eamad: Use the correct headers
[libav.git] / libavcodec / eamad.c
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1/*
2 * Electronic Arts Madcow Video Decoder
3 * Copyright (c) 2007-2009 Peter Ross
4 *
2912e87a 5 * This file is part of Libav.
c63ea92b 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
c63ea92b 24 * Electronic Arts Madcow Video Decoder
e873c03a 25 * @author Peter Ross <pross@xvid.org>
c63ea92b 26 *
e873c03a 27 * @see technical details at
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28 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
29 */
30
31#include "avcodec.h"
64a2e844 32#include "blockdsp.h"
541427ab 33#include "bytestream.h"
c67b449b 34#include "bswapdsp.h"
c63ea92b 35#include "get_bits.h"
c63ea92b 36#include "aandcttab.h"
f3eb0083 37#include "eaidct.h"
e3fcb143 38#include "idctdsp.h"
594d4d5d 39#include "internal.h"
c63ea92b 40#include "mpeg12data.h"
64a2e844 41#include "mpeg12vlc.h"
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42
43#define EA_PREAMBLE_SIZE 8
44#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */
45#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */
46#define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
47
48typedef struct MadContext {
591766a3 49 AVCodecContext *avctx;
e74433a8 50 BlockDSPContext bdsp;
c67b449b 51 BswapDSPContext bbdsp;
e3fcb143 52 IDCTDSPContext idsp;
e4155f15 53 AVFrame *last_frame;
591766a3 54 GetBitContext gb;
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55 void *bitstream_buf;
56 unsigned int bitstream_buf_size;
88bd7fdc 57 DECLARE_ALIGNED(16, int16_t, block)[64];
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58 ScanTable scantable;
59 uint16_t quant_matrix[64];
60 int mb_x;
61 int mb_y;
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62} MadContext;
63
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64static av_cold int decode_init(AVCodecContext *avctx)
65{
591766a3 66 MadContext *s = avctx->priv_data;
c63ea92b 67 s->avctx = avctx;
716d413c 68 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
e74433a8 69 ff_blockdsp_init(&s->bdsp, avctx);
c67b449b 70 ff_bswapdsp_init(&s->bbdsp);
e3fcb143 71 ff_idctdsp_init(&s->idsp, avctx);
b4987f72 72 ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
e3fcb143 73 ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
c63ea92b 74 ff_mpeg12_init_vlcs();
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75
76 s->last_frame = av_frame_alloc();
77 if (!s->last_frame)
78 return AVERROR(ENOMEM);
79
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80 return 0;
81}
82
83static inline void comp(unsigned char *dst, int dst_stride,
84 unsigned char *src, int src_stride, int add)
85{
86 int j, i;
87 for (j=0; j<8; j++)
88 for (i=0; i<8; i++)
89 dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
90}
91
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92static inline void comp_block(MadContext *t, AVFrame *frame,
93 int mb_x, int mb_y,
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94 int j, int mv_x, int mv_y, int add)
95{
c63ea92b 96 if (j < 4) {
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97 comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
98 frame->linesize[0],
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99 t->last_frame->data[0] + (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x,
100 t->last_frame->linesize[0], add);
591766a3 101 } else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) {
c63ea92b 102 int index = j - 3;
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103 comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
104 frame->linesize[index],
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105 t->last_frame->data[index] + (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2),
106 t->last_frame->linesize[index], add);
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107 }
108}
109
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110static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
111 int mb_x, int mb_y, int j)
c63ea92b 112{
c63ea92b 113 if (j < 4) {
f3eb0083 114 ff_ea_idct_put_c(
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115 frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
116 frame->linesize[0], block);
591766a3 117 } else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) {
c63ea92b 118 int index = j - 3;
f3eb0083 119 ff_ea_idct_put_c(
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120 frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
121 frame->linesize[index], block);
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122 }
123}
124
88bd7fdc 125static inline void decode_block_intra(MadContext *s, int16_t * block)
c63ea92b 126{
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127 int level, i, j, run;
128 RLTable *rl = &ff_rl_mpeg1;
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129 const uint8_t *scantable = s->scantable.permutated;
130 int16_t *quant_matrix = s->quant_matrix;
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131
132 block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
133
134 /* The RL decoder is derived from mpeg1_decode_block_intra;
135 Escaped level and run values a decoded differently */
7d582280 136 i = 0;
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137 {
138 OPEN_READER(re, &s->gb);
139 /* now quantify & encode AC coefficients */
140 for (;;) {
141 UPDATE_CACHE(re, &s->gb);
142 GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
143
144 if (level == 127) {
145 break;
146 } else if (level != 0) {
147 i += run;
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148 if (i > 63) {
149 av_log(s->avctx, AV_LOG_ERROR,
150 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
151 return;
152 }
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153 j = scantable[i];
154 level = (level*quant_matrix[j]) >> 4;
155 level = (level-1)|1;
156 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
157 LAST_SKIP_BITS(re, &s->gb, 1);
158 } else {
159 /* escape */
160 UPDATE_CACHE(re, &s->gb);
161 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
162
163 UPDATE_CACHE(re, &s->gb);
164 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
165
166 i += run;
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167 if (i > 63) {
