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;
48 const uint8_t *palette;
56 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
58 CDXLVideoContext *c = avctx->priv_data;
60 c->new_video_size = 0;
66 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
70 for (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);
79 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
84 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
86 for (plane = 0; plane < c->bpp; plane++) {
87 for (y = 0; y < c->avctx->height; y++) {
88 for (x = 0; x < c->avctx->width; x++)
89 out[linesize * y + x] |= get_bits1(&gb) << plane;
90 skip_bits(&gb, c->padded_bits);
95 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
100 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
102 for (y = 0; y < c->avctx->height; y++) {
103 for (plane = 0; plane < c->bpp; plane++) {
104 for (x = 0; x < c->avctx->width; x++)
105 out[linesize * y + x] |= get_bits1(&gb) << plane;
106 skip_bits(&gb, c->padded_bits);
111 static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
116 bytestream2_init(&gb, c->video, c->video_size);
117 for (y = 0; y < c->avctx->height; y++) {
118 bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
122 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
124 memset(out, 0, linesize * c->avctx->height);
128 bitplanar2chunky(c, linesize, out);
131 bitline2chunky(c, linesize, out);
134 chunky2chunky(c, linesize, out);
139 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
141 uint32_t *new_palette = (uint32_t *)frame->data[1];
143 memset(frame->data[1], 0, AVPALETTE_SIZE);
144 import_palette(c, new_palette);
145 import_format(c, frame->linesize[0], frame->data[0]);
148 static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
150 import_format(c, frame->linesize[0], frame->data[0]);
153 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
155 AVCodecContext *avctx = c->avctx;
156 uint32_t new_palette[16], r, g, b;
157 uint8_t *ptr, *out, index, op;
161 out = frame->data[0];
163 import_palette(c, new_palette);
164 import_format(c, avctx->width, c->new_video);
166 for (y = 0; y < avctx->height; y++) {
167 r = new_palette[0] & 0xFF0000;
168 g = new_palette[0] & 0xFF00;
169 b = new_palette[0] & 0xFF;
170 for (x = 0; x < avctx->width; x++) {
176 r = new_palette[index] & 0xFF0000;
177 g = new_palette[index] & 0xFF00;
178 b = new_palette[index] & 0xFF;
184 r = index * 0x11 << 16;
187 g = index * 0x11 << 8;
190 AV_WL24(out + x * 3, r | g | b);
192 out += frame->linesize[0];
196 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
198 AVCodecContext *avctx = c->avctx;
199 uint32_t new_palette[64], r, g, b;
200 uint8_t *ptr, *out, index, op;
204 out = frame->data[0];
206 import_palette(c, new_palette);
207 import_format(c, avctx->width, c->new_video);
209 for (y = 0; y < avctx->height; y++) {
210 r = new_palette[0] & 0xFF0000;
211 g = new_palette[0] & 0xFF00;
212 b = new_palette[0] & 0xFF;
213 for (x = 0; x < avctx->width; x++) {
219 r = new_palette[index] & 0xFF0000;
220 g = new_palette[index] & 0xFF00;
221 b = new_palette[index] & 0xFF;
224 b = (index << 2) | (b & 3);
227 r = (index << 18) | (r & (3 << 16));
230 g = (index << 10) | (g & (3 << 8));
233 AV_WL24(out + x * 3, r | g | b);
235 out += frame->linesize[0];
239 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
240 int *got_frame, AVPacket *pkt)
242 CDXLVideoContext *c = avctx->priv_data;
243 AVFrame * const p = data;
244 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
245 const uint8_t *buf = pkt->data;
248 return AVERROR_INVALIDDATA;
249 encoding = buf[1] & 7;
250 c->format = buf[1] & 0xE0;
251 w = AV_RB16(&buf[14]);
252 h = AV_RB16(&buf[16]);
254 c->palette_size = AV_RB16(&buf[20]);
255 c->palette = buf + 32;
256 c->video = c->palette + c->palette_size;
257 c->video_size = buf_size - c->palette_size - 32;
259 if (c->palette_size > 512)
260 return AVERROR_INVALIDDATA;
261 if (buf_size < c->palette_size + 32)
262 return AVERROR_INVALIDDATA;
264 return AVERROR_INVALIDDATA;
265 if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
266 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
267 return AVERROR_PATCHWELCOME;
270 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
273 if (c->format == CHUNKY)
274 aligned_width = avctx->width;
276 aligned_width = FFALIGN(c->avctx->width, 16);
277 c->padded_bits = aligned_width - c->avctx->width;
278 if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
279 return AVERROR_INVALIDDATA;
280 if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
281 avctx->pix_fmt = AV_PIX_FMT_PAL8;
282 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
283 if (c->palette_size != (1 << (c->bpp - 1)))
284 return AVERROR_INVALIDDATA;
285 avctx->pix_fmt = AV_PIX_FMT_BGR24;
286 } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
288 avctx->pix_fmt = AV_PIX_FMT_RGB24;
290 avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
291 encoding, c->bpp, c->format);
292 return AVERROR_PATCHWELCOME;
295 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
297 p->pict_type = AV_PICTURE_TYPE_I;
300 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
301 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
303 return AVERROR(ENOMEM);
305 cdxl_decode_ham8(c, p);
307 cdxl_decode_ham6(c, p);
308 } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
309 cdxl_decode_rgb(c, p);
311 cdxl_decode_raw(c, p);
318 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
320 CDXLVideoContext *c = avctx->priv_data;
322 av_freep(&c->new_video);
327 AVCodec ff_cdxl_decoder = {
329 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
330 .type = AVMEDIA_TYPE_VIDEO,
331 .id = AV_CODEC_ID_CDXL,
332 .priv_data_size = sizeof(CDXLVideoContext),
333 .init = cdxl_decode_init,
334 .close = cdxl_decode_end,
335 .decode = cdxl_decode_frame,
336 .capabilities = AV_CODEC_CAP_DR1,