Libav
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 <stdint.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 
42 #include "libavutil/internal.h"
43 #include "avcodec.h"
44 #include "bytestream.h"
45 #include "internal.h"
46 
47 typedef struct RpzaContext {
48 
51 
53 } RpzaContext;
54 
55 #define CHECK_BLOCK() \
56  if (total_blocks < 1) { \
57  av_log(s->avctx, AV_LOG_ERROR, \
58  "Block counter just went negative (this should not happen)\n"); \
59  return AVERROR_INVALIDDATA; \
60  } \
61 
62 #define ADVANCE_BLOCK() \
63  { \
64  pixel_ptr += 4; \
65  if (pixel_ptr >= width) \
66  { \
67  pixel_ptr = 0; \
68  row_ptr += stride * 4; \
69  } \
70  total_blocks--; \
71  }
72 
74 {
75  int width = s->avctx->width;
76  int stride = s->frame->linesize[0] / 2;
77  int row_inc = stride - 4;
78  int chunk_size;
79  uint16_t colorA = 0, colorB;
80  uint16_t color4[4];
81  uint16_t ta, tb;
82  uint16_t *pixels = (uint16_t *)s->frame->data[0];
83 
84  int row_ptr = 0;
85  int pixel_ptr = 0;
86  int block_ptr;
87  int pixel_x, pixel_y;
88  int total_blocks;
89 
90  /* First byte is always 0xe1. Warn if it's different */
91  if (bytestream2_peek_byte(&s->gb) != 0xe1)
92  av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
93  bytestream2_peek_byte(&s->gb));
94 
95  /* Get chunk size, ingnoring first byte */
96  chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
97 
98  /* If length mismatch use size from MOV file and try to decode anyway */
99  if (chunk_size != bytestream2_get_bytes_left(&s->gb) - 4)
100  av_log(s->avctx, AV_LOG_WARNING, "MOV chunk size != encoded chunk size\n");
101 
102  /* Number of 4x4 blocks in frame. */
103  total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
104 
105  /* Process chunk data */
106  while (bytestream2_get_bytes_left(&s->gb)) {
107  uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
108 
109  int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
110 
111  /* If opcode MSbit is 0, we need more data to decide what to do */
112  if ((opcode & 0x80) == 0) {
113  colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
114  opcode = 0;
115  if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
116  /* Must behave as opcode 110xxxxx, using colorA computed
117  * above. Use fake opcode 0x20 to enter switch block at
118  * the right place */
119  opcode = 0x20;
120  n_blocks = 1;
121  }
122  }
123 
124  n_blocks = FFMIN(n_blocks, total_blocks);
125 
126  switch (opcode & 0xe0) {
127 
128  /* Skip blocks */
129  case 0x80:
130  while (n_blocks--) {
131  CHECK_BLOCK();
132  ADVANCE_BLOCK();
133  }
134  break;
135 
136  /* Fill blocks with one color */
137  case 0xa0:
138  colorA = bytestream2_get_be16(&s->gb);
139  while (n_blocks--) {
140  CHECK_BLOCK();
141  block_ptr = row_ptr + pixel_ptr;
142  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
143  for (pixel_x = 0; pixel_x < 4; pixel_x++){
144  pixels[block_ptr] = colorA;
145  block_ptr++;
146  }
147  block_ptr += row_inc;
148  }
149  ADVANCE_BLOCK();
150  }
151  break;
152 
153  /* Fill blocks with 4 colors */
154  case 0xc0:
155  colorA = bytestream2_get_be16(&s->gb);
156  case 0x20:
157  colorB = bytestream2_get_be16(&s->gb);
158 
159  /* sort out the colors */
160  color4[0] = colorB;
161  color4[1] = 0;
162  color4[2] = 0;
163  color4[3] = colorA;
164 
165  /* red components */
166  ta = (colorA >> 10) & 0x1F;
167  tb = (colorB >> 10) & 0x1F;
168  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
169  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
170 
171  /* green components */
172  ta = (colorA >> 5) & 0x1F;
173  tb = (colorB >> 5) & 0x1F;
174  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
175  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
176 
177  /* blue components */
178  ta = colorA & 0x1F;
179  tb = colorB & 0x1F;
180  color4[1] |= ((11 * ta + 21 * tb) >> 5);
181  color4[2] |= ((21 * ta + 11 * tb) >> 5);
182 
183  if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
184  return AVERROR_INVALIDDATA;
185  while (n_blocks--) {
186  CHECK_BLOCK();
