FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/ivi.h
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 7 7 100.0%
Branches: 9 16 56.2%

Line Branch Exec Source
1 /*
2 * common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
3 *
4 * Copyright (c) 2009 Maxim Poliakovski
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * This file contains structures and macros shared by both Indeo4 and
26 * Indeo5 decoders.
27 */
28
29 #ifndef AVCODEC_IVI_H
30 #define AVCODEC_IVI_H
31
32 #include "avcodec.h"
33 #include "get_bits.h"
34 #include <stdint.h>
35
36 /**
37 * Indeo 4 frame types.
38 */
39 enum {
40 IVI4_FRAMETYPE_INTRA = 0,
41 IVI4_FRAMETYPE_INTRA1 = 1, ///< intra frame with slightly different bitstream coding
42 IVI4_FRAMETYPE_INTER = 2, ///< non-droppable P-frame
43 IVI4_FRAMETYPE_BIDIR = 3, ///< bidirectional frame
44 IVI4_FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame
45 IVI4_FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data
46 IVI4_FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data
47 };
48
49 #define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes
50 #define IVI5_IS_PROTECTED 0x20
51
52 /**
53 * huffman codebook descriptor
54 */
55 typedef struct IVIHuffDesc {
56 int32_t num_rows;
57 uint8_t xbits[16];
58 } IVIHuffDesc;
59
60 /**
61 * macroblock/block huffman table descriptor
62 */
63 typedef struct IVIHuffTab {
64 int32_t tab_sel; /// index of one of the predefined tables
65 /// or "7" for custom one
66 VLC *tab; /// pointer to the table associated with tab_sel
67
68 /// the following are used only when tab_sel == 7
69 IVIHuffDesc cust_desc; /// custom Huffman codebook descriptor
70 VLC cust_tab; /// vlc table for custom codebook
71 } IVIHuffTab;
72
73 enum {
74 IVI_MB_HUFF = 0, /// Huffman table is used for coding macroblocks
75 IVI_BLK_HUFF = 1 /// Huffman table is used for coding blocks
76 };
77
78
79 /**
80 * Common scan patterns (defined in ivi_common.c)
81 */
82 extern const uint8_t ff_ivi_vertical_scan_8x8[64];
83 extern const uint8_t ff_ivi_horizontal_scan_8x8[64];
84 extern const uint8_t ff_ivi_direct_scan_4x4[16];
85
86
87 /**
88 * Declare inverse transform function types
89 */
90 typedef void (InvTransformPtr)(const int32_t *in, int16_t *out, ptrdiff_t pitch, const uint8_t *flags);
91 typedef void (DCTransformPtr) (const int32_t *in, int16_t *out, ptrdiff_t pitch, int blk_size);
92
93
94 /**
95 * run-value (RLE) table descriptor
96 */
97 typedef struct RVMapDesc {
98 uint8_t eob_sym; ///< end of block symbol
99 uint8_t esc_sym; ///< escape symbol
100 uint8_t runtab[256];
101 int8_t valtab[256];
102 } RVMapDesc;
103
104 extern const RVMapDesc ff_ivi_rvmap_tabs[9];
105
106
107 /**
108 * information for Indeo macroblock (16x16, 8x8 or 4x4)
109 */
110 typedef struct IVIMbInfo {
111 int16_t xpos;
112 int16_t ypos;
113 uint32_t buf_offs; ///< address in the output buffer for this mb
114 uint8_t type; ///< macroblock type: 0 - INTRA, 1 - INTER
115 uint8_t cbp; ///< coded block pattern
116 int8_t q_delta; ///< quant delta
117 int8_t mv_x; ///< motion vector (x component)
118 int8_t mv_y; ///< motion vector (y component)
119 int8_t b_mv_x; ///< second motion vector (x component)
120 int8_t b_mv_y; ///< second motion vector (y component)
121 } IVIMbInfo;
122
123
124 /**
125 * information for Indeo tile
126 */
127 typedef struct IVITile {
128 int xpos;
129 int ypos;
130 int width;
131 int height;
132 int mb_size;
133 int is_empty; ///< = 1 if this tile doesn't contain any data
134 int data_size; ///< size of the data in bytes
135 int num_MBs; ///< number of macroblocks in this tile
136 IVIMbInfo *mbs; ///< array of macroblock descriptors
137 IVIMbInfo *ref_mbs; ///< ptr to the macroblock descriptors of the reference tile
138 } IVITile;
139
140
141 /**
142 * information for Indeo wavelet band
143 */
144 typedef struct IVIBandDesc {
145 int plane; ///< plane number this band belongs to
146 int band_num; ///< band number
147 int width;
148 int height;
149 int aheight; ///< aligned band height
