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vble.c
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1 /*
2  * VBLE Decoder
3  * Copyright (c) 2011 Derek Buitenhuis
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * VBLE Decoder
25  */
26 
27 #define BITSTREAM_READER_LE
28 
29 #include "libavutil/imgutils.h"
30 
31 #include "avcodec.h"
32 #include "get_bits.h"
33 #include "huffyuvdsp.h"
34 #include "internal.h"
35 #include "mathops.h"
36 #include "thread.h"
37 
38 typedef struct VBLEContext {
41 
42  int size;
43  uint8_t *val; ///< This array first holds the lengths of vlc symbols and then their value.
44 } VBLEContext;
45 
47 {
48  int i;
49  int allbits = 0;
50  static const uint8_t LUT[256] = {
51  8,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
52  5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
53  6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
54  5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
55  7,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
56  5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
57  6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
58  5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,
59  };
60 
61  /* Read all the lengths in first */
62  for (i = 0; i < ctx->size; i++) {
63  /* At most we need to read 9 bits total to get indices up to 8 */
64  int val = show_bits(gb, 8);
65 
66  // read reverse unary
67  if (val) {
68  val = LUT[val];
69  skip_bits(gb, val + 1);
70  ctx->val[i] = val;
71  } else {
72  skip_bits(gb, 8);
73  if (!get_bits1(gb))
74  return -1;
75  ctx->val[i] = 8;
76  }
77  allbits += ctx->val[i];
78  }
79 
80  /* Check we have enough bits left */
81  if (get_bits_left(gb) < allbits)
82  return -1;
83  return 0;
84 }
85 
87  GetBitContext *gb, int plane,
88  int offset, int width, int height)
89 {
90  uint8_t *dst = pic->data[plane];
91  uint8_t *val = ctx->val + offset;
92  int stride = pic->linesize[plane];
93  int i, j, left, left_top;
94 
95  for (i = 0; i < height; i++) {
96  for (j = 0; j < width; j++) {
97  /* get_bits can't take a length of 0 */
98  if (val[j]) {
99  int v = (1 << val[j]) + get_bits(gb, val[j]) - 1;
100  val[j] = (v >> 1) ^ -(v & 1);
101  }
102  }
103  if (i) {
104  left = 0;
105  left_top = dst[-stride];
106  ctx->hdsp.add_hfyu_median_pred(dst, dst - stride, val,
107  width, &left, &left_top);
108  } else {
109  dst[0] = val[0];
110  for (j = 1; j < width; j++)
111  dst[j] = val[j] + dst[j - 1];
112  }
113  dst += stride;
114  val += width;
115  }
116 }
117 
118 static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
119  AVPacket *avpkt)
120 {
121  VBLEContext *ctx = avctx->priv_data;
122  AVFrame *pic = data;
123  GetBitContext gb;
124  const uint8_t *src = avpkt->data;
125  int version;
126  int offset = 0;
127  int width_uv = avctx->width / 2, height_uv = avctx->height / 2;
128  int ret;
129  ThreadFrame frame = { .f = data };
130 
131  if (avpkt->size < 4 || avpkt->size - 4 > INT_MAX/8) {
132  av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n");
133  return AVERROR_INVALIDDATA;
134  }
135 
136  /* Allocate buffer */
137  if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
138  return ret;
139 
140  /* Set flags */
141  pic->key_frame = 1;
143 
144  /* Version should always be 1 */
145  version = AV_RL32(src);
146 
147  if (version != 1)
148  av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version);
149 
150  init_get_bits(&gb, src + 4, (avpkt->size - 4) * 8);
151 
152  /* Unpack */
153  if (vble_unpack(ctx, &gb) < 0) {
154  av_log(avctx, AV_LOG_ERROR, "Invalid Code\n");
155  return AVERROR_INVALIDDATA;
156  }
157 
158  /* Restore planes. Should be almost identical to Huffyuv's. */
159  vble_restore_plane(ctx, pic, &gb, 0, offset, avctx->width, avctx->height);
160 
161  /* Chroma */
162  if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) {
163  offset += avctx->width * avctx->height;
164  vble_restore_plane(ctx, pic, &gb, 1, offset, width_uv, height_uv);
165 
166  offset += width_uv * height_uv;
167  vble_restore_plane(ctx, pic, &gb, 2, offset, width_uv, height_uv);
168  }
169 
170  *got_frame = 1;
171 
172  return avpkt->size;
173 }
174 
176 {
