FFmpeg: libavcodec/ffv1.c Source File

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 #include "libavutil/crc.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/imgutils.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/timer.h"
35 #include "avcodec.h"
36 #include "internal.h"
37 #include "rangecoder.h"
38 #include "golomb.h"
39 #include "mathops.h"
40 #include "ffv1.h"
41 
42  av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
43 {
44  FFV1Context *s = avctx->priv_data;
45 
46  if (!avctx->width || !avctx->height)
47  return AVERROR_INVALIDDATA;
48 
49  s->avctx = avctx;
50  s->flags = avctx->flags;
51 
52  s->picture.f = av_frame_alloc();
53  s->last_picture.f = av_frame_alloc();
54  if (!s->picture.f || !s->last_picture.f)
55  return AVERROR(ENOMEM);
56 
57  s->width = avctx->width;
58  s->height = avctx->height;
59 
60  // defaults
61  s->num_h_slices = 1;
62  s->num_v_slices = 1;
63 
64  return 0;
65 }
66 
67  av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
68 {
69  int j, i;
70 
71  fs->plane_count = f->plane_count;
72  fs->transparency = f->transparency;
73  for (j = 0; j < f->plane_count; j++) {
74  PlaneContext *const p = &fs->plane[j];
75 
76  if (fs->ac != AC_GOLOMB_RICE) {
77  if (!p->state)
78  p->state = av_malloc_array(p->context_count, CONTEXT_SIZE *
79  sizeof(uint8_t));
80  if (!p->state)
81  return AVERROR(ENOMEM);
82  } else {
83  if (!p->vlc_state) {
84  p->vlc_state = av_mallocz_array(p->context_count, sizeof(VlcState));
85  if (!p->vlc_state)
86  return AVERROR(ENOMEM);
87  for (i = 0; i < p->context_count; i++) {
88  p->vlc_state[i].error_sum = 4;
89  p->vlc_state[i].count = 1;
90  }
91  }
92  }
93  }
94 
95  if (fs->ac == AC_RANGE_CUSTOM_TAB) {
96  //FIXME only redo if state_transition changed
97  for (j = 1; j < 256; j++) {
98  fs->c. one_state[ j] = f->state_transition[j];
99  fs->c.zero_state[256 - j] = 256 - fs->c.one_state[j];
100  }
101  }
102 
103  return 0;
104 }
105 
106  av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
107 {
108  int i, ret;
109  for (i = 0; i < f->max_slice_count; i++) {
110  FFV1Context *fs = f->slice_context[i];
111  if ((ret = ff_ffv1_init_slice_state(f, fs)) < 0)
112  return AVERROR(ENOMEM);
113  }
114  return 0;
115 }
116 
117  av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
118 {
119  int i;
120 
121  f->max_slice_count = f->num_h_slices * f->num_v_slices;
122  av_assert0(f->max_slice_count > 0);
123 
124  for (i = 0; i < f->max_slice_count; i++) {
125  int sx = i % f->num_h_slices;
126  int sy = i / f->num_h_slices;
127  int sxs = f->avctx->width * sx / f->num_h_slices;
128  int sxe = f->avctx->width * (sx + 1) / f->num_h_slices;
129  int sys = f->avctx->height * sy / f->num_v_slices;
130  int sye = f->avctx->height * (sy + 1) / f->num_v_slices;
131  FFV1Context *fs = av_mallocz(sizeof(*fs));
132 
133  if (!fs)
134  goto memfail;
135 
136  f->slice_context[i] = fs;
137  memcpy(fs, f, sizeof(*fs));
138  memset(fs->rc_stat2, 0, sizeof(fs->rc_stat2));
139 
140  fs->slice_width = sxe - sxs;
141  fs->slice_height = sye - sys;
142  fs->slice_x = sxs;
143  fs->slice_y = sys;
144 
145  fs->sample_buffer = av_malloc_array((fs->width + 6), 3 * MAX_PLANES *
146  sizeof(*fs->sample_buffer));
147  if (!fs->sample_buffer) {
148  av_freep(&f->slice_context[i]);
149  goto memfail;
150  }
151  }
152  return 0;
153 
154 memfail:
155  while(--i >= 0) {
156  av_freep(&f->slice_context[i]->sample_buffer);
157  av_freep(&f->slice_context[i]);