150 const uint8_t *data_ptr; ///< ptr to the first byte of the band data
151 int data_size; ///< size of the band data
152 int16_t *buf; ///< pointer to the output buffer for this band
153 int16_t *ref_buf; ///< pointer to the reference frame buffer (for motion compensation)
154 int16_t *b_ref_buf; ///< pointer to the second reference frame buffer (for motion compensation)
155 int16_t *bufs[4]; ///< array of pointers to the band buffers
156 ptrdiff_t pitch; ///< pitch associated with the buffers above
157 int is_empty; ///< = 1 if this band doesn't contain any data
158 int mb_size; ///< macroblock size
159 int blk_size; ///< block size
160 int is_halfpel; ///< precision of the motion compensation: 0 - fullpel, 1 - halfpel
161 int inherit_mv; ///< tells if motion vector is inherited from reference macroblock
162 int inherit_qdelta; ///< tells if quantiser delta is inherited from reference macroblock
163 int qdelta_present; ///< tells if Qdelta signal is present in the bitstream (Indeo5 only)
164 int quant_mat; ///< dequant matrix index
165 int glob_quant; ///< quant base for this band
166 const uint8_t *scan; ///< ptr to the scan pattern
167 int scan_size; ///< size of the scantable
168
169 IVIHuffTab blk_vlc; ///< vlc table for decoding block data
170
171 int num_corr; ///< number of correction entries
172 uint8_t corr[61*2]; ///< rvmap correction pairs
173 int rvmap_sel; ///< rvmap table selector
174 RVMapDesc *rv_map; ///< ptr to the RLE table for this band
175 int num_tiles; ///< number of tiles in this band
176 IVITile *tiles; ///< array of tile descriptors
177 InvTransformPtr *inv_transform;
178 int transform_size;
179 DCTransformPtr *dc_transform;
180 int is_2d_trans; ///< 1 indicates that the two-dimensional inverse transform is used
181 int32_t checksum; ///< for debug purposes
182 int checksum_present;
183 int bufsize; ///< band buffer size in bytes
184 const uint16_t *intra_base; ///< quantization matrix for intra blocks
185 const uint16_t *inter_base; ///< quantization matrix for inter blocks
186 const uint8_t *intra_scale; ///< quantization coefficient for intra blocks
187 const uint8_t *inter_scale; ///< quantization coefficient for inter blocks
188 } IVIBandDesc;
189
190
191 /**
192 * color plane (luma or chroma) information
193 */
194 typedef struct IVIPlaneDesc {
195 uint16_t width;
196 uint16_t height;
197 uint8_t num_bands; ///< number of bands this plane subdivided into
198 IVIBandDesc *bands; ///< array of band descriptors
199 } IVIPlaneDesc;
200
201
202 typedef struct IVIPicConfig {
203 uint16_t pic_width;
204 uint16_t pic_height;
205 uint16_t chroma_width;
206 uint16_t chroma_height;
207 uint16_t tile_width;
208 uint16_t tile_height;
209 uint8_t luma_bands;
210 uint8_t chroma_bands;
211 } IVIPicConfig;
212
213 typedef struct IVI45DecContext {
214 GetBitContext gb;
215 RVMapDesc rvmap_tabs[9]; ///< local corrected copy of the static rvmap tables
216
217 uint32_t frame_num;
218 int frame_type;
219 int prev_frame_type; ///< frame type of the previous frame
220 uint32_t data_size; ///< size of the frame data in bytes from picture header
221 int is_scalable;
222 const uint8_t *frame_data; ///< input frame data pointer
223 int inter_scal; ///< signals a sequence of scalable inter frames
224 uint32_t frame_size; ///< frame size in bytes
225 uint32_t pic_hdr_size; ///< picture header size in bytes
226 uint8_t frame_flags;
227 uint16_t checksum; ///< frame checksum
228
229 IVIPicConfig pic_conf;
230 IVIPlaneDesc planes[3]; ///< color planes
231
232 int buf_switch; ///< used to switch between three buffers
233 int dst_buf; ///< buffer index for the currently decoded frame
234 int ref_buf; ///< inter frame reference buffer index
235 int ref2_buf; ///< temporal storage for switching buffers
236 int b_ref_buf; ///< second reference frame buffer index
237
238 IVIHuffTab mb_vlc; ///< current macroblock table descriptor
239 IVIHuffTab blk_vlc; ///< current block table descriptor
240
241 uint8_t rvmap_sel;
242 uint8_t in_imf;
