FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/ffv1.c
Date: 2025-12-07 22:02:57
Exec Total Coverage
Lines: 137 152 90.1%
Functions: 13 13 100.0%
Branches: 60 86 69.8%
Line Branch Exec Source
1 /*
2 * FFV1 codec for libavcodec
3 *
4 * Copyright (c) 2003-2013 Michael Niedermayer <michaelni@gmx.at>
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 * FF Video Codec 1 (a lossless codec)
26 */
27
28 #include "libavutil/attributes.h"
29 #include "libavutil/avassert.h"
30 #include "libavutil/mem.h"
31
32 #include "avcodec.h"
33 #include "ffv1.h"
34 #include "libavutil/refstruct.h"
35
36 205 av_cold int ff_ffv1_common_init(AVCodecContext *avctx, FFV1Context *s)
37 {
38
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 205 if (!avctx->width || !avctx->height)
39 ✗ return AVERROR_INVALIDDATA;
40
41 205 s->avctx = avctx;
42 205 s->flags = avctx->flags;
43
44 205 s->width = avctx->width;
45 205 s->height = avctx->height;
46
47 // defaults
48 205 s->num_h_slices = 1;
49 205 s->num_v_slices = 1;
50
51 205 return 0;
52 }
53
54 1490 static void planes_free(AVRefStructOpaque opaque, void *obj)
55 {
56 1490 PlaneContext *planes = obj;
57
58
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 7450 for (int i = 0; i < MAX_PLANES; i++) {
59 5960 PlaneContext *p = &planes[i];
60
61 5960 av_freep(&p->state);
62 5960 av_freep(&p->vlc_state);
63 }
64 1490 }
65
66 1490 PlaneContext* ff_ffv1_planes_alloc(void)
67 {
68 1490 return av_refstruct_alloc_ext(sizeof(PlaneContext) * MAX_PLANES,
69 0, NULL, planes_free);
70 }
71
72 14597 av_cold int ff_ffv1_init_slice_state(const FFV1Context *f,
73 FFV1SliceContext *sc)
74 {
75 int j, i;
76
77
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 43791 for (j = 0; j < f->plane_count; j++) {
78 29194 PlaneContext *const p = &sc->plane[j];
79
80
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 29194 if (f->ac != AC_GOLOMB_RICE) {
81
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 16242 if (!p->state)
82 1842 p->state = av_calloc(p->context_count, CONTEXT_SIZE *
83 sizeof(uint8_t));
84
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 16242 if (!p->state)
85 ✗ return AVERROR(ENOMEM);
86 } else {
87
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 12952 if (!p->vlc_state) {
88 1440 p->vlc_state = av_calloc(p->context_count, sizeof(*p->vlc_state));
89
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 1440 if (!p->vlc_state)
90 ✗ return AVERROR(ENOMEM);
91
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 598176 for (i = 0; i < p->context_count; i++) {
92 596736 p->vlc_state[i].error_sum = 4;
93 596736 p->vlc_state[i].count = 1;
94 }
95 }
96 }
97 }
98
99
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 14597 if (f->ac == AC_RANGE_CUSTOM_TAB) {
100 //FIXME only redo if state_transition changed
101
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 2078976 for (j = 1; j < 256; j++) {
102 2070855 sc->c. one_state[ j] = f->state_transition[j];
103 2070855 sc->c.zero_state[256 - j] = 256 - sc->c.one_state[j];
104 }
105 }
106
107 14597 return 0;
108 }
109
110 51 av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
111 {
112 int i, ret;
113
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 248 for (i = 0; i < f->max_slice_count; i++) {
114
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 197 if ((ret = ff_ffv1_init_slice_state(f, &f->slices[i])) < 0)
115 ✗ return AVERROR(ENOMEM);
116 }
117 51 return 0;
118 }
119
120 116 int ff_need_new_slices(int width, int num_h_slices, int chroma_shift) {
