Libav
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 Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
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  int c;
59  int t;
60 
61  if (width & 1)
62  return AVERROR_INVALIDDATA;
63 
64  /* first line contain absolute values, other lines contain deltas */
65  while (out < width) {
66  c = ir2_get_code(&ctx->gb);
67  if (c >= 0x80) { /* we have a run */
68  c -= 0x7F;
69  if (out + c*2 > width)
70  return AVERROR_INVALIDDATA;
71  for (i = 0; i < c * 2; i++)
72  dst[out++] = 0x80;
73  } else { /* copy two values from table */
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  c = ir2_get_code(&ctx->gb);
84  if (c >= 0x80) { /* we have a skip */
85  c -= 0x7F;
86  if (out + c*2 > width)
87  return AVERROR_INVALIDDATA;
88  for (i = 0; i < c * 2; i++) {
89  dst[out] = dst[out - pitch];
90  out++;
91  }
92  } else { /* add two deltas from table */
93  t = dst[out - pitch] + (table[c * 2] - 128);
94  t = av_clip_uint8(t);
95  dst[out] = t;
96  out++;
97  t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
98  t = av_clip_uint8(t);
99  dst[out] = t;
100  out++;
101  }
102  }
103  dst += pitch;
104  }
105  return 0;
106 }
107 
109  int pitch, const uint8_t *table)
110 {
111  int j;
112  int out = 0;
113  int c;
114  int t;
115 
116  if (width & 1)
117  return AVERROR_INVALIDDATA;
118 
119  for (j = 0; j < height; j++) {
120  out = 0;
121  while (out < width) {
122  c = ir2_get_code(&ctx->gb);
123  if (c >= 0x80) { /* we have a skip */
124  c -= 0x7F;
125  out += c * 2;
126  } else { /* add two deltas from table */
127  t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
128  t = av_clip_uint8(t);
129  dst[out] = t;
130  out++;
131  t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
132  t = av_clip_uint8(t);
133  dst[out] = t;
134  out++;
135  }
136  }
137  dst += pitch;
138  }
139  return 0;
140 }
141 
143  void *data, int *got_frame,
144  AVPacket *avpkt)
145 {
146  Ir2Context * const s = avctx->priv_data;
147  const uint8_t *buf = avpkt->data;
148  int buf_size = avpkt->size;
149  AVFrame *picture = data;
150  AVFrame * const p = s->picture;
151  int start, ret;
152  int ltab, ctab;
153 
154  if ((ret = ff_reget_buffer(avctx, p)) < 0) {
155  av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
156  return ret;
157  }
158 
159  start = 48; /* hardcoded for now */
160 
161  if (start >= buf_size) {
162  av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
163  return AVERROR_INVALIDDATA;
164  }
165 
166  s->decode_delta = buf[18];
167 
168  /* decide whether frame uses deltas or not */
169 #ifndef BITSTREAM_READER_LE
170  for (i = 0; i < buf_size; i++)
171  buf[i] = ff_reverse[buf[i]];
172 #endif
173 
174  init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
175 
176  ltab = buf[0x22] & 3;
177  ctab = buf[0x22] >> 2;
178  if (s->decode_delta) { /* intraframe */
179  if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
180  p->data[0], p->linesize[0],
181  ir2_delta_table[ltab])) < 0)
182  return ret;
183 
184  /* swapped U and V */
185  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
186  p->data[2], p->linesize[2],
187  ir2_delta_table[ctab])) < 0)
188  return ret;
189  if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
190  p->data[1], p->linesize[1],
191  ir2_delta_table[ctab])) < 0)
192  return ret;
193  } else { /* interframe */
194  if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
195  p->data[0], p->linesize[0],
196  ir2_delta_table[ltab])) < 0)
197  return ret;
198  /* swapped U and V */
199  if ((ret = ir2_decode_plane_inter(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_inter(s, avctx->width >> 2, avctx->height >> 2,
204  p->data[1], p->linesize[1],
205  ir2_delta_table[ctab])) < 0)
206  return ret;
207  }
208 
209  if ((ret = av_frame_ref(picture, p)) < 0)
210  return ret;
211 
212  *got_frame = 1;
213 
214  return buf_size;
215 }
216 
218 {
219  Ir2Context * const ic = avctx->priv_data;
220  static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
221 
222  ic->avctx = avctx;
223 
224  avctx->pix_fmt= AV_PIX_FMT_YUV410P;
225 
226  ic->picture = av_frame_alloc();
227  if (!ic->picture)
228  return AVERROR(ENOMEM);
229 
230  ir2_vlc.table = vlc_tables;
231  ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
232 #ifdef BITSTREAM_READER_LE
233  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
234  &ir2_codes[0][1], 4, 2,
236 #else
237  init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
238  &ir2_codes[0][1], 4, 2,
239  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
240 #endif
241 
242  return 0;
243 }
244 
246 {
247  Ir2Context * const ic = avctx->priv_data;
248 
249  av_frame_free(&ic->picture);
250 
251  return 0;
252 }
253 
255  .name = "indeo2",
256  .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
257  .type = AVMEDIA_TYPE_VIDEO,
258  .id = AV_CODEC_ID_INDEO2,
259  .priv_data_size = sizeof(Ir2Context),
261  .close = ir2_decode_end,
263  .capabilities = AV_CODEC_CAP_DR1,
264 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
static int ir2_get_code(GetBitContext *gb)
Definition: indeo2.c:47
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
GetBitContext gb
Definition: indeo2.c:39
int decode_delta
Definition: indeo2.c:40
int size
Definition: avcodec.h:1347
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1621
#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: avcodec.h:3120
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:108
AVCodec ff_indeo2_decoder
Definition: indeo2.c:254
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:66
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:68
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:199
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:1346
bitstream reader API header.
static av_cold int ir2_decode_init(AVCodecContext *avctx)
Definition: indeo2.c:217
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#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:80
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
const char * name
Name of the codec implementation.
Definition: avcodec.h:3127
Definition: vlc.h:26
static av_cold int ir2_decode_end(AVCodecContext *avctx)
Definition: indeo2.c:245
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: utils.c:672
int width
picture width / height.
Definition: avcodec.h:1580
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: avconv.c:1288
AVFormatContext * ctx
Definition: movenc.c:48
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:493
#define INIT_VLC_LE
Definition: vlc.h:54
int table_allocated
Definition: vlc.h:29
#define CODE_VLC_BITS
Definition: indeo2.c:43
static int width
Definition: utils.c:156
Libavcodec external API header.
static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: indeo2.c:142
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:158
main external API structure.
Definition: avcodec.h:1409
AVFrame * picture
Definition: indeo2.c:38
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:65
#define IR2_CODES
Definition: indeo2data.h:27
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:362
static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]
Definition: imc.c:117
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:146
int height
Definition: gxfenc.c:72
common internal api header.
#define INIT_VLC_USE_NEW_STATIC
Definition: vlc.h:55
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
void * priv_data
Definition: avcodec.h:1451
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
const uint8_t ff_reverse[256]
Definition: mathtables.c:72
#define VLC_TYPE
Definition: vlc.h:24
static VLC ir2_vlc
Definition: indeo2.c:44
This structure stores compressed data.
Definition: avcodec.h:1323
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:838
static const uint16_t ir2_codes[IR2_CODES][2]
Definition: indeo2data.h:28