177  VBLEContext *ctx = avctx->priv_data;
178  av_freep(&ctx->val);
179 
180  return 0;
181 }
182 
184 {
185  VBLEContext *ctx = avctx->priv_data;
186 
187  /* Stash for later use */
188  ctx->avctx = avctx;
189  ff_huffyuvdsp_init(&ctx->hdsp);
190 
191  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
192  avctx->bits_per_raw_sample = 8;
193 
194  ctx->size = av_image_get_buffer_size(avctx->pix_fmt,
195  avctx->width, avctx->height, 1);
196 
197  ctx->val = av_malloc_array(ctx->size, sizeof(*ctx->val));
198 
199  if (!ctx->val) {
200  av_log(avctx, AV_LOG_ERROR, "Could not allocate values buffer.\n");
201  vble_decode_close(avctx);
202  return AVERROR(ENOMEM);
203  }
204 
205  return 0;
206 }
207 
209  .name = "vble",
210  .long_name = NULL_IF_CONFIG_SMALL("VBLE Lossless Codec"),
211  .type = AVMEDIA_TYPE_VIDEO,
212  .id = AV_CODEC_ID_VBLE,
213  .priv_data_size = sizeof(VBLEContext),
215  .close = vble_decode_close,
219 };
int plane
Definition: avisynth_c.h:291
const char const char void * val
Definition: avisynth_c.h:634
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
misc image utilities
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
static int init_thread_copy(AVCodecContext *avctx)
Definition: tta.c:390
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
AVCodec ff_vble_decoder
Definition: vble.c:208
static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vble.c:118
int size
Definition: avcodec.h:1580
av_cold void ff_huffyuvdsp_init(HuffYUVDSPContext *c)
Definition: huffyuvdsp.c:108
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1876
int version
Definition: avisynth_c.h:629
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3048
AVCodec.
Definition: avcodec.h:3541
uint8_t
#define av_cold
Definition: attributes.h:82
Multithreading support functions.
static int vble_unpack(VBLEContext *ctx, GetBitContext *gb)
Definition: vble.c:46
static AVFrame * frame
#define height
uint8_t * data
Definition: avcodec.h:1579
bitstream reader API header.
void(* add_hfyu_median_pred)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, intptr_t w, int *left, int *left_top)
Definition: huffyuvdsp.h:40
HuffYUVDSPContext hdsp
Definition: vble.c:40
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:857
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters...
Definition: imgutils.c:361
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#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:176
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1743
const char * name
Name of the codec implementation.
Definition: avcodec.h:3548
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
Definition: avcodec.h:1018
#define ONLY_IF_THREADS_ENABLED(x)
Define a function with only the non-default version specified.
Definition: internal.h:215
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:258
#define width
int width
picture width / height.
Definition: avcodec.h:1835
AVFormatContext * ctx
Definition: movenc.c:48
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:282
#define src
Definition: vp9dsp.c:530
int size
Definition: vble.c:42
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
Definition: avcodec.h:1648
static av_cold int vble_decode_close(AVCodecContext *avctx)
Definition: vble.c:175
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:292
uint8_t * val
This array first holds the lengths of vlc symbols and then their value.
Definition: vble.c:43
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:406
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:722
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
common internal api header.
AVCodecContext * avctx
Definition: vble.c:39
void * priv_data
Definition: avcodec.h:1690
static void vble_restore_plane(VBLEContext *ctx, AVFrame *pic, GetBitContext *gb, int plane, int offset, int width, int height)
Definition: vble.c:86
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:253
#define av_freep(p)
static av_cold int vble_decode_init(AVCodecContext *avctx)
Definition: vble.c:183
#define av_malloc_array(a, b)
#define stride
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1556
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:955