121 116 int mpw = 1<<chroma_shift;
122 116 int i = width * (int64_t)(num_h_slices - 1) / num_h_slices;
123
124
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 116 return width % mpw && (width - i) % mpw == 0;
125 }
126
127 28960 int ff_slice_coord(const FFV1Context *f, int width, int sx, int num_h_slices, int chroma_shift) {
128 28960 int mpw = 1<<chroma_shift;
129 28960 int awidth = FFALIGN(width, mpw);
130
131
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 28960 if (f->combined_version <= 0x40002)
132 28960 return width * sx / num_h_slices;
133
134 ✗ sx = (2LL * awidth * sx + num_h_slices * mpw) / (2 * num_h_slices * mpw) * mpw;
135 ✗ if (sx == awidth)
136 ✗ sx = width;
137 ✗ return sx;
138 }
139
140 139 av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
141 {
142 139 int max_slice_count = f->num_h_slices * f->num_v_slices;
143
144
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 139 av_assert0(max_slice_count > 0);
145
146 139 f->slices = av_calloc(max_slice_count, sizeof(*f->slices));
147
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 139 if (!f->slices)
148 ✗ return AVERROR(ENOMEM);
149
150 139 f->max_slice_count = max_slice_count;
151
152
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 679 for (int i = 0; i < max_slice_count; i++) {
153 540 FFV1SliceContext *sc = &f->slices[i];
154 540 int sx = i % f->num_h_slices;
155 540 int sy = i / f->num_h_slices;
156 540 int sxs = ff_slice_coord(f, f->avctx->width , sx , f->num_h_slices, f->chroma_h_shift);
157 540 int sxe = ff_slice_coord(f, f->avctx->width , sx + 1, f->num_h_slices, f->chroma_h_shift);
158 540 int sys = ff_slice_coord(f, f->avctx->height, sy , f->num_v_slices, f->chroma_v_shift);
159 540 int sye = ff_slice_coord(f, f->avctx->height, sy + 1, f->num_v_slices, f->chroma_v_shift);
160
161 540 sc->slice_width = sxe - sxs;
162 540 sc->slice_height = sye - sys;
163 540 sc->slice_x = sxs;
164 540 sc->slice_y = sys;
165 540 sc->sx = sx;
166 540 sc->sy = sy;
167
168 540 sc->sample_buffer = av_malloc_array((f->width + 6), 3 * MAX_PLANES *
169 sizeof(*sc->sample_buffer));
170 540 sc->sample_buffer32 = av_malloc_array((f->width + 6), 3 * MAX_PLANES *
171 sizeof(*sc->sample_buffer32));
172
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 540 if (!sc->sample_buffer || !sc->sample_buffer32)
173 ✗ return AVERROR(ENOMEM);
174
175 540 sc->plane = ff_ffv1_planes_alloc();
176
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 540 if (!sc->plane)
177 ✗ return AVERROR(ENOMEM);
178 }
179
180 139 return 0;
181 }
182
183 193 int ff_ffv1_allocate_initial_states(FFV1Context *f)
184 {
185 int i;
186
187
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 579 for (i = 0; i < f->quant_table_count; i++) {
188 386 f->initial_states[i] = av_malloc_array(f->context_count[i],
189 sizeof(*f->initial_states[i]));
190
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 386 if (!f->initial_states[i])
191 ✗ return AVERROR(ENOMEM);
192 386 memset(f->initial_states[i], 128,
193 386 f->context_count[i] * sizeof(*f->initial_states[i]));
194 }
195 193 return 0;
196 }
197
198 1713 void ff_ffv1_clear_slice_state(const FFV1Context *f, FFV1SliceContext *sc)
199 {
200 int i, j;
201
202
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 5139 for (i = 0; i < f->plane_count; i++) {
203 3426 PlaneContext *p = &sc->plane[i];
204
205
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 3426 if (f->ac != AC_GOLOMB_RICE) {
206
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 1938 if (f->initial_states[p->quant_table_index]) {
