FFmpeg
libwebpenc.c
Go to the documentation of this file.
1 /*
2  * WebP encoding support via libwebp
3  * Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * WebP encoder using libwebp (WebPEncode API)
25  */
26 
27 #include "libwebpenc_common.h"
28 
30 
32 {
33  return ff_libwebp_encode_init_common(avctx);
34 }
35 
37  const AVFrame *frame, int *got_packet)
38 {
39  LibWebPContext *s = avctx->priv_data;
40  WebPPicture *pic = NULL;
41  AVFrame *alt_frame = NULL;
42  WebPMemoryWriter mw = { 0 };
43 
44  int ret = ff_libwebp_get_frame(avctx, s, frame, &alt_frame, &pic);
45  if (ret < 0)
46  goto end;
47 
48  WebPMemoryWriterInit(&mw);
49  pic->custom_ptr = &mw;
50  pic->writer = WebPMemoryWrite;
51 
52  ret = WebPEncode(&s->config, pic);
53  if (!ret) {
54  av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n",
55  pic->error_code);
56  ret = ff_libwebp_error_to_averror(pic->error_code);
57  goto end;
58  }
59 
60  ret = ff_alloc_packet2(avctx, pkt, mw.size, mw.size);
61  if (ret < 0)
62  goto end;
63  memcpy(pkt->data, mw.mem, mw.size);
64 
66  *got_packet = 1;
67 
68 end:
69 #if (WEBP_ENCODER_ABI_VERSION > 0x0203)
70  WebPMemoryWriterClear(&mw);
71 #else
72  free(mw.mem); /* must use free() according to libwebp documentation */
73 #endif
74  WebPPictureFree(pic);
75  av_freep(&pic);
76  av_frame_free(&alt_frame);
77 
78  return ret;
79 }
80 
82 {
84  av_frame_free(&s->ref);
85 
86  return 0;
87 }
88 
89 static const AVClass class = {
90  .class_name = "libwebp",
91  .item_name = av_default_item_name,
92  .option = options,
94 };
95 
97  .name = "libwebp",
98  .long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
99  .type = AVMEDIA_TYPE_VIDEO,
100  .id = AV_CODEC_ID_WEBP,
101  .priv_data_size = sizeof(LibWebPContext),
103  .encode2 = libwebp_encode_frame,
104  .close = libwebp_encode_close,
105  .pix_fmts = (const enum AVPixelFormat[]) {
109  },
110  .priv_class = &class,
111  .defaults = libwebp_defaults,
112  .wrapper_name = "libwebp",
113 };
AVCodec
AVCodec.
Definition: codec.h:197
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
ff_libwebp_error_to_averror
int ff_libwebp_error_to_averror(int err)
Definition: libwebpenc_common.c:29
libwebp_defaults
static const AVCodecDefault libwebp_defaults[]
Definition: libwebpenc_common.h:78
ff_libwebp_encode_init_common
av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
Definition: libwebpenc_common.c: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:111
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
AVPacket::data
uint8_t * data
Definition: packet.h:365
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:396
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
av_cold
#define av_cold
Definition: attributes.h:90
s
#define s(width, name)
Definition: cbs_vp9.c:257
AV_PIX_FMT_YUVA420P
@ AV_PIX_FMT_YUVA420P
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:289
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
options
const OptionDef options[]
AVPacket::size
int size
Definition: packet.h:366
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AV_PIX_FMT_RGB32
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:362
LibWebPContextCommon
Definition: libwebpenc_common.h:39
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:371
libwebp_encode_frame
static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: libwebpenc.c:36
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:204
AV_CODEC_ID_WEBP
@ AV_CODEC_ID_WEBP
Definition: codec_id.h:221
ff_libwebp_encoder
const AVCodec ff_libwebp_encoder
Definition: libwebpenc.c:96
ret
ret
Definition: filter_design.txt:187
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
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
libwebp_encode_init
static av_cold int libwebp_encode_init(AVCodecContext *avctx)
Definition: libwebpenc.c:31
AVCodecContext
main external API structure.
Definition: avcodec.h:501
libwebp_encode_close
static int libwebp_encode_close(AVCodecContext *avctx)
Definition: libwebpenc.c:81
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
ff_libwebp_get_frame
int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s, const AVFrame *frame, AVFrame **alt_frame_ptr, WebPPicture **pic_ptr)
Definition: libwebpenc_common.c:86
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:528
AVPacket
This structure stores compressed data.
Definition: packet.h:342
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
libwebpenc_common.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
LibWebPContext
LibWebPContextCommon LibWebPContext
Definition: libwebpenc.c:29
ff_alloc_packet2
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: encode.c:33