FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mdec.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 109 115 94.8%
Branches: 30 36 83.3%

Line Branch Exec Source
1 /*
2 * Sony PlayStation MDEC (Motion DECoder)
3 * Copyright (c) 2003 Michael Niedermayer
4 *
5 * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /**
25 * @file
26 * Sony PlayStation MDEC (Motion DECoder)
27 * This is very similar to intra-only MPEG-1.
28 */
29
30 #include "libavutil/mem_internal.h"
31
32 #include "avcodec.h"
33 #include "blockdsp.h"
34 #include "bswapdsp.h"
35 #include "idctdsp.h"
36 #include "mpeg12.h"
37 #include "thread.h"
38
39 typedef struct MDECContext {
40 AVCodecContext *avctx;
41 BlockDSPContext bdsp;
42 BswapDSPContext bbdsp;
43 IDCTDSPContext idsp;
44 ThreadFrame frame;
45 GetBitContext gb;
46 ScanTable scantable;
47 int version;
48 int qscale;
49 int last_dc[3];
50 int mb_width;
51 int mb_height;
52 int mb_x, mb_y;
53 DECLARE_ALIGNED(32, int16_t, block)[6][64];
54 DECLARE_ALIGNED(16, uint16_t, quant_matrix)[64];
55 uint8_t *bitstream_buffer;
56 unsigned int bitstream_buffer_size;
57 int block_last_index[6];
58 } MDECContext;
59
60 //very similar to MPEG-1
61 285689 static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
62 {
63 int level, diff, i, j, run;
64 int component;
65 285689 RLTable *rl = &ff_rl_mpeg1;
66 285689 uint8_t * const scantable = a->scantable.permutated;
67 285689 const uint16_t *quant_matrix = a->quant_matrix;
68 285689 const int qscale = a->qscale;
69
70 /* DC coefficient */
71
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285689 if (a->version == 2) {
72 214889 block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
73 } else {
74 70800 component = (n <= 3 ? 0 : n - 4 + 1);
75 70800 diff = decode_dc(&a->gb, component);
76 70800 a->last_dc[component] += diff;
77 70800 block[0] = a->last_dc[component] * (1 << 3);
78 }
79
80 285689 i = 0;
81 {
82 285689 OPEN_READER(re, &a->gb);
83 /* now quantify & encode AC coefficients */
84 for (;;) {
85 2462289 UPDATE_CACHE(re, &a->gb);
86
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2462289 GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
87
88
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2462289 if (level == 127) {
89 285688 break;
90
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2176601 } else if (level != 0) {
91 2133703 i += run;
92
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2133703 if (i > 63) {
93 1 av_log(a->avctx, AV_LOG_ERROR,
94 "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
95 1 return AVERROR_INVALIDDATA;
96 }
97 2133702 j = scantable[i];
98 2133702 level = (level * qscale * quant_matrix[j]) >> 3;
99 2133702 level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
100 2133702 LAST_SKIP_BITS(re, &a->gb, 1);
101 } else {
102 /* escape */
103 42898 run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
104 42898 UPDATE_CACHE(re, &a->gb);
105 42898 level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
106 42898 i += run;
107
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42898 if (i > 63) {
108 av_log(a->avctx, AV_LOG_ERROR,
109 "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
110 return AVERROR_INVALIDDATA;
111 }
112 42898 j = scantable[i];
113
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42898 if (level < 0) {
114 24818 level = -level;
115 24818 level = (level * (unsigned)qscale * quant_matrix[j]) >> 3;
116 24818 level = (level - 1) | 1;
117 24818 level = -level;
118 } else {
119 18080 level = (level * (unsigned)qscale * quant_matrix[j]) >> 3;
120 18080 level = (level - 1) | 1;
121 }
122 }
123
124 2176600 block[j] = level;
125 }
126 285688 CLOSE_READER(re, &a->gb);
127 }
128 285688 a->block_last_index[n] = i;
129 285688 return 0;
130 }
131
132 47615 static inline int decode_mb(MDECContext *a, int16_t block[6][64])
133 {
134 int i, ret;
135 static const int block_index[6] = { 5, 4, 0, 1, 2, 3 };
136
137 47615 a->bdsp.clear_blocks(block[0]);
138
139
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333303 for (i = 0; i < 6; i++) {
140
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285689 if ((ret = mdec_decode_block_intra(a, block[block_index[i]],
141 285689 block_index[i])) < 0)
142 1 return ret;
143
