FFmpeg
libwebpenc.c
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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 
65  pkt->flags |= AV_PKT_FLAG_KEY;
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 };
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)
Definition: libwebpenc.c:36
int size
Definition: avcodec.h:1478
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static int libwebp_encode_close(AVCodecContext *avctx)
Definition: libwebpenc.c:81
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3481
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
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:32
planar YUV 4:2:0, 20bpp, (1 Cr & Cb sample per 2x2 Y & A samples)
Definition: pixfmt.h:101
#define av_cold
Definition: attributes.h:82
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
uint8_t * data
Definition: avcodec.h:1477
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
WebP encoder using libwebp: common structs and methods.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s, const AVFrame *frame, AVFrame **alt_frame_ptr, WebPPicture **pic_ptr)
av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1483
LibWebPContextCommon LibWebPContext
Definition: libwebpenc.c:29
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
#define s(width, name)
Definition: cbs_vp9.c:257
static const AVCodecDefault libwebp_defaults[]
static av_cold int libwebp_encode_init(AVCodecContext *avctx)
Definition: libwebpenc.c:31
int ff_libwebp_error_to_averror(int err)
main external API structure.
Definition: avcodec.h:1565
#define AV_PIX_FMT_RGB32
Definition: pixfmt.h:360
Describe the class of an AVClass context structure.
Definition: log.h:67
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
const OptionDef options[]
Definition: ffmpeg_opt.c:3364
void * priv_data
Definition: avcodec.h:1592
#define av_freep(p)
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodec ff_libwebp_encoder
Definition: libwebpenc.c:96