rpza.c
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1 /*
2  * Quicktime Video (RPZA) Video Decoder
3  * Copyright (C) 2003 the ffmpeg project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 
41 #include "libavutil/internal.h"
42 #include "libavutil/intreadwrite.h"
43 #include "avcodec.h"
44 
45 typedef struct RpzaContext {
46 
49 
50  const unsigned char *buf;
51  int size;
52 
53 } RpzaContext;
54 
55 #define ADVANCE_BLOCK() \
56 { \
57  pixel_ptr += 4; \
58  if (pixel_ptr >= width) \
59  { \
60  pixel_ptr = 0; \
61  row_ptr += stride * 4; \
62  } \
63  total_blocks--; \
64  if (total_blocks < 0) \
65  { \
66  av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
67  return; \
68  } \
69 }
70 
72 {
73  int width = s->avctx->width;
74  int stride = s->frame.linesize[0] / 2;
75  int row_inc = stride - 4;
76  int stream_ptr = 0;
77  int chunk_size;
78  unsigned char opcode;
79  int n_blocks;
80  unsigned short colorA = 0, colorB;
81  unsigned short color4[4];
82  unsigned char index, idx;
83  unsigned short ta, tb;
84  unsigned short *pixels = (unsigned short *)s->frame.data[0];
85 
86  int row_ptr = 0;
87  int pixel_ptr = 0;
88  int block_ptr;
89  int pixel_x, pixel_y;
90  int total_blocks;
91 
92  /* First byte is always 0xe1. Warn if it's different */
93  if (s->buf[stream_ptr] != 0xe1)
94  av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
95  s->buf[stream_ptr]);
96 
97  /* Get chunk size, ingnoring first byte */
98  chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
99  stream_ptr += 4;
100 
101  /* If length mismatch use size from MOV file and try to decode anyway */
102  if (chunk_size != s->size)
103  av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
104 
105  chunk_size = s->size;
106 
107  /* Number of 4x4 blocks in frame. */
108  total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
109 
110  /* Process chunk data */
111  while (stream_ptr < chunk_size) {
112  opcode = s->buf[stream_ptr++]; /* Get opcode */
113 
114  n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
115 
116  /* If opcode MSbit is 0, we need more data to decide what to do */
117  if ((opcode & 0x80) == 0) {
118  colorA = (opcode << 8) | (s->buf[stream_ptr++]);
119  opcode = 0;
120  if ((s->buf[stream_ptr] & 0x80) != 0) {
121  /* Must behave as opcode 110xxxxx, using colorA computed
122  * above. Use fake opcode 0x20 to enter switch block at
123  * the right place */
124  opcode = 0x20;
125  n_blocks = 1;
126  }
127  }
128 
129  switch (opcode & 0xe0) {
130 
131  /* Skip blocks */
132  case 0x80:
133  while (n_blocks--) {
134  ADVANCE_BLOCK();
135  }
136  break;
137 
138  /* Fill blocks with one color */
139  case 0xa0:
140  colorA = AV_RB16 (&s->buf[stream_ptr]);
141  stream_ptr += 2;
142  while (n_blocks--) {
143  block_ptr = row_ptr + pixel_ptr;
144  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
145  for (pixel_x = 0; pixel_x < 4; pixel_x++){
146  pixels[block_ptr] = colorA;
147  block_ptr++;
148  }
149  block_ptr += row_inc;
150  }
151  ADVANCE_BLOCK();
152  }
153  break;
154 
155  /* Fill blocks with 4 colors */
156  case 0xc0:
157  colorA = AV_RB16 (&s->buf[stream_ptr]);
158  stream_ptr += 2;
159  case 0x20:
160  colorB = AV_RB16 (&s->buf[stream_ptr]);
161  stream_ptr += 2;
162 
163  /* sort out the colors */
164  color4[0] = colorB;
165  color4[1] = 0;
166  color4[2] = 0;
167  color4[3] = colorA;
168 
169  /* red components */
170  ta = (colorA >> 10) & 0x1F;
171  tb = (colorB >> 10) & 0x1F;
172  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
173  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
174 
175  /* green components */
176  ta = (colorA >> 5) & 0x1F;
177  tb = (colorB >> 5) & 0x1F;
178  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
179  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
180 
181  /* blue components */
182  ta = colorA & 0x1F;
183  tb = colorB & 0x1F;
184  color4[1] |= ((11 * ta + 21 * tb) >> 5);
185  color4[2] |= ((21 * ta + 11 * tb) >> 5);
186 
187  if (s->size - stream_ptr < n_blocks * 4)
188  return;
189  while (n_blocks--) {
190  block_ptr = row_ptr + pixel_ptr;
191  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
192  index = s->buf[stream_ptr++];
193  for (pixel_x = 0; pixel_x < 4; pixel_x++){
194  idx = (index >> (2 * (3 - pixel_x))) & 0x03;
195  pixels[block_ptr] = color4[idx];
196  block_ptr++;
197  }
198  block_ptr += row_inc;
199  }
200  ADVANCE_BLOCK();
201  }
