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WebP encoder: extract out some methods into a separate helper library.

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This is the 2nd patch in preparation for using WebPAnimEncoder API for encoding
and muxing WebP images.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Urvang Joshi 2015-05-19 17:39:54 -07:00 committed by Michael Niedermayer
parent a0124b89e3
commit f99fed733d
4 changed files with 360 additions and 271 deletions
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2
libavcodec/Makefile
View File

@ -783,7 +783,7 @@ OBJS-$(CONFIG_LIBVPX_VP8_ENCODER) += libvpxenc.o
OBJS-$(CONFIG_LIBVPX_VP9_DECODER) += libvpxdec.o libvpx.o OBJS-$(CONFIG_LIBVPX_VP9_DECODER) += libvpxdec.o libvpx.o
OBJS-$(CONFIG_LIBVPX_VP9_ENCODER) += libvpxenc.o libvpx.o OBJS-$(CONFIG_LIBVPX_VP9_ENCODER) += libvpxenc.o libvpx.o
OBJS-$(CONFIG_LIBWAVPACK_ENCODER) += libwavpackenc.o OBJS-$(CONFIG_LIBWAVPACK_ENCODER) += libwavpackenc.o
OBJS-$(CONFIG_LIBWEBP_ENCODER) += libwebpenc.o OBJS-$(CONFIG_LIBWEBP_ENCODER) += libwebpenc_common.o libwebpenc.o
OBJS-$(CONFIG_LIBX264_ENCODER) += libx264.o OBJS-$(CONFIG_LIBX264_ENCODER) += libx264.o
OBJS-$(CONFIG_LIBX265_ENCODER) += libx265.o OBJS-$(CONFIG_LIBX265_ENCODER) += libx265.o
OBJS-$(CONFIG_LIBXAVS_ENCODER) += libxavs.o OBJS-$(CONFIG_LIBXAVS_ENCODER) += libxavs.o

279
libavcodec/libwebpenc.c
View File

@ -21,254 +21,29 @@
/** /**
* @file * @file
* WebP encoder using libwebp * WebP encoder using libwebp (WebPEncode API)
*/ */
#include <webp/encode.h> #include "libwebpenc_common.h"
#include "libavutil/common.h" typedef LibWebPContextCommon LibWebPContext;
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
typedef struct LibWebPContext {
AVClass *class; // class for AVOptions
float quality; // lossy quality 0 - 100
int lossless; // use lossless encoding
int preset; // configuration preset
int chroma_warning; // chroma linesize mismatch warning has been printed
int conversion_warning; // pixel format conversion warning has been printed
WebPConfig config; // libwebp configuration
AVFrame *ref;
int cr_size;
int cr_threshold;
} LibWebPContext;
static int libwebp_error_to_averror(int err)
{
switch (err) {
case VP8_ENC_ERROR_OUT_OF_MEMORY:
case VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY:
return AVERROR(ENOMEM);
case VP8_ENC_ERROR_NULL_PARAMETER:
case VP8_ENC_ERROR_INVALID_CONFIGURATION:
case VP8_ENC_ERROR_BAD_DIMENSION:
return AVERROR(EINVAL);
}
return AVERROR_UNKNOWN;
}
static av_cold int libwebp_encode_init(AVCodecContext *avctx) static av_cold int libwebp_encode_init(AVCodecContext *avctx)
{ {
LibWebPContext *s = avctx->priv_data; return ff_libwebp_encode_init_common(avctx);
int ret;
if (avctx->global_quality >= 0)
s->quality = av_clipf(avctx->global_quality / (float)FF_QP2LAMBDA,
0.0f, 100.0f);
if (avctx->compression_level < 0 || avctx->compression_level > 6) {
av_log(avctx, AV_LOG_WARNING, "invalid compression level: %d\n",
avctx->compression_level);
avctx->compression_level = av_clip(avctx->compression_level, 0, 6);
}
if (s->preset >= WEBP_PRESET_DEFAULT) {
ret = WebPConfigPreset(&s->config, s->preset, s->quality);
if (!ret)
return AVERROR_UNKNOWN;
s->lossless = s->config.lossless;
s->quality = s->config.quality;
avctx->compression_level = s->config.method;
} else {
ret = WebPConfigInit(&s->config);
if (!ret)
return AVERROR_UNKNOWN;
