FFmpeg  4.3.8
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 FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Electronic Arts TGQ Video Decoder
25  * @author Peter Ross <pross@xvid.org>
26  *
27  * Technical details here:
28  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
29  */
30 
31 #define BITSTREAM_READER_LE
32 #include "aandcttab.h"
33 #include "avcodec.h"
34 #include "bytestream.h"
35 #include "eaidct.h"
36 #include "get_bits.h"
37 #include "idctdsp.h"
38 #include "internal.h"
39 
40 typedef struct TgqContext {
42  int width, height;
44  int qtable[64];
45  DECLARE_ALIGNED(16, int16_t, block)[6][64];
47 } TgqContext;
48 
50 {
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->framerate = (AVRational){ 15, 1 };
57  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
58  return 0;
59 }
60 
61 static int tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
62 {
64  int i, j, value;
65  block[0] = get_sbits(gb, 8) * s->qtable[0];
66  for (i = 1; i < 64;) {
67  switch (show_bits(gb, 3)) {
68  case 4:
69  if (i >= 63)
70  return AVERROR_INVALIDDATA;
71  block[perm[i++]] = 0;
72  case 0:
73  block[perm[i++]] = 0;
74  skip_bits(gb, 3);
75  break;
76  case 5:
77  case 1:
78  skip_bits(gb, 2);
79  value = get_bits(gb, 6);
80  if (value > 64 - i)
81  return AVERROR_INVALIDDATA;
82  for (j = 0; j < value; j++)
83  block[perm[i++]] = 0;
84  break;
85  case 6:
86  skip_bits(gb, 3);
87  block[perm[i]] = -s->qtable[perm[i]];
88  i++;
89  break;
90  case 2:
91  skip_bits(gb, 3);
92  block[perm[i]] = s->qtable[perm[i]];
93  i++;
94  break;
95  case 7: // 111b
96  case 3: // 011b
97  skip_bits(gb, 2);
98  if (show_bits(gb, 6) == 0x3F) {
99  skip_bits(gb, 6);
100  block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
101  } else {
102  block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
103  }
104  i++;
105  break;
106  }
107  }
108  block[0] += 128 << 4;
109  return 0;
110 }
111 
112 static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
113  int mb_x, int mb_y)
114 {
115  ptrdiff_t linesize = frame->linesize[0];
116  uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
117  uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
118  uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
119 
120  ff_ea_idct_put_c(dest_y , linesize, block[0]);
121  ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
122  ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
123  ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
124  if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
125  ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
126  ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
127  }
128 }
129 
130 static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
131  ptrdiff_t dst_stride, int dc)
132 {
133  int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
134  int j;
135  for (j = 0; j < 8; j++)
136  memset(dst + j * dst_stride, level, 8);
137 }
138 
140  int mb_x, int mb_y, const int8_t *dc)
141 {
142  ptrdiff_t linesize = frame->linesize[0];
143  uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
144  uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
145  uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
146  tgq_dconly(s, dest_y, linesize, dc[0]);
147  tgq_dconly(s, dest_y + 8, linesize, dc[1]);
148  tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
149  tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
150  if (!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
151  tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
152  tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
153  }
154 }
155 
156 static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
157 {
158  int mode;
159  int i;
160  int8_t dc[6];
161 
162  mode = bytestream2_get_byte(&s->gb);
163  if (mode > 12) {
165  int ret = init_get_bits8(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode));
166  if (ret < 0)
167  return ret;
168 
169  for (i = 0; i < 6; i++) {
170  int ret = tgq_decode_block(s, s->block[i], &gb);
171  if (ret < 0)
172  return ret;
173  }
174  tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
175  bytestream2_skip(&s->gb, mode);
176  } else {
177  if (mode == 3) {
178  memset(dc, bytestream2_get_byte(&s->gb), 4);
179  dc[4] = bytestream2_get_byte(&s->gb);
180  dc[5] = bytestream2_get_byte(&s->gb);
181  } else if (mode == 6) {
182  bytestream2_get_buffer(&s->gb, dc, 6);
183  } else if (mode == 12) {
184  for (i = 0; i < 6; i++) {
185  dc[i] = bytestream2_get_byte(&s->gb);
186  bytestream2_skip(&s->gb, 1);
187  }
188  } else {
189  av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
190  return -1;
191  }
192  tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
193  }
194  return 0;
195 }
196 
198 {
199  int i, j;
200  const int a = (14 * (100 - quant)) / 100 + 1;
201  const int b = (11 * (100 - quant)) / 100 + 4;
202  for (j = 0; j < 8; j++)
203  for (i = 0; i < 8; i++)
204  s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
205  ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
206 }
207 
209  void *data, int *got_frame,
210  AVPacket *avpkt)
211 {
212  const uint8_t *buf = avpkt->data;
213  int buf_size = avpkt->size;
214  TgqContext *s = avctx->priv_data;
