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 
39 typedef struct TqiContext {
45 
47  unsigned int bitstream_buf_size;
48 
49  int mb_x, mb_y;
50  uint16_t intra_matrix[64];
51  int last_dc[3];
52 
53  DECLARE_ALIGNED(16, int16_t, block)[6][64];
54 } TqiContext;
55 
57 {
58  TqiContext *t = avctx->priv_data;
59 
60  ff_blockdsp_init(&t->bdsp, avctx);
62  ff_idctdsp_init(&t->idsp, avctx);
65 
66  avctx->framerate = (AVRational){ 15, 1 };
67  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
69  return 0;
70 }
71 
72 static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
73 {
74  int n;
75 
76  t->bdsp.clear_blocks(block[0]);
77  for (n = 0; n < 6; n++) {
78  int ret = ff_mpeg1_decode_block_intra(&t->gb,
79  t->intra_matrix,
81  t->last_dc, block[n], n, 1);
82  if (ret < 0)
83  return -1;
84  }
85 
86  return 0;
87 }
88 
89 static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
90  int16_t (*block)[64])
91 {
92  TqiContext *t = avctx->priv_data;
93  int linesize = frame->linesize[0];
94  uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
95  uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
96  uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
97 
98  ff_ea_idct_put_c(dest_y , linesize, block[0]);
99  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
100  ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
101  ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
102 
103  if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
104  ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
105  ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
106  }
107 }
108 
110 {
111  const int qscale = (215 - 2*quant)*5;
112  int i;
113 
115  for(i=1; i<64; i++)
116  t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
117 }
118 
120  void *data, int *got_frame,
121  AVPacket *avpkt)
122 {
123  const uint8_t *buf = avpkt->data;
124  int buf_size = avpkt->size;
125  const uint8_t *buf_end = buf+buf_size;
126  TqiContext *t = avctx->priv_data;
127  AVFrame *frame = data;
128  int ret, w, h;
129 
130  w = AV_RL16(&buf[0]);
131  h = AV_RL16(&buf[2]);
132  tqi_calculate_qtable(t, buf[4]);
133  buf += 8;
134 
135  ret = ff_set_dimensions(avctx, w, h);
136  if (ret < 0)
137  return ret;
138 
139  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
140  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
141  return ret;
142  }
143 
145  buf_end - buf);
146  if (!t->bitstream_buf)
147  return AVERROR(ENOMEM);
148  t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
149  (buf_end - buf) / 4);
150  init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
151 
152  t->last_dc[0] =
153  t->last_dc[1] =
154  t->last_dc[2] = 0;
155  for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
156  for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
157  if (tqi_decode_mb(t, t->block) < 0)
158  break;
159  tqi_idct_put(avctx, frame, t->block);
160  }
161  }
162 
163  *got_frame = 1;
164  return buf_size;
165 }
166 
168 {
169  TqiContext *t = avctx->priv_data;
171  return 0;
172 }
173 
175  .name = "eatqi",
176  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
177  .type = AVMEDIA_TYPE_VIDEO,
178  .id = AV_CODEC_ID_TQI,
179  .priv_data_size = sizeof(TqiContext),
181  .close = tqi_decode_end,
183  .capabilities = AV_CODEC_CAP_DR1,
184 };
AVRational framerate
Definition: avcodec.h:3063
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
AVCodec ff_eatqi_decoder
Definition: eatqi.c:174
static av_cold int tqi_decode_init(AVCodecContext *avctx)
Definition: eatqi.c:56
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:134
Scantable.
Definition: idctdsp.h:29
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:58
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1621
#define AV_RL16
Definition: intreadwrite.h:42
static void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame, int16_t(*block)[64])
Definition: eatqi.c:89
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:60
uint8_t permutated[64]
Definition: idctdsp.h:31
static int tqi_decode_mb(TqiContext *t, int16_t(*block)[64])
Definition: eatqi.c:72
AVCodec.
Definition: avcodec.h:3120
uint8_t
static void tqi_calculate_qtable(TqiContext *t, int quant)
Definition: eatqi.c:109
#define av_cold
Definition: attributes.h:66
void(* bswap_buf)(uint32_t *dst, const uint32_t *src, int w)
Definition: bswapdsp.h:25
static av_cold int tqi_decode_end(AVCodecContext *avctx)
Definition: eatqi.c:167
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:1346
bitstream reader API header.
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:763
void * bitstream_buf
Definition: eatqi.c:46
const uint16_t ff_mpeg1_default_intra_matrix[64]
Definition: mpeg12data.c:30
BswapDSPContext bsdsp
Definition: eatqi.c:42
BlockDSPContext bdsp
Definition: eatqi.c:41
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:190
int last_dc[3]
Definition: eatqi.c:51
#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:148
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1503
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
int mb_x
Definition: eatqi.c:49
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:49
ScanTable intra_scantable
Definition: eatqi.c:44
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: avconv.c:1288
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
GetBitContext gb
Definition: eatqi.c:40
Libavcodec external API header.
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:58
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:158
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
main external API structure.
Definition: avcodec.h:1409
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:589
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:362
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:115
IDCTDSPContext idsp
Definition: eatqi.c:43
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:146
int mb_y
Definition: eatqi.c:49
void ff_ea_idct_put_c(uint8_t *dest, int linesize, int16_t *block)
Definition: eaidct.c:80
int ff_mpeg1_decode_block_intra(GetBitContext *gb, const uint16_t *quant_matrix, uint8_t *const scantable, int last_dc[3], int16_t *block, int index, int qscale)
Definition: mpeg12.c:242
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:59
common internal api header.
uint16_t intra_matrix[64]
Definition: eatqi.c:50
unsigned int bitstream_buf_size
Definition: eatqi.c:47
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
av_cold void ff_bswapdsp_init(BswapDSPContext *c)
Definition: bswapdsp.c:49
void * priv_data
Definition: avcodec.h:1451
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:147
static int tqi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eatqi.c:119
This structure stores compressed data.
Definition: avcodec.h:1323
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:838
int16_t block[6][64]
Definition: eatqi.c:53