FFmpeg
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 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  * Intel Indeo 2 decoder.
25  */
26 
27 #include "libavutil/attributes.h"
28 #include "libavutil/thread.h"
29 
30 #define BITSTREAM_READER_LE
31 #include "avcodec.h"
32 #include "codec_internal.h"
33 #include "get_bits.h"
34 #include "indeo2data.h"
35 #include "internal.h"
36 #include "mathops.h"
37 
38 typedef struct Ir2Context{
43 } Ir2Context;
44 
45 #define CODE_VLC_BITS 14
46 static VLC ir2_vlc;
47 
48 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
49 static inline int ir2_get_code(GetBitContext *gb)
50 {
51  return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1);
52 }
53 
54 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
55  int pitch, const uint8_t *table)
56 {
57  int i;
58  int j;
59  int out = 0;
60 
61  if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
62  return AVERROR_INVALIDDATA;
63 
64  /* first line contain absolute values, other lines contain deltas */
65  while (out < width) {
66  int c = ir2_get_code(&ctx->gb);
67  if (c >= 0x80) { /* we have a run */
68  c -= 0x7F;
69  if (out + c*2 > width)
70  return AVERROR_INVALIDDATA;
71  for (i = 0; i < c * 2; i++)
72  dst[out++] = 0x80;
73  } else { /* copy two values from table */
74  if (c <= 0)
75  return AVERROR_INVALIDDATA;
76  dst[out++] = table[c * 2];
77  dst[out++] = table[(c * 2) + 1];
78  }
79  }
80  dst += pitch;
81 
82  for (j = 1; j < height; j++) {
83  out = 0;
84  while (out < width) {
85  int c;
86  if (get_bits_left(&ctx->gb) <= 0)
87  return AVERROR_INVALIDDATA;
88  c = ir2_get_code(&ctx->gb);
89  if (c >= 0x80) { /* we have a skip */
90  c -= 0x7F;
91  if (out + c*2 > width)
92  return AVERROR_INVALIDDATA;
93  for (i = 0; i < c * 2; i++) {
94  dst[out] = dst[out - pitch];
95  out++;
96  }
97  } else { /* add two deltas from table */
98  int t;
99  if (c <= 0)
100  return AVERROR_INVALIDDATA;
101  t = dst[out - pitch] + (table[c * 2] - 128);
102  t = av_clip_uint8(t);
103  dst[out] = t;
104  out++;
105  t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
106  t = av_clip_uint8(t);
107  dst[out] = t;
108  out++;
109  }
110  }
111  dst += pitch;
112  }
113  return 0;
114 }
115 
116 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
117  int pitch, const uint8_t *table)
118 {
119  int j;
120  int out = 0;
121  int c;
122  int t;
123 
124  if (width & 1)
125  return AVERROR_INVALIDDATA;
126 
127  for (j = 0; j < height; j++) {
128  out = 0;
129  while (out < width) {
130  if (get_bits_left(&ctx->gb) <= 0)
131  return AVERROR_INVALIDDATA;
132  c = ir2_get_code(&ctx->gb);
133  if (c >= 0x80) { /* we have a skip */
134  c -= 0x7F;
135  out += c * 2;
136  } else { /* add two deltas from table */
137  if (c <= 0)
138  return AVERROR_INVALIDDATA;
139  t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
140  t = av_clip_uint8(t);
141  dst[out] = t;
142  out++;
143  t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
144  t = av_clip_uint8(t);
145  dst[out] = t;
146  out++;
147  }
148  }
149  dst += pitch;
150  }
151  return 0;
152 }
153 
154 static int ir2_decode_frame(AVCodecContext *avctx, AVFrame *picture,
155  int *got_frame, AVPacket *avpkt)
156 {
157  Ir2Context * const s = avctx->priv_data;
158  const uint8_t *buf = avpkt->data;
159  int buf_size = avpkt->size;
160  AVFrame * const p = s->picture;
161  int start, ret;
162  int ltab, ctab;
163 
164  if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
165  return ret;
166 
167  start = 48; /* hardcoded for now */
168 
169  if (start >= buf_size) {
170  av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
171  return AVERROR_INVALIDDATA;
172  }
173 
174  s->decode_delta = buf[18];
175 
176  /* decide whether frame uses deltas or not */
177 
178  if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
179  return ret;
180 
181  ltab = buf[0x22] & 3;
182  ctab = buf[0x22] >> 2;
183 
184  if (ctab > 3) {
185  av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
186  return AVERROR_INVALIDDATA;
187  }
188 
189  if (s->decode_delta) { /* intraframe */
190  if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
191  p->data[0], p->linesize[0],
192  ir2_delta_table[ltab])) < 0)
193  return ret;
194 
195  /* swapped U and V */
196  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
197  p->data[2], p->linesize[2],
198  ir2_delta_table[ctab])) < 0)
199  return ret;
200  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
201  p->data[1], p->linesize[1],
202  ir2_delta_table[ctab])) < 0)
203  return ret;
204  } else { /* interframe */
205  if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
206  p->data[0], p->linesize[0],
207  ir2_delta_table[ltab])) < 0)
208  return ret;
209  /* swapped U and V */
210  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
211  p->data[2], p->linesize[2],
