FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/eamad.c
Date: 2024-05-26 22:00:00
Exec Total Coverage
Lines: 149 177 84.2%
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.h"
32 #include "libavutil/mem_internal.h"
33
34 #include "avcodec.h"
35 #include "blockdsp.h"
36 #include "bytestream.h"
37 #include "bswapdsp.h"
38 #include "codec_internal.h"
39 #include "decode.h"
40 #include "get_bits.h"
41 #include "aandcttab.h"
42 #include "eaidct.h"
43 #include "mpeg12data.h"
44 #include "mpeg12vlc.h"
45
46 #define EA_PREAMBLE_SIZE 8
47 #define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
48 #define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
49 #define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
50
51 typedef struct MadContext {
52 AVCodecContext *avctx;
53 BlockDSPContext bdsp;
54 BswapDSPContext bbdsp;
55 AVFrame *last_frame;
56 GetBitContext gb;
57 void *bitstream_buf;
58 unsigned int bitstream_buf_size;
59 DECLARE_ALIGNED(32, int16_t, block)[64];
60 uint16_t quant_matrix[64];
61 int mb_x;
62 int mb_y;
63 } MadContext;
64
65 4 static av_cold int decode_init(AVCodecContext *avctx)
66 {
67 4 MadContext *s = avctx->priv_data;
68 4 s->avctx = avctx;
69 4 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
70 4 ff_blockdsp_init(&s->bdsp);
71 4 ff_bswapdsp_init(&s->bbdsp);
72 4 ff_mpeg12_init_vlcs();
73
74 4 s->last_frame = av_frame_alloc();
75
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4 if (!s->last_frame)
76 return AVERROR(ENOMEM);
77
78 4 return 0;
79 }
80
81 665174 static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
82 unsigned char *src, ptrdiff_t src_stride, int add)
83 {
84 int j, i;
85
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5986566 for (j=0; j<8; j++)
86
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47892528 for (i=0; i<8; i++)
87 42571136 dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
88 665174 }
89
90 665174 static inline void comp_block(MadContext *t, AVFrame *frame,
91 int mb_x, int mb_y,
92 int j, int mv_x, int mv_y, int add)
93 {
94
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665174 if (j < 4) {
95 437978 unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
96
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437978 if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
97 return;
98 437978 comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
99 437978 frame->linesize[0],
100 437978 t->last_frame->data[0] + offset,
101 437978 t->last_frame->linesize[0], add);
102
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227196 } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
103 227196 int index = j - 3;
104 227196 unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
105
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227196 if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
106 return;
107 227196 comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
108 227196 frame->linesize[index],
109 227196 t->last_frame->data[index] + offset,
110 227196 t->last_frame->linesize[index], add);
111 }
112 }
113
114 158158 static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
115 int mb_x, int mb_y, int j)
116 {
117
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158158 if (j < 4) {
118 110910 ff_ea_idct_put_c(
119 110910 frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
120 110910 frame->linesize[0], block);
121
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47248 } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
122 47248 int index = j - 3;
123 47248 ff_ea_idct_put_c(
124 47248 frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
125 47248 frame->linesize[index], block);
126 }
127 158158 }
128
129 158158 static inline int decode_block_intra(MadContext *s, int16_t * block)
130 {
131 int level, i, j, run;
132 158158 const uint8_t *scantable = ff_zigzag_direct;
133 158158 int16_t *quant_matrix = s->quant_matrix;
134
135 158158 block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
136
137 /* The RL decoder is derived from mpeg1_decode_block_intra;
138 Escaped level and run values a decoded differently */
139 158158 i = 0;
140 {
141 158158 OPEN_READER(re, &s->gb);
142 /* now quantify & encode AC coefficients */
143 for (;;) {
144 2066278 UPDATE_CACHE(re, &s->gb);
145
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1112218 GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0);
146
147
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1112218 if (level == 127) {
148 158158 break;
149
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954060 } else if (level != 0) {
150 913987 i += run;
151
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913987 if (i > 63) {
152 av_log(s->avctx, AV_LOG_ERROR,
153 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
154 return -1;
155 }
156 913987 j = scantable[i];
157 913987 level = (level*quant_matrix[j]) >> 4;
158 913987 level = (level-1)|1;
159 913987 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
160 913987 LAST_SKIP_BITS(re, &s->gb, 1);
161 } else {
162 /* escape */
163 40073 UPDATE_CACHE(re, &s->gb);
164 40073 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
165
166 40073 UPDATE_CACHE(re, &s->gb);
167 40073 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
168
169 40073 i += run;
170
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40073 if (i > 63) {
171 av_log(s->avctx, AV_LOG_ERROR,
172 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
173 return -1;
174 }
175 40073 j = scantable[i];
176
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40073 if (level < 0) {
177 20920 level = -level;
178 20920 level = (level*quant_matrix[j]) >> 4;