s->config.lossless = s->lossless;
s->config.quality = s->quality;
s->config.method = avctx->compression_level;
ret = WebPValidateConfig(&s->config);
if (!ret)
return AVERROR(EINVAL);
}
av_log(avctx, AV_LOG_DEBUG, "%s - quality=%.1f method=%d\n",
s->lossless ? "Lossless" : "Lossy", s->quality,
avctx->compression_level);
return 0;
} }
static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet) const AVFrame *frame, int *got_packet)
{ {
LibWebPContext *s = avctx->priv_data; LibWebPContext *s = avctx->priv_data;
AVFrame *alt_frame = NULL;
WebPPicture *pic = NULL; WebPPicture *pic = NULL;
AVFrame *alt_frame = NULL;
WebPMemoryWriter mw = { 0 }; WebPMemoryWriter mw = { 0 };
int ret;
if (avctx->width > WEBP_MAX_DIMENSION || avctx->height > WEBP_MAX_DIMENSION) { int ret = ff_libwebp_get_frame(avctx, s, frame, &alt_frame, &pic);
av_log(avctx, AV_LOG_ERROR, "Picture size is too large. Max is %dx%d.\n", if (ret < 0)
WEBP_MAX_DIMENSION, WEBP_MAX_DIMENSION);
return AVERROR(EINVAL);
}
pic = av_malloc(sizeof(*pic));
if (!pic)
return AVERROR(ENOMEM);
ret = WebPPictureInit(pic);
if (!ret) {
ret = AVERROR_UNKNOWN;
goto end; goto end;
}
pic->width = avctx->width;
pic->height = avctx->height;
if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
if (!s->lossless) {
/* libwebp will automatically convert RGB input to YUV when
encoding lossy. */
if (!s->conversion_warning) {
av_log(avctx, AV_LOG_WARNING,
"Using libwebp for RGB-to-YUV conversion. You may want "
"to consider passing in YUV instead for lossy "
"encoding.\n");
s->conversion_warning = 1;
}
}
pic->use_argb = 1;
pic->argb = (uint32_t *)frame->data[0];
pic->argb_stride = frame->linesize[0] / 4;
} else {
if (frame->linesize[1] != frame->linesize[2] || s->cr_threshold) {
if (!s->chroma_warning && !s->cr_threshold) {
av_log(avctx, AV_LOG_WARNING,
"Copying frame due to differing chroma linesizes.\n");
s->chroma_warning = 1;
}
alt_frame = av_frame_alloc();
if (!alt_frame) {
ret = AVERROR(ENOMEM);
goto end;
}
alt_frame->width = frame->width;
alt_frame->height = frame->height;
alt_frame->format = frame->format;
if (s->cr_threshold)
alt_frame->format = AV_PIX_FMT_YUVA420P;
ret = av_frame_get_buffer(alt_frame, 32);
if (ret < 0)
goto end;
alt_frame->format = frame->format;
av_frame_copy(alt_frame, frame);
frame = alt_frame;
if (s->cr_threshold) {
int x,y, x2, y2, p;
int bs = s->cr_size;
if (!s->ref) {
s->ref = av_frame_clone(frame);
if (!s->ref) {
ret = AVERROR(ENOMEM);
goto end;
}
}
alt_frame->format = AV_PIX_FMT_YUVA420P;
for (y = 0; y < frame->height; y+= bs) {
for (x = 0; x < frame->width; x+= bs) {
int skip;
int sse = 0;
for (p = 0; p < 3; p++) {
int bs2 = bs >> !!p;
int w = FF_CEIL_RSHIFT(frame->width , !!p);
int h = FF_CEIL_RSHIFT(frame->height, !!p);
int xs = x >> !!p;
int ys = y >> !!p;
for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
for (x2 = xs; x2 < FFMIN(xs + bs2, w); x2++) {
int diff = frame->data[p][frame->linesize[p] * y2 + x2]
-s->ref->data[p][frame->linesize[p] * y2 + x2];
sse += diff*diff;
}
}
}
skip = sse < s->cr_threshold && frame->data[3] != s->ref->data[3];
if (!skip)
for (p = 0; p < 3; p++) {
int bs2 = bs >> !!p;
int w = FF_CEIL_RSHIFT(frame->width , !!p);
int h = FF_CEIL_RSHIFT(frame->height, !!p);
int xs = x >> !!p;
int ys = y >> !!p;
for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
memcpy(&s->ref->data[p][frame->linesize[p] * y2 + xs],
