;
232 if (c->palette_size > 512)
233 return AVERROR_INVALIDDATA;
234 if (buf_size < c->palette_size + 32)
235 return AVERROR_INVALIDDATA;
237 return AVERROR_INVALIDDATA;
238 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
239 av_log_ask_for_sample(avctx, "unsupported pixel format: 0x%0x\n", c->format);
240 return AVERROR_PATCHWELCOME;
243 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
245 if (w != avctx->width || h != avctx->height)
246 avcodec_set_dimensions(avctx, w, h);
248 aligned_width = FFALIGN(c->avctx->width, 16);
249 c->padded_bits = aligned_width - c->avctx->width;
250 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
251 return AVERROR_INVALIDDATA;
252 if (!encoding && c->palette_size && c->bpp <= 8) {
253 avctx->pix_fmt = AV_PIX_FMT_PAL8;
254 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
255 if (c->palette_size != (1 << (c->bpp - 1)))
256 return AVERROR_INVALIDDATA;
257 avctx->pix_fmt = AV_PIX_FMT_BGR24;
259 av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n",
261 return AVERROR_PATCHWELCOME;
265 avctx->release_buffer(avctx, p);
268 if ((ret = ff_get_buffer(avctx, p)) < 0) {
269 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
272 p->pict_type = AV_PICTURE_TYPE_I;
275 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
276 h * w + FF_INPUT_BUFFER_PADDING_SIZE);
278 return AVERROR(ENOMEM);
287 *(AVFrame*)data = c->frame;
292 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
294 CDXLVideoContext *c = avctx->priv_data;
296 av_free(c->new_video);
297 if (c->frame.data[0])
298 avctx->release_buffer(avctx, &c->frame);
303 AVCodec ff_cdxl_decoder = {
305 .type = AVMEDIA_TYPE_VIDEO,
306 .id = AV_CODEC_ID_CDXL,
307 .priv_data_size = sizeof(CDXLVideoContext),
308 .init = cdxl_decode_init,
309 .close = cdxl_decode_end,
310 .decode = cdxl_decode_frame,
311 .capabilities = CODEC_CAP_DR1,
312 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),