158  }
159  return AVERROR(ENOMEM);
160 }
161 
162  int ff_ffv1_allocate_initial_states(FFV1Context *f)
163 {
164  int i;
165 
166  for (i = 0; i < f->quant_table_count; i++) {
167  f->initial_states[i] = av_malloc_array(f->context_count[i],
168  sizeof(*f->initial_states[i]));
169  if (!f->initial_states[i])
170  return AVERROR(ENOMEM);
171  memset(f->initial_states[i], 128,
172  f->context_count[i] * sizeof(*f->initial_states[i]));
173  }
174  return 0;
175 }
176 
177  void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
178 {
179  int i, j;
180 
181  for (i = 0; i < f->plane_count; i++) {
182  PlaneContext *p = &fs->plane[i];
183 
184  p->interlace_bit_state[0] = 128;
185  p->interlace_bit_state[1] = 128;
186 
187  if (fs->ac != AC_GOLOMB_RICE) {
188  if (f->initial_states[p->quant_table_index]) {
189  memcpy(p->state, f->initial_states[p->quant_table_index],
190  CONTEXT_SIZE * p->context_count);
191  } else
192  memset(p->state, 128, CONTEXT_SIZE * p->context_count);
193  } else {
194  for (j = 0; j < p->context_count; j++) {
195  p->vlc_state[j].drift = 0;
196  p->vlc_state[j].error_sum = 4; //FFMAX((RANGE + 32)/64, 2);
197  p->vlc_state[j].bias = 0;
198  p->vlc_state[j].count = 1;
199  }
200  }
201  }
202 }
203 
204 
205  av_cold int ff_ffv1_close(AVCodecContext *avctx)
206 {
207  FFV1Context *s = avctx->priv_data;
208  int i, j;
209 
210  if (s->picture.f)
211  ff_thread_release_buffer(avctx, &s->picture);
212  av_frame_free(&s->picture.f);
213 
214  if (s->last_picture.f)
215  ff_thread_release_buffer(avctx, &s->last_picture);
216  av_frame_free(&s->last_picture.f);
217 
218  for (j = 0; j < s->max_slice_count; j++) {
219  FFV1Context *fs = s->slice_context[j];
220  for (i = 0; i < s->plane_count; i++) {
221  PlaneContext *p = &fs->plane[i];
222 
223  av_freep(&p->state);
224  av_freep(&p->vlc_state);
225  }
226  av_freep(&fs->sample_buffer);
227  }
228 
229  av_freep(&avctx->stats_out);
230  for (j = 0; j < s->quant_table_count; j++) {
231  av_freep(&s->initial_states[j]);
232  for (i = 0; i < s->max_slice_count; i++) {
233  FFV1Context *sf = s->slice_context[i];
234  av_freep(&sf->rc_stat2[j]);
235  }
236  av_freep(&s->rc_stat2[j]);
237  }
238 
239  for (i = 0; i < s->max_slice_count; i++)
240  av_freep(&s->slice_context[i]);
241 
242  return 0;
243 }
s
const char * s
Definition: avisynth_c.h:631
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
FFV1Context::flags
int flags
Definition: ffv1.h:93
imgutils.h
misc image utilities
ThreadFrame::f
AVFrame * f
Definition: thread.h:36
FFV1Context::quant_table_count
int quant_table_count
Definition: ffv1.h:123
FFV1Context::slice_height
int slice_height
Definition: ffv1.h:131
FFV1Context::sample_buffer
int16_t * sample_buffer
Definition: ffv1.h:111
RangeCoder::zero_state
uint8_t zero_state[256]
Definition: rangecoder.h:40
rangecoder.h
Range coder.
FFV1Context::rc_stat2
uint64_t(*[MAX_QUANT_TABLES] rc_stat2)[32][2]
Definition: ffv1.h:86
ffv1.h
FF Video Codec 1 (a lossless codec)
FFV1Context::height
int height
Definition: ffv1.h:89
RangeCoder::one_state
uint8_t one_state[256]
Definition: rangecoder.h:41
attributes.h
Macro definitions for various function/variable attributes.
FFV1Context::plane_count
int plane_count
Definition: ffv1.h:100
FFV1Context::picture
ThreadFrame picture
Definition: ffv1.h:96
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:82
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:141
opt.h
AVOptions.
