FFmpeg  4.3.6
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  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 
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 
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)) < 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 
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,
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 
261 {
262  Ir2Context * const ic = avctx->priv_data;
263 
264  av_frame_free(&ic->picture);
265 
266  return 0;
267 }
268 
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),
276  .close = ir2_decode_end,
278  .capabilities = AV_CODEC_CAP_DR1,
279 };
#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:300
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: packet.h:356
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
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:114
AVCodec ff_indeo2_decoder
Definition: indeo2.c:269
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:88
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
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:444
const char data[16]
Definition: mxf.c:91
#define height
uint8_t * data
Definition: packet.h:355
bitstream reader API header.
#define av_log(a,...)
static av_cold int ir2_decode_init(AVCodecContext *avctx)
Definition: indeo2.c:232
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:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:188
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:1961
const char * name
Name of the codec implementation.
Definition: codec.h:197
Definition: vlc.h:26
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:260
#define width
int width
picture width / height.
Definition: avcodec.h:699
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:152
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
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:526
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:314
common internal api header.
static double c[64]
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:55
void * priv_data
Definition: avcodec.h:553
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
#define VLC_TYPE
Definition: vlc.h:24
static VLC ir2_vlc
Definition: indeo2.c:44
This structure stores compressed data.
Definition: packet.h:332
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
static const uint16_t ir2_codes[IR2_CODES][2]
Definition: indeo2data.h:28