FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eamad.c
Date: 2022-12-09 07:38:14
Exec Total Coverage
Lines: 150 178 84.3%
Functions: 10 10 100.0%
Branches: 66 88 75.0%

Line Branch Exec Source
1 /*
2 * Electronic Arts Madcow Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross
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 St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Electronic Arts Madcow Video Decoder
25 * @author Peter Ross <pross@xvid.org>
26 *
27 * @see technical details at
28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
29 */
30
31 #include "libavutil/mem_internal.h"
32
33 #include "avcodec.h"
34 #include "blockdsp.h"
35 #include "bytestream.h"
36 #include "bswapdsp.h"
37 #include "codec_internal.h"
38 #include "decode.h"
39 #include "get_bits.h"
40 #include "aandcttab.h"
41 #include "eaidct.h"
42 #include "mpeg12data.h"
43 #include "mpeg12vlc.h"
44
45 #define EA_PREAMBLE_SIZE 8
46 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
47 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
48 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
49
50 typedef struct MadContext {
51 AVCodecContext *avctx;
52 BlockDSPContext bdsp;
53 BswapDSPContext bbdsp;
54 AVFrame *last_frame;
55 GetBitContext gb;
56 void *bitstream_buf;
57 unsigned int bitstream_buf_size;
58 DECLARE_ALIGNED(32, int16_t, block)[64];
59 uint16_t quant_matrix[64];
60 int mb_x;
61 int mb_y;
62 } MadContext;
63
64 4 static av_cold int decode_init(AVCodecContext *avctx)
65 {
66 4 MadContext *s = avctx->priv_data;
67 4 s->avctx = avctx;
68 4 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
69 4 ff_blockdsp_init(&s->bdsp);
70 4 ff_bswapdsp_init(&s->bbdsp);
71 4 ff_mpeg12_init_vlcs();
72
73 4 s->last_frame = av_frame_alloc();
74
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4 if (!s->last_frame)
75 return AVERROR(ENOMEM);
76
77 4 return 0;
78 }
79
80 665174 static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
81 unsigned char *src, ptrdiff_t src_stride, int add)
82 {
83 int j, i;
84
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85
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47892528 for (i=0; i<8; i++)
86 42571136 dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
87 665174 }
88
89 665174 static inline void comp_block(MadContext *t, AVFrame *frame,
90 int mb_x, int mb_y,
91 int j, int mv_x, int mv_y, int add)
92 {
93
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665174 if (j < 4) {
94 437978 unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
95
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437978 if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
96 return;
97 437978 comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
98 437978 frame->linesize[0],
99 437978 t->last_frame->data[0] + offset,
100 437978 t->last_frame->linesize[0], add);
101
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227196 } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
102 227196 int index = j - 3;
103 227196 unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
104
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227196 if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
105 return;
106 227196 comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
107 227196 frame->linesize[index],
108 227196 t->last_frame->data[index] + offset,
109 227196 t->last_frame->linesize[index], add);
110 }
111 }
112
113 158158 static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
114 int mb_x, int mb_y, int j)
115 {
116
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158158 if (j < 4) {
117 110910 ff_ea_idct_put_c(
118 110910 frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
119 110910 frame->linesize[0], block);
120
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47248 } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
121 47248 int index = j - 3;
122 47248 ff_ea_idct_put_c(
123 47248 frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
124 47248 frame->linesize[index], block);
125 }
126 158158 }
127
128 158158 static inline int decode_block_intra(MadContext *s, int16_t * block)
129 {
130 int level, i, j, run;
131 158158 const uint8_t *scantable = ff_zigzag_direct;
132 158158 int16_t *quant_matrix = s->quant_matrix;
133
134 158158 block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
135
136 /* The RL decoder is derived from mpeg1_decode_block_intra;
137 Escaped level and run values a decoded differently */
138 158158 i = 0;
139 {
140 158158 OPEN_READER(re, &s->gb);
141 /* now quantify & encode AC coefficients */
142 for (;;) {
143 1112218 UPDATE_CACHE(re, &s->gb);
144
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1112218 GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0);
145
146
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1112218 if (level == 127) {
147 158158 break;
148
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954060 } else if (level != 0) {
149 913987 i += run;
150
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913987 if (i > 63) {
151 av_log(s->avctx, AV_LOG_ERROR,
152 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
153 return -1;
154 }
155 913987 j = scantable[i];
156 913987 level = (level*quant_matrix[j]) >> 4;
157 913987 level = (level-1)|1;
158 913987 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
159 913987 LAST_SKIP_BITS(re, &s->gb, 1);
160 } else {
161 /* escape */
162 40073 UPDATE_CACHE(re, &s->gb);
163 40073 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
164
165 40073 UPDATE_CACHE(re, &s->gb);
166 40073 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
167
168 40073 i += run;
169
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40073 if (i > 63) {
170 av_log(s->avctx, AV_LOG_ERROR,
171 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
172 return -1;
173 }
174 40073 j = scantable[i];
175
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40073 if (level < 0) {
176 20920 level = -level;
177 20920 level = (level*quant_matrix[j]) >> 4;
178 20920 level = (level-1)|1;
179 20920 level = -level;
180 } else {
181 19153 level = (level*quant_matrix[j]) >> 4;
182 19153 level = (level-1)|1;
183 }
184 }
