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{
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  if (get_bits_left(&ctx->gb) <= 0)
83  return AVERROR_INVALIDDATA;
84  while (out < width) {
85  int c = ir2_get_code(&ctx->gb);
86  if (c >= 0x80) { /* we have a skip */
87  c -= 0x7F;
88  if (out + c*2 > width)
89  return AVERROR_INVALIDDATA;
90  for (i = 0; i < c * 2; i++) {
91  dst[out] = dst[out - pitch];
92  out++;
93  }
94  } else { /* add two deltas from table */
95  int t;
96  if (c <= 0)
97  return AVERROR_INVALIDDATA;
98  t = dst[out - pitch] + (table[c * 2] - 128);
99  t = av_clip_uint8(t);
100  dst[out] = t;
101  out++;
102  t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
103  t = av_clip_uint8(t);
104  dst[out] = t;
105  out++;
106  }
107  }
108  dst += pitch;
109  }
110  return 0;
111 }
112 
114  int pitch, const uint8_t *table)
115 {
116  int j;
117  int out = 0;
118  int c;
119  int t;
120 
121  if (width & 1)
122  return AVERROR_INVALIDDATA;
123 
124  for (j = 0; j < height; j++) {
125  out = 0;
126  if (get_bits_left(&ctx->gb) <= 0)
127  return AVERROR_INVALIDDATA;
128  while (out < width) {
129  c = ir2_get_code(&ctx->gb);
130  if (c >= 0x80) { /* we have a skip */
131  c -= 0x7F;
132  out += c * 2;
133  } else { /* add two deltas from table */
134  if (c <= 0)
135  return AVERROR_INVALIDDATA;
136  t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
137  t = av_clip_uint8(t);
138  dst[out] = t;
139  out++;
140  t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
141  t = av_clip_uint8(t);
142  dst[out] = t;
143  out++;
144  }
145  }
146  dst += pitch;
147  }
148  return 0;
149 }
150 
152  void *data, int *got_frame,
153  AVPacket *avpkt)
154 {
155  Ir2Context * const s = avctx->priv_data;
156  const uint8_t *buf = avpkt->data;
157  int buf_size = avpkt->size;
158  AVFrame *picture = data;
159  AVFrame * const p = s->picture;
160  int start, ret;
161  int ltab, ctab;
162 
163  if ((ret = ff_reget_buffer(avctx, p)) < 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 #ifndef BITSTREAM_READER_LE
177  for (i = 0; i < buf_size; i++)
178  buf[i] = ff_reverse[buf[i]];
179 #endif
180 
181  if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
182  return ret;
183 
184  ltab = buf[0x22] & 3;
185  ctab = buf[0x22] >> 2;
186 
187  if (ctab > 3) {
188  av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
189  return AVERROR_INVALIDDATA;
190  }
191 
192  if (s->decode_delta) { /* intraframe */
193  if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
194  p->data[0], p->linesize[0],
195  ir2_delta_table[ltab])) < 0)
196  return ret;
197 
198  /* swapped U and V */
199  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
200  p->data[2], p->linesize[2],
201  ir2_delta_table[ctab])) < 0)
202  return ret;
203  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
204  p->data[1], p->linesize[1],
205  ir2_delta_table[ctab])) < 0)
206  return ret;
207  } else { /* interframe */
208  if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
209  p->data[0], p->linesize[0],
210  ir2_delta_table[ltab])) < 0)
211  return ret;
212  /* swapped U and V */
213  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
214  p->data[2], p->linesize[2],
215  ir2_delta_table[ctab])) < 0)
216  return ret;
217  if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
218  p->data[1], p->linesize[1],
219  ir2_delta_table[ctab])) < 0)
220  return ret;
221  }
222 
223  if ((ret = av_frame_ref(picture, p)) < 0)
224  return ret;
225 
226  *got_frame = 1;
227 
228  return buf_size;
229 }
230 
232 {
233  Ir2Context * const ic = avctx->priv_data;
234  static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
235 
236  ic->avctx = avctx;
237 
238  avctx->pix_fmt= AV_PIX_FMT_YUV410P;
239 
240  ic->picture = av_frame_alloc();
241  if (!ic->picture)
242  return AVERROR(ENOMEM);
243 
244  ir2_vlc.table = vlc_tables;
245  ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
246 #ifdef BITSTREAM_READER_LE
247  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
248  &ir2_codes[0][1], 4, 2,
250 #else
251  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
252  &ir2_codes[0][1], 4, 2,
253  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
254 #endif
255 
256  return 0;
257 }
258 
260 {
261  Ir2Context * const ic = avctx->priv_data;
262 
263  av_frame_free(&ic->picture);
264 
265  return 0;
266 }
267 
269  .name = "indeo2",
270  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
271  .type = AVMEDIA_TYPE_VIDEO,
272  .id = AV_CODEC_ID_INDEO2,
273  .priv_data_size = sizeof(Ir2Context),
275  .close = ir2_decode_end,
277  .capabilities = AV_CODEC_CAP_DR1,
278 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:47
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
GetBitContext gb
Definition: indeo2.c:39
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
const uint8_t ff_reverse[256]
Definition: reverse.c:23
int decode_delta
Definition: indeo2.c:40
int size
Definition: avcodec.h:1478
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
AVCodec.
Definition: avcodec.h:3477
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
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:2011
Macro definitions for various function/variable attributes.
static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table)
Definition: indeo2.c:113
AVCodec ff_indeo2_decoder
Definition: indeo2.c:268
static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table)
Definition: indeo2.c:52
uint8_t
#define av_cold
Definition: attributes.h:82
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
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
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
#define height
uint8_t * data
Definition: avcodec.h:1477
bitstream reader API header.
#define av_log(a,...)
static av_cold int ir2_decode_init(AVCodecContext *avctx)
Definition: indeo2.c:231
static const uint16_t table[]
Definition: prosumer.c:206
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: vlc.h:38
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3484
Definition: vlc.h:26
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:259
#define width
int width
picture width / height.
Definition: avcodec.h:1738
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
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
#define INIT_VLC_LE
Definition: vlc.h:54
int table_allocated
Definition: vlc.h:29
#define CODE_VLC_BITS
Definition: indeo2.c:43
Libavcodec external API header.
static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:151
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:299
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:1565
void * buf
Definition: avisynth_c.h:766
AVFrame * picture
Definition: indeo2.c:38
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
#define IR2_CODES
Definition: indeo2data.h:27
static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]
Definition: imc.c:120
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:282
common internal api header.
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:55
void * priv_data
Definition: avcodec.h:1592
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
AVCodecContext * avctx
Definition: indeo2.c:37
static const uint8_t ir2_delta_table[4][256]
Definition: indeo2data.h:67
FILE * out
Definition: movenc.c:54
void INT64 start
Definition: avisynth_c.h:766
#define VLC_TYPE
Definition: vlc.h:24
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
static VLC ir2_vlc
Definition: indeo2.c:44
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
static const uint16_t ir2_codes[IR2_CODES][2]
Definition: indeo2data.h:28