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 "blockdsp.h"
31 #include "bswapdsp.h"
32 #include "get_bits.h"
33 #include "aandcttab.h"
34 #include "eaidct.h"
35 #include "idctdsp.h"
36 #include "internal.h"
37 #include "mpeg12.h"
38 #include "mpegvideo.h"
39 
40 typedef struct TqiContext {
44  unsigned int bitstream_buf_size;
45  DECLARE_ALIGNED(16, int16_t, block)[6][64];
46 } TqiContext;
47 
49 {
50  TqiContext *t = avctx->priv_data;
51  MpegEncContext *s = &t->s;
52  s->avctx = avctx;
53  ff_blockdsp_init(&s->bdsp, avctx);
55  ff_idctdsp_init(&s->idsp, avctx);
58  s->qscale = 1;
59  avctx->time_base = (AVRational){1, 15};
60  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
62  return 0;
63 }
64 
65 static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
66 {
67  int n;
68  s->bdsp.clear_blocks(block[0]);
69  for (n=0; n<6; n++)
70  if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
71  return -1;
72 
73  return 0;
74 }
75 
76 static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
77 {
78  MpegEncContext *s = &t->s;
79  int linesize = frame->linesize[0];
80  uint8_t *dest_y = frame->data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
81  uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
82  uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
83 
84  ff_ea_idct_put_c(dest_y , linesize, block[0]);
85  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
86  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
87  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
88  if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
89  ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
90  ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
91  }
92 }
93 
95 {
96  const int qscale = (215 - 2*quant)*5;
97  int i;
99  for(i=1; i<64; i++)
100  s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
101 }
102 
104  void *data, int *got_frame,
105  AVPacket *avpkt)
106 {
107  const uint8_t *buf = avpkt->data;
108  int buf_size = avpkt->size;
109  const uint8_t *buf_end = buf+buf_size;
110  TqiContext *t = avctx->priv_data;
111  MpegEncContext *s = &t->s;
112  AVFrame *frame = data;
113  int ret;
114 
115  s->width = AV_RL16(&buf[0]);
116  s->height = AV_RL16(&buf[2]);
117  tqi_calculate_qtable(s, buf[4]);
118  buf += 8;
119 
120  ret = ff_set_dimensions(s->avctx, s->width, s->height);
121  if (ret < 0)
122  return ret;
123 
124  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
125  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
126  return ret;
127  }
128 
130  buf_end - buf);
131  if (!t->bitstream_buf)
132  return AVERROR(ENOMEM);
133  t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
134  (buf_end - buf) / 4);
135  init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
136 
137  s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
138  for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
139  for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
140  {
141  if (tqi_decode_mb(s, t->block) < 0)
142  break;
143  tqi_idct_put(t, frame, t->block);
144  }
145 
146  *got_frame = 1;
147  return buf_size;
148 }
149 
151 {
152  TqiContext *t = avctx->priv_data;
154  return 0;
155 }
156 
158  .name = "eatqi",
159  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
160  .type = AVMEDIA_TYPE_VIDEO,
161  .id = AV_CODEC_ID_TQI,
162  .priv_data_size = sizeof(TqiContext),
166  .capabilities = CODEC_CAP_DR1,
167 };
IDCTDSPContext idsp
Definition: mpegvideo.h:354
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
AVCodec ff_eatqi_decoder
Definition: eatqi.c:157
static av_cold int tqi_decode_init(AVCodecContext *avctx)
Definition: eatqi.c:48
av_cold void ff_mpeg12_init_vlcs(void)
Definition: mpeg12.c:138
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:133
#define AV_RL16(x)
Definition: intreadwrite.h:220
int size
Definition: avcodec.h:974
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:58
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1254
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:59
mpegvideo header.
AVCodec.
Definition: avcodec.h:2796
int qscale
QP.
Definition: mpegvideo.h:332
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1175
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
static av_cold int tqi_decode_end(AVCodecContext *avctx)
Definition: eatqi.c:150
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
const char data[16]
Definition: mxf.c:70
bitstream reader API header.
static int tqi_decode_mb(MpegEncContext *s, int16_t(*block)[64])
Definition: eatqi.c:65
void * bitstream_buf
Definition: eatqi.c:43
const uint16_t ff_mpeg1_default_intra_matrix[64]
Definition: mpeg12data.c:30
BswapDSPContext bsdsp
Definition: eatqi.c:42
#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:311
#define AVERROR(e)
Definition: error.h:43
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
int flags
CODEC_FLAG_*.
Definition: avcodec.h:1144
GetBitContext gb
Definition: mpegvideo.h:558
Libavcodec external API header.
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:49
int width
picture width / height.
Definition: avcodec.h:1224
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
MpegEncContext s
Definition: eatqi.c:41
#define av_cold
Definition: attributes.h:66
BlockDSPContext bdsp
Definition: mpegvideo.h:351
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:58
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
ScanTable intra_scantable
Definition: mpegvideo.h:214
int height
picture size. must be a multiple of 16
Definition: mpegvideo.h:223
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:612
static void tqi_calculate_qtable(MpegEncContext *s, int quant)
Definition: eatqi.c:94
rational number numerator/denominator
Definition: rational.h:43
uint8_t * data
Definition: avcodec.h:973
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:115
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:153
static void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t(*block)[64])
Definition: eatqi.c:76
int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
Definition: mpeg12dec.c:214
const uint8_t * quant
void * priv_data
Definition: avcodec.h:1092
AAN (Arai Agui Nakajima) (I)DCT tables.
MpegEncContext.
Definition: mpegvideo.h:204
struct AVCodecContext * avctx
Definition: mpegvideo.h:221
void ff_ea_idct_put_c(uint8_t *dest, int linesize, int16_t *block)
Definition: eaidct.c:80
common internal api header.
#define CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:637
unsigned int bitstream_buf_size
Definition: eatqi.c:44
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:28
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:156
static int tqi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eatqi.c:103
uint16_t intra_matrix[64]
matrix transmitted in the bitstream
Definition: mpegvideo.h:422
This structure stores compressed data.
Definition: avcodec.h:950
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:141
int16_t block[6][64]
Definition: eatqi.c:45
static int16_t block[64]
Definition: dct-test.c:88