202  break;
203 
204  /* Fill block with 16 colors */
205  case 0x00:
206  if (s->size - stream_ptr < 30)
207  return;
208  block_ptr = row_ptr + pixel_ptr;
209  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
210  for (pixel_x = 0; pixel_x < 4; pixel_x++){
211  /* We already have color of upper left pixel */
212  if ((pixel_y != 0) || (pixel_x !=0)) {
213  colorA = AV_RB16 (&s->buf[stream_ptr]);
214  stream_ptr += 2;
215  }
216  pixels[block_ptr] = colorA;
217  block_ptr++;
218  }
219  block_ptr += row_inc;
220  }
221  ADVANCE_BLOCK();
222  break;
223 
224  /* Unknown opcode */
225  default:
226  av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
227  " Skip remaining %d bytes of chunk data.\n", opcode,
228  chunk_size - stream_ptr);
229  return;
230  } /* Opcode switch */
231  }
232 }
233 
235 {
236  RpzaContext *s = avctx->priv_data;
237 
238  s->avctx = avctx;
239  avctx->pix_fmt = AV_PIX_FMT_RGB555;
240 
241  s->frame.data[0] = NULL;
242 
243  return 0;
244 }
245 
247  void *data, int *got_frame,
248  AVPacket *avpkt)
249 {
250  const uint8_t *buf = avpkt->data;
251  int buf_size = avpkt->size;
252  RpzaContext *s = avctx->priv_data;
253 
254  s->buf = buf;
255  s->size = buf_size;
256 
257  s->frame.reference = 1;
259  if (avctx->reget_buffer(avctx, &s->frame)) {
260  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
261  return -1;
262  }
263 
265 
266  *got_frame = 1;
267  *(AVFrame*)data = s->frame;
268 
269  /* always report that the buffer was completely consumed */
270  return buf_size;
271 }
272 
274 {
275  RpzaContext *s = avctx->priv_data;
276 
277  if (s->frame.data[0])
278  avctx->release_buffer(avctx, &s->frame);
279 
280  return 0;
281 }
282 
284  .name = "rpza",
285  .type = AVMEDIA_TYPE_VIDEO,
286  .id = AV_CODEC_ID_RPZA,
287  .priv_data_size = sizeof(RpzaContext),
291  .capabilities = CODEC_CAP_DR1,
292  .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
293 };
static int rpza_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: rpza.c:246
This structure describes decoded (raw) audio or video data.
Definition: avcodec.h:989
struct RpzaContext RpzaContext
int buffer_hints
codec suggestion on buffer type if != 0
Definition: avcodec.h:1253
void(* release_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called to release buffers which were allocated with get_buffer.
Definition: avcodec.h:2259
int size
Definition: avcodec.h:916
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1533
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2960
int(* reget_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called at the beginning of a frame to get cr buffer for it.
Definition: avcodec.h:2273
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:228
static void rpza_decode_stream(RpzaContext *s)
Definition: rpza.c:71
uint8_t
#define AV_RB32
Definition: intreadwrite.h:130
AVCodec ff_rpza_decoder
Definition: rpza.c:283
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:915
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:335
static av_cold int rpza_decode_end(AVCodecContext *avctx)
Definition: rpza.c:273
int reference
is this picture used as reference The values for this are the same as the MpegEncContext.picture_structure variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
Definition: avcodec.h:1132
#define AV_RB16
Definition: intreadwrite.h:53
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
const char * name
Name of the codec implementation.
Definition: avcodec.h:2967
common internal API header
int width
picture width / height.
Definition: avcodec.h:1508
static av_cold int rpza_decode_init(AVCodecContext *avctx)
Definition: rpza.c:234
NULL
Definition: eval.c:52
static int width
Definition: utils.c:156
int size
Definition: rpza.c:51
external API header
int linesize[AV_NUM_DATA_POINTERS]
Size, in bytes, of the data for each picture/channel plane.
Definition: avcodec.h:1008
main external API structure.
Definition: avcodec.h:1339
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:326
int index
Definition: gxfenc.c:72
const unsigned char * buf
Definition: rpza.c:50
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
AVCodecContext * avctx
Definition: rpza.c:47
void * priv_data
Definition: avcodec.h:1382
#define ADVANCE_BLOCK()
Definition: rpza.c:55
AVFrame frame
Definition: rpza.c:48
This structure stores compressed data.
Definition: avcodec.h:898
if(!(ptr_align%ac->ptr_align)&&samples_align >=aligned_len)