168 av_log(s->avctx, AV_LOG_ERROR,
169 "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
170 return;
171 }
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172 j = scantable[i];
173 if (level < 0) {
174 level = -level;
175 level = (level*quant_matrix[j]) >> 4;
176 level = (level-1)|1;
177 level = -level;
178 } else {
179 level = (level*quant_matrix[j]) >> 4;
180 level = (level-1)|1;
181 }
182 }
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183
184 block[j] = level;
185 }
186 CLOSE_READER(re, &s->gb);
187 }
188}
189
190static int decode_motion(GetBitContext *gb)
191{
192 int value = 0;
193 if (get_bits1(gb)) {
194 if (get_bits1(gb))
195 value = -17;
196 value += get_bits(gb, 4) + 1;
197 }
198 return value;
199}
200
759001c5 201static void decode_mb(MadContext *s, AVFrame *frame, int inter)
c63ea92b 202{
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203 int mv_map = 0;
204 int mv_x, mv_y;
205 int j;
206
207 if (inter) {
208 int v = decode210(&s->gb);
209 if (v < 2) {
210 mv_map = v ? get_bits(&s->gb, 6) : 63;
211 mv_x = decode_motion(&s->gb);
212 mv_y = decode_motion(&s->gb);
213 } else {
214 mv_map = 0;
215 }
216 }
217
218 for (j=0; j<6; j++) {
219 if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
220 int add = 2*decode_motion(&s->gb);
759001c5 221 comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
c63ea92b 222 } else {
e74433a8 223 s->bdsp.clear_block(s->block);
591766a3 224 decode_block_intra(s, s->block);
759001c5 225 idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
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226 }
227 }
228}
229
591766a3 230static void calc_quant_matrix(MadContext *s, int qscale)
c63ea92b 231{
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232 int i;
233
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234 s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
235 for (i=1; i<64; i++)
236 s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
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237}
238
239static int decode_frame(AVCodecContext *avctx,
df9b9567 240 void *data, int *got_frame,
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241 AVPacket *avpkt)
242{
243 const uint8_t *buf = avpkt->data;
244 int buf_size = avpkt->size;
591766a3 245 MadContext *s = avctx->priv_data;
759001c5 246 AVFrame *frame = data;
541427ab 247 GetByteContext gb;
591766a3 248 int width, height;
c63ea92b 249 int chunk_type;
759001c5 250 int inter, ret;
c63ea92b 251
541427ab 252 bytestream2_init(&gb, buf, buf_size);
c63ea92b 253
541427ab 254 chunk_type = bytestream2_get_le32(&gb);
c63ea92b 255 inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
541427ab 256 bytestream2_skip(&gb, 10);
c63ea92b 257
7ea1b347 258 av_reduce(&avctx->framerate.den, &avctx->framerate.num,
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259 bytestream2_get_le16(&gb), 1000, 1<<30);
260
261 width = bytestream2_get_le16(&gb);
262 height = bytestream2_get_le16(&gb);
263 bytestream2_skip(&gb, 1);
264 calc_quant_matrix(s, bytestream2_get_byte(&gb));
265 bytestream2_skip(&gb, 2);
c63ea92b 266
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267 if (bytestream2_get_bytes_left(&gb) < 2) {
268 av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
269 return AVERROR_INVALIDDATA;
270 }
c63ea92b 271
591766a3 272 if (avctx->width != width || avctx->height != height) {
e4155f15 273 av_frame_unref(s->last_frame);
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274 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
275 return ret;
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276 }
277
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278 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
279 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
280 return ret;
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281 }
282
e4155f15 283 if (inter && !s->last_frame->data[0]) {
7b89cd20 284 av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
e4155f15 285 ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
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286 if (ret < 0)
287 return ret;
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288 memset(s->last_frame->data[0], 0, s->last_frame->height *
289 s->last_frame->linesize[0]);
290 memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
291 s->last_frame->linesize[1]);
292 memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
293 s->last_frame->linesize[2]);
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294 }
295
42060c70 296 av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
541427ab 297 bytestream2_get_bytes_left(&gb));
591766a3 298 if (!s->bitstream_buf)
c63ea92b 299 return AVERROR(ENOMEM);
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300 s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
301 bytestream2_get_bytes_left(&gb) / 2);
302 init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
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303
304 for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
305 for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
759001c5 306 decode_mb(s, frame, inter);
c63ea92b 307
df9b9567 308 *got_frame = 1;
c63ea92b 309
759001c5 310 if (chunk_type != MADe_TAG) {
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311 av_frame_unref(s->last_frame);
312 if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
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313 return ret;
314 }
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315
316 return buf_size;
317}
318
319static av_cold int decode_end(AVCodecContext *avctx)
320{
321 MadContext *t = avctx->priv_data;
e4155f15 322 av_frame_free(&t->last_frame);
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323 av_free(t->bitstream_buf);
324 return 0;
325}
326
d36beb3f 327AVCodec ff_eamad_decoder = {
ec6402b7 328 .name = "eamad",
b2bed932 329 .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
ec6402b7 330 .type = AVMEDIA_TYPE_VIDEO,
36ef5369 331 .id = AV_CODEC_ID_MAD,
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332 .priv_data_size = sizeof(MadContext),
333 .init = decode_init,
334 .close = decode_end,
335 .decode = decode_frame,
336 .capabilities = CODEC_CAP_DR1,
c63ea92b 337};