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 "get_bits.h"
33 #include "indeo2data.h"
34 #include "internal.h"
35 #include "mathops.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 
154  void *data, int *got_frame,
155  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 *picture = data;
161  AVFrame * const p = s->picture;
162  int start, ret;
163  int ltab, ctab;
164 
165  if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
166  return ret;
167 
168  start = 48; /* hardcoded for now */
169 
170  if (start >= buf_size) {
171  av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
172  return AVERROR_INVALIDDATA;
173  }
174 
175  s->decode_delta = buf[18];
176 
177  /* decide whether frame uses deltas or not */
178 
179  if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
180  return ret;
181 
182  ltab = buf[0x22] & 3;
183  ctab = buf[0x22] >> 2;
184 
185  if (ctab > 3) {
186  av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
187  return AVERROR_INVALIDDATA;
188  }
189 
190  if (s->decode_delta) { /* intraframe */
191  if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
192  p->data[0], p->linesize[0],
193  ir2_delta_table[ltab])) < 0)
194  return ret;
195 
196  /* swapped U and V */
197  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
198  p->data[2], p->linesize[2],
199  ir2_delta_table[ctab])) < 0)
200  return ret;
201  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
202  p->data[1], p->linesize[1],
203  ir2_delta_table[ctab])) < 0)
204  return ret;
205  } else { /* interframe */
206  if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
207  p->data[0], p->linesize[0],
208  ir2_delta_table[ltab])) < 0)
209  return ret;
210  /* swapped U and V */
211  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
212  p->data[2], p->linesize[2],
213  ir2_delta_table[ctab])) < 0)
214  return ret;
215  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
216  p->data[1], p->linesize[1],
217  ir2_delta_table[ctab])) < 0)
218  return ret;
219  }
220 
221  if ((ret = av_frame_ref(picture, p)) < 0)
222  return ret;
223 
224  *got_frame = 1;
225 
226  return buf_size;
227 }
228 
229 static av_cold void ir2_init_static(void)
230 {
232  &ir2_tab[0][1], 2, &ir2_tab[0][0], 2, 1,
234 }
235 
237 {
238  static AVOnce init_static_once = AV_ONCE_INIT;
239  Ir2Context * const ic = avctx->priv_data;
240 
241  ic->avctx = avctx;
242 
243  avctx->pix_fmt= AV_PIX_FMT_YUV410P;
244 
245  ic->picture = av_frame_alloc();
246  if (!ic->picture)
247  return AVERROR(ENOMEM);
248 
249  ff_thread_once(&init_static_once, ir2_init_static);
250 
251  return 0;
252 }
253 
255 {
256  Ir2Context * const ic = avctx->priv_data;
257 
258  av_frame_free(&ic->picture);
259 
260  return 0;
261 }
262 
264  .name = "indeo2",
265  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
266  .type = AVMEDIA_TYPE_VIDEO,
267  .id = AV_CODEC_ID_INDEO2,
268  .priv_data_size = sizeof(Ir2Context),
270  .close = ir2_decode_end,
272  .capabilities = AV_CODEC_CAP_DR1,
273  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
274 };
AVCodec
AVCodec.
Definition: codec.h:202
FF_CODEC_CAP_INIT_THREADSAFE
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:42
IR2_CODES
#define IR2_CODES
Definition: indeo2data.h:27
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
ff_indeo2_decoder
const AVCodec ff_indeo2_decoder
Definition: indeo2.c:263
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:850
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:93
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:112
ir2_vlc
static VLC ir2_vlc
Definition: indeo2.c:45
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
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:373
table
static const uint16_t table[]
Definition: prosumer.c:206
data
const char data[16]
Definition: mxf.c:143
Ir2Context::gb
GetBitContext gb
Definition: indeo2.c:40
get_vlc2
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:798
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
ir2_decode_end
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:254
GetBitContext
Definition: get_bits.h:62
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:99
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:175
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:678
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:257
ctx
AVFormatContext * ctx
Definition: movenc.c:48
get_bits.h
ir2_get_code
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:48
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:173
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:126
mathops.h
ir2_init_static
static av_cold void ir2_init_static(void)
Definition: indeo2.c:229
AVOnce
#define AVOnce
Definition: thread.h:172
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:374
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: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:327
Ir2Context::picture
AVFrame * picture
Definition: indeo2.c:39
height
#define height
attributes.h
Ir2Context
Definition: indeo2.c:37
i
int i
Definition: input.c:406
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
AVCodecContext::height
int height
Definition: avcodec.h:556
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:593
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:1759
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:383
ir2_decode_frame
static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:153
VLC
Definition: vlc.h:26
av_clip_uint8
#define av_clip_uint8
Definition: common.h:102
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:236
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:410
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:556
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
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:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
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