207 1938 memcpy(p->state, f->initial_states[p->quant_table_index],
208 1938 CONTEXT_SIZE * p->context_count);
209 } else
210 ✗ memset(p->state, 128, CONTEXT_SIZE * p->context_count);
211 } else {
212
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 992496 for (j = 0; j < p->context_count; j++) {
213 991008 p->vlc_state[j].drift = 0;
214 991008 p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
215 991008 p->vlc_state[j].bias = 0;
216 991008 p->vlc_state[j].count = 1;
217 }
218 }
219 }
220 1713 }
221
222 3200 void ff_ffv1_compute_bits_per_plane(const FFV1Context *f, FFV1SliceContext *sc, int bits[4], int *offset, int mask[4], int bits_per_raw_sample)
223 {
224 // to simplify we use the remap_count as the symbol range in each plane
225
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 3200 if (!sc->remap) {
226 3200 sc->remap_count[0] =
227 3200 sc->remap_count[1] =
228 3200 sc->remap_count[2] =
229
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 3200 sc->remap_count[3] = 1 << (bits_per_raw_sample > 0 ? bits_per_raw_sample : 8);
230 }
231
232
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 3200 if (sc->remap)
233 ✗ av_assert0(bits_per_raw_sample > 8); //breaks with lbd, needs review if added
234
235 //bits with no RCT
236
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 12800 for (int p=0; p<3+f->transparency; p++) {
237 9600 bits[p] = av_ceil_log2(sc->remap_count[p]);
238
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 9600 if (mask)
239 4800 mask[p] = (1<<bits[p]) - 1;
240 }
241
242 //RCT
243
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 3200 if (sc->slice_coding_mode == 0) {
244 3200 *offset = sc->remap_count[0];
245
246 3200 bits[0] = av_ceil_log2(FFMAX3(sc->remap_count[0], sc->remap_count[1], sc->remap_count[2]));
247 3200 bits[1] = av_ceil_log2(sc->remap_count[0] + sc->remap_count[1]);
248 3200 bits[2] = av_ceil_log2(sc->remap_count[0] + sc->remap_count[2]);
249
250 //old version coded a bit more than needed
251
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 3200 if (f->combined_version < 0x40008) {
252 3200 bits[0]++;
253
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 3200 if(f->transparency)
254 ✗ bits[3]++;
255 }
256 }
257 3200 }
258
259 4933784 int ff_ffv1_get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
260 {
261 4933784 return get_symbol_inline(c, state, is_signed);
262 }
263
264 206 av_cold void ff_ffv1_close(FFV1Context *s)
265 {
266 int i, j;
267
268
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 746 for (j = 0; j < s->max_slice_count; j++) {
269 540 FFV1SliceContext *sc = &s->slices[j];
270
271 540 av_freep(&sc->sample_buffer);
272 540 av_freep(&sc->sample_buffer32);
273
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 2700 for(int p = 0; p < 4 ; p++) {
274 2160 av_freep(&sc->fltmap[p]);
275 2160 av_freep(&sc->fltmap32[p]);
276 2160 sc->fltmap_size [p] = 0;
277 2160 sc->fltmap32_size[p] = 0;
278 }
279
280 540 av_refstruct_unref(&sc->plane);
281 }
282
283 206 av_refstruct_unref(&s->slice_damaged);
284
285
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 592 for (j = 0; j < s->quant_table_count; j++) {
286 386 av_freep(&s->initial_states[j]);
287
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 1450 for (i = 0; i < s->max_slice_count; i++) {
288 1064 FFV1SliceContext *sc = &s->slices[i];
289 1064 av_freep(&sc->rc_stat2[j]);
290 }
291 386 av_freep(&s->rc_stat2[j]);
292 }
293
294 206 av_freep(&s->slices);
295 206 }
296