| /* |
| * 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 |
| */ |
| |
| #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 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 |
| } 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) |
| { |
| LibWebPContext *s = avctx->priv_data; |
| int ret; |
| |
| if (avctx->global_quality < 0) |
| avctx->global_quality = 75 * FF_QP2LAMBDA; |
| 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, |
| const AVFrame *frame, int *got_packet) |
| { |
| LibWebPContext *s = avctx->priv_data; |
| AVFrame *alt_frame = NULL; |
| WebPPicture *pic = NULL; |
| WebPMemoryWriter mw = { 0 }; |
| int ret; |
| |
| 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 = av_malloc(sizeof(*pic)); |
| 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]) { |
| if (!s->chroma_warning) { |
| 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; |
| ret = av_frame_get_buffer(alt_frame, 32); |
| if (ret < 0) |
| goto end; |
| av_frame_copy(alt_frame, frame); |
| frame = alt_frame; |
| } |
| 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 (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) { |
| pic->colorspace = WEBP_YUV420A; |
| pic->a = frame->data[3]; |
| pic->a_stride = frame->linesize[3]; |
| } 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); |
| pic->custom_ptr = &mw; |
| pic->writer = WebPMemoryWrite; |
| |
| ret = WebPEncode(&s->config, pic); |
| if (!ret) { |
| av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n", |
| pic->error_code); |
| ret = libwebp_error_to_averror(pic->error_code); |
| goto end; |
| } |
| |
| ret = ff_alloc_packet(pkt, mw.size); |
| if (ret < 0) |
| goto end; |
| memcpy(pkt->data, mw.mem, mw.size); |
| |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| *got_packet = 1; |
| |
| end: |
| free(mw.mem); /* must use free() according to libwebp documentation */ |
| WebPPictureFree(pic); |
| av_freep(&pic); |
| av_frame_free(&alt_frame); |
| |
| return ret; |
| } |
| |
| #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" }, |
| { 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 = { |
| .name = "libwebp", |
| .long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_WEBP, |
| .priv_data_size = sizeof(LibWebPContext), |
| .init = libwebp_encode_init, |
| .encode2 = libwebp_encode_frame, |
| .pix_fmts = (const enum AVPixelFormat[]) { |
| AV_PIX_FMT_RGB32, |
| AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, |
| AV_PIX_FMT_NONE |
| }, |
| .priv_class = &class, |
| .defaults = libwebp_defaults, |
| }; |