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 
29 #define BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "indeo2data.h"
33 #include "internal.h"
34 #include "mathops.h"
35 
36 typedef struct Ir2Context{
37  AVCodecContext *avctx;
38  AVFrame *picture;
39  GetBitContext gb;
40  int decode_delta;
41 } Ir2Context;
42 
43 #define CODE_VLC_BITS 14
44 static VLC ir2_vlc;
45 
46 /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
47 static inline int ir2_get_code(GetBitContext *gb)
48 {
49  return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
50 }
51 
52 static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
53  int pitch, const uint8_t *table)
54 {
55  int i;
56  int j;
57  int out = 0;
58 
59  if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
60  return AVERROR_INVALIDDATA;
61 
62  /* first line contain absolute values, other lines contain deltas */
63  while (out < width) {
64  int c = ir2_get_code(&ctx->gb);
65  if (c >= 0x80) { /* we have a run */
66  c -= 0x7F;
67  if (out + c*2 > width)
68  return AVERROR_INVALIDDATA;
69  for (i = 0; i < c * 2; i++)
70  dst[out++] = 0x80;
71  } else { /* copy two values from table */
72  if (c <= 0)
73  return AVERROR_INVALIDDATA;
74  dst[out++] = table[c * 2];
75  dst[out++] = table[(c * 2) + 1];
76  }
77  }
78  dst += pitch;
79 
80  for (j = 1; j < height; j++) {
81  out = 0;
82  while (out < width) {
83  int c;
84  if (get_bits_left(&ctx->gb) <= 0)
85  return AVERROR_INVALIDDATA;
86  c = ir2_get_code(&ctx->gb);
87  if (c >= 0x80) { /* we have a skip */
88  c -= 0x7F;
89  if (out + c*2 > width)
90  return AVERROR_INVALIDDATA;
91  for (i = 0; i < c * 2; i++) {
92  dst[out] = dst[out - pitch];
93  out++;
94  }
95  } else { /* add two deltas from table */
96  int t;
97  if (c <= 0)
98  return AVERROR_INVALIDDATA;
99  t = dst[out - pitch] + (table[c * 2] - 128);
100  t = av_clip_uint8(t);
101  dst[out] = t;
102  out++;
103  t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
104  t = av_clip_uint8(t);
105  dst[out] = t;
106  out++;
107  }
108  }
109  dst += pitch;
110  }
111  return 0;
112 }
113 
114 static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
115  int pitch, const uint8_t *table)
116 {
117  int j;
118  int out = 0;
119  int c;
120  int t;
121 
122  if (width & 1)
123  return AVERROR_INVALIDDATA;
124 
125  for (j = 0; j < height; j++) {
126  out = 0;
127  while (out < width) {
128  if (get_bits_left(&ctx->gb) <= 0)
129  return AVERROR_INVALIDDATA;
130  c = ir2_get_code(&ctx->gb);
131  if (c >= 0x80) { /* we have a skip */
132  c -= 0x7F;
133  out += c * 2;
134  } else { /* add two deltas from table */
135  if (c <= 0)
136  return AVERROR_INVALIDDATA;
137  t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
138  t = av_clip_uint8(t);
139  dst[out] = t;
140  out++;
141  t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
142  t = av_clip_uint8(t);
143  dst[out] = t;
144  out++;
145  }
146  }
147  dst += pitch;
148  }
149  return 0;
150 }
151 
152 static int ir2_decode_frame(AVCodecContext *avctx,
153  void *data, int *got_frame,
154  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 *picture = data;
160  AVFrame * const p = s->picture;
161  int start, ret;
162  int ltab, ctab;
163 
164  if ((ret = ff_reget_buffer(avctx, p)) < 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 #ifndef BITSTREAM_READER_LE
178  for (i = 0; i < buf_size; i++)
179  buf[i] = ff_reverse[buf[i]];
180 #endif
181 
182  if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
183  return ret;
184 
185  ltab = buf[0x22] & 3;
186  ctab = buf[0x22] >> 2;
187 
188  if (ctab > 3) {
189  av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
190  return AVERROR_INVALIDDATA;
191  }
192 
193  if (s->decode_delta) { /* intraframe */
194  if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
195  p->data[0], p->linesize[0],
196  ir2_delta_table[ltab])) < 0)
197  return ret;
198 
199  /* swapped U and V */
200  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
201  p->data[2], p->linesize[2],
202  ir2_delta_table[ctab])) < 0)
203  return ret;
204  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
205  p->data[1], p->linesize[1],
206  ir2_delta_table[ctab])) < 0)
207  return ret;
208  } else { /* interframe */
209  if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
210  p->data[0], p->linesize[0],
211  ir2_delta_table[ltab])) < 0)
212  return ret;
213  /* swapped U and V */
214  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
215  p->data[2], p->linesize[2],
216  ir2_delta_table[ctab])) < 0)
217  return ret;
218  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
219  p->data[1], p->linesize[1],
220  ir2_delta_table[ctab])) < 0)
221  return ret;
222  }
223 
224  if ((ret = av_frame_ref(picture, p)) < 0)
225  return ret;
226 
227  *got_frame = 1;
228 
229  return buf_size;
