FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/rpza.c
Date: 2022-07-06 18:02:43
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 "codec_internal.h"
46 #include "internal.h"
47
48 typedef struct RpzaContext {
49
50 AVCodecContext *avctx;
51 AVFrame *frame;
52
53 GetByteContext gb;
54 } RpzaContext;
55
56 #define CHECK_BLOCK() \
57 if (total_blocks < 1) { \
58 av_log(s->avctx, AV_LOG_ERROR, \
59 "Block counter just went negative (this should not happen)\n"); \
60 return AVERROR_INVALIDDATA; \
61 } \
62
63 #define ADVANCE_BLOCK() \
64 { \
65 pixel_ptr += 4; \
66 if (pixel_ptr >= width) \
67 { \
68 pixel_ptr = 0; \
69 row_ptr += stride * 4; \
70 } \
71 total_blocks--; \
72 }
73
74 31 static int rpza_decode_stream(RpzaContext *s)
75 {
76 31 int width = s->avctx->width;
77 int stride, row_inc, ret;
78 int chunk_size;
79 31 uint16_t colorA = 0, colorB;
80 uint16_t color4[4];
81 uint16_t ta, tb;
82 uint16_t *pixels;
83
84 31 int row_ptr = 0;
85 31 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
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 31 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, ignoring first byte */
96 31 chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
97
98 /* If length mismatch use size from MOV file and try to decode anyway */
99
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 31 if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
100 ✗ av_log(s->avctx, AV_LOG_WARNING,
101 "MOV chunk size %d != encoded chunk size %d\n",
102 chunk_size,
103 ✗ bytestream2_get_bytes_left(&s->gb) + 4
104 );
105
106 /* Number of 4x4 blocks in frame. */
107 31 total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
108
109
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 31 if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
110 ✗ return AVERROR_INVALIDDATA;
111
112
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 31 if ((ret = ff_reget_buffer(s->avctx, s->frame, 0)) < 0)
113 ✗ return ret;
114 31 pixels = (uint16_t *)s->frame->data[0];
115 31 stride = s->frame->linesize[0] / 2;
116 31 row_inc = stride - 4;
117
118 /* Process chunk data */
119
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 60204 while (bytestream2_get_bytes_left(&s->gb)) {
120 60173 uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
121
122 60173 int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
123
124 /* If opcode MSbit is 0, we need more data to decide what to do */
125
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 60173 if ((opcode & 0x80) == 0) {
126 48161 colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
127 48161 opcode = 0;
128
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 48161 if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
129 /* Must behave as opcode 110xxxxx, using colorA computed
130 * above. Use fake opcode 0x20 to enter switch block at
131 * the right place */
132 48161 opcode = 0x20;
133 48161 n_blocks = 1;
134 }
135 }
136
137 60173 n_blocks = FFMIN(n_blocks, total_blocks);
138
139
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 60173 switch (opcode & 0xe0) {
140
141 /* Skip blocks */
142 10393 case 0x80:
143
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 108698 while (n_blocks--) {
144
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 98305 CHECK_BLOCK();
145
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 98305 ADVANCE_BLOCK();
146 }
147 10393 break;
148
149 /* Fill blocks with one color */
150 1619 case 0xa0:
151 1619 colorA = bytestream2_get_be16(&s->gb);
152
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 3953 while (n_blocks--) {
153
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 2334 CHECK_BLOCK();
154 2334 block_ptr = row_ptr + pixel_ptr;
155
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 11670 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
156
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 46680 for (pixel_x = 0; pixel_x < 4; pixel_x++){
157 37344 pixels[block_ptr] = colorA;
