indeo2.c
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1 /*
2  * Intel Indeo 2 codec
3  * Copyright (c) 2005 Konstantin Shishkov
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
26 #define BITSTREAM_READER_LE
27 #include "avcodec.h"
28 #include "get_bits.h"
29 #include "indeo2data.h"
30 #include "libavutil/common.h"
31 
32 typedef struct Ir2Context{
37 } Ir2Context;
38 
39 #define CODE_VLC_BITS 14
40 static VLC ir2_vlc;
41 
42 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
43 static inline int ir2_get_code(GetBitContext *gb)
44 {
45  return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
46 }
47 
48 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
49  const uint8_t *table)
50 {
51  int i;
52  int j;
53  int out = 0;
54  int c;
55  int t;
56 
57  if(width&1)
58  return -1;
59 
60  /* first line contain absolute values, other lines contain deltas */
61  while (out < width){
62  c = ir2_get_code(&ctx->gb);
63  if(c >= 0x80) { /* we have a run */
64  c -= 0x7F;
65  if(out + c*2 > width)
66  return -1;
67  for (i = 0; i < c * 2; i++)
68  dst[out++] = 0x80;
69  } else { /* copy two values from table */
70  dst[out++] = table[c * 2];
71  dst[out++] = table[(c * 2) + 1];
72  }
73  }
74  dst += stride;
75 
76  for (j = 1; j < height; j++){
77  out = 0;
78  while (out < width){
79  c = ir2_get_code(&ctx->gb);
80  if(c >= 0x80) { /* we have a skip */
81  c -= 0x7F;
82  if(out + c*2 > width)
83  return -1;
84  for (i = 0; i < c * 2; i++) {
85  dst[out] = dst[out - stride];
86  out++;
87  }
88  } else { /* add two deltas from table */
89  t = dst[out - stride] + (table[c * 2] - 128);
90  t= av_clip_uint8(t);
91  dst[out] = t;
92  out++;
93  t = dst[out - stride] + (table[(c * 2) + 1] - 128);
94  t= av_clip_uint8(t);
95  dst[out] = t;
96  out++;
97  }
98  }
99  dst += stride;
100  }
101  return 0;
102 }
103 
104 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
105  const uint8_t *table)
106 {
107  int j;
108  int out = 0;
109  int c;
110  int t;
111 
112  if(width&1)
113  return -1;
114 
115  for (j = 0; j < height; j++){
116  out = 0;
117  while (out < width){
118  c = ir2_get_code(&ctx->gb);
119  if(c >= 0x80) { /* we have a skip */
120  c -= 0x7F;
121  out += c * 2;
122  } else { /* add two deltas from table */
123  t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
124  t= av_clip_uint8(t);
125  dst[out] = t;
126  out++;
127  t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
128  t= av_clip_uint8(t);
129  dst[out] = t;
130  out++;
131  }
132  }
133  dst += stride;
134  }
135  return 0;
136 }
137 
139  void *data, int *data_size,
140  AVPacket *avpkt)
141 {
142  const uint8_t *buf = avpkt->data;
143  int buf_size = avpkt->size;
144  Ir2Context * const s = avctx->priv_data;
145  AVFrame *picture = data;
146  AVFrame * const p= (AVFrame*)&s->picture;
147  int start;
148 
149  if(p->data[0])
150  avctx->release_buffer(avctx, p);
151 
152  p->reference = 1;
154  if (avctx->reget_buffer(avctx, p)) {
155  av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
156  return -1;
157  }
158 
159  start = 48; /* hardcoded for now */
160 
161  if (start >= buf_size) {
162  av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
163  return AVERROR_INVALIDDATA;
164  }
165 
166  s->decode_delta = buf[18];
167 
168  /* decide whether frame uses deltas or not */
169 #ifndef BITSTREAM_READER_LE
170  for (i = 0; i < buf_size; i++)
171  buf[i] = av_reverse[buf[i]];
172 #endif
173 
174  init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
175 
176  if (s->decode_delta) { /* intraframe */
177  ir2_decode_plane(s, avctx->width, avctx->height,
178  s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
179  /* swapped U and V */
180  ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
181  s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
182  ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
183  s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
184  } else { /* interframe */
185  ir2_decode_plane_inter(s, avctx->width, avctx->height,
186  s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
187  /* swapped U and V */
188  ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
189  s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
190  ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
191  s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
192  }
193 
194  *picture= *(AVFrame*)&s->picture;
195  *data_size = sizeof(AVPicture);
196 
197  return buf_size;
198 }
199 
201  Ir2Context * const ic = avctx->priv_data;
202  static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
203 
204  ic->avctx = avctx;
205 
206  avctx->pix_fmt= PIX_FMT_YUV410P;
207 
208  ir2_vlc.table = vlc_tables;
209  ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
210 #ifdef BITSTREAM_READER_LE
211  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
212  &ir2_codes[0][1], 4, 2,
214 #else
215  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
216  &ir2_codes[0][1], 4, 2,
217  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
218 #endif
219 
220  return 0;
221 }
222 
224  Ir2Context * const ic = avctx->priv_data;
225  AVFrame *pic = &ic->picture;
226 
227  if (pic->data[0])
228  avctx->release_buffer(avctx, pic);
229 
230  return 0;
231 }
232 
234  .name = "indeo2",
235  .type = AVMEDIA_TYPE_VIDEO,
236  .id = CODEC_ID_INDEO2,
237  .priv_data_size = sizeof(Ir2Context),
241  .capabilities = CODEC_CAP_DR1,
242  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
243 };
const uint8_t av_reverse[256]
Definition: mathematics.c:52
enum PixelFormat pix_fmt
Pixel format, see PIX_FMT_xxx.