230 }
231 
232 static av_cold int ir2_decode_init(AVCodecContext *avctx)
233 {
234  Ir2Context * const ic = avctx->priv_data;
235  static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
236 
237  ic->avctx = avctx;
238 
239  avctx->pix_fmt= AV_PIX_FMT_YUV410P;
240 
241  ic->picture = av_frame_alloc();
242  if (!ic->picture)
243  return AVERROR(ENOMEM);
244 
245  ir2_vlc.table = vlc_tables;
246  ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
247 #ifdef BITSTREAM_READER_LE
248  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
249  &ir2_codes[0][1], 4, 2,
250  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
251 #else
252  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
253  &ir2_codes[0][1], 4, 2,
254  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
255 #endif
256 
257  return 0;
258 }
259 
260 static av_cold int ir2_decode_end(AVCodecContext *avctx)
261 {
262  Ir2Context * const ic = avctx->priv_data;
263 
264  av_frame_free(&ic->picture);
265 
266  return 0;
267 }
268 
269 AVCodec ff_indeo2_decoder = {
270  .name = "indeo2",
271  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
272  .type = AVMEDIA_TYPE_VIDEO,
273  .id = AV_CODEC_ID_INDEO2,
274  .priv_data_size = sizeof(Ir2Context),
275  .init = ir2_decode_init,
276  .close = ir2_decode_end,
277  .decode = ir2_decode_frame,
278  .capabilities = AV_CODEC_CAP_DR1,
279 };
AVCodec
AVCodec.
Definition: avcodec.h:3481
IR2_CODES
#define IR2_CODES
Definition: indeo2data.h:27
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
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:114
out
FILE * out
Definition: movenc.c:54
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:202
ir2_vlc
static VLC ir2_vlc
Definition: indeo2.c:44
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
ir2_delta_table
static const uint8_t ir2_delta_table[4][256]
Definition: indeo2data.h:67
internal.h
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
init_vlc
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
ff_reverse
const uint8_t ff_reverse[256]
Definition: reverse.c:23
table
static const uint16_t table[]
Definition: prosumer.c:206
data
const char data[16]
Definition: mxf.c:91
Ir2Context::gb
GetBitContext gb
Definition: indeo2.c:39
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:797
ff_reget_buffer
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: decode.c:2012
INIT_VLC_LE
#define INIT_VLC_LE
Definition: vlc.h:54
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
ir2_decode_end
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:260
VLC_TYPE
#define VLC_TYPE
Definition: vlc.h:24
start
void INT64 start
Definition: avisynth_c.h:767
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:189
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
buf
void * buf
Definition: avisynth_c.h:766
av_cold
#define av_cold
Definition: attributes.h:84
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
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:47
mathops.h
INIT_VLC_USE_NEW_STATIC
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:55
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
VLC::table_allocated
int table_allocated
Definition: vlc.h:29
AV_CODEC_ID_INDEO2
@ AV_CODEC_ID_INDEO2
Definition: avcodec.h:293
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
AVPacket::size
int size
Definition: avcodec.h:1478
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:188
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:52
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:443
vlc_tables
static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]
Definition: imc.c:120
Ir2Context::picture
AVFrame * picture
Definition: indeo2.c:38
height
#define height
attributes.h
Ir2Context
Definition: indeo2.c:36
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
AVCodecContext::height
int height
Definition: avcodec.h:1738
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
ir2_codes
static const uint16_t ir2_codes[IR2_CODES][2]
Definition: indeo2data.h:28
avcodec.h
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:1565
ir2_decode_frame
static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:152
VLC
Definition: vlc.h:26
ff_indeo2_decoder
AVCodec ff_indeo2_decoder
Definition: indeo2.c:269
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:232
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1592
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1738
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:326
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:59
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
Ir2Context::avctx
AVCodecContext * avctx
Definition: indeo2.c:37
CODE_VLC_BITS
#define CODE_VLC_BITS
Definition: indeo2.c:43
Ir2Context::decode_delta
int decode_delta
Definition: indeo2.c:40
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