179 20920 level = (level-1)|1;
180 20920 level = -level;
181 } else {
182 19153 level = (level*quant_matrix[j]) >> 4;
183 19153 level = (level-1)|1;
184 }
185 }
186
187 954060 block[j] = level;
188 }
189 158158 CLOSE_READER(re, &s->gb);
190 }
191 158158 return 0;
192 }
193
194 897656 static int decode_motion(GetBitContext *gb)
195 {
196 897656 int value = 0;
197
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897656 if (get_bits1(gb)) {
198
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300433 if (get_bits1(gb))
199 163614 value = -17;
200 300433 value += get_bits(gb, 4) + 1;
201 }
202 897656 return value;
203 }
204
205 137222 static int decode_mb(MadContext *s, AVFrame *frame, int inter)
206 {
207 137222 int mv_map = 0;
208 137222 int av_uninit(mv_x), av_uninit(mv_y);
209 int j;
210
211
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137222 if (inter) {
212 119970 int v = decode210(&s->gb);
213
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119970 if (v < 2) {
214
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116241 mv_map = v ? get_bits(&s->gb, 6) : 63;
215 116241 mv_x = decode_motion(&s->gb);
216 116241 mv_y = decode_motion(&s->gb);
217 }
218 }
219
220
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960554 for (j=0; j<6; j++) {
221
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823332 if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
222 665174 int add = 2*decode_motion(&s->gb);
223
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665174 if (s->last_frame->data[0])
224 665174 comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
225 } else {
226 158158 s->bdsp.clear_block(s->block);
227
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158158 if(decode_block_intra(s, s->block) < 0)
228 return -1;
229 158158 idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
230 }
231 }
232 137222 return 0;
233 }
234
235 99 static void calc_quant_matrix(MadContext *s, int qscale)
236 {
237 int i;
238
239 99 s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
240
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6336 for (i=1; i<64; i++)
241 6237 s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
242 99 }
243
244 99 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
245 int *got_frame, AVPacket *avpkt)
246 {
247 99 const uint8_t *buf = avpkt->data;
248 99 int buf_size = avpkt->size;
249 99 MadContext *s = avctx->priv_data;
250 GetByteContext gb;
251 int width, height;
252 int chunk_type;
253 int inter, ret;
254
255 99 bytestream2_init(&gb, buf, buf_size);
256
257 99 chunk_type = bytestream2_get_le32(&gb);
258
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99 inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
259 99 bytestream2_skip(&gb, 10);
260
261 99 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
262 99 bytestream2_get_le16(&gb), 1000, 1<<30);
263
264 99 width = bytestream2_get_le16(&gb);
265 99 height = bytestream2_get_le16(&gb);
266 99 bytestream2_skip(&gb, 1);
267 99 calc_quant_matrix(s, bytestream2_get_byte(&gb));
268 99 bytestream2_skip(&gb, 2);
269
270
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99 if (bytestream2_get_bytes_left(&gb) < 2) {
271 av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
272 return AVERROR_INVALIDDATA;
273 }
274
275
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99 if (width < 16 || height < 16) {
276 av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
277 return AVERROR_INVALIDDATA;
278 }
279
280
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99 if (avctx->width != width || avctx->height != height) {
281 3 av_frame_unref(s->last_frame);
282
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3 if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
283 return AVERROR_INVALIDDATA;
284
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3 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
285 return ret;
286 }
287
288
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99 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
289 return ret;
290
291
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99 if (inter && !s->last_frame->data[0]) {
292 av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
293 ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
294 if (ret < 0)
295 return ret;
296 memset(s->last_frame->data[0], 0, s->last_frame->height *
297 s->last_frame->linesize[0]);
298 memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
299 s->last_frame->linesize[1]);
300 memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
301 s->last_frame->linesize[2]);
302 }
303
304 99 av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
305 99 bytestream2_get_bytes_left(&gb));
306
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99 if (!s->bitstream_buf)
307 return AVERROR(ENOMEM);
308 99 s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
309 99 bytestream2_get_bytes_left(&gb) / 2);
310 99 memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
311 99 init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
312
313
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3153 for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
314
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140276 for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
315
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137222 if(decode_mb(s, frame, inter) < 0)
316 return AVERROR_INVALIDDATA;
317
318 99 *got_frame = 1;
319
320
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99 if (chunk_type != MADe_TAG) {
321
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51 if ((ret = av_frame_replace(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