mirror of https://git.ffmpeg.org/ffmpeg.git
255 lines
9.6 KiB
C
255 lines
9.6 KiB
C
/*
|
|
* 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, 0);
|
|
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 = AV_CEIL_RSHIFT(frame->width , !!p);
|
|
int h = AV_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 = AV_CEIL_RSHIFT(frame->width , !!p);
|
|
int h = AV_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;
|
|
}
|