158 37344 block_ptr++;
159 }
160 9336 block_ptr += row_inc;
161 }
162
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 2334 ADVANCE_BLOCK();
163 }
164 1619 break;
165
166 /* Fill blocks with 4 colors */
167 ✗ case 0xc0:
168 ✗ colorA = bytestream2_get_be16(&s->gb);
169 48161 case 0x20:
170 48161 colorB = bytestream2_get_be16(&s->gb);
171
172 /* sort out the colors */
173 48161 color4[0] = colorB;
174 48161 color4[1] = 0;
175 48161 color4[2] = 0;
176 48161 color4[3] = colorA;
177
178 /* red components */
179 48161 ta = (colorA >> 10) & 0x1F;
180 48161 tb = (colorB >> 10) & 0x1F;
181 48161 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
182 48161 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
183
184 /* green components */
185 48161 ta = (colorA >> 5) & 0x1F;
186 48161 tb = (colorB >> 5) & 0x1F;
187 48161 color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
188 48161 color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
189
190 /* blue components */
191 48161 ta = colorA & 0x1F;
192 48161 tb = colorB & 0x1F;
193 48161 color4[1] |= ((11 * ta + 21 * tb) >> 5);
194 48161 color4[2] |= ((21 * ta + 11 * tb) >> 5);
195
196
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 48161 if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
197 ✗ return AVERROR_INVALIDDATA;
198
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 96322 while (n_blocks--) {
199
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 48161 CHECK_BLOCK();
200 48161 block_ptr = row_ptr + pixel_ptr;
201
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 240805 for (pixel_y = 0; pixel_y < 4; pixel_y++) {
202 192644 uint8_t index = bytestream2_get_byteu(&s->gb);
203
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 963220 for (pixel_x = 0; pixel_x < 4; pixel_x++){
204 770576 uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
205 770576 pixels[block_ptr] = color4[idx];
206 770576 block_ptr++;
207 }
208 192644 block_ptr += row_inc;
209 }
210
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 48161 ADVANCE_BLOCK();
211 }
212 48161 break;
213
214 /* Fill block with 16 colors */
215 ✗ case 0x00:
216 ✗ if (bytestream2_get_bytes_left(&s->gb) < 30)
217 ✗ return AVERROR_INVALIDDATA;
218 ✗ CHECK_BLOCK();
219 ✗ block_ptr = row_ptr + pixel_ptr;
220 ✗ for (pixel_y = 0; pixel_y < 4; pixel_y++) {
221 ✗ for (pixel_x = 0; pixel_x < 4; pixel_x++){
222 /* We already have color of upper left pixel */
223 ✗ if ((pixel_y != 0) || (pixel_x != 0))
224 ✗ colorA = bytestream2_get_be16u(&s->gb);
225 ✗ pixels[block_ptr] = colorA;
226 ✗ block_ptr++;
227 }
228 ✗ block_ptr += row_inc;
229 }
230 ✗ ADVANCE_BLOCK();
231 ✗ break;
232
233 /* Unknown opcode */
234 ✗ default:
235 ✗ av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
236 " Skip remaining %d bytes of chunk data.\n", opcode,
237 bytestream2_get_bytes_left(&s->gb));
238 ✗ return AVERROR_INVALIDDATA;
239 } /* Opcode switch */
240 }
241
242 31 return 0;
243 }
244
245 2 static av_cold int rpza_decode_init(AVCodecContext *avctx)
246 {
247 2 RpzaContext *s = avctx->priv_data;
248
249 2 s->avctx = avctx;
250 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
251
252 2 s->frame = av_frame_alloc();
253
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 2 if (!s->frame)
254 ✗ return AVERROR(ENOMEM);
255
256 2 return 0;
257 }
258
259 31 static int rpza_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
260 int *got_frame, 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(rframe, 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 FFCodec ff_rpza_decoder = {
290 .p.name = "rpza",
291 .p.long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
292 .p.type = AVMEDIA_TYPE_VIDEO,
293 .p.id = AV_CODEC_ID_RPZA,
294 .priv_data_size = sizeof(RpzaContext),
295 .init = rpza_decode_init,
296 .close = rpza_decode_end,
297 FF_CODEC_DECODE_CB(rpza_decode_frame),
298 .p.capabilities = AV_CODEC_CAP_DR1,
299 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
300 };
301