& frame->data[p][frame->linesize[p] * y2 + xs], FFMIN(bs2, w-xs));
}
}
for (y2 = y; y2 < FFMIN(y+bs, frame->height); y2++) {
memset(&frame->data[3][frame->linesize[3] * y2 + x],
skip ? 0 : 255,
FFMIN(bs, frame->width-x));
}
}
}
}
}
pic->use_argb = 0;
pic->y = frame->data[0];
pic->u = frame->data[1];
pic->v = frame->data[2];
pic->y_stride = frame->linesize[0];
pic->uv_stride = frame->linesize[1];
if (frame->format == AV_PIX_FMT_YUVA420P) {
pic->colorspace = WEBP_YUV420A;
pic->a = frame->data[3];
pic->a_stride = frame->linesize[3];
if (alt_frame)
WebPCleanupTransparentArea(pic);
} else {
pic->colorspace = WEBP_YUV420;
}
if (s->lossless) {
/* We do not have a way to automatically prioritize RGB over YUV
in automatic pixel format conversion based on whether we're
encoding lossless or lossy, so we do conversion with libwebp as
a convenience. */
if (!s->conversion_warning) {
av_log(avctx, AV_LOG_WARNING,
"Using libwebp for YUV-to-RGB conversion. You may want "
"to consider passing in RGB instead for lossless "
"encoding.\n");
s->conversion_warning = 1;
}
#if (WEBP_ENCODER_ABI_VERSION <= 0x201)
/* libwebp should do the conversion automatically, but there is a
bug that causes it to return an error instead, so a work-around
is required.
See https://code.google.com/p/webp/issues/detail?id=178 */
pic->memory_ = (void*)1; /* something non-null */
ret = WebPPictureYUVAToARGB(pic);
if (!ret) {
av_log(avctx, AV_LOG_ERROR,
"WebPPictureYUVAToARGB() failed with error: %d\n",
pic->error_code);
ret = libwebp_error_to_averror(pic->error_code);
goto end;
}
pic->memory_ = NULL; /* restore pointer */
#endif
}
}
WebPMemoryWriterInit(&mw); WebPMemoryWriterInit(&mw);
pic->custom_ptr = &mw; pic->custom_ptr = &mw;
@ -278,7 +53,7 @@ static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
if (!ret) { if (!ret) {
av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n", av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n",
pic->error_code); pic->error_code);
ret = libwebp_error_to_averror(pic->error_code); ret = ff_libwebp_error_to_averror(pic->error_code);
goto end; goto end;
} }
@ -305,45 +80,9 @@ end:
static int libwebp_encode_close(AVCodecContext *avctx) static int libwebp_encode_close(AVCodecContext *avctx)
{ {
LibWebPContext *s = avctx->priv_data; return ff_libwebp_encode_close_common(avctx);
av_frame_free(&s->ref);
return 0;
} }
#define OFFSET(x) offsetof(LibWebPContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "lossless", "Use lossless mode", OFFSET(lossless), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
{ "preset", "Configuration preset", OFFSET(preset), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, WEBP_PRESET_TEXT, VE, "preset" },
{ "none", "do not use a preset", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, "preset" },
{ "default", "default preset", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DEFAULT }, 0, 0, VE, "preset" },
{ "picture", "digital picture, like portrait, inner shot", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PICTURE }, 0, 0, VE, "preset" },
{ "photo", "outdoor photograph, with natural lighting", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PHOTO }, 0, 0, VE, "preset" },
{ "drawing", "hand or line drawing, with high-contrast details", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DRAWING }, 0, 0, VE, "preset" },
