eatgq.c
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1 /*
2  * Electronic Arts TGQ Video Decoder
3  * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
31 #include "avcodec.h"
32 #define BITSTREAM_READER_LE
33 #include "get_bits.h"
34 #include "bytestream.h"
35 #include "dsputil.h"
36 #include "aandcttab.h"
37 #include "eaidct.h"
38 #include "internal.h"
39 
40 typedef struct TgqContext {
45  int qtable[64];
48 } TgqContext;
49 
51  TgqContext *s = avctx->priv_data;
52  uint8_t idct_permutation[64];
53  s->avctx = avctx;
55  ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
56  avctx->time_base = (AVRational){1, 15};
57  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
58  return 0;
59 }
60 
62  uint8_t *perm = s->scantable.permutated;
63  int i,j,value;
64  block[0] = get_sbits(gb,8) * s->qtable[0];
65  for(i=1; i<64; ) {
66  switch(show_bits(gb,3)) {
67  case 4:
68  block[perm[i++]] = 0;
69  case 0:
70  block[perm[i++]] = 0;
71  skip_bits(gb,3);
72  break;
73  case 5:
74  case 1:
75  skip_bits(gb,2);
76  value = get_bits(gb,6);
77  for(j=0; j<value; j++)
78  block[perm[i++]] = 0;
79  break;
80  case 6:
81  skip_bits(gb,3);
82  block[perm[i]] = -s->qtable[perm[i]];
83  i++;
84  break;
85  case 2:
86  skip_bits(gb,3);
87  block[perm[i]] = s->qtable[perm[i]];
88  i++;
89  break;
90  case 7: // 111b
91  case 3: // 011b
92  skip_bits(gb,2);
93  if (show_bits(gb,6)==0x3F) {
94  skip_bits(gb, 6);
95  block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]];
96  }else{
97  block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]];
98  }
99  i++;
100  break;
101  }
102  }
103  block[0] += 128<<4;
104 }
105 
106 static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){
107  int linesize= s->frame.linesize[0];
108  uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
109  uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
110  uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
111 
112  ff_ea_idct_put_c(dest_y , linesize, block[0]);
113  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
114  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
115  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
116  if(!(s->avctx->flags&CODEC_FLAG_GRAY)){
117  ff_ea_idct_put_c(dest_cb, s->frame.linesize[1], block[4]);
118  ff_ea_idct_put_c(dest_cr, s->frame.linesize[2], block[5]);
119  }
120 }
121 
122 static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){
123  int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4);
124  int j;
125  for(j=0;j<8;j++)
126  memset(dst+j*dst_stride, level, 8);
127 }
128 
129 static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
130 {
131  int linesize= s->frame.linesize[0];
132  uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
133  uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
134  uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
135  tgq_dconly(s,dest_y , linesize, dc[0]);
136  tgq_dconly(s,dest_y + 8, linesize, dc[1]);
137  tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]);
138  tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]);
139  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
140  tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]);
141  tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]);
142  }
143 }
144 
145 static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x){
146  int mode;
147  int i;
148  int8_t dc[6];
149 
150  mode = bytestream2_get_byte(&s->gb);
151  if (mode>12) {
152  GetBitContext gb;
153  init_get_bits(&gb, s->gb.buffer, FFMIN(s->gb.buffer_end - s->gb.buffer, mode) * 8);
154  for(i=0; i<6; i++)
155  tgq_decode_block(s, s->block[i], &gb);
156  tgq_idct_put_mb(s, s->block, mb_x, mb_y);
157  bytestream2_skip(&s->gb, mode);
158  }else{
159  if (mode==3) {
160  memset(dc, bytestream2_get_byte(&s->gb), 4);
161  dc[4] = bytestream2_get_byte(&s->gb);
162  dc[5] = bytestream2_get_byte(&s->gb);
163  }else if (mode==6) {
164  bytestream2_get_buffer(&s->gb, dc, 6);
165  }else if (mode==12) {
166  for (i = 0; i < 6; i++) {
167  dc[i] = bytestream2_get_byte(&s->gb);
168  bytestream2_skip(&s->gb, 1);
169  }
170  }else{
171  av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
172  }
173  tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
174  }
175 }
176 
177 static void tgq_calculate_qtable(TgqContext *s, int quant){
178  int i,j;
179  const int a = (14*(100-quant))/100 + 1;
180  const int b = (11*(100-quant))/100 + 4;
181  for(j=0;j<8;j++)
182  for(i=0;i<8;i++)
183  s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4);
184 }
185 
187  void *data, int *got_frame,
188  AVPacket *avpkt){
189  const uint8_t *buf = avpkt->data;
190  int buf_size = avpkt->size;
191  TgqContext *s = avctx->priv_data;
192  int x,y;
193  int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
194 
195  if (buf_size < 16) {
196  av_log(avctx, AV_LOG_WARNING, "truncated header\n");
197  return -1;
198  }
199  bytestream2_init(&s->gb, buf + 8, buf_size - 8);
200  if (big_endian) {
201  s->width = bytestream2_get_be16u(&s->gb);
202  s->height = bytestream2_get_be16u(&s->gb);
203  } else {
204  s->width = bytestream2_get_le16u(&s->gb);
205  s->height = bytestream2_get_le16u(&s->gb);
206  }
207 
208  if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
210  if (s->frame.data[0])
211  avctx->release_buffer(avctx, &s->frame);
212  }
