FFmpeg
ffv1.c
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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 
31 #include "avcodec.h"
32 #include "rangecoder.h"
33 #include "ffv1.h"
34 #include "threadframe.h"
35 
37 {
38  FFV1Context *s = avctx->priv_data;
39 
40  if (!avctx->width || !avctx->height)
41  return AVERROR_INVALIDDATA;
42 
43  s->avctx = avctx;
44  s->flags = avctx->flags;
45 
46  s->width = avctx->width;
47  s->height = avctx->height;
48 
49  // defaults
50  s->num_h_slices = 1;
51  s->num_v_slices = 1;
52 
53  return 0;
54 }
55 
57 {
58  int j, i;
59 
60  fs->plane_count = f->plane_count;
61  fs->transparency = f->transparency;
62  for (j = 0; j < f->plane_count; j++) {
63  PlaneContext *const p = &fs->plane[j];
64 
65  if (fs->ac != AC_GOLOMB_RICE) {
66  if (!p->state)
68  sizeof(uint8_t));
69  if (!p->state)
70  return AVERROR(ENOMEM);
71  } else {
72  if (!p->vlc_state) {
73  p->vlc_state = av_calloc(p->context_count, sizeof(*p->vlc_state));
74  if (!p->vlc_state)
75  return AVERROR(ENOMEM);
76  for (i = 0; i < p->context_count; i++) {
77  p->vlc_state[i].error_sum = 4;
78  p->vlc_state[i].count = 1;
79  }
80  }
81  }
82  }
83 
84  if (fs->ac == AC_RANGE_CUSTOM_TAB) {
85  //FIXME only redo if state_transition changed
86  for (j = 1; j < 256; j++) {
87  fs->c. one_state[ j] = f->state_transition[j];
88  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
89  }
90  }
91 
92  return 0;
93 }
94 
96 {
97  int i, ret;
98  for (i = 0; i < f->max_slice_count; i++) {
99  FFV1Context *fs = f->slice_context[i];
100  if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
101  return AVERROR(ENOMEM);
102  }
103  return 0;
104 }
105 
107 {
108  int i, max_slice_count = f->num_h_slices * f->num_v_slices;
109 
110  av_assert0(max_slice_count > 0);
111 
112  for (i = 0; i < max_slice_count;) {
113  int sx = i % f->num_h_slices;
114  int sy = i / f->num_h_slices;
115  int sxs = f->avctx->width * sx / f->num_h_slices;
116  int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
117  int sys = f->avctx->height * sy / f->num_v_slices;
118  int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
119  FFV1Context *fs = av_mallocz(sizeof(*fs));
120 
121  if (!fs)
122  goto memfail;
123 
124  f->slice_context[i++] = fs;
125  memcpy(fs, f, sizeof(*fs));
126  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
127 
128  fs->slice_width = sxe - sxs;
129  fs->slice_height = sye - sys;
130  fs->slice_x = sxs;
131  fs->slice_y = sys;
132 
133  fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
134  sizeof(*fs->sample_buffer));
135  fs->sample_buffer32 = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
136  sizeof(*fs->sample_buffer32));
137  if (!fs->sample_buffer || !fs->sample_buffer32)
138  goto memfail;
139  }
140  f->max_slice_count = max_slice_count;
141  return 0;
142 
143 memfail:
144  f->max_slice_count = i;
145  return AVERROR(ENOMEM);
146 }
147 
149 {
150  int i;
151 
152  for (i = 0; i < f->quant_table_count; i++) {
153  f->initial_states[i] = av_malloc_array(f->context_count[i],
154  sizeof(*f->initial_states[i]));
155  if (!f->initial_states[i])
156  return AVERROR(ENOMEM);
157  memset(f->initial_states[i], 128,
158  f->context_count[i] * sizeof(*f->initial_states[i]));
159  }
160  return 0;
161 }
162 
164 {
165  int i, j;
166 
167  for (i = 0; i < f->plane_count; i++) {
168  PlaneContext *p = &fs->plane[i];
169 
170  p->interlace_bit_state[0] = 128;
171  p->interlace_bit_state[1] = 128;
172 
173  if (fs->ac != AC_GOLOMB_RICE) {
174  if (f->initial_states[p->quant_table_index]) {
175  memcpy(p->state, f->initial_states[p->quant_table_index],
177  } else
178  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
179  } else {