185
186 954060 block[j] = level;
187 }
188 158158 CLOSE_READER(re, &s->gb);
189 }
190 158158 return 0;
191 }
192
193 897656 static int decode_motion(GetBitContext *gb)
194 {
195 897656 int value = 0;
196
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897656 if (get_bits1(gb)) {
197
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300433 if (get_bits1(gb))
198 163614 value = -17;
199 300433 value += get_bits(gb, 4) + 1;
200 }
201 897656 return value;
202 }
203
204 137222 static int decode_mb(MadContext *s, AVFrame *frame, int inter)
205 {
206 137222 int mv_map = 0;
207 137222 int av_uninit(mv_x), av_uninit(mv_y);
208 int j;
209
210
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137222 if (inter) {
211 119970 int v = decode210(&s->gb);
212
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119970 if (v < 2) {
213
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116241 mv_map = v ? get_bits(&s->gb, 6) : 63;
214 116241 mv_x = decode_motion(&s->gb);
215 116241 mv_y = decode_motion(&s->gb);
216 }
217 }
218
219
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960554 for (j=0; j<6; j++) {
220
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823332 if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
221 665174 int add = 2*decode_motion(&s->gb);
222
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665174 if (s->last_frame->data[0])
223 665174 comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
224 } else {
225 158158 s->bdsp.clear_block(s->block);
226
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158158 if(decode_block_intra(s, s->block) < 0)
227 return -1;
228 158158 idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
229 }
230 }
231 137222 return 0;
232 }
233
234 99 static void calc_quant_matrix(MadContext *s, int qscale)
235 {
236 int i;
237
238 99 s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
239
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6336 for (i=1; i<64; i++)
240 6237 s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
241 99 }
242
243 99 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
244 int *got_frame, AVPacket *avpkt)
245 {
246 99 const uint8_t *buf = avpkt->data;
247 99 int buf_size = avpkt->size;
248 99 MadContext *s = avctx->priv_data;
249 GetByteContext gb;
250 int width, height;
251 int chunk_type;
252 int inter, ret;
253
254 99 bytestream2_init(&gb, buf, buf_size);
255
256 99 chunk_type = bytestream2_get_le32(&gb);
257
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99 inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
258 99 bytestream2_skip(&gb, 10);
259
260 99 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
261 99 bytestream2_get_le16(&gb), 1000, 1<<30);
262
263 99 width = bytestream2_get_le16(&gb);
264 99 height = bytestream2_get_le16(&gb);
265 99 bytestream2_skip(&gb, 1);
266 99 calc_quant_matrix(s, bytestream2_get_byte(&gb));
267 99 bytestream2_skip(&gb, 2);
268
269
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99 if (bytestream2_get_bytes_left(&gb) < 2) {
270 av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
271 return AVERROR_INVALIDDATA;
272 }
273
274
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99 if (width < 16 || height < 16) {
275 av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
276 return AVERROR_INVALIDDATA;
277 }
278
279
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99 if (avctx->width != width || avctx->height != height) {
280 3 av_frame_unref(s->last_frame);
281
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3 if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
282 return AVERROR_INVALIDDATA;
283
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3 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
284 return ret;
285 }
286
287
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99 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
288 return ret;
289
290
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99 if (inter && !s->last_frame->data[0]) {
291 av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
292 ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
293 if (ret < 0)
294 return ret;
295 memset(s->last_frame->data[0], 0, s->last_frame->height *
296 s->last_frame->linesize[0]);
297 memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
298 s->last_frame->linesize[1]);
299 memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
300 s->last_frame->linesize[2]);
301 }
302
303 99 av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
304 99 bytestream2_get_bytes_left(&gb));
305
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99 if (!s->bitstream_buf)
306 return AVERROR(ENOMEM);
307 99 s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
308 99 bytestream2_get_bytes_left(&gb) / 2);
309 99 memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
310 99 init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
311
312
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3153 for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
313
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140276 for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
314
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137222 if(decode_mb(s, frame, inter) < 0)
315 return AVERROR_INVALIDDATA;
316
317 99 *got_frame = 1;
318
319
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99 if (chunk_type != MADe_TAG) {
320 51 av_frame_unref(s->last_frame);
321
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51 if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
322 return ret;
323 }
324
325 99 return buf_size;
326 }
327
328 4 static av_cold int decode_end(AVCodecContext *avctx)
329 {
330 4 MadContext *t = avctx->priv_data;
331 4 av_frame_free(&t->last_frame);
332 4 av_freep(&t->bitstream_buf);
333 4 return 0;
334 }
335
336 const FFCodec ff_eamad_decoder = {
337 .p.name = "eamad",
338 CODEC_LONG_NAME("Electronic Arts Madcow Video"),
339 .p.type = AVMEDIA_TYPE_VIDEO,
340 .p.id = AV_CODEC_ID_MAD,
341 .priv_data_size = sizeof(MadContext),
342 .init = decode_init,
343 .close = decode_end,
344 FF_CODEC_DECODE_CB(decode_frame),
345 .p.capabilities = AV_CODEC_CAP_DR1,
346 };
347