Libav
eatqi.c
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1 /*
2  * Electronic Arts TQI Video Decoder
3  * Copyright (c) 2007-2009 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 
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "aandcttab.h"
32 #include "eaidct.h"
33 #include "internal.h"
34 #include "mpeg12.h"
35 #include "mpegvideo.h"
36 
37 typedef struct TqiContext {
40  unsigned int bitstream_buf_size;
41  DECLARE_ALIGNED(16, int16_t, block)[6][64];
42 } TqiContext;
43 
45 {
46  TqiContext *t = avctx->priv_data;
47  MpegEncContext *s = &t->s;
48  s->avctx = avctx;
49  ff_dsputil_init(&s->dsp, avctx);
52  s->qscale = 1;
53  avctx->time_base = (AVRational){1, 15};
54  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
56  return 0;
57 }
58 
59 static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
60 {
61  int n;
62  s->dsp.clear_blocks(block[0]);
63  for (n=0; n<6; n++)
64  if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
65  return -1;
66 
67  return 0;
68 }
69 
70 static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
71 {
72  MpegEncContext *s = &t->s;
73  int linesize = frame->linesize[0];
74  uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
75  uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
76  uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
77 
78  ff_ea_idct_put_c(dest_y , linesize, block[0]);
79  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
80  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
81  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
82  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
83  ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
84  ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
85  }
86 }
87 
89 {
90  const int qscale = (215 - 2*quant)*5;
91  int i;
93  for(i=1; i<64; i++)
94  s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
95 }
96 
97 static int tqi_decode_frame(AVCodecContext *avctx,
98  void *data, int *got_frame,
99  AVPacket *avpkt)
100 {
101  const uint8_t *buf = avpkt->data;
102  int buf_size = avpkt->size;
103  const uint8_t *buf_end = buf+buf_size;
104  TqiContext *t = avctx->priv_data;
105  MpegEncContext *s = &t->s;
106  AVFrame *frame = data;
107  int ret;
108 
109  s->width = AV_RL16(&buf[0]);
110  s->height = AV_RL16(&buf[2]);
111  tqi_calculate_qtable(s, buf[4]);
112  buf += 8;
113 
114  ret = ff_set_dimensions(s->avctx, s->width, s->height);
115  if (ret < 0)
116  return ret;
117 
118  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
119  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
120  return ret;
121  }
122 
124  buf_end - buf);
125  if (!t->bitstream_buf)
126  return AVERROR(ENOMEM);
127  s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
128  init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
129 
130  s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
131  for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
132  for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
133  {
134  if (tqi_decode_mb(s, t->block) < 0)
135  break;
136  tqi_idct_put(t, frame, t->block);
137  }
138 
139  *got_frame = 1;
140  return buf_size;
141 }
142 
144 {
145  TqiContext *t = avctx->priv_data;
147  return 0;
148 }
149 
151  .name = "eatqi",
152  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
153  .type = AVMEDIA_TYPE_VIDEO,
154  .id = AV_CODEC_ID_TQI,
155  .priv_data_size = sizeof(TqiContext),
159  .capabilities = CODEC_CAP_DR1,
160 };
av_cold void ff_dsputil_init(DSPContext *c, AVCodecContext *avctx)
Definition: dsputil.c:2440
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, int idct_permutation_type)
Definition: dsputil.c:130
This structure describes decoded (raw) audio or video data.
Definition: frame.h:107
AVCodec ff_eatqi_decoder
Definition: eatqi.c:150
static av_cold int tqi_decode_init(AVCodecContext *avctx)
Definition: eatqi.c:44
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:139
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:144
int size
Definition: avcodec.h:974
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:58
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1247
#define AV_RL16
Definition: intreadwrite.h:42
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer with padding, reusing the given one if large enough.
Definition: utils.c:70
mpegvideo header.
AVCodec.
Definition: avcodec.h:2755
int qscale
QP.
Definition: mpegvideo.h:392
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1173
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:269
uint8_t
#define av_cold
Definition: attributes.h:66
static av_cold int tqi_decode_end(AVCodecContext *avctx)
Definition: eatqi.c:143
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:711
const char data[16]
Definition: mxf.c:66
uint8_t * data
Definition: avcodec.h:973
bitstream reader API header.
uint8_t idct_permutation[64]
idct input permutation.
Definition: dsputil.h:240
static int tqi_decode_mb(MpegEncContext *s, int16_t(*block)[64])
Definition: eatqi.c:59
static float t
Definition: output.c:52
void * bitstream_buf
Definition: eatqi.c:39
const uint16_t ff_mpeg1_default_intra_matrix[64]
Definition: mpeg12data.c:30
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:186
int last_dc[3]
last DC values for MPEG1
Definition: mpegvideo.h:371
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: dsputil.h:202
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:142
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1142
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:2762
GetBitContext gb
Definition: mpegvideo.h:632
int width
picture width / height.
Definition: avcodec.h:1217
void(* clear_blocks)(int16_t *blocks)
Definition: dsputil.h:143
#define FF_NO_IDCT_PERM
Definition: dsputil.h:242
MpegEncContext s
Definition: eatqi.c:38
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:125
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
main external API structure.
Definition: avcodec.h:1054
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:489
ScanTable intra_scantable
Definition: mpegvideo.h:319
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:268
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:575
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: dsputil.c:107
static void tqi_calculate_qtable(MpegEncContext *s, int quant)
Definition: eatqi.c:88
rational number numerator/denominator
Definition: rational.h:43
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
DSPContext dsp
pointers for accelerated dsp functions
Definition: mpegvideo.h:411
static void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t(*block)[64])
Definition: eatqi.c:70
int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:208
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: frame.h:113
MpegEncContext.
Definition: mpegvideo.h:264
struct AVCodecContext * avctx
Definition: mpegvideo.h:266
void ff_ea_idct_put_c(uint8_t *dest, int linesize, int16_t *block)
Definition: eaidct.c:80
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
common internal api header.
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:113
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:670
unsigned int bitstream_buf_size
Definition: eatqi.c:40
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:498
void * priv_data
Definition: avcodec.h:1090
static int tqi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eatqi.c:97
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:492
This structure stores compressed data.
Definition: avcodec.h:950
int16_t block[6][64]
Definition: eatqi.c:41
static int16_t block[64]
Definition: dct-test.c:170