mirror of https://git.ffmpeg.org/ffmpeg.git
290 lines
10 KiB
C
290 lines
10 KiB
C
/*
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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
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*/
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#include <webp/encode.h>
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#include "libavutil/common.h"
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#include "libavutil/frame.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "internal.h"
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typedef struct LibWebPContext {
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AVClass *class; // class for AVOptions
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float quality; // lossy quality 0 - 100
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int lossless; // use lossless encoding
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int preset; // configuration preset
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int chroma_warning; // chroma linesize mismatch warning has been printed
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int conversion_warning; // pixel format conversion warning has been printed
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WebPConfig config; // libwebp configuration
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} LibWebPContext;
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static int 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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static av_cold int libwebp_encode_init(AVCodecContext *avctx)
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{
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LibWebPContext *s = avctx->priv_data;
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int ret;
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if (avctx->global_quality < 0)
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avctx->global_quality = 75 * FF_QP2LAMBDA;
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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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static int libwebp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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LibWebPContext *s = avctx->priv_data;
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AVFrame *alt_frame = NULL;
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WebPPicture *pic = NULL;
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WebPMemoryWriter mw = { 0 };
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int ret;
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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 = av_malloc(sizeof(*pic));
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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]) {
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if (!s->chroma_warning) {
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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 = av_frame_alloc();
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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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ret = av_frame_get_buffer(alt_frame, 32);
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if (ret < 0)
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goto end;
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av_frame_copy(alt_frame, frame);
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frame = alt_frame;
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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 (avctx->pix_fmt == 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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} 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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WebPMemoryWriterInit(&mw);
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pic->custom_ptr = &mw;
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pic->writer = WebPMemoryWrite;
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ret = WebPEncode(&s->config, pic);
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if (!ret) {
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av_log(avctx, AV_LOG_ERROR, "WebPEncode() 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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ret = ff_alloc_packet(pkt, mw.size);
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if (ret < 0)
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goto end;
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memcpy(pkt->data, mw.mem, mw.size);
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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end:
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#if (WEBP_ENCODER_ABI_VERSION > 0x0203)
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WebPMemoryWriterClear(&mw);
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#else
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free(mw.mem); /* must use free() according to libwebp documentation */
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#endif
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WebPPictureFree(pic);
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av_freep(&pic);
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av_frame_free(&alt_frame);
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return ret;
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}
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#define OFFSET(x) offsetof(LibWebPContext, x)
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#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "lossless", "Use lossless mode", OFFSET(lossless), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
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{ "preset", "Configuration preset", OFFSET(preset), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, WEBP_PRESET_TEXT, VE, "preset" },
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{ "none", "do not use a preset", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, "preset" },
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{ "default", "default preset", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DEFAULT }, 0, 0, VE, "preset" },
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{ "picture", "digital picture, like portrait, inner shot", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PICTURE }, 0, 0, VE, "preset" },
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{ "photo", "outdoor photograph, with natural lighting", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PHOTO }, 0, 0, VE, "preset" },
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{ "drawing", "hand or line drawing, with high-contrast details", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DRAWING }, 0, 0, VE, "preset" },
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{ "icon", "small-sized colorful images", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_ICON }, 0, 0, VE, "preset" },
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{ "text", "text-like", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_TEXT }, 0, 0, VE, "preset" },
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{ NULL },
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};
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static const AVClass class = {
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.class_name = "libwebp",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVCodecDefault libwebp_defaults[] = {
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{ "compression_level", "4" },
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{ "global_quality", "-1" },
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{ NULL },
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};
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AVCodec ff_libwebp_encoder = {
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.name = "libwebp",
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.long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_WEBP,
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.priv_data_size = sizeof(LibWebPContext),
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.init = libwebp_encode_init,
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.encode2 = libwebp_encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]) {
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AV_PIX_FMT_RGB32,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_NONE
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},
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.priv_class = &class,
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.defaults = libwebp_defaults,
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};
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