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 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 chunk_size;
77  uint16_t colorA = 0, colorB;
78  uint16_t color4[4];
79  uint16_t ta, tb;
80  uint16_t *pixels = (uint16_t *)s->frame->data[0];
81 
82  int row_ptr = 0;
83  int pixel_ptr = 0;
84  int block_ptr;
85  int pixel_x, pixel_y;
86  int total_blocks;
87 
88  /* First byte is always 0xe1. Warn if it's different */
89  if (bytestream2_peek_byte(&s->gb) != 0xe1)
90  av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
91  bytestream2_peek_byte(&s->gb));
92 
93  /* Get chunk size, ingnoring first byte */
94  chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
95 
96  /* If length mismatch use size from MOV file and try to decode anyway */
97  if (chunk_size != bytestream2_get_bytes_left(&s->gb) - 4)
98  av_log(s->avctx, AV_LOG_WARNING, "MOV chunk size != encoded chunk size\n");
99 
100  /* Number of 4x4 blocks in frame. */
101  total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
102 
103  /* Process chunk data */
104  while (bytestream2_get_bytes_left(&s->gb)) {
105  uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
106 
107  int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
108 
109  /* If opcode MSbit is 0, we need more data to decide what to do */
110  if ((opcode & 0x80) == 0) {
111  colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
112  opcode = 0;
113  if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
114  /* Must behave as opcode 110xxxxx, using colorA computed
115  * above. Use fake opcode 0x20 to enter switch block at
116  * the right place */
117  opcode = 0x20;
118  n_blocks = 1;
119  }
120  }
121 
122  n_blocks = FFMIN(n_blocks, total_blocks);
123 
124  switch (opcode & 0xe0) {
125 
126  /* Skip blocks */
127  case 0x80:
128  while (n_blocks--) {
129  ADVANCE_BLOCK();
130  }
131  break;
132 
133  /* Fill blocks with one color */
134  case 0xa0:
135  colorA = bytestream2_get_be16(&s->gb);
136  while (n_blocks--) {
137  block_ptr = row_ptr + pixel_ptr;
138  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
139  for (pixel_x = 0; pixel_x < 4; pixel_x++){
140  pixels[block_ptr] = colorA;
141  block_ptr++;
142  }
143  block_ptr += row_inc;
144  }
145  ADVANCE_BLOCK();
146  }
147  break;
148 
149  /* Fill blocks with 4 colors */
150  case 0xc0:
151  colorA = bytestream2_get_be16(&s->gb);
152  case 0x20:
153  colorB = bytestream2_get_be16(&s->gb);
154 
155  /* sort out the colors */
156  color4[0] = colorB;
157  color4[1] = 0;
158  color4[2] = 0;
159  color4[3] = colorA;
160 
161  /* red components */
162  ta = (colorA >> 10) & 0x1F;
163  tb = (colorB >> 10) & 0x1F;
164  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
165  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
166 
167  /* green components */
168  ta = (colorA >> 5) & 0x1F;
169  tb = (colorB >> 5) & 0x1F;
170  color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
171  color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
172 
173  /* blue components */
174  ta = colorA & 0x1F;
175  tb = colorB & 0x1F;
176  color4[1] |= ((11 * ta + 21 * tb) >> 5);
177  color4[2] |= ((21 * ta + 11 * tb) >> 5);
178 
179  if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
180  return;
181  while (n_blocks--) {
182  block_ptr = row_ptr + pixel_ptr;
183  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
184  uint8_t index = bytestream2_get_byteu(&s->gb);
185  for (pixel_x = 0; pixel_x < 4; pixel_x++){
186  uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
187  pixels[block_ptr] = color4[idx];
188  block_ptr++;
189  }
190  block_ptr += row_inc;
191  }
192  ADVANCE_BLOCK();
193  }
194  break;
195 
196  /* Fill block with 16 colors */
197  case 0x00:
198  if (bytestream2_get_bytes_left(&s->gb) < 30)
199  return;
200  block_ptr = row_ptr + pixel_ptr;
201  for (pixel_y = 0; pixel_y < 4; pixel_y++) {
202  for (pixel_x = 0; pixel_x < 4; pixel_x++){
203  /* We already have color of upper left pixel */
204  if ((pixel_y != 0) || (pixel_x != 0))
205  colorA = bytestream2_get_be16u(&s->gb);
206  pixels[block_ptr] = colorA;
207  block_ptr++;
208  }
209  block_ptr += row_inc;
210  }
211  ADVANCE_BLOCK();
212  break;
213 
214  /* Unknown opcode */
215  default:
216  av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
217  " Skip remaining %d bytes of chunk data.\n", opcode,
219  return;
220  } /* Opcode switch */
221  }
222 }
223 
225 {
226  RpzaContext *s = avctx->priv_data;
227 
228  s->avctx = avctx;
229  avctx->pix_fmt = AV_PIX_FMT_RGB555;
230 
231  s->frame = av_frame_alloc();
232  if (!s->frame)
233  return AVERROR(ENOMEM);
234 
235  return 0;
236 }
237 
239  void *data, int *got_frame,
240  AVPacket *avpkt)
241 {
242  RpzaContext *s = avctx->priv_data;
243  int ret;
244 
245  bytestream2_init(&s->gb, avpkt->data, avpkt->size);
246 
247  if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
248  av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
249  return ret;
250  }
251 
253 
254  if ((ret = av_frame_ref(data, s->frame)) < 0)
255  return ret;
256 
257  *got_frame = 1;
258 
259  /* always report that the buffer was completely consumed */
260  return avpkt->size;
261 }
262 
264 {
265  RpzaContext *s = avctx->priv_data;
266 
267  av_frame_free(&s->frame);
268 
269  return 0;
270 }
271 
273  .name = "rpza",
274  .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
275  .type = AVMEDIA_TYPE_VIDEO,
276  .id = AV_CODEC_ID_RPZA,
277  .priv_data_size = sizeof(RpzaContext),
281  .capabilities = CODEC_CAP_DR1,
282 };
static int rpza_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: rpza.c:238
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
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1254
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:130
int stride
Definition: mace.c:144
AVCodec.
Definition: avcodec.h:2796
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:57
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
static void rpza_decode_stream(RpzaContext *s)
Definition: rpza.c:71
uint8_t
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
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
AVCodec ff_rpza_decoder
Definition: rpza.c:272
#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
static av_cold int rpza_decode_end(AVCodecContext *avctx)
Definition: rpza.c:263
#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:150
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:149
Libavcodec 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...
Definition: utils.c:808
int width
picture width / height.
Definition: avcodec.h:1224
if(ac->has_optimized_func)
static av_cold int rpza_decode_init(AVCodecContext *avctx)
Definition: rpza.c:224
static int width
Definition: utils.c:156
#define av_cold
Definition: attributes.h:66
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:231
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
int index
Definition: gxfenc.c:72
uint8_t * data
Definition: avcodec.h:973
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
AVFrame * frame
Definition: rpza.c:50
void * priv_data
Definition: avcodec.h:1092
common internal api header.
AVCodecContext * avctx
Definition: rpza.c:49
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
#define ADVANCE_BLOCK()
Definition: rpza.c:55
This structure stores compressed data.
Definition: avcodec.h:950
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
#define FFMIN(a, b)
Definition: common.h:57