180  for (j = 0; j < p->context_count; j++) {
181  p->vlc_state[j].drift = 0;
182  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
183  p->vlc_state[j].bias = 0;
184  p->vlc_state[j].count = 1;
185  }
186  }
187  }
188 }
189 
190 
192 {
193  FFV1Context *s = avctx->priv_data;
194  int i, j;
195 
196  for (j = 0; j < s->max_slice_count; j++) {
197  FFV1Context *fs = s->slice_context[j];
198  for (i = 0; i < s->plane_count; i++) {
199  PlaneContext *p = &fs->plane[i];
200 
201  av_freep(&p->state);
202  av_freep(&p->vlc_state);
203  }
204  av_freep(&fs->sample_buffer);
205  av_freep(&fs->sample_buffer32);
206  }
207 
208  av_freep(&avctx->stats_out);
209  for (j = 0; j < s->quant_table_count; j++) {
210  av_freep(&s->initial_states[j]);
211  for (i = 0; i < s->max_slice_count; i++) {
212  FFV1Context *sf = s->slice_context[i];
213  av_freep(&sf->rc_stat2[j]);
214  }
215  av_freep(&s->rc_stat2[j]);
216  }
217 
218  for (i = 0; i < s->max_slice_count; i++)
219  av_freep(&s->slice_context[i]);
220 
221  return 0;
222 }
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
ff_ffv1_common_init
av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
Definition: ffv1.c:36
rangecoder.h
PlaneContext::state
uint8_t(* state)[CONTEXT_SIZE]
Definition: ffv1.h:66
AC_RANGE_CUSTOM_TAB
#define AC_RANGE_CUSTOM_TAB
Definition: ffv1.h:52
ff_ffv1_init_slices_state
av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
Definition: ffv1.c:95
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:478
CONTEXT_SIZE
#define CONTEXT_SIZE
Definition: ffv1.h:45
PlaneContext::context_count
int context_count
Definition: ffv1.h:65
ff_ffv1_clear_slice_state
void ff_ffv1_clear_slice_state(const FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:163
avassert.h
av_cold
#define av_cold
Definition: attributes.h:90
s
#define s(width, name)
Definition: cbs_vp9.c:256
MAX_PLANES
#define MAX_PLANES
Definition: ffv1.h:44
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
VlcState::error_sum
uint16_t error_sum
Definition: ffv1.h:57
PlaneContext::interlace_bit_state
uint8_t interlace_bit_state[2]
Definition: ffv1.h:68
threadframe.h
PlaneContext::vlc_state
VlcState * vlc_state
Definition: ffv1.h:67
AC_GOLOMB_RICE
#define AC_GOLOMB_RICE
Definition: ffv1.h:50
fs
#define fs(width, name, subs,...)
Definition: cbs_vp9.c:258
PlaneContext
Definition: ffv1.h:62
AVCodecContext::stats_out
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:1265
f
f
Definition: af_crystalizer.c:122
ff_ffv1_close
av_cold int ff_ffv1_close(AVCodecContext *avctx)
Definition: ffv1.c:191
VlcState::count
uint8_t count
Definition: ffv1.h:59
attributes.h
PlaneContext::quant_table_index
int quant_table_index
Definition: ffv1.h:64
VlcState::drift
int16_t drift
Definition: ffv1.h:56
ff_ffv1_init_slice_state
av_cold int ff_ffv1_init_slice_state(const FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:56
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
ffv1.h
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:264
AVCodecContext::height
int height
Definition: avcodec.h:571
av_calloc
void * av_calloc(size_t nmemb, size_t size)
Definition: mem.c:272
avcodec.h
ret
ret
Definition: filter_design.txt:187
FFV1Context::rc_stat2
uint64_t(*[MAX_QUANT_TABLES] rc_stat2)[32][2]
Definition: ffv1.h:80
ff_ffv1_allocate_initial_states
int ff_ffv1_allocate_initial_states(FFV1Context *f)
Definition: ffv1.c:148
AVCodecContext
main external API structure.
Definition: avcodec.h:398
VlcState::bias
int8_t bias
Definition: ffv1.h:58
FFV1Context
Definition: ffv1.h:73
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
ff_ffv1_init_slice_contexts
av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
Definition: ffv1.c:106
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61