FFmpeg
video.c
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1 /*
2  * Copyright 2007 Bobby Bingham
3  * Copyright Stefano Sabatini <stefasab gmail com>
4  * Copyright Vitor Sessak <vitor1001 gmail com>
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 #include <string.h>
24 #include <stdio.h>
25 
26 #include "libavutil/buffer.h"
27 #include "libavutil/hwcontext.h"
28 #include "libavutil/imgutils.h"
29 
30 #include "avfilter.h"
31 #include "framepool.h"
32 #include "internal.h"
33 #include "video.h"
34 
35 #define BUFFER_ALIGN 32
36 
37 
39 {
40  return ff_get_video_buffer(link->dst->outputs[0], w, h);
41 }
42 
44 {
45  AVFrame *frame = NULL;
46  int pool_width = 0;
47  int pool_height = 0;
48  int pool_align = 0;
49  enum AVPixelFormat pool_format = AV_PIX_FMT_NONE;
50 
51  if (link->hw_frames_ctx &&
52  ((AVHWFramesContext*)link->hw_frames_ctx->data)->format == link->format) {
53  int ret;
55 
56  if (!frame)
57  return NULL;
58 
60  if (ret < 0)
62 
63  return frame;
64  }
65 
66  if (!link->frame_pool) {
69  if (!link->frame_pool)
70  return NULL;
71  } else {
72  if (ff_frame_pool_get_video_config(link->frame_pool,
73  &pool_width, &pool_height,
74  &pool_format, &pool_align) < 0) {
75  return NULL;
76  }
77 
78  if (pool_width != w || pool_height != h ||
79  pool_format != link->format || pool_align != BUFFER_ALIGN) {
80 
81  ff_frame_pool_uninit((FFFramePool **)&link->frame_pool);
84  if (!link->frame_pool)
85  return NULL;
86  }
87  }
88 
89  frame = ff_frame_pool_get(link->frame_pool);
90  if (!frame)
91  return NULL;
92 
93  frame->sample_aspect_ratio = link->sample_aspect_ratio;
94 
95  return frame;
96 }
97 
99 {
100  AVFrame *ret = NULL;
101 
103 
104  if (link->dstpad->get_buffer.video)
105  ret = link->dstpad->get_buffer.video(link, w, h);
106 
107  if (!ret)
109 
110  return ret;
111 }
ff_get_video_buffer
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:98
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
ff_frame_pool_video_init
FFFramePool * ff_frame_pool_video_init(AVBufferRef *(*alloc)(size_t size), int width, int height, enum AVPixelFormat format, int align)
Allocate and initialize a video frame pool.
Definition: framepool.c:51
AVBufferRef::data
uint8_t * data
The data buffer.
Definition: buffer.h:90
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
w
uint8_t w
Definition: llviddspenc.c:38
BUFFER_ALIGN
#define BUFFER_ALIGN
Definition: video.c:35
video.h
ff_default_get_video_buffer
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:43
FFFramePool
Frame pool.
Definition: framepool.c:30
ff_frame_pool_get_video_config
int ff_frame_pool_get_video_config(FFFramePool *pool, int *width, int *height, enum AVPixelFormat *format, int *align)
Get the video frame pool configuration.
Definition: framepool.c:156
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:99
ff_frame_pool_get
AVFrame * ff_frame_pool_get(FFFramePool *pool)
Allocate a new AVFrame, reussing old buffers from the pool when available.
Definition: framepool.c:194
link
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 link
Definition: filter_design.txt:23
NULL
#define NULL
Definition: coverity.c:32
ff_frame_pool_uninit
void ff_frame_pool_uninit(FFFramePool **pool)
Deallocate the frame pool.
Definition: framepool.c:282
FF_TPRINTF_START
#define FF_TPRINTF_START(ctx, func)
Definition: internal.h:268
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:376
buffer.h
ff_null_get_video_buffer
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:38
internal.h
AVHWFramesContext
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:124
av_buffer_allocz
AVBufferRef * av_buffer_allocz(size_t size)
Same as av_buffer_alloc(), except the returned buffer will be initialized to zero.
Definition: buffer.c:93
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
framepool.h
AVFrame::sample_aspect_ratio
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:391
AVFrame::hw_frames_ctx
AVBufferRef * hw_frames_ctx
For hwaccel-format frames, this should be a reference to the AVHWFramesContext describing the frame.
Definition: frame.h:607
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
avfilter.h
ff_tlog_link
void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
Definition: avfilter.c:396
imgutils.h
hwcontext.h
h
h
Definition: vp9dsp_template.c:2038
av_hwframe_get_buffer
int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
Allocate a new frame attached to the given AVHWFramesContext.
Definition: hwcontext.c:502
get_video_buffer
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: avf_concat.c:198