215  AVFrame *frame = data;
216  int x, y, ret;
217  int big_endian;
218 
219  if (buf_size < 16) {
220  av_log(avctx, AV_LOG_WARNING, "truncated header\n");
221  return AVERROR_INVALIDDATA;
222  }
223  big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
224  bytestream2_init(&s->gb, buf + 8, buf_size - 8);
225  if (big_endian) {
226  s->width = bytestream2_get_be16u(&s->gb);
227  s->height = bytestream2_get_be16u(&s->gb);
228  } else {
229  s->width = bytestream2_get_le16u(&s->gb);
230  s->height = bytestream2_get_le16u(&s->gb);
231  }
232 
233  ret = ff_set_dimensions(s->avctx, s->width, s->height);
234  if (ret < 0)
235  return ret;
236 
237  tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
238  bytestream2_skip(&s->gb, 3);
239 
240  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
241  return ret;
242  frame->key_frame = 1;
243  frame->pict_type = AV_PICTURE_TYPE_I;
244 
245  for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
246  for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
247  if (tgq_decode_mb(s, frame, y, x) < 0)
248  return AVERROR_INVALIDDATA;
249 
250  *got_frame = 1;
251 
252  return avpkt->size;
253 }
254 
256  .name = "eatgq",
257  .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
258  .type = AVMEDIA_TYPE_VIDEO,
259  .id = AV_CODEC_ID_TGQ,
260  .priv_data_size = sizeof(TgqContext),
263  .capabilities = AV_CODEC_CAP_DR1,
264 };
AVRational framerate
Definition: avcodec.h:2069
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int height
Definition: eatgq.c:42
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
static void tgq_idct_put_mb(TgqContext *s, int16_t(*block)[64], AVFrame *frame, int mb_x, int mb_y)
Definition: eatgq.c:112
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
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:104
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
Scantable.
Definition: idctdsp.h:31
int size
Definition: packet.h:356
const char * b
Definition: vf_curves.c:116
static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame, int mb_x, int mb_y, const int8_t *dc)
Definition: eatgq.c:139
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
uint8_t permutated[64]
Definition: idctdsp.h:33
AVCodec.
Definition: codec.h:190
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:359
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static av_cold int tgq_decode_init(AVCodecContext *avctx)
Definition: eatgq.c:49
uint8_t
#define av_cold
Definition: attributes.h:88
static AVFrame * frame
GetByteContext gb
Definition: eatgq.c:46
const char data[16]
Definition: mxf.c:91
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
uint8_t * data
Definition: packet.h:355
const uint8_t * buffer
Definition: bytestream.h:34
bitstream reader API header.
void ff_ea_idct_put_c(uint8_t *dest, ptrdiff_t linesize, int16_t *block)
Definition: eaidct.c:80
static int tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
Definition: eatgq.c:61
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:308
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:263
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:606
const char * name
Name of the codec implementation.
Definition: codec.h:197
ScanTable scantable
Definition: eatgq.c:43
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
#define FFMIN(a, b)
Definition: common.h:96
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:50
int width
picture width / height.
Definition: avcodec.h:699
static void tgq_dconly(TgqContext *s, unsigned char *dst, ptrdiff_t dst_stride, int dc)
Definition: eatgq.c:130
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
perm
Definition: f_perms.c:74
#define s(width, name)
Definition: cbs_vp9.c:257
#define AV_RL32
Definition: intreadwrite.h:146
static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
Definition: eatgq.c:156
AVCodec ff_eatgq_decoder
Definition: eatgq.c:255
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
const uint16_t ff_inv_aanscales[64]
Definition: aandcttab.c:38
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:526
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
double value
Definition: eval.c:98
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
Rational number (pair of numerator and denominator).
Definition: rational.h:58
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
int qtable[64]
Definition: eatgq.c:44
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> dc
const uint8_t * quant
AAN (Arai, Agui and Nakajima) (I)DCT tables.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int width
Definition: eatgq.c:42
uint8_t level
Definition: svq3.c:210
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
common internal api header.
void * priv_data
Definition: avcodec.h:553
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
int16_t block[6][64]
Definition: eatgq.c:45
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
static void tgq_calculate_qtable(TgqContext *s, int quant)
Definition: eatgq.c:197
static int tgq_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: eatgq.c:208
This structure stores compressed data.
Definition: packet.h:332
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
AVCodecContext * avctx
Definition: eatgq.c:41