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285688 if (get_bits_left(&a->gb) < 0)
144 return AVERROR_INVALIDDATA;
145 }
146 47614 return 0;
147 }
148
149 47614 static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y)
150 {
151 47614 int16_t (*block)[64] = a->block;
152 47614 int linesize = frame->linesize[0];
153
154 47614 uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
155 47614 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
156 47614 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
157
158 47614 a->idsp.idct_put(dest_y, linesize, block[0]);
159 47614 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
160 47614 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
161 47614 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
162
163
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47614 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
164 47614 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
165 47614 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
166 }
167 47614 }
168
169 194 static int decode_frame(AVCodecContext *avctx,
170 void *data, int *got_frame,
171 AVPacket *avpkt)
172 {
173 194 MDECContext * const a = avctx->priv_data;
174 194 const uint8_t *buf = avpkt->data;
175 194 int buf_size = avpkt->size;
176 194 ThreadFrame frame = { .f = data };
177 int ret;
178
179
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194 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
180 return ret;
181 194 frame.f->pict_type = AV_PICTURE_TYPE_I;
182 194 frame.f->key_frame = 1;
183
184 194 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size);
185
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194 if (!a->bitstream_buffer)
186 return AVERROR(ENOMEM);
187 194 a->bbdsp.bswap16_buf((uint16_t *)a->bitstream_buffer, (uint16_t *)buf, (buf_size + 1) / 2);
188
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194 if ((ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size)) < 0)
189 return ret;
190
191 /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
192 194 skip_bits(&a->gb, 32);
193
194 194 a->qscale = get_bits(&a->gb, 16);
195 194 a->version = get_bits(&a->gb, 16);
196
197 194 a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128;
198
199
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3932 for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) {
200
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51353 for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) {
201
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47615 if ((ret = decode_mb(a, a->block)) < 0)
202 1 return ret;
203
204 47614 idct_put(a, frame.f, a->mb_x, a->mb_y);
205 }
206 }
207
208 193 *got_frame = 1;
209
210 193 return (get_bits_count(&a->gb) + 31) / 32 * 4;
211 }
212
213 7 static av_cold int decode_init(AVCodecContext *avctx)
214 {
215 7 MDECContext * const a = avctx->priv_data;
216 int i;
217
218 7 a->mb_width = (avctx->coded_width + 15) / 16;
219 7 a->mb_height = (avctx->coded_height + 15) / 16;
220
221 7 a->avctx = avctx;
222
223 7 ff_blockdsp_init(&a->bdsp, avctx);
224 7 ff_bswapdsp_init(&a->bbdsp);
225 7 ff_idctdsp_init(&a->idsp, avctx);
226 7 ff_mpeg12_init_vlcs();
227 7 ff_init_scantable(a->idsp.idct_permutation, &a->scantable,
228 ff_zigzag_direct);
229
230 7 avctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
231 7 avctx->color_range = AVCOL_RANGE_JPEG;
232
233 /* init q matrix */
234
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455 for (i = 0; i < 64; i++) {
235 448 int j = a->idsp.idct_permutation[i];
236
237 448 a->quant_matrix[j] = ff_mpeg1_default_intra_matrix[i];
238 }
239
240 7 return 0;
241 }
242
243 7 static av_cold int decode_end(AVCodecContext *avctx)
244 {
245 7 MDECContext * const a = avctx->priv_data;
246
247 7 av_freep(&a->bitstream_buffer);
248 7 a->bitstream_buffer_size = 0;
249
250 7 return 0;
251 }
252
253 const AVCodec ff_mdec_decoder = {
254 .name = "mdec",
255 .long_name = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),
256 .type = AVMEDIA_TYPE_VIDEO,
257 .id = AV_CODEC_ID_MDEC,
258 .priv_data_size = sizeof(MDECContext),
259 .init = decode_init,
260 .close = decode_end,
261 .decode = decode_frame,
262 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
263 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
264 };
265