243 uint8_t in_q; ///< flag for explicitly stored quantiser delta
244 uint8_t pic_glob_quant;
245 uint8_t unknown1;
246
247 uint16_t gop_hdr_size;
248 uint8_t gop_flags;
249 uint32_t lock_word;
250
251 int show_indeo4_info;
252 uint8_t has_b_frames;
253 uint8_t has_transp; ///< transparency mode status: 1 - enabled
254 uint8_t uses_tiling;
255 uint8_t uses_haar;
256 uint8_t uses_fullpel;
257
258 int (*decode_pic_hdr) (struct IVI45DecContext *ctx, AVCodecContext *avctx);
259 int (*decode_band_hdr) (struct IVI45DecContext *ctx, IVIBandDesc *band, AVCodecContext *avctx);
260 int (*decode_mb_info) (struct IVI45DecContext *ctx, IVIBandDesc *band, IVITile *tile, AVCodecContext *avctx);
261 void (*switch_buffers) (struct IVI45DecContext *ctx);
262 int (*is_nonnull_frame)(struct IVI45DecContext *ctx);
263
264 int gop_invalid;
265 int buf_invalid[4];
266
267 int is_indeo4;
268
269 AVFrame *p_frame;
270 int got_p_frame;
271 } IVI45DecContext;
272
273 /** compare some properties of two pictures */
274 110 static inline int ivi_pic_config_cmp(IVIPicConfig *str1, IVIPicConfig *str2)
275 {
276
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109 return str1->pic_width != str2->pic_width || str1->pic_height != str2->pic_height ||
277
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109 str1->chroma_width != str2->chroma_width || str1->chroma_height != str2->chroma_height ||
278
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109 str1->tile_width != str2->tile_width || str1->tile_height != str2->tile_height ||
279
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219 str1->luma_bands != str2->luma_bands || str1->chroma_bands != str2->chroma_bands;
280 }
281
282 /** calculate number of tiles in a stride */
283 #define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))
284
285 /** calculate number of macroblocks in a tile */
286 #define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
287 ((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))
288
289 /** convert unsigned values into signed ones (the sign is in the LSB) */
290 #define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))
291
292 /** scale motion vector */
293 94572 static inline int ivi_scale_mv(int mv, int mv_scale)
294 {
295 94572 return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
296 }
297
298 /**
299 * Initialize static codes used for macroblock and block decoding.
300 */
301 void ff_ivi_init_static_vlc(void);
302
303 /**
304 * Decode a huffman codebook descriptor from the bitstream
305 * and select specified huffman table.
306 *
307 * @param[in,out] gb the GetBit context
308 * @param[in] desc_coded flag signalling if table descriptor was coded
309 * @param[in] which_tab codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
310 * @param[out] huff_tab pointer to the descriptor of the selected table
311 * @param[in] avctx AVCodecContext pointer
312 * @return zero on success, negative value otherwise
313 */
314 int ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
315 IVIHuffTab *huff_tab, AVCodecContext *avctx);
316
317 /**
318 * Initialize planes (prepares descriptors, allocates buffers etc).
319 *
320 * @param[in,out] planes pointer to the array of the plane descriptors
321 * @param[in] cfg pointer to the ivi_pic_config structure describing picture layout
322 * @param[in] is_indeo4 flag signalling if it is Indeo 4 or not
323 * @return result code: 0 - OK
324 */
325 int ff_ivi_init_planes(AVCodecContext *avctx, IVIPlaneDesc *planes,
326 const IVIPicConfig *cfg, int is_indeo4);
327
328 /**
329 * Initialize tile and macroblock descriptors.
330 *
331 * @param[in,out] planes pointer to the array of the plane descriptors
332 * @param[in] tile_width tile width
333 * @param[in] tile_height tile height
334 * @return result code: 0 - OK
335 */
336 int ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);
337
338 int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
339 AVPacket *avpkt);
340 int ff_ivi_decode_close(AVCodecContext *avctx);
341
342 #endif /* AVCODEC_IVI_H */
343