{ "icon", "small-sized colorful images", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_ICON }, 0, 0, VE, "preset" },
{ "text", "text-like", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_TEXT }, 0, 0, VE, "preset" },
{ "cr_threshold","Conditional replenishment threshold", OFFSET(cr_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
{ "cr_size" ,"Conditional replenishment block size", OFFSET(cr_size) , AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 256, VE },
{ "quality" ,"Quality", OFFSET(quality), AV_OPT_TYPE_FLOAT, { .dbl = 75 }, 0, 100, VE },
{ NULL },
};
static const AVClass class = {
.class_name = "libwebp",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVCodecDefault libwebp_defaults[] = {
{ "compression_level", "4" },
{ "global_quality", "-1" },
{ NULL },
};
AVCodec ff_libwebp_encoder = { AVCodec ff_libwebp_encoder = {
.name = "libwebp", .name = "libwebp",
.long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"), .long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),

261
libavcodec/libwebpenc_common.c Normal file
View File

@ -0,0 +1,261 @@
/*
* WebP encoding support via libwebp
* Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* WebP encoder using libwebp: common structs and methods.
*/
#include "libwebpenc_common.h"
int ff_libwebp_error_to_averror(int err)
{
switch (err) {
case VP8_ENC_ERROR_OUT_OF_MEMORY:
case VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY:
return AVERROR(ENOMEM);
case VP8_ENC_ERROR_NULL_PARAMETER:
case VP8_ENC_ERROR_INVALID_CONFIGURATION:
case VP8_ENC_ERROR_BAD_DIMENSION:
return AVERROR(EINVAL);
}
return AVERROR_UNKNOWN;
}
av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
{
LibWebPContextCommon *s = avctx->priv_data;
int ret;
if (avctx->global_quality >= 0)
s->quality = av_clipf(avctx->global_quality / (float)FF_QP2LAMBDA,
0.0f, 100.0f);
if (avctx->compression_level < 0 || avctx->compression_level > 6) {
av_log(avctx, AV_LOG_WARNING, "invalid compression level: %d\n",
avctx->compression_level);
avctx->compression_level = av_clip(avctx->compression_level, 0, 6);
}
if (s->preset >= WEBP_PRESET_DEFAULT) {
ret = WebPConfigPreset(&s->config, s->preset, s->quality);
if (!ret)
return AVERROR_UNKNOWN;
s->lossless = s->config.lossless;
s->quality = s->config.quality;
avctx->compression_level = s->config.method;
} else {
ret = WebPConfigInit(&s->config);
if (!ret)
return AVERROR_UNKNOWN;
s->config.lossless = s->lossless;
s->config.quality = s->quality;
s->config.method = avctx->compression_level;
ret = WebPValidateConfig(&s->config);
if (!ret)
return AVERROR(EINVAL);
}
av_log(avctx, AV_LOG_DEBUG, "%s - quality=%.1f method=%d\n",
s->lossless ? "Lossless" : "Lossy", s->quality,
avctx->compression_level);
return 0;
}
int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s,
const AVFrame *frame, AVFrame **alt_frame_ptr,
WebPPicture **pic_ptr) {
int ret;
WebPPicture *pic = NULL;
AVFrame *alt_frame = NULL;
if (avctx->width > WEBP_MAX_DIMENSION || avctx->height > WEBP_MAX_DIMENSION) {
av_log(avctx, AV_LOG_ERROR, "Picture size is too large. Max is %dx%d.\n",
WEBP_MAX_DIMENSION, WEBP_MAX_DIMENSION);
return AVERROR(EINVAL);
}
*pic_ptr = av_malloc(sizeof(*pic));
pic = *pic_ptr;
if (!pic)
return AVERROR(ENOMEM);
ret = WebPPictureInit(pic);
if (!ret) {
ret = AVERROR_UNKNOWN;
goto end;
}
pic->width = avctx->width;
pic->height = avctx->height;
if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
if (!s->lossless) {
