FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/rpza.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 93 121 76.9%
Branches: 39 68 57.4%

Line Branch Exec Source
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 <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
49 AVCodecContext *avctx;
50 AVFrame *frame;
51
52 GetByteContext gb;
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
73 31 static int rpza_decode_stream(RpzaContext *s)
74 {
75 31 int width = s->avctx->width;
76 int stride, row_inc, ret;
77 int chunk_size;
78 31 uint16_t colorA = 0, colorB;
79 uint16_t color4[4];
80 uint16_t ta, tb;
81 uint16_t *pixels;
82
83 31 int row_ptr = 0;
84 31 int pixel_ptr = 0;
85 int block_ptr;
86 int pixel_x, pixel_y;
87 int total_blocks;
88
89 /* First byte is always 0xe1. Warn if it's different */
90
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31 if (bytestream2_peek_byte(&s->gb) != 0xe1)
91 av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
92 bytestream2_peek_byte(&s->gb));
93
94 /* Get chunk size, ignoring first byte */
95 31 chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
96
97 /* If length mismatch use size from MOV file and try to decode anyway */
98
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31 if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
99 av_log(s->avctx, AV_LOG_WARNING,
100 "MOV chunk size %d != encoded chunk size %d\n",
101 chunk_size,
102 bytestream2_get_bytes_left(&s->gb) + 4
103 );
104
105 /* Number of 4x4 blocks in frame. */
106 31 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
107
108
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31 if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
109 return AVERROR_INVALIDDATA;
110
111
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31 if ((ret = ff_reget_buffer(s->avctx, s->frame, 0)) < 0)
112 return ret;
113 31 pixels = (uint16_t *)s->frame->data[0];
114 31 stride = s->frame->linesize[0] / 2;
115 31 row_inc = stride - 4;
116
117 /* Process chunk data */
118
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60204 while (bytestream2_get_bytes_left(&s->gb)) {
119 60173 uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
120
121 60173 int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
122
123 /* If opcode MSbit is 0, we need more data to decide what to do */
124
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60173 if ((opcode & 0x80) == 0) {
125 48161 colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
126 48161 opcode = 0;
127
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48161 if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
128 /* Must behave as opcode 110xxxxx, using colorA computed
129 * above. Use fake opcode 0x20 to enter switch block at
130 * the right place */
131 48161 opcode = 0x20;
132 48161 n_blocks = 1;
133 }
134 }
135
136 60173 n_blocks = FFMIN(n_blocks, total_blocks);
137
138
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60173 switch (opcode & 0xe0) {
139
140 /* Skip blocks */
141 10393 case 0x80:
142
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108698 while (n_blocks--) {
143
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98305 CHECK_BLOCK();
144
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98305 ADVANCE_BLOCK();
145 }
146 10393 break;
147
148 /* Fill blocks with one color */
149 1619 case 0xa0:
150 1619 colorA = bytestream2_get_be16(&s->gb);
151
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3953 while (n_blocks--) {
152
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2334 CHECK_BLOCK();
153 2334 block_ptr = row_ptr + pixel_ptr;
154
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11670 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
155
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46680 for (pixel_x = 0; pixel_x < 4; pixel_x++){
156 37344 pixels[block_ptr] = colorA;
157 37344 block_ptr++;
158 }
159 9336 block_ptr += row_inc;
160 }
161
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2334 ADVANCE_BLOCK();
162 }
163 1619 break;
164
165 /* Fill blocks with 4 colors */
166 case 0xc0:
167 colorA = bytestream2_get_be16(&s->gb);
168 48161 case 0x20:
169 48161 colorB = bytestream2_get_be16(&s->gb);