VlcState::bias
int8_t bias
Definition: ffv1.h:64
FFV1Context::c
RangeCoder c
Definition: ffv1.h:82
ff_ffv1_common_init
av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
Definition: ffv1.c:42
FFV1Context::slice_y
int slice_y
Definition: ffv1.h:133
FFV1Context::initial_states
uint8_t(*[MAX_QUANT_TABLES] initial_states)[32]
Definition: ffv1.h:108
FFV1Context::last_picture
ThreadFrame last_picture
Definition: ffv1.h:96
ff_ffv1_close
av_cold int ff_ffv1_close(AVCodecContext *avctx)
Definition: ffv1.c:205
VlcState::count
uint8_t count
Definition: ffv1.h:65
PlaneContext::vlc_state
VlcState * vlc_state
Definition: ffv1.h:73
AVCodecContext::stats_out
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2692
timer.h
high precision timer, useful to profile code
FFV1Context::slice_width
int slice_width
Definition: ffv1.h:130
FFV1Context
Definition: ffv1.h:79
PlaneContext
Definition: ffv1.h:68
ff_ffv1_init_slices_state
av_cold int ff_ffv1_init_slices_state(FFV1Context *f)
Definition: ffv1.c:106
ff_thread_release_buffer
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
Wrapper around release_buffer() frame-for multithreaded codecs.
Definition: pthread_frame.c:851
AVERROR
#define AVERROR(e)
Definition: error.h:43
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:154
PlaneContext::context_count
int context_count
Definition: ffv1.h:71
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1627
avassert.h
simple assert() macros that are a bit more flexible than ISO C assert().
ff_ffv1_allocate_initial_states
int ff_ffv1_allocate_initial_states(FFV1Context *f)
Definition: ffv1.c:162
FFV1Context::ac
int ac
1=range coder <-> 0=golomb rice
Definition: ffv1.h:101
AC_RANGE_CUSTOM_TAB
#define AC_RANGE_CUSTOM_TAB
Definition: ffv1.h:58
VlcState
Definition: ffv1.h:61
FFV1Context::state_transition
uint8_t state_transition[256]
Definition: ffv1.h:107
FFV1Context::num_h_slices
int num_h_slices
Definition: ffv1.h:129
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1711
MAX_PLANES
#define MAX_PLANES
Definition: ffv1.h:50
FFV1Context::max_slice_count
int max_slice_count
Definition: ffv1.h:127
ff_ffv1_init_slice_contexts
av_cold int ff_ffv1_init_slice_contexts(FFV1Context *f)
Definition: ffv1.c:117
ff_ffv1_init_slice_state
av_cold int ff_ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:67
VlcState::drift
int16_t drift
Definition: ffv1.h:62
AVCodecContext::height
int height
Definition: avcodec.h:1711
FFV1Context::context_count
int context_count[MAX_QUANT_TABLES]
Definition: ffv1.h:106
avcodec.h
Libavcodec external API header.
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
AC_GOLOMB_RICE
#define AC_GOLOMB_RICE
Definition: ffv1.h:56
VlcState::error_sum
uint16_t error_sum
Definition: ffv1.h:63
CONTEXT_SIZE
#define CONTEXT_SIZE
Definition: ffv1.h:51
PlaneContext::quant_table_index
int quant_table_index
Definition: ffv1.h:70
internal.h
common internal api header.
ff_ffv1_clear_slice_state
void ff_ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs)
Definition: ffv1.c:177
PlaneContext::state
uint8_t(* state)[CONTEXT_SIZE]
Definition: ffv1.h:72
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1574
FFV1Context::plane
PlaneContext plane[MAX_PLANES]
Definition: ffv1.h:103
FFV1Context::transparency
int transparency
Definition: ffv1.h:92
FFV1Context::slice_context
struct FFV1Context * slice_context[MAX_SLICES]
Definition: ffv1.h:125
av_mallocz_array
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
PlaneContext::interlace_bit_state
uint8_t interlace_bit_state[2]
Definition: ffv1.h:74
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
FFV1Context::num_v_slices
int num_v_slices
Definition: ffv1.h:128
golomb.h
exp golomb vlc stuff
FFV1Context::avctx
AVCodecContext * avctx
Definition: ffv1.h:81
av_mallocz
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
FFV1Context::slice_x
int slice_x
Definition: ffv1.h:132
FFV1Context::width
int width
Definition: ffv1.h:89
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