rpza.c
Go to the documentation of this file.
1 /*
2  * Quicktime Video (RPZA) Video Decoder
3  * Copyright (C) 2003 the ffmpeg project
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  * QT RPZA Video Decoder by Roberto Togni
25  * For more information about the RPZA format, visit:
26  * http://www.pcisys.net/~melanson/codecs/
27  *
28  * The RPZA decoder outputs RGB555 colorspace data.
29  *
30  * Note that this decoder reads big endian RGB555 pixel values from the
31  * bytestream, arranges them in the host's endian order, and outputs
32  * them to the final rendered map in the same host endian order. This is
33  * intended behavior as the libavcodec documentation states that RGB555
34  * pixels shall be stored in native CPU endianness.
35  */
36 
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 #include "internal.h"
45 
46 typedef struct RpzaContext {
47 
50 
51  const unsigned char *buf;
52  int size;
53 
54 } RpzaContext;
55 
56 #define ADVANCE_BLOCK() \
57 { \
58  pixel_ptr += 4; \
59  if (pixel_ptr >= width) \
60  { \
61  pixel_ptr = 0; \
62  row_ptr += stride * 4; \
63  } \
64  total_blocks--; \
65  if (total_blocks < 0) \
66  { \
67  av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
68  return; \
69  } \
70 }
71 
73 {
74  int width = s->avctx->width;
75  int stride = s->frame.linesize[0] / 2;
76  int row_inc = stride - 4;
77  int stream_ptr = 0;
78  int chunk_size;
79  unsigned char opcode;
80  int n_blocks;
81  unsigned short colorA = 0, colorB;
82  unsigned short color4[4];
83  unsigned char index, idx;
84  unsigned short ta, tb;
85  unsigned short *pixels = (unsigned short *)s->frame.data[0];
86 
87  int row_ptr = 0;
88  int pixel_ptr = 0;
89  int block_ptr;
90  int pixel_x, pixel_y;
91  int total_blocks;
92 
93  /* First byte is always 0xe1. Warn if it's different */
94  if (s->buf[stream_ptr] != 0xe1)
95  av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
96  s->buf[stream_ptr]);
97 
98  /* Get chunk size, ingnoring first byte */
99  chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
100  stream_ptr += 4;
101 
102  /* If length mismatch use size from MOV file and try to decode anyway */
103  if (chunk_size != s->size)
104  av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
105 
106  chunk_size = s->size;
107 
108  /* Number of 4x4 blocks in frame. */
109  total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
110 
111  /* Process chunk data */
112  while (stream_ptr < chunk_size) {
113  opcode = s->buf[stream_ptr++]; /* Get opcode */
114 
115  n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
116 
117  /* If opcode MSbit is 0, we need more data to decide what to do */
118  if ((opcode & 0x80) == 0) {
119  colorA = (opcode << 8) | (s->buf[stream_ptr++]);
120  opcode = 0;
121  if ((s->buf[stream_ptr] & 0x80) != 0) {
122  /* Must behave as opcode 110xxxxx, using colorA computed
123  * above. Use fake opcode 0x20 to enter switch block at
124  * the right place */
125  opcode = 0x20;
126  n_blocks = 1;
127  }
128  }
129 
130  switch (opcode & 0xe0) {
131 
132  /* Skip blocks */
133  case 0x80:
134  while (n_blocks--) {
135  ADVANCE_BLOCK();
136  }
137  break;
138 
139  /* Fill blocks with one color */
140  case 0xa0:
141  colorA = AV_RB16 (&s->buf[stream_ptr]);
142  stream_ptr += 2;
143  while (n_blocks--) {
144  block_ptr = row_ptr + pixel_ptr;
145  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
146  for (pixel_x = 0; pixel_x < 4; pixel_x++){
147  pixels[block_ptr] = colorA;
148  block_ptr++;
149  }
150  block_ptr += row_inc;
151  }
152  ADVANCE_BLOCK();
153  }
154  break;
155 
156  /* Fill blocks with 4 colors */
157  case 0xc0:
158  colorA = AV_RB16 (&s->buf[stream_ptr]);
159  stream_ptr += 2;
160  case 0x20:
161  colorB = AV_RB16 (&s->buf[stream_ptr]);
162  stream_ptr += 2;
163 
164  /* sort out the colors */
165  color4[0] = colorB;
166  color4[1] = 0;
167  color4[2] = 0;
168  color4[3] = colorA;
169 
170  /* red components */
171  ta = (colorA >> 10) & 0x1F;
172  tb = (colorB >> 10) & 0x1F;
173  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
174  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
175 
176  /* green components */
177  ta = (colorA >> 5) & 0x1F;
178  tb = (colorB >> 5) & 0x1F;
179  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
180  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
181 
182  /* blue components */
183  ta = colorA & 0x1F;
184  tb = colorB & 0x1F;
185  color4[1] |= ((11 * ta + 21 * tb) >> 5);
186  color4[2] |= ((21 * ta + 11 * tb) >> 5);
187 
188  if (s->size - stream_ptr < n_blocks * 4)
189  return;
190  while (n_blocks--) {
191  block_ptr = row_ptr + pixel_ptr;
192  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
193  index = s->buf[stream_ptr++];
194  for (pixel_x = 0; pixel_x < 4; pixel_x++){
195  idx = (index >> (2 * (3 - pixel_x))) & 0x03;
196  pixels[block_ptr] = color4[idx];
197  block_ptr++;
198  }
199  block_ptr += row_inc;
200  }
201  ADVANCE_BLOCK();
202  }
203  break;
204 
205  /* Fill block with 16 colors */
206  case 0x00:
207  if (s->size - stream_ptr < 16)
208  return;
209  block_ptr = row_ptr + pixel_ptr;
210  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
211  for (pixel_x = 0; pixel_x < 4; pixel_x++){
212  /* We already have color of upper left pixel */
213  if ((pixel_y != 0) || (pixel_x !=0)) {
214  colorA = AV_RB16 (&s->buf[stream_ptr]);
215  stream_ptr += 2;
216  }
217  pixels[block_ptr] = colorA;
218  block_ptr++;
219  }
220  block_ptr += row_inc;
221  }
222  ADVANCE_BLOCK();
223  break;
224 
225  /* Unknown opcode */
226  default:
227  av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
228  " Skip remaining %d bytes of chunk data.\n", opcode,
229  chunk_size - stream_ptr);
230  return;
231  } /* Opcode switch */
232  }
233 }
234 
236 {
237  RpzaContext *s = avctx->priv_data;
238 
239  s->avctx = avctx;
240  avctx->pix_fmt = AV_PIX_FMT_RGB555;
241 
243 
244  return 0;
245 }
246 
248  void *data, int *got_frame,
249  AVPacket *avpkt)
250 {
251  const uint8_t *buf = avpkt->data;
252  int buf_size = avpkt->size;
253  RpzaContext *s = avctx->priv_data;
254  int ret;
255 
256  s->buf = buf;
257  s->size = buf_size;
258 
259  if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
260  return ret;
261 
263 
264  if ((ret = av_frame_ref(data, &s->frame)) < 0)
265  return ret;
266 
267  *got_frame = 1;
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  av_frame_unref(&s->frame);
278 
279  return 0;
280 }
281 
283  .name = "rpza",
284  .type = AVMEDIA_TYPE_VIDEO,
285  .id = AV_CODEC_ID_RPZA,
286  .priv_data_size = sizeof(RpzaContext),
290  .capabilities = CODEC_CAP_DR1,
291  .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
292 };
static int rpza_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: rpza.c:247
const char * s
Definition: avisynth_c.h:668
This structure describes decoded (raw) audio or video data.
Definition: frame.h:76
struct RpzaContext RpzaContext
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
#define ta
Definition: regdef.h:67
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int stride
Definition: mace.c:144
initialize output if(nPeaks >3)%at least 3 peaks in spectrum for trying to find f0 nf0peaks
static void rpza_decode_stream(RpzaContext *s)
Definition: rpza.c:72
uint8_t
#define av_cold
Definition: attributes.h:78
#define AV_RB32
AVCodec ff_rpza_decoder
Definition: rpza.c:282
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
uint8_t * data
static av_cold int rpza_decode_end(AVCodecContext *avctx)
Definition: rpza.c:273
#define AV_RB16
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Spectrum Plot time data
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:246
const char * name
Name of the codec implementation.
external API header
common internal API header
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
ret
Definition: avfilter.c:821
int width
picture width / height.
static av_cold int rpza_decode_init(AVCodecContext *avctx)
Definition: rpza.c:235
static int width
Definition: tests/utils.c:158
int size
Definition: rpza.c:52
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:101
main external API structure.
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:375
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:148
void avcodec_get_frame_defaults(AVFrame *frame)
Set the fields of the given AVFrame to default values.
int index
Definition: gxfenc.c:89
const unsigned char * buf
Definition: rpza.c:51
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:330
int av_frame_ref(AVFrame *dst, AVFrame *src)
Setup a new reference to the data described by an given frame.
Definition: frame.c:228
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:87
common internal api header.
AVCodecContext * avctx
Definition: rpza.c:48
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:269
#define ADVANCE_BLOCK()
Definition: rpza.c:56
static int decode(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: crystalhd.c:868
AVFrame frame
Definition: rpza.c:49
This structure stores compressed data.
#define tb
Definition: regdef.h:68