170
171 /* sort out the colors */
172 48161 color4[0] = colorB;
173 48161 color4[1] = 0;
174 48161 color4[2] = 0;
175 48161 color4[3] = colorA;
176
177 /* red components */
178 48161 ta = (colorA >> 10) & 0x1F;
179 48161 tb = (colorB >> 10) & 0x1F;
180 48161 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
181 48161 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
182
183 /* green components */
184 48161 ta = (colorA >> 5) & 0x1F;
185 48161 tb = (colorB >> 5) & 0x1F;
186 48161 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
187 48161 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
188
189 /* blue components */
190 48161 ta = colorA & 0x1F;
191 48161 tb = colorB & 0x1F;
192 48161 color4[1] |= ((11 * ta + 21 * tb) >> 5);
193 48161 color4[2] |= ((21 * ta + 11 * tb) >> 5);
194
195
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48161 if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
196 return AVERROR_INVALIDDATA;
197
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96322 while (n_blocks--) {
198
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48161 CHECK_BLOCK();
199 48161 block_ptr = row_ptr + pixel_ptr;
200
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240805 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
201 192644 uint8_t index = bytestream2_get_byteu(&s->gb);
202
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963220 for (pixel_x = 0; pixel_x < 4; pixel_x++){
203 770576 uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
204 770576 pixels[block_ptr] = color4[idx];
205 770576 block_ptr++;
206 }
207 192644 block_ptr += row_inc;
208 }
209
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48161 ADVANCE_BLOCK();
210 }
211 48161 break;
212
213 /* Fill block with 16 colors */
214 case 0x00:
215 if (bytestream2_get_bytes_left(&s->gb) < 30)
216 return AVERROR_INVALIDDATA;
217 CHECK_BLOCK();
218 block_ptr = row_ptr + pixel_ptr;
219 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
220 for (pixel_x = 0; pixel_x < 4; pixel_x++){
221 /* We already have color of upper left pixel */
222 if ((pixel_y != 0) || (pixel_x != 0))
223 colorA = bytestream2_get_be16u(&s->gb);
224 pixels[block_ptr] = colorA;
225 block_ptr++;
226 }
227 block_ptr += row_inc;
228 }
229 ADVANCE_BLOCK();
230 break;
231
232 /* Unknown opcode */
233 default:
234 av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
235 " Skip remaining %d bytes of chunk data.\n", opcode,
236 bytestream2_get_bytes_left(&s->gb));
237 return AVERROR_INVALIDDATA;
238 } /* Opcode switch */
239 }
240
241 31 return 0;
242 }
243
244 2 static av_cold int rpza_decode_init(AVCodecContext *avctx)
245 {
246 2 RpzaContext *s = avctx->priv_data;
247
248 2 s->avctx = avctx;
249 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
250
251 2 s->frame = av_frame_alloc();
252
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2 if (!s->frame)
253 return AVERROR(ENOMEM);
254
255 2 return 0;
256 }
257
258 31 static int rpza_decode_frame(AVCodecContext *avctx,
259 void *data, int *got_frame,
260 AVPacket *avpkt)
261 {
262 31 RpzaContext *s = avctx->priv_data;
263 int ret;
264
265 31 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
266
267 31 ret = rpza_decode_stream(s);
268
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31 if (ret < 0)
269 return ret;
270
271
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31 if ((ret = av_frame_ref(data, s->frame)) < 0)
272 return ret;
273
274 31 *got_frame = 1;
275
276 /* always report that the buffer was completely consumed */
277 31 return avpkt->size;
278 }
279
280 2 static av_cold int rpza_decode_end(AVCodecContext *avctx)
281 {
282 2 RpzaContext *s = avctx->priv_data;
283
284 2 av_frame_free(&s->frame);
285
286 2 return 0;
287 }
288
289 const AVCodec ff_rpza_decoder = {
290 .name = "rpza",
291 .long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
292 .type = AVMEDIA_TYPE_VIDEO,
293 .id = AV_CODEC_ID_RPZA,
294 .priv_data_size = sizeof(RpzaContext),
295 .init = rpza_decode_init,
296 .close = rpza_decode_end,
297 .decode = rpza_decode_frame,
298 .capabilities = AV_CODEC_CAP_DR1,
299 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
300 };
301