* commit 'be7c323176e2e5fcf30e3d2ff20975b2f936811b': Add a libwebp encoder Conflicts: Changelog doc/encoders.texi doc/general.texi libavcodec/version.h libavformat/img2enc.c Merged-by: Michael Niedermayer <michaelni@gmx.at>pull/51/head
Michael Niedermayer
11 years ago
commit
6fe5f770db
9 changed files with 361 additions and 5 deletions
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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 |
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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_image_copy(alt_frame->data, alt_frame->linesize, |
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frame->data, frame->linesize, |
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avctx->pix_fmt, frame->width, frame->height); |
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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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free(mw.mem); /* must use free() according to libwebp documentation */ |
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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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