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