Definition: avcodec.h:1426
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:43
#define FF_BUFFER_HINTS_VALID
Definition: avcodec.h:880
Audio Video Frame.
Definition: avcodec.h:985
int buffer_hints
codec suggestion on buffer type if != 0
Definition: avcodec.h:1195
GetBitContext gb
Definition: indeo2.c:35
void(* release_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called to release buffers which were allocated with get_buffer.
Definition: avcodec.h:1737
int decode_delta
Definition: indeo2.c:36
int size
Definition: avcodec.h:909
int width
Definition: rotozoom.c:164
#define VLC_TYPE
Definition: get_bits.h:61
four components are given, that's all.
Definition: avcodec.h:3367
int stride
Definition: mace.c:143
AVCodec.
Definition: avcodec.h:3189
int(* reget_buffer)(struct AVCodecContext *c, AVFrame *pic)
Called at the beginning of a frame to get cr buffer for it.
Definition: avcodec.h:2336
AVCodec ff_indeo2_decoder
Definition: indeo2.c:233
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:228
#define av_cold
Definition: attributes.h:71
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:70
const char data[16]
Definition: mxf.c:60
uint8_t * data
Definition: avcodec.h:908
bitstream reader API header.
static av_cold int ir2_decode_init(AVCodecContext *avctx)
Definition: indeo2.c:200
static float t
static int init(AVCodecParserContext *s)
Definition: h264_parser.c:336
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:719
int reference
is this picture used as reference The values for this are the same as the MpegEncContext.picture_structure variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
Definition: avcodec.h:1074
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:191
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:140
const char * name
Name of the codec implementation.
Definition: avcodec.h:3196
Definition: get_bits.h:63
struct Ir2Context Ir2Context
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:223
static AVFrame * picture
int width
picture width / height.
Definition: avcodec.h:1408
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:481
AVFrame picture
Definition: indeo2.c:34
#define INIT_VLC_USE_NEW_STATIC
Definition: get_bits.h:399
#define FF_BUFFER_HINTS_REUSABLE
Definition: avcodec.h:883
int table_allocated
Definition: get_bits.h:66
#define CODE_VLC_BITS
Definition: indeo2.c:39
external API header
static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride, const uint8_t *table)
Definition: indeo2.c:48
int linesize[AV_NUM_DATA_POINTERS]
Size, in bytes, of the data for each picture/channel plane.
Definition: avcodec.h:1008
main external API structure.
Definition: avcodec.h:1329
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:327
static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride, const uint8_t *table)
Definition: indeo2.c:104
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:111
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: get_bits.h:384
#define INIT_VLC_LE
Definition: get_bits.h:398
#define IR2_CODES
Definition: indeo2data.h:27
#define FF_BUFFER_HINTS_PRESERVE
Definition: avcodec.h:882
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:354
static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]
Definition: imc.c:105
static const uint8_t ir2_luma_table[256]
Definition: indeo2data.h:106
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: avcodec.h:997
int height
Definition: gxfenc.c:73
common internal and external API header
void * priv_data
Definition: avcodec.h:1531
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
AVCodecContext * avctx
Definition: indeo2.c:33
static VLC ir2_vlc
Definition: indeo2.c:40
static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
Definition: indeo2.c:138
static const uint16_t ir2_codes[IR2_CODES][2]
Definition: indeo2data.h:28