FFmpeg  4.4
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 
245 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
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) {
312  av_fast_padded_malloc(&c->new_video, &c->new_video_size,
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 av_cold
Definition: attributes.h:88
uint8_t
Libavcodec external API header.
#define AV_RB24
Definition: intreadwrite.h:64
#define AV_RB16
Definition: intreadwrite.h:53
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:267
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1893
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static AVFrame * frame
bitstream reader API header.
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
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
@ AV_CODEC_ID_CDXL
Definition: codec_id.h:208
#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 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:50
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
int index
Definition: gxfenc.c:89
misc image utilities
int i
Definition: input.c:407
#define AV_WN32(p, v)
Definition: intreadwrite.h:376
#define AV_WL24(p, d)
Definition: intreadwrite.h:464
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
#define BIT_LINE
Definition: cdxl.c:40
static av_cold int cdxl_decode_init(AVCodecContext *avctx)
Definition: cdxl.c:57
static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:154
AVCodec ff_cdxl_decoder
Definition: cdxl.c:339
#define BIT_PLANAR
Definition: cdxl.c:37
static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:85
static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:117
static av_cold int cdxl_decode_end(AVCodecContext *avctx)
Definition: cdxl.c:330
static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:159
static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:128
static int cdxl_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *pkt)
Definition: cdxl.c:245
static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
Definition: cdxl.c:67
static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:145
static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
Definition: cdxl.c:101
#define CHUNKY
Definition: cdxl.c:38
static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
Definition: cdxl.c:202
#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:41
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:84
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
uint8_t w
Definition: llviddspenc.c:39
#define FFALIGN(x, a)
Definition: macros.h:48
const char data[16]
Definition: mxf.c:142
@ AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:69
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int width
picture width / height.
Definition: avcodec.h:709
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:396
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:401
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
int format
Definition: cdxl.c:47
int video_size
Definition: cdxl.c:52
const uint8_t * palette
Definition: cdxl.c:49
AVCodecContext * avctx
Definition: cdxl.c:44
const uint8_t * video
Definition: cdxl.c:51
int palette_size
Definition: cdxl.c:50
uint8_t * new_video
Definition: cdxl.c:53
int padded_bits
Definition: cdxl.c:48
int new_video_size
Definition: cdxl.c:54
Definition: rpzaenc.c:58
#define avpriv_request_sample(...)
#define av_freep(p)
FILE * out
Definition: movenc.c:54
AVPacket * pkt
Definition: movenc.c:59
const char * b
Definition: vf_curves.c:118
const char * g
Definition: vf_curves.c:117
const char * r
Definition: vf_curves.c:116
static double c[64]