[deb_ffmpeg.git] / ffmpeg / libavcodec / libwebpenc.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
 */

#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
    AVFrame *ref;
    int cr_size;
    int cr_threshold;
} 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)
        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] || 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 = 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;
            if (s->cr_threshold)
                alt_frame->format = AV_PIX_FMT_YUVA420P;
            ret = av_frame_get_buffer(alt_frame, 32);
            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 = FF_CEIL_RSHIFT(frame->width , !!p);
                            int h = FF_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 = FF_CEIL_RSHIFT(frame->width , !!p);
                                int h = FF_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
        }
    }

    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:
#if (WEBP_ENCODER_ABI_VERSION > 0x0203)
    WebPMemoryWriterClear(&mw);
#else
    free(mw.mem); /* must use free() according to libwebp documentation */
#endif
    WebPPictureFree(pic);
    av_freep(&pic);
    av_frame_free(&alt_frame);

    return ret;
}

static int libwebp_encode_close(AVCodecContext *avctx)
{
    LibWebPContext *s  = avctx->priv_data;

    av_frame_free(&s->ref);

    return 0;
}

#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" },
    { "cr_threshold","Conditional replenishment threshold",     OFFSET(cr_threshold), AV_OPT_TYPE_INT, { .i64 =  0  },  0, INT_MAX, VE           },
    { "cr_size"     ,"Conditional replenishment block size",    OFFSET(cr_size)     , AV_OPT_TYPE_INT, { .i64 =  16 },  0, 256,     VE           },
    { "quality"     ,"Quality",                OFFSET(quality),  AV_OPT_TYPE_FLOAT, { .dbl =  75 }, 0, 100,                         VE           },
    { 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,
    .close          = libwebp_encode_close,
    .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,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* WebP encoding support via libwebp
	3	* Copyright (c) 2013 Justin Ruggles <justin.ruggles@gmail.com>
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* WebP encoder using libwebp
	25	*/
	26
	27	#include <webp/encode.h>
	28
	29	#include "libavutil/common.h"
	30	#include "libavutil/frame.h"
	31	#include "libavutil/imgutils.h"
	32	#include "libavutil/opt.h"
	33	#include "avcodec.h"
	34	#include "internal.h"
	35
	36	typedef struct LibWebPContext {
	37	AVClass *class; // class for AVOptions
	38	float quality; // lossy quality 0 - 100
	39	int lossless; // use lossless encoding
	40	int preset; // configuration preset
	41	int chroma_warning; // chroma linesize mismatch warning has been printed
	42	int conversion_warning; // pixel format conversion warning has been printed
	43	WebPConfig config; // libwebp configuration
f6fa7814 DM	44	AVFrame *ref;
	45	int cr_size;
	46	int cr_threshold;
2ba45a60 DM	47	} LibWebPContext;
	48
	49	static int libwebp_error_to_averror(int err)
	50	{
	51	switch (err) {
	52	case VP8_ENC_ERROR_OUT_OF_MEMORY:
	53	case VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY:
	54	return AVERROR(ENOMEM);
	55	case VP8_ENC_ERROR_NULL_PARAMETER:
	56	case VP8_ENC_ERROR_INVALID_CONFIGURATION:
	57	case VP8_ENC_ERROR_BAD_DIMENSION:
	58	return AVERROR(EINVAL);
	59	}
	60	return AVERROR_UNKNOWN;
	61	}
	62
	63	static av_cold int libwebp_encode_init(AVCodecContext *avctx)
	64	{
	65	LibWebPContext *s = avctx->priv_data;
	66	int ret;
	67
f6fa7814 DM	68	if (avctx->global_quality >= 0)
	69	s->quality = av_clipf(avctx->global_quality / (float)FF_QP2LAMBDA,
	70	0.0f, 100.0f);
2ba45a60 DM	71
	72	if (avctx->compression_level < 0 \|\| avctx->compression_level > 6) {
	73	av_log(avctx, AV_LOG_WARNING, "invalid compression level: %d\n",
	74	avctx->compression_level);
	75	avctx->compression_level = av_clip(avctx->compression_level, 0, 6);
	76	}
	77
	78	if (s->preset >= WEBP_PRESET_DEFAULT) {