/* libwebp will automatically convert RGB input to YUV when
encoding lossy. */
if (!s->conversion_warning) {
av_log(avctx, AV_LOG_WARNING,
"Using libwebp for RGB-to-YUV conversion. You may want "
"to consider passing in YUV instead for lossy "
"encoding.\n");
s->conversion_warning = 1;
}
}
pic->use_argb = 1;
pic->argb = (uint32_t *)frame->data[0];
pic->argb_stride = frame->linesize[0] / 4;
} else {
if (frame->linesize[1] != frame->linesize[2] || s->cr_threshold) {
if (!s->chroma_warning && !s->cr_threshold) {
av_log(avctx, AV_LOG_WARNING,
"Copying frame due to differing chroma linesizes.\n");
s->chroma_warning = 1;
}
*alt_frame_ptr = av_frame_alloc();
alt_frame = *alt_frame_ptr;
if (!alt_frame) {
ret = AVERROR(ENOMEM);
goto end;
}
alt_frame->width = frame->width;
alt_frame->height = frame->height;
alt_frame->format = frame->format;
if (s->cr_threshold)
alt_frame->format = AV_PIX_FMT_YUVA420P;
ret = av_frame_get_buffer(alt_frame, 32);
if (ret < 0)
goto end;
alt_frame->format = frame->format;
av_frame_copy(alt_frame, frame);
frame = alt_frame;
if (s->cr_threshold) {
int x,y, x2, y2, p;
int bs = s->cr_size;
if (!s->ref) {
s->ref = av_frame_clone(frame);
if (!s->ref) {
ret = AVERROR(ENOMEM);
goto end;
}
}
alt_frame->format = AV_PIX_FMT_YUVA420P;
for (y = 0; y < frame->height; y+= bs) {
for (x = 0; x < frame->width; x+= bs) {
int skip;
int sse = 0;
for (p = 0; p < 3; p++) {
int bs2 = bs >> !!p;
int w = FF_CEIL_RSHIFT(frame->width , !!p);
int h = FF_CEIL_RSHIFT(frame->height, !!p);
int xs = x >> !!p;
int ys = y >> !!p;
for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
for (x2 = xs; x2 < FFMIN(xs + bs2, w); x2++) {
int diff = frame->data[p][frame->linesize[p] * y2 + x2]
-s->ref->data[p][frame->linesize[p] * y2 + x2];
sse += diff*diff;
}
}
}
skip = sse < s->cr_threshold && frame->data[3] != s->ref->data[3];
if (!skip)
for (p = 0; p < 3; p++) {
int bs2 = bs >> !!p;
int w = FF_CEIL_RSHIFT(frame->width , !!p);
int h = FF_CEIL_RSHIFT(frame->height, !!p);
int xs = x >> !!p;
int ys = y >> !!p;
for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
memcpy(&s->ref->data[p][frame->linesize[p] * y2 + xs],
& frame->data[p][frame->linesize[p] * y2 + xs], FFMIN(bs2, w-xs));
}
}
for (y2 = y; y2 < FFMIN(y+bs, frame->height); y2++) {
memset(&frame->data[3][frame->linesize[3] * y2 + x],
skip ? 0 : 255,
FFMIN(bs, frame->width-x));
}
}
}
}
}
pic->use_argb = 0;
pic->y = frame->data[0];
pic->u = frame->data[1];
pic->v = frame->data[2];
pic->y_stride = frame->linesize[0];
pic->uv_stride = frame->linesize[1];
if (frame->format == AV_PIX_FMT_YUVA420P) {
pic->colorspace = WEBP_YUV420A;
pic->a = frame->data[3];
pic->a_stride = frame->linesize[3];
if (alt_frame)
WebPCleanupTransparentArea(pic);
} else {
pic->colorspace = WEBP_YUV420;
}
if (s->lossless) {
/* We do not have a way to automatically prioritize RGB over YUV
in automatic pixel format conversion based on whether we're
encoding lossless or lossy, so we do conversion with libwebp as
a convenience. */
if (!s->conversion_warning) {
av_log(avctx, AV_LOG_WARNING,
"Using libwebp for YUV-to-RGB conversion. You may want "
"to consider passing in RGB instead for lossless "
"encoding.\n");
s->conversion_warning = 1;
}
#if (WEBP_ENCODER_ABI_VERSION <= 0x201)
/* libwebp should do the conversion automatically, but there is a
bug that causes it to return an error instead, so a work-around
is required.