212  ir2_delta_table[ctab])) < 0)
213  return ret;
214  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
215  p->data[1], p->linesize[1],
216  ir2_delta_table[ctab])) < 0)
217  return ret;
218  }
219 
220  if ((ret = av_frame_ref(picture, p)) < 0)
221  return ret;
222 
223  *got_frame = 1;
224 
225  return buf_size;
226 }
227 
228 static av_cold void ir2_init_static(void)
229 {
231  &ir2_tab[0][1], 2, &ir2_tab[0][0], 2, 1,
233 }
234 
236 {
237  static AVOnce init_static_once = AV_ONCE_INIT;
238  Ir2Context * const ic = avctx->priv_data;
239 
240  ic->avctx = avctx;
241 
242  avctx->pix_fmt= AV_PIX_FMT_YUV410P;
243 
244  ic->picture = av_frame_alloc();
245  if (!ic->picture)
246  return AVERROR(ENOMEM);
247 
248  ff_thread_once(&init_static_once, ir2_init_static);
249 
250  return 0;
251 }
252 
254 {
255  Ir2Context * const ic = avctx->priv_data;
256 
257  av_frame_free(&ic->picture);
258 
259  return 0;
260 }
261 
263  .p.name = "indeo2",
264  .p.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
265  .p.type = AVMEDIA_TYPE_VIDEO,
266  .p.id = AV_CODEC_ID_INDEO2,
267  .priv_data_size = sizeof(Ir2Context),
269  .close = ir2_decode_end,
271  .p.capabilities = AV_CODEC_CAP_DR1,
272 };
IR2_CODES
#define IR2_CODES
Definition: indeo2data.h:27
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:839
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
ir2_decode_plane_inter
static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table)
Definition: indeo2.c:116
out
FILE * out
Definition: movenc.c:54
INIT_VLC_OUTPUT_LE
#define INIT_VLC_OUTPUT_LE
Definition: vlc.h:98
thread.h
indeo2data.h
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:116
ir2_vlc
static VLC ir2_vlc
Definition: indeo2.c:46
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
ir2_delta_table
static const uint8_t ir2_delta_table[4][256]
Definition: indeo2data.h:60
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
table
static const uint16_t table[]
Definition: prosumer.c:206
Ir2Context::gb
GetBitContext gb
Definition: indeo2.c:41
ir2_decode_frame
static int ir2_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:154
FFCodec
Definition: codec_internal.h:118
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
init
static int init
Definition: av_tx.c:47
ir2_decode_end
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:253
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
GetBitContext
Definition: get_bits.h:61
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:104
ir2_tab
static const uint8_t ir2_tab[IR2_CODES][2]
Definition: indeo2data.h:28
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:179
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
av_cold
#define av_cold
Definition: attributes.h:90
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:667
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:260
s
#define s(width, name)
Definition: cbs_vp9.c:256
ff_indeo2_decoder
const FFCodec ff_indeo2_decoder
Definition: indeo2.c:262
ctx
AVFormatContext * ctx
Definition: movenc.c:48
get_bits.h
ir2_get_code
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:49
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:177
INIT_VLC_STATIC_FROM_LENGTHS
#define INIT_VLC_STATIC_FROM_LENGTHS(vlc, bits, nb_codes, lens, len_wrap, symbols, symbols_wrap, symbols_size, offset, flags, static_size)
Definition: vlc.h:131
mathops.h
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:787
ir2_init_static
static av_cold void ir2_init_static(void)
Definition: indeo2.c:228
AVOnce
#define AVOnce
Definition: thread.h:176
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
AV_CODEC_ID_INDEO2
@ AV_CODEC_ID_INDEO2
Definition: codec_id.h:125
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
ir2_decode_plane
static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table)
Definition: indeo2.c:54
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:353
codec_internal.h
Ir2Context::picture
AVFrame * picture
Definition: indeo2.c:40
height
#define height
attributes.h
Ir2Context
Definition: indeo2.c:38
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
avcodec.h
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
Definition: decode.c:1580
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:398
VLC
Definition: vlc.h:31
VLC::table
VLCElem * table
Definition: vlc.h:33
av_clip_uint8
#define av_clip_uint8
Definition: common.h:101
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ir2_decode_init
static av_cold int ir2_decode_init(AVCodecContext *avctx)
Definition: indeo2.c:235
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:370
AV_PIX_FMT_YUV410P
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
Ir2Context::avctx
AVCodecContext * avctx
Definition: indeo2.c:39
CODE_VLC_BITS
#define CODE_VLC_BITS
Definition: indeo2.c:45
Ir2Context::decode_delta
int decode_delta
Definition: indeo2.c:42