213  tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
214  bytestream2_skip(&s->gb, 3);
215 
216  if (!s->frame.data[0]) {
217  s->frame.key_frame = 1;
220  if (ff_get_buffer(avctx, &s->frame)) {
221  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
222  return -1;
223  }
224  }
225 
226  for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
227  for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
228  tgq_decode_mb(s, y, x);
229 
230  *got_frame = 1;
231  *(AVFrame*)data = s->frame;
232 
233  return avpkt->size;
234 }
235 
237  TgqContext *s = avctx->priv_data;
238  if (s->frame.data[0])
239  s->avctx->release_buffer(avctx, &s->frame);
240  return 0;
241 }
242 
244  .name = "eatgq",
245  .type = AVMEDIA_TYPE_VIDEO,
246  .id = AV_CODEC_ID_TGQ,
247  .priv_data_size = sizeof(TgqContext),
251  .capabilities = CODEC_CAP_DR1,
252  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
253 };
int height
Definition: eatgq.c:43
const uint8_t ff_zigzag_direct[64]
Definition: dsputil.c:59
This structure describes decoded (raw) audio or video data.
Definition: avcodec.h:989
int buffer_hints
codec suggestion on buffer type if != 0
Definition: avcodec.h:1253
void(* release_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called to release buffers which were allocated with get_buffer.
Definition: avcodec.h:2259
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:237
Scantable.
Definition: dsputil.h:181
void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Definition: utils.c:149
int size
Definition: avcodec.h:916
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1533
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:130
uint8_t permutated[64]
Definition: dsputil.h:183
AVCodec.
Definition: avcodec.h:2960
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:223
static av_cold int tgq_decode_init(AVCodecContext *avctx)
Definition: eatgq.c:50
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1465
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:228
uint8_t
static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
Definition: eatgq.c:129
#define b
Definition: input.c:52
GetByteContext gb
Definition: eatgq.c:47
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:915
const uint8_t * buffer
Definition: bytestream.h:33
bitstream reader API header.
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:335
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:159
static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb)
Definition: eatgq.c:61
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:258
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1434
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
const char * name
Name of the codec implementation.
Definition: avcodec.h:2967
static void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc)
Definition: eatgq.c:122
ScanTable scantable
Definition: eatgq.c:44
struct TgqContext TgqContext
const uint8_t * buffer_end
Definition: bytestream.h:33
struct AVRational AVRational
rational number numerator/denominator
static DCTELEM block[64]
Definition: dct-test.c:169
enum AVPictureType pict_type
Picture type of the frame, see ?_TYPE below.
Definition: avcodec.h:1065
int width
picture width / height.
Definition: avcodec.h:1508
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame)
Get a buffer for a frame.
Definition: utils.c:464
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:251
#define FF_NO_IDCT_PERM
Definition: dsputil.h:427
#define AV_RL32
Definition: intreadwrite.h:146
AVCodec ff_eatgq_decoder
Definition: eatgq.c:243
external API header
int linesize[AV_NUM_DATA_POINTERS]
Size, in bytes, of the data for each picture/channel plane.
Definition: avcodec.h:1008
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
main external API structure.
Definition: avcodec.h:1339
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:326
AVFrame frame
Definition: eatgq.c:42
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:260
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:372
int qtable[64]
Definition: eatgq.c:45
void ff_init_scantable_permutation(uint8_t *idct_permutation, int idct_permutation_type)
Definition: dsputil.c:143
short DCTELEM
Definition: dsputil.h:39
const uint8_t * quant
AAN (Arai Agui Nakajima) (I)DCT tables.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
int width
Definition: eatgq.c:43
uint8_t level
Definition: svq3.c:125
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
common internal api header.
static void tgq_idct_put_mb(TgqContext *s, DCTELEM(*block)[64], int mb_x, int mb_y)
Definition: eatgq.c:106
void ff_ea_idct_put_c(uint8_t *dest, int linesize, DCTELEM *block)
Definition: eaidct.c:81
static av_cold int tgq_decode_end(AVCodecContext *avctx)
Definition: eatgq.c:236
DCTELEM block[6][64]
Definition: eatgq.c:46
DSP utils.
void * priv_data
Definition: avcodec.h:1382
void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: dsputil.c:122
int key_frame
1 -> keyframe, 0-> not
Definition: avcodec.h:1058
static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x)
Definition: eatgq.c:145
static void tgq_calculate_qtable(TgqContext *s, int quant)
Definition: eatgq.c:177
static int tgq_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eatgq.c:186
This structure stores compressed data.
Definition: avcodec.h:898
AVCodecContext * avctx
Definition: eatgq.c:41