FFmpeg
cdxl.c
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1 /*
2  * CDXL video decoder
3  * Copyright (c) 2011-2012 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 /**
23  * @file
24  * Commodore CDXL video decoder
25  * @author Paul B Mahol
26  */
27 
28 #define UNCHECKED_BITSTREAM_READER 1
29 
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/imgutils.h"
32 #include "avcodec.h"
33 #include "bytestream.h"
34 #include "get_bits.h"
35 #include "internal.h"
36 
37 #define BIT_PLANAR 0x00
38 #define CHUNKY 0x20
39 #define BYTE_PLANAR 0x40
40 #define BIT_LINE 0x80
41 #define BYTE_LINE 0xC0
42 
43 typedef struct CDXLVideoContext {
45  int bpp;
46  int format;
48  const uint8_t *palette;
50  const uint8_t *video;
55 
57 {
58  CDXLVideoContext *c = avctx->priv_data;
59 
60  c->new_video_size = 0;
61  c->avctx = avctx;
62 
63  return 0;
64 }
65 
66 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
67 {
68  int i;
69 
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);
76  }
77 }
78 
79 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
80 {
81  GetBitContext gb;
82  int x, y, plane;
83 
84  if (init_get_bits8(&gb, c->video, c->video_size) < 0)
85  return;
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);
91  }
92  }
93 }
94 
95 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
96 {
97  GetBitContext gb;
98  int x, y, plane;
99 
100  if (init_get_bits8(&gb, c->video, c->video_size) < 0)
101  return;
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);
107  }
108  }
109 }
110 
111 static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
112 {
113  GetByteContext gb;
114  int y;
115 
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);
119  }
120 }
121 
122 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
123 {
124  memset(out, 0, linesize * c->avctx->height);
125 
126  switch (c->format) {
127  case BIT_PLANAR:
128  bitplanar2chunky(c, linesize, out);
129  break;
130  case BIT_LINE:
131  bitline2chunky(c, linesize, out);
132  break;
133  case CHUNKY:
134  chunky2chunky(c, linesize, out);
135  break;
136  }
137 }
138 
140 {
141  uint32_t *new_palette = (uint32_t *)frame->data[1];
142 
143  memset(frame->data[1], 0, AVPALETTE_SIZE);
144  import_palette(c, new_palette);
145  import_format(c, frame->linesize[0], frame->data[0]);
146 }
147 
149 {
150  import_format(c, frame->linesize[0], frame->data[0]);
151 }
152 
154 {
155  AVCodecContext *avctx = c->avctx;
156  uint32_t new_palette[16], r, g, b;
157  uint8_t *ptr, *out, index, op;
158  int x, y;
159 
160  ptr = c->new_video;
161  out = frame->data[0];
162 
163  import_palette(c, new_palette);
164  import_format(c, avctx->width, c->new_video);
165 
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++) {
171  index = *ptr++;
172  op = index >> 4;
173  index &= 15;
174  switch (op) {
175  case 0:
176  r = new_palette[index] & 0xFF0000;
177  g = new_palette[index] & 0xFF00;
178  b = new_palette[index] & 0xFF;
179  break;
180  case 1:
181  b = index * 0x11;
182  break;
183  case 2:
184  r = index * 0x11 << 16;
185  break;
186  case 3:
187  g = index * 0x11 << 8;
188  break;
189  }
190  AV_WL24(out + x * 3, r | g | b);
191  }
192  out += frame->linesize[0];
193  }
194 }
195 
197 {
198  AVCodecContext *avctx = c->avctx;
199  uint32_t new_palette[64], r, g, b;
200  uint8_t *ptr, *out, index, op;
201  int x, y;
202 
203  ptr = c->new_video;
204  out = frame->data[0];
205 
206  import_palette(c, new_palette);
207  import_format(c, avctx->width, c->new_video);
208 
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++) {
214  index = *ptr++;
215  op = index >> 6;
216  index &= 63;
217  switch (op) {
218  case 0:
219  r = new_palette[index] & 0xFF0000;
220  g = new_palette[index] & 0xFF00;
221  b = new_palette[index] & 0xFF;
222  break;
223  case 1:
224  b = (index << 2) | (b & 3);
225  break;
226  case 2:
227  r = (index << 18) | (r & (3 << 16));
228  break;
229  case 3:
230  g = (index << 10) | (g & (3 << 8));
231  break;
232  }
233  AV_WL24(out + x * 3, r | g | b);
234  }
235  out += frame->linesize[0];
236  }
237 }
238 
240  int *got_frame, AVPacket *pkt)
241 {
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;
246 
247  if (buf_size < 32)
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]);
253  c->bpp = buf[19];
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;
258 
259  if (c->palette_size > 512)
260  return AVERROR_INVALIDDATA;
261  if (buf_size < c->palette_size + 32)
262  return AVERROR_INVALIDDATA;
263  if (c->bpp < 1)