	79	ret = WebPConfigPreset(&s->config, s->preset, s->quality);
	80	if (!ret)
	81	return AVERROR_UNKNOWN;
	82	s->lossless = s->config.lossless;
	83	s->quality = s->config.quality;
	84	avctx->compression_level = s->config.method;
	85	} else {
	86	ret = WebPConfigInit(&s->config);
	87	if (!ret)
	88	return AVERROR_UNKNOWN;
	89
	90	s->config.lossless = s->lossless;
	91	s->config.quality = s->quality;
	92	s->config.method = avctx->compression_level;
	93
	94	ret = WebPValidateConfig(&s->config);
	95	if (!ret)
	96	return AVERROR(EINVAL);
	97	}
	98
	99	av_log(avctx, AV_LOG_DEBUG, "%s - quality=%.1f method=%d\n",
	100	s->lossless ? "Lossless" : "Lossy", s->quality,
	101	avctx->compression_level);
	102
	103	return 0;
	104	}
	105
	106	static int libwebp_encode_frame(AVCodecContext avctx, AVPacket pkt,
	107	const AVFrame frame, int got_packet)
	108	{
	109	LibWebPContext *s = avctx->priv_data;
	110	AVFrame *alt_frame = NULL;
	111	WebPPicture *pic = NULL;
	112	WebPMemoryWriter mw = { 0 };
	113	int ret;
	114
	115	if (avctx->width > WEBP_MAX_DIMENSION \|\| avctx->height > WEBP_MAX_DIMENSION) {
	116	av_log(avctx, AV_LOG_ERROR, "Picture size is too large. Max is %dx%d.\n",
	117	WEBP_MAX_DIMENSION, WEBP_MAX_DIMENSION);
	118	return AVERROR(EINVAL);
	119	}
	120
	121	pic = av_malloc(sizeof(*pic));
	122	if (!pic)
	123	return AVERROR(ENOMEM);
	124
	125	ret = WebPPictureInit(pic);
	126	if (!ret) {
	127	ret = AVERROR_UNKNOWN;
	128	goto end;
	129	}
	130	pic->width = avctx->width;
	131	pic->height = avctx->height;
	132
	133	if (avctx->pix_fmt == AV_PIX_FMT_RGB32) {
	134	if (!s->lossless) {
135	/* libwebp will automatically convert RGB input to YUV when
136	encoding lossy. */
137	if (!s->conversion_warning) {
138	av_log(avctx, AV_LOG_WARNING,
139	"Using libwebp for RGB-to-YUV conversion. You may want "
140	"to consider passing in YUV instead for lossy "
141	"encoding.\n");
142	s->conversion_warning = 1;
143	}
144	}
145	pic->use_argb = 1;
146	pic->argb = (uint32_t *)frame->data[0];
147	pic->argb_stride = frame->linesize[0] / 4;
148	} else {
f6fa7814 DM	149	if (frame->linesize[1] != frame->linesize[2] \|\| s->cr_threshold) {
f6fa7814 DM	150	if (!s->chroma_warning && !s->cr_threshold) {
2ba45a60 DM	151	av_log(avctx, AV_LOG_WARNING,
	152	"Copying frame due to differing chroma linesizes.\n");
	153	s->chroma_warning = 1;
	154	}
	155	alt_frame = av_frame_alloc();
	156	if (!alt_frame) {
	157	ret = AVERROR(ENOMEM);
	158	goto end;
	159	}
	160	alt_frame->width = frame->width;
	161	alt_frame->height = frame->height;
	162	alt_frame->format = frame->format;
f6fa7814 DM	163	if (s->cr_threshold)
f6fa7814 DM	164	alt_frame->format = AV_PIX_FMT_YUVA420P;
2ba45a60 DM	165	ret = av_frame_get_buffer(alt_frame, 32);
	166	if (ret < 0)
	167	goto end;
f6fa7814	168	alt_frame->format = frame->format;
2ba45a60 DM	169	av_frame_copy(alt_frame, frame);
2ba45a60 DM	170	frame = alt_frame;
f6fa7814 DM	171	if (s->cr_threshold) {
	172	int x,y, x2, y2, p;
	173	int bs = s->cr_size;
	174
	175	if (!s->ref) {
	176	s->ref = av_frame_clone(frame);
	177	if (!s->ref) {
	178	ret = AVERROR(ENOMEM);
	179	goto end;
	180	}
	181	}
	182
	183	alt_frame->format = AV_PIX_FMT_YUVA420P;
	184	for (y = 0; y < frame->height; y+= bs) {
	185	for (x = 0; x < frame->width; x+= bs) {
	186	int skip;
	187	int sse = 0;
	188	for (p = 0; p < 3; p++) {
	189	int bs2 = bs >> !!p;
	190	int w = FF_CEIL_RSHIFT(frame->width , !!p);
	191	int h = FF_CEIL_RSHIFT(frame->height, !!p);
	192	int xs = x >> !!p;
	193	int ys = y >> !!p;
	194	for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
	195	for (x2 = xs; x2 < FFMIN(xs + bs2, w); x2++) {
	196	int diff = frame->data[p][frame->linesize[p] * y2 + x2]
	197	-s->ref->data[p][frame->linesize[p] * y2 + x2];
	198	sse += diff*diff;
	199	}
	200	}
	201	}
	202	skip = sse < s->cr_threshold && frame->data[3] != s->ref->data[3];
	203	if (!skip)
	204	for (p = 0; p < 3; p++) {
	205	int bs2 = bs >> !!p;
	206	int w = FF_CEIL_RSHIFT(frame->width , !!p);
	207	int h = FF_CEIL_RSHIFT(frame->height, !!p);
	208	int xs = x >> !!p;
	209	int ys = y >> !!p;
	210	for (y2 = ys; y2 < FFMIN(ys + bs2, h); y2++) {
	