FFmpeg  4.4.5
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 
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 };
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
uint8_t
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define s(width, name)
Definition: cbs_vp9.c:257
#define av_clip_uint8
Definition: common.h:128
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:2007
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
bitstream reader API header.
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
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
@ AV_CODEC_ID_INDEO2
Definition: codec_id.h:124
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:48
static av_cold void ir2_init_static(void)
Definition: indeo2.c:229
static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table)
Definition: indeo2.c:53
static VLC ir2_vlc
Definition: indeo2.c:45
#define CODE_VLC_BITS
Definition: indeo2.c:44
static av_cold int ir2_decode_init(AVCodecContext *avctx)
Definition: indeo2.c:236
static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:153
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:254
AVCodec ff_indeo2_decoder
Definition: indeo2.c:263
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
static const uint8_t ir2_tab[IR2_CODES][2]
Definition: indeo2data.h:28
#define IR2_CODES
Definition: indeo2data.h:27
static const uint8_t ir2_delta_table[4][256]
Definition: indeo2data.h:60
int i
Definition: input.c:407
#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:41
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define AVOnce
Definition: thread.h:172
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
#define AV_ONCE_INIT
Definition: thread.h:173
const char data[16]
Definition: mxf.c:142
@ AV_PIX_FMT_YUV410P
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:72
static const uint16_t table[]
Definition: prosumer.c:206
main external API structure.
Definition: avcodec.h:536
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
int width
picture width / height.
Definition: avcodec.h:709
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
This structure stores compressed data.
Definition: packet.h:346
int size
Definition: packet.h:370
uint8_t * data
Definition: packet.h:369
AVFrame * picture
Definition: indeo2.c:39
AVCodecContext * avctx
Definition: indeo2.c:38
int decode_delta
Definition: indeo2.c:41
GetBitContext gb
Definition: indeo2.c:40
Definition: vlc.h:26
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
#define av_log(a,...)
FILE * out
Definition: movenc.c:54
AVFormatContext * ctx
Definition: movenc.c:48
#define height
#define width
#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
#define INIT_VLC_OUTPUT_LE
Definition: vlc.h:93
static double c[64]