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 type;
47  int format;
49  const uint8_t *palette;
51  const uint8_t *video;
56 
58 {
59  CDXLVideoContext *c = avctx->priv_data;
60 
61  c->new_video_size = 0;
62  c->avctx = avctx;
63 
64  return 0;
65 }
66 
67 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
68 {
69  if (c->type == 1) {
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);
76  }
77  } else {
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);
81  }
82  }
83 }
84 
85 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
86 {
87  GetBitContext gb;
88  int x, y, plane;
89 
90  if (init_get_bits8(&gb, c->video, c->video_size) < 0)
91  return;
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);
97  }
98  }
99 }
100 
101 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
102 {
103  GetBitContext gb;
104  int x, y, plane;
105 
106  if (init_get_bits8(&gb, c->video, c->video_size) < 0)
107  return;
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);
113  }
114  }
115 }
116 
117 static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
118 {
119  GetByteContext gb;
120  int y;
121 
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);
125  }
126 }
127 
128 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
129 {
130  memset(out, 0, linesize * c->avctx->height);
131 
132  switch (c->format) {
133  case BIT_PLANAR:
134  bitplanar2chunky(c, linesize, out);
135  break;
136  case BIT_LINE:
137  bitline2chunky(c, linesize, out);
138  break;
139  case CHUNKY:
140  chunky2chunky(c, linesize, out);
141  break;
142  }
143 }
144 
146 {
147  uint32_t *new_palette = (uint32_t *)frame->data[1];
148 
149  memset(frame->data[1], 0, AVPALETTE_SIZE);
150  import_palette(c, new_palette);
151  import_format(c, frame->linesize[0], frame->data[0]);
152 }
153 
155 {
156  import_format(c, frame->linesize[0], frame->data[0]);
157 }
158 
160 {
161  AVCodecContext *avctx = c->avctx;
162  uint32_t new_palette[16], r, g, b;
163  uint8_t *ptr, *out, index, op;
164  int x, y;
165 
166  ptr = c->new_video;
167  out = frame->data[0];
168 
169  import_palette(c, new_palette);
170  import_format(c, avctx->width, c->new_video);
171 
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++) {
177  index = *ptr++;
178  op = index >> 4;
179  index &= 15;
180  switch (op) {
181  case 0:
182  r = new_palette[index] & 0xFF0000;
183  g = new_palette[index] & 0xFF00;
184  b = new_palette[index] & 0xFF;
185  break;
186  case 1:
187  b = index * 0x11;
188  break;
189  case 2:
190  r = index * 0x11 << 16;
191  break;
192  case 3:
193  g = index * 0x11 << 8;
194  break;
195  }
196  AV_WL24(out + x * 3, r | g | b);
197  }
198  out += frame->linesize[0];
199  }
200 }
201 
203 {
204  AVCodecContext *avctx = c->avctx;
205  uint32_t new_palette[64], r, g, b;
206  uint8_t *ptr, *out, index, op;
207  int x, y;
208 
209  ptr = c->new_video;
210  out = frame->data[0];
211 
212  import_palette(c, new_palette);
213  import_format(c, avctx->width, c->new_video);
214 
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++) {
220  index = *ptr++;
221  op = index >> 6;
222  index &= 63;
223  switch (op) {
224  case 0:
225  r = new_palette[index] & 0xFF0000;
226  g = new_palette[index] & 0xFF00;
227  b = new_palette[index] & 0xFF;
228  break;
229  case 1:
230  b = (index << 2) | (b & 3);
231  break;
232  case 2:
233  r = (index << 18) | (r & (3 << 16));
234  break;
235  case 3:
236  g = (index << 10) | (g & (3 << 8));
237  break;
238  }
239  AV_WL24(out + x * 3, r | g | b);
240  }
241  out += frame->linesize[0];
242  }
243 }
244 
246  int *got_frame, AVPacket *pkt)
247 {
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;
252 
253  if (buf_size < 32)
254  return AVERROR_INVALIDDATA;
255  c->type = buf[0];
256  encoding = buf[1] & 7;
257  c->format = buf[1] & 0xE0;
258  w = AV_RB16(&buf[14]);
259  h = AV_RB16(&buf[16]);
260  c->bpp = buf[19];
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;
265 
266  if (c->type > 1)
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;
274  if (c->bpp < 1)
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;
279  }
280 
281  if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
282  return ret;
283 
284  if (c->format == CHUNKY)
285  aligned_width = avctx->width;
286  else
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 &&
298  !c->palette_size) {
299  avctx->pix_fmt = AV_PIX_FMT_RGB24;
300  } else {
301  avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
302  encoding, c->bpp, c->format);
303  return AVERROR_PATCHWELCOME;
304  }
305 
306  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
307  return ret;
309  p->key_frame = 1;
310 
311  if (encoding) {
314  if (!c->new_video)
315  return AVERROR(ENOMEM);
316  if (c->bpp == 8)
317  cdxl_decode_ham8(c, p);
318  else
319  cdxl_decode_ham6(c, p);
320  } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
321  cdxl_decode_rgb(c, p);
322  } else {
323  cdxl_decode_raw(c, p);
324  }
325  *got_frame = 1;
326 
327  return buf_size;
328 }
329 
331 {
332  CDXLVideoContext *c = avctx->priv_data;
333 
334  av_freep(&c->new_video);
335 
336  return 0;
337 }
338 
340  .name = "cdxl",
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),
346  .close = cdxl_decode_end,
348  .capabilities = AV_CODEC_CAP_DR1,
349  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
350 };
#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:314
int format
Definition: cdxl.c:47
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:106
const char * g
Definition: vf_curves.c:117
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define avpriv_request_sample(...)
int video_size
Definition: cdxl.c:52
int size
Definition: packet.h:364
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:741
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
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:72
static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:202
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:91
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
const uint8_t * palette
Definition: cdxl.c:49
#define AV_WL24(p, d)
Definition: intreadwrite.h:464
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
uint8_t
#define av_cold
Definition: attributes.h:88
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:339
static av_cold int cdxl_decode_end(AVCodecContext *avctx)
Definition: cdxl.c:330
uint8_t * data
Definition: packet.h:363
static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:117
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:245
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:115
const char * r
Definition: vf_curves.c:116
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:267
const char * name
Name of the codec implementation.
Definition: codec.h:197
static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:101
#define b
Definition: input.c:41
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:397
#define CHUNKY
Definition: cdxl.c:38
int width
picture width / height.
Definition: avcodec.h:704
uint8_t w
Definition: llviddspenc.c:39
static av_cold int cdxl_decode_init(AVCodecContext *avctx)
Definition: cdxl.c:57
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.
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_RB24
Definition: bytestream.h:91
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:345
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:531
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1884
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:53
#define BIT_PLANAR
Definition: cdxl.c:37
int new_video_size
Definition: cdxl.c:54
static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:85
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:328
static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:145
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:75
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:215
void * priv_data
Definition: avcodec.h:558
static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:159
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:392
const uint8_t * video
Definition: cdxl.c:51
FILE * out
Definition: movenc.c:54
static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:128
#define av_freep(p)
int palette_size
Definition: cdxl.c:50
int padded_bits
Definition: cdxl.c:48
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: packet.h:340
Definition: rpzaenc.c:58
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
Definition: cdxl.c:67
int i
Definition: input.c:407
static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:154