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/avassert.h"
27 #include "libavutil/buffer.h"
28 #include "libavutil/hwcontext.h"
29 #include "libavutil/imgutils.h"
30 #include "libavutil/mem.h"
31 
32 #include "avfilter.h"
33 #include "internal.h"
34 #include "video.h"
35 
36 #define BUFFER_ALIGN 32
37 
38 
40 {
41  return ff_get_video_buffer(link->dst->outputs[0], w, h);
42 }
43 
45 {
46  AVFrame *frame = NULL;
47  int pool_width = 0;
48  int pool_height = 0;
49  int pool_align = 0;
50  enum AVPixelFormat pool_format = AV_PIX_FMT_NONE;
51 
52  if (link->hw_frames_ctx &&
53  ((AVHWFramesContext*)link->hw_frames_ctx->data)->format == link->format) {
54  int ret;
55  AVFrame *frame = av_frame_alloc();
56 
57  if (!frame)
58  return NULL;
59 
60  ret = av_hwframe_get_buffer(link->hw_frames_ctx, frame, 0);
61  if (ret < 0)
62  av_frame_free(&frame);
63 
64  return frame;
65  }
66 
67  if (!link->frame_pool) {
69  link->format, BUFFER_ALIGN);
70  if (!link->frame_pool)
71  return NULL;
72  } else {
74  &pool_width, &pool_height,
75  &pool_format, &pool_align) < 0) {
76  return NULL;
77  }
78 
79  if (pool_width != w || pool_height != h ||
80  pool_format != link->format || pool_align != BUFFER_ALIGN) {
81 
84  link->format, BUFFER_ALIGN);
85  if (!link->frame_pool)
86  return NULL;
87  }
88  }
89 
90  frame = ff_frame_pool_get(link->frame_pool);
91  if (!frame)
92  return NULL;
93 
95 
96  return frame;
97 }
98 
100 {
101  AVFrame *ret = NULL;
102 
104 
105  if (link->dstpad->get_video_buffer)
106  ret = link->dstpad->get_video_buffer(link, w, h);
107 
108  if (!ret)
109  ret = ff_default_get_video_buffer(link, w, h);
110 
111  return ret;
112 }
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
misc image utilities
AVFrame * ff_frame_pool_get(FFFramePool *pool)
Allocate a new AVFrame, reussing old buffers from the pool when available.
Definition: framepool.c:195
Main libavfilter public API header.
Memory handling functions.
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:39
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:99
void ff_frame_pool_uninit(FFFramePool **pool)
Deallocate the frame pool.
Definition: framepool.c:284
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: avf_concat.c:199
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
simple assert() macros that are a bit more flexible than ISO C assert().
#define FF_TPRINTF_START(ctx, func)
Definition: internal.h:250
FFFramePool * ff_frame_pool_video_init(AVBufferRef *(*alloc)(int size), int width, int height, enum AVPixelFormat format, int align)
Allocate and initialize a video frame pool.
Definition: framepool.c:51
Frame pool.
Definition: framepool.c:30
int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
Allocate a new frame attached to the given AVHWFramesContext.
Definition: hwcontext.c:465
AVFrame *(* get_video_buffer)(AVFilterLink *link, int w, int h)
Callback function to get a video buffer.
Definition: internal.h:73
uint8_t w
Definition: llviddspenc.c:38
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
void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
Definition: avfilter.c:383
uint8_t * data
The data buffer.
Definition: buffer.h:89
AVRational sample_aspect_ratio
Sample aspect ratio for the video frame, 0/1 if unknown/unspecified.
Definition: frame.h:383
AVBufferRef * av_buffer_allocz(int size)
Same as av_buffer_alloc(), except the returned buffer will be initialized to zero.
Definition: buffer.c:83
This struct describes a set or pool of "hardware" frames (i.e.
Definition: hwcontext.h:123
refcounted data buffer API
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
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:350
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:157
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:44
#define BUFFER_ALIGN
Definition: video.c:36
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64