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 "decode.h"
34 #include "get_bits.h"
35 #include "indeo2data.h"
36 
37 typedef struct Ir2Context{
42 } Ir2Context;
43 
44 #define CODE_VLC_BITS 14
45 static VLC ir2_vlc;
46 
47 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
48 static inline int ir2_get_code(GetBitContext *gb)
49 {
50  return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1);
51 }
52 
53 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
54  int pitch, const uint8_t *table)
55 {
56  int i;
57  int j;
58  int out = 0;
59 
60  if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
61  return AVERROR_INVALIDDATA;
62 
63  /* first line contain absolute values, other lines contain deltas */
64  while (out < width) {
65  int c = ir2_get_code(&ctx->gb);
66  if (c >= 0x80) { /* we have a run */
67  c -= 0x7F;
68  if (out + c*2 > width)
69  return AVERROR_INVALIDDATA;
70  for (i = 0; i < c * 2; i++)
71  dst[out++] = 0x80;
72  } else { /* copy two values from table */
73  if (c <= 0)
74  return AVERROR_INVALIDDATA;
75  dst[out++] = table[c * 2];
76  dst[out++] = table[(c * 2) + 1];
77  }
78  }
79  dst += pitch;
80 
81  for (j = 1; j < height; j++) {
82  out = 0;
83  while (out < width) {
84  int c;
85  if (get_bits_left(&ctx->gb) <= 0)
86  return AVERROR_INVALIDDATA;
87  c = ir2_get_code(&ctx->gb);
88  if (c >= 0x80) { /* we have a skip */
89  c -= 0x7F;
90  if (out + c*2 > width)
91  return AVERROR_INVALIDDATA;
92  for (i = 0; i < c * 2; i++) {
93  dst[out] = dst[out - pitch];
94  out++;
95  }
96  } else { /* add two deltas from table */
97  int t;
98  if (c <= 0)
99  return AVERROR_INVALIDDATA;
100  t = dst[out - pitch] + (table[c * 2] - 128);
101  t = av_clip_uint8(t);
102  dst[out] = t;
103  out++;
104  t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
105  t = av_clip_uint8(t);
106  dst[out] = t;
107  out++;
108  }
109  }
110  dst += pitch;
111  }
112  return 0;
113 }
114 
115 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
116  int pitch, const uint8_t *table)
117 {
118  int j;
119  int out = 0;
120  int c;
121  int t;
122 
123  if (width & 1)
124  return AVERROR_INVALIDDATA;
125 
126  for (j = 0; j < height; j++) {
127  out = 0;
128  while (out < width) {
129  if (get_bits_left(&ctx->gb) <= 0)
130  return AVERROR_INVALIDDATA;
131  c = ir2_get_code(&ctx->gb);
132  if (c >= 0x80) { /* we have a skip */
133  c -= 0x7F;
134  out += c * 2;
135  } else { /* add two deltas from table */
136  if (c <= 0)
137  return AVERROR_INVALIDDATA;
138  t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
139  t = av_clip_uint8(t);
140  dst[out] = t;
141  out++;
142  t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
143  t = av_clip_uint8(t);
144  dst[out] = t;
145  out++;
146  }
147  }
148  dst += pitch;
149  }
150  return 0;
151 }
152 
153 static int ir2_decode_frame(AVCodecContext *avctx, AVFrame *picture,
154  int *got_frame, AVPacket *avpkt)
155 {
156  Ir2Context * const s = avctx->priv_data;
157  const uint8_t *buf = avpkt->data;
158  int buf_size = avpkt->size;
159  AVFrame * const p = s->picture;
160  int start, ret;
161  int ltab, ctab;
162 
163  if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
164  return ret;
165 
166  start = 48; /* hardcoded for now */
167 
168  if (start >= buf_size) {
169  av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
170  return AVERROR_INVALIDDATA;
171  }
172 
173  s->decode_delta = buf[18];
174 
175  /* decide whether frame uses deltas or not */
176 
177  if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
178  return ret;
179 
180  ltab = buf[0x22] & 3;
181  ctab = buf[0x22] >> 2;
182 
183  if (ctab > 3) {
184  av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
185  return AVERROR_INVALIDDATA;
186  }
187 
188  if (s->decode_delta) { /* intraframe */
189  if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
190  p->data[0], p->linesize[0],
191  ir2_delta_table[ltab])) < 0)
192  return ret;
193 
194  /* swapped U and V */
195  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
196  p->data[2], p->linesize[2],
197  ir2_delta_table[ctab])) < 0)
198  return ret;
199  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
200  p->data[1], p->linesize[1],
201  ir2_delta_table[ctab])) < 0)
202  return ret;
203  } else { /* interframe */
204  if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
205  p->data[0], p->linesize[0],
206  ir2_delta_table[ltab])) < 0)
207  return ret;
208  /* swapped U and V */
209  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
210  p->data[2], p->linesize[2],
211  ir2_delta_table[ctab])) < 0)
212  return ret;
213  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
214  p->data[1], p->linesize[1],
215  ir2_delta_table[ctab])) < 0)
216  return ret;
217  }
218 
219  if ((ret = av_frame_ref(picture, p)) < 0)
220  return ret;
221 
222  *got_frame = 1;
223 
224  return buf_size;
225 }
226 
227 static av_cold void ir2_init_static(void)
228 {
230  &ir2_tab[0][1], 2, &ir2_tab[0][0], 2, 1,
232 }
233 
235 {
236  static AVOnce init_static_once = AV_ONCE_INIT;
237  Ir2Context * const ic = avctx->priv_data;
238 
239  ic->avctx = avctx;
240 
241  avctx->pix_fmt= AV_PIX_FMT_YUV410P;
242 
243  ic->picture = av_frame_alloc();
244  if (!ic->picture)
245  return AVERROR(ENOMEM);
246 
247  ff_thread_once(&init_static_once, ir2_init_static);
248 
249  return 0;
250 }
251 
253 {
254  Ir2Context * const ic = avctx->priv_data;
255 
256  av_frame_free(&ic->picture);
257 
258  return 0;
259 }
260 
262  .p.name = "indeo2",
263  CODEC_LONG_NAME("Intel Indeo 2"),
264  .p.type = AVMEDIA_TYPE_VIDEO,
265  .p.id = AV_CODEC_ID_INDEO2,
266  .priv_data_size = sizeof(Ir2Context),
268  .close = ir2_decode_end,
270  .p.capabilities = AV_CODEC_CAP_DR1,
271 };
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:115
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:45
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
AVPacket::data
uint8_t * data
Definition: packet.h:374
table
static const uint16_t table[]
Definition: prosumer.c:205
Ir2Context::gb
GetBitContext gb
Definition: indeo2.c:40
ir2_decode_frame
static int ir2_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:153
FFCodec
Definition: codec_internal.h:119
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
ir2_decode_end
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:252
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:123
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:184
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:298
s
#define s(width, name)
Definition: cbs_vp9.c:256
ff_indeo2_decoder
const FFCodec ff_indeo2_decoder
Definition: indeo2.c:261
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts_bsf.c:363
ctx
AVFormatContext * ctx
Definition: movenc.c:48
decode.h
get_bits.h
ir2_get_code
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:48
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:264
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:182
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
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:227
AVOnce
#define AVOnce
Definition: thread.h:181
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:127
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
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:53
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:39
height
#define height
attributes.h
Ir2Context
Definition: indeo2.c:37
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:1538
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:234
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:38
CODE_VLC_BITS
#define CODE_VLC_BITS
Definition: indeo2.c:44
Ir2Context::decode_delta
int decode_delta
Definition: indeo2.c:41