See https://code.google.com/p/webp/issues/detail?id=178 */
pic->memory_ = (void*)1; /* something non-null */
ret = WebPPictureYUVAToARGB(pic);
if (!ret) {
av_log(avctx, AV_LOG_ERROR,
"WebPPictureYUVAToARGB() failed with error: %d\n",
pic->error_code);
ret = libwebp_error_to_averror(pic->error_code);
goto end;
}
pic->memory_ = NULL; /* restore pointer */
#endif
}
}
end:
return ret;
}
int ff_libwebp_encode_close_common(AVCodecContext *avctx)
{
LibWebPContextCommon *s = avctx->priv_data;
av_frame_free(&s->ref);
return 0;
}

89
libavcodec/libwebpenc_common.h Normal file
View File

@ -0,0 +1,89 @@
/*
* WebP encoding support via libwebp
* Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* WebP encoder using libwebp: common structs and methods.
*/
#include <webp/encode.h>
#include "libavutil/common.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
typedef struct LibWebPContextCommon {
AVClass *class; // class for AVOptions
float quality; // lossy quality 0 - 100
int lossless; // use lossless encoding
int preset; // configuration preset
int chroma_warning; // chroma linesize mismatch warning has been printed
int conversion_warning; // pixel format conversion warning has been printed
WebPConfig config; // libwebp configuration
AVFrame *ref;
int cr_size;
int cr_threshold;
} LibWebPContextCommon;
int ff_libwebp_error_to_averror(int err);
av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx);
int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s,
const AVFrame *frame, AVFrame **alt_frame_ptr,
WebPPicture **pic_ptr);
int ff_libwebp_encode_close_common(AVCodecContext *avctx);
#define OFFSET(x) offsetof(LibWebPContextCommon, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "lossless", "Use lossless mode", OFFSET(lossless), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
{ "preset", "Configuration preset", OFFSET(preset), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, WEBP_PRESET_TEXT, VE, "preset" },
{ "none", "do not use a preset", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, "preset" },
{ "default", "default preset", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DEFAULT }, 0, 0, VE, "preset" },
{ "picture", "digital picture, like portrait, inner shot", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PICTURE }, 0, 0, VE, "preset" },
{ "photo", "outdoor photograph, with natural lighting", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PHOTO }, 0, 0, VE, "preset" },
{ "drawing", "hand or line drawing, with high-contrast details", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DRAWING }, 0, 0, VE, "preset" },
{ "icon", "small-sized colorful images", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_ICON }, 0, 0, VE, "preset" },
{ "text", "text-like", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_TEXT }, 0, 0, VE, "preset" },
{ "cr_threshold","Conditional replenishment threshold", OFFSET(cr_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
{ "cr_size" ,"Conditional replenishment block size", OFFSET(cr_size) , AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 256, VE },
{ "quality" ,"Quality", OFFSET(quality), AV_OPT_TYPE_FLOAT, { .dbl = 75 }, 0, 100, VE },
{ NULL },
};
static const AVClass class = {
.class_name = "libwebp",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVCodecDefault libwebp_defaults[] = {
{ "compression_level", "4" },
{ "global_quality", "-1" },
{ NULL },
};