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;
268  }
269 
270  if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
271  return ret;
272 
273  if (c->format == CHUNKY)
274  aligned_width = avctx->width;
275  else
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 &&
287  !c->palette_size) {
288  avctx->pix_fmt = AV_PIX_FMT_RGB24;
289  } else {
290  avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
291  encoding, c->bpp, c->format);
292  return AVERROR_PATCHWELCOME;
293  }
294 
295  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
296  return ret;
298 
299  if (encoding) {
302  if (!c->new_video)
303  return AVERROR(ENOMEM);
304  if (c->bpp == 8)
305  cdxl_decode_ham8(c, p);
306  else
307  cdxl_decode_ham6(c, p);
308  } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
309  cdxl_decode_rgb(c, p);
310  } else {
311  cdxl_decode_raw(c, p);
312  }
313  *got_frame = 1;
314 
315  return buf_size;
316 }
317 
319 {
320  CDXLVideoContext *c = avctx->priv_data;
321 
322  av_freep(&c->new_video);
323 
324  return 0;
325 }
326 
328  .name = "cdxl",
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),
334  .close = cdxl_decode_end,
336  .capabilities = AV_CODEC_CAP_DR1,
337 };
int plane
Definition: avisynth_c.h:384
#define BIT_LINE
Definition: cdxl.c:40
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
int format
Definition: cdxl.c:46
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
misc image utilities
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:104
const char * g
Definition: vf_curves.c:115
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int video_size
Definition: cdxl.c:51
int size
Definition: avcodec.h:1478
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:70
static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:196
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
AVCodec.
Definition: avcodec.h:3477
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
const uint8_t * palette
Definition: cdxl.c:48
#define AV_WL24(p, d)
Definition: intreadwrite.h:464
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
uint8_t
#define av_cold
Definition: attributes.h:82
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AVCodec ff_cdxl_decoder
Definition: cdxl.c:327
static av_cold int cdxl_decode_end(AVCodecContext *avctx)
Definition: cdxl.c:318
uint8_t * data
Definition: avcodec.h:1477
static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:111
bitstream reader API header.
#define FFALIGN(x, a)
Definition: macros.h:48
static int cdxl_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *pkt)
Definition: cdxl.c:239
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * r
Definition: vf_curves.c:114
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:263
const char * name
Name of the codec implementation.
Definition: avcodec.h:3484
static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:95
#define b
Definition: input.c:41
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:351
#define CHUNKY
Definition: cdxl.c:38
int width
picture width / height.
Definition: avcodec.h:1738
uint8_t w
Definition: llviddspenc.c:38
static av_cold int cdxl_decode_init(AVCodecContext *avctx)
Definition: cdxl.c:56
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:299
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:1565
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1964
void * buf
Definition: avisynth_c.h:766
AVCodecContext * avctx
Definition: cdxl.c:44
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
int index
Definition: gxfenc.c:89
uint8_t * new_video
Definition: cdxl.c:52
#define BIT_PLANAR
Definition: cdxl.c:37
int new_video_size
Definition: cdxl.c:53
static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:79
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:282
static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:139
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:78
common internal api header.
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:790
void * priv_data
Definition: avcodec.h:1592
static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:153
const uint8_t * video
Definition: cdxl.c:50
FILE * out
Definition: movenc.c:54
static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:122
#define av_freep(p)
int palette_size
Definition: cdxl.c:49
int padded_bits
Definition: cdxl.c:47
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
Definition: cdxl.c:66
static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:148