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"
33 #include "bytestream.h"
37 #define BIT_PLANAR 0x00
39 #define BYTE_PLANAR 0x40
41 #define BYTE_LINE 0xC0
43 typedef struct CDXLVideoContext {
44 AVCodecContext *avctx;
49 const uint8_t *palette;
57 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
59 CDXLVideoContext *c = avctx->priv_data;
61 c->new_video_size = 0;
67 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
70 for (int i = 0; i < c->palette_size / 2; i++) {
71 unsigned rgb = AV_RB16(&c->palette[i * 2]);
72 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
73 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
74 unsigned b = (rgb & 0xF) * 0x11;
75 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
78 for (int i = 0; i < c->palette_size / 3; i++) {
79 unsigned rgb = AV_RB24(&c->palette[i * 3]);
80 AV_WN32(&new_palette[i], (0xFFU << 24) | rgb);
85 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
90 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
92 for (plane = 0; plane < c->bpp; plane++) {
93 for (y = 0; y < c->avctx->height; y++) {
94 for (x = 0; x < c->avctx->width; x++)
95 out[linesize * y + x] |= get_bits1(&gb) << plane;
96 skip_bits(&gb, c->padded_bits);
101 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
106 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
108 for (y = 0; y < c->avctx->height; y++) {
109 for (plane = 0; plane < c->bpp; plane++) {
110 for (x = 0; x < c->avctx->width; x++)
111 out[linesize * y + x] |= get_bits1(&gb) << plane;
112 skip_bits(&gb, c->padded_bits);
117 static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
122 bytestream2_init(&gb, c->video, c->video_size);
123 for (y = 0; y < c->avctx->height; y++) {
124 bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
128 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
130 memset(out, 0, linesize * c->avctx->height);
134 bitplanar2chunky(c, linesize, out);
137 bitline2chunky(c, linesize, out);
140 chunky2chunky(c, linesize, out);
145 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
147 uint32_t *new_palette = (uint32_t *)frame->data[1];
149 memset(frame->data[1], 0, AVPALETTE_SIZE);
150 import_palette(c, new_palette);
151 import_format(c, frame->linesize[0], frame->data[0]);
154 static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
156 import_format(c, frame->linesize[0], frame->data[0]);
159 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
161 AVCodecContext *avctx = c->avctx;
162 uint32_t new_palette[16], r, g, b;
163 uint8_t *ptr, *out, index, op;
167 out = frame->data[0];
169 import_palette(c, new_palette);
170 import_format(c, avctx->width, c->new_video);
172 for (y = 0; y < avctx->height; y++) {
173 r = new_palette[0] & 0xFF0000;
174 g = new_palette[0] & 0xFF00;
175 b = new_palette[0] & 0xFF;
176 for (x = 0; x < avctx->width; x++) {
182 r = new_palette[index] & 0xFF0000;
183 g = new_palette[index] & 0xFF00;
184 b = new_palette[index] & 0xFF;
190 r = index * 0x11 << 16;
193 g = index * 0x11 << 8;
196 AV_WL24(out + x * 3, r | g | b);
198 out += frame->linesize[0];
202 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
204 AVCodecContext *avctx = c->avctx;
205 uint32_t new_palette[64], r, g, b;
206 uint8_t *ptr, *out, index, op;
210 out = frame->data[0];
212 import_palette(c, new_palette);
213 import_format(c, avctx->width, c->new_video);
215 for (y = 0; y < avctx->height; y++) {
216 r = new_palette[0] & 0xFF0000;
217 g = new_palette[0] & 0xFF00;
218 b = new_palette[0] & 0xFF;
219 for (x = 0; x < avctx->width; x++) {
225 r = new_palette[index] & 0xFF0000;
226 g = new_palette[index] & 0xFF00;
227 b = new_palette[index] & 0xFF;
230 b = (index << 2) | (b & 3);
233 r = (index << 18) | (r & (3 << 16));
236 g = (index << 10) | (g & (3 << 8));
239 AV_WL24(out + x * 3, r | g | b);
241 out += frame->linesize[0];
245 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
246 int *got_frame, AVPacket *pkt)
248 CDXLVideoContext *c = avctx->priv_data;
249 AVFrame * const p = data;
250 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
251 const uint8_t *buf = pkt->data;
254 return AVERROR_INVALIDDATA;
256 encoding = buf[1] & 7;
257 c->format = buf[1] & 0xE0;
258 w = AV_RB16(&buf[14]);
259 h = AV_RB16(&buf[16]);
261 c->palette_size = AV_RB16(&buf[20]);
262 c->palette = buf + 32;
263 c->video = c->palette + c->palette_size;
264 c->video_size = buf_size - c->palette_size - 32;
267 return AVERROR_INVALIDDATA;
268 if (c->type == 1 && c->palette_size > 512)
269 return AVERROR_INVALIDDATA;
270 if (c->type == 0 && c->palette_size > 768)
271 return AVERROR_INVALIDDATA;
272 if (buf_size < c->palette_size + 32)
273 return AVERROR_INVALIDDATA;
275 return AVERROR_INVALIDDATA;
276 if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
277 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
278 return AVERROR_PATCHWELCOME;
281 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
284 if (c->format == CHUNKY)
285 aligned_width = avctx->width;
287 aligned_width = FFALIGN(c->avctx->width, 16);
288 c->padded_bits = aligned_width - c->avctx->width;
289 if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
290 return AVERROR_INVALIDDATA;
291 if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
292 avctx->pix_fmt = AV_PIX_FMT_PAL8;
293 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
294 if (c->palette_size != (1 << (c->bpp - 1)))
295 return AVERROR_INVALIDDATA;
296 avctx->pix_fmt = AV_PIX_FMT_BGR24;
297 } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
299 avctx->pix_fmt = AV_PIX_FMT_RGB24;
301 avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
302 encoding, c->bpp, c->format);
303 return AVERROR_PATCHWELCOME;
306 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
308 p->pict_type = AV_PICTURE_TYPE_I;
312 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
313 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
315 return AVERROR(ENOMEM);
317 cdxl_decode_ham8(c, p);
319 cdxl_decode_ham6(c, p);
320 } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
321 cdxl_decode_rgb(c, p);
323 cdxl_decode_raw(c, p);
330 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
332 CDXLVideoContext *c = avctx->priv_data;
334 av_freep(&c->new_video);
339 AVCodec ff_cdxl_decoder = {
341 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
342 .type = AVMEDIA_TYPE_VIDEO,
343 .id = AV_CODEC_ID_CDXL,
344 .priv_data_size = sizeof(CDXLVideoContext),
345 .init = cdxl_decode_init,
346 .close = cdxl_decode_end,
347 .decode = cdxl_decode_frame,
348 .capabilities = AV_CODEC_CAP_DR1,
349 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,