187  block_ptr = row_ptr + pixel_ptr;
188  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
189  uint8_t index = bytestream2_get_byteu(&s->gb);
190  for (pixel_x = 0; pixel_x < 4; pixel_x++){
191  uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
192  pixels[block_ptr] = color4[idx];
193  block_ptr++;
194  }
195  block_ptr += row_inc;
196  }
197  ADVANCE_BLOCK();
198  }
199  break;
200 
201  /* Fill block with 16 colors */
202  case 0x00:
203  if (bytestream2_get_bytes_left(&s->gb) < 30)
204  return AVERROR_INVALIDDATA;
205  CHECK_BLOCK();
206  block_ptr = row_ptr + pixel_ptr;
207  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
208  for (pixel_x = 0; pixel_x < 4; pixel_x++){
209  /* We already have color of upper left pixel */
210  if ((pixel_y != 0) || (pixel_x != 0))
211  colorA = bytestream2_get_be16u(&s->gb);
212  pixels[block_ptr] = colorA;
213  block_ptr++;
214  }
215  block_ptr += row_inc;
216  }
217  ADVANCE_BLOCK();
218  break;
219 
220  /* Unknown opcode */
221  default:
222  av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
223  " Skip remaining %d bytes of chunk data.\n", opcode,
225  return AVERROR_INVALIDDATA;
226  } /* Opcode switch */
227  }
228 
229  return 0;
230 }
231 
233 {
234  RpzaContext *s = avctx->priv_data;
235 
236  s->avctx = avctx;
237  avctx->pix_fmt = AV_PIX_FMT_RGB555;
238 
239  s->frame = av_frame_alloc();
240  if (!s->frame)
241  return AVERROR(ENOMEM);
242 
243  return 0;
244 }
245 
247  void *data, int *got_frame,
248  AVPacket *avpkt)
249 {
250  RpzaContext *s = avctx->priv_data;
251  int ret;
252 
253  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
254 
255  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
256  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
257  return ret;
258  }
259 
260  ret = rpza_decode_stream(s);
261  if (ret < 0)
262  return ret;
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 avpkt->size;
271 }
272 
274 {
275  RpzaContext *s = avctx->priv_data;
276 
277  av_frame_free(&s->frame);
278 
279  return 0;
280 }
281 
283  .name = "rpza",
284  .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
285  .type = AVMEDIA_TYPE_VIDEO,
286  .id = AV_CODEC_ID_RPZA,
287  .priv_data_size = sizeof(RpzaContext),
291  .capabilities = CODEC_CAP_DR1,
292 };
static int rpza_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: rpza.c:246
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:129
int size
Definition: avcodec.h:974
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1270
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:132
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2812
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:188
AVCodec ff_rpza_decoder
Definition: rpza.c:282
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:973
static av_cold int rpza_decode_end(AVCodecContext *avctx)
Definition: rpza.c:273
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
GetByteContext gb
Definition: rpza.c:52
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:69
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:151
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2819
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...
Definition: utils.c:808
#define FFMIN(a, b)
Definition: common.h:57
int width
picture width / height.
Definition: avcodec.h:1229
static int rpza_decode_stream(RpzaContext *s)
Definition: rpza.c:73
if(ac->has_optimized_func)
static av_cold int rpza_decode_init(AVCodecContext *avctx)
Definition: rpza.c:232
static int width
Definition: utils.c:156
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
int index
Definition: gxfenc.c:72
AVFrame * frame
Definition: rpza.c:50
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
common internal api header.
AVCodecContext * avctx
Definition: rpza.c:49
#define CHECK_BLOCK()
Definition: rpza.c:55
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:231
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
#define ADVANCE_BLOCK()
Definition: rpza.c:62
This structure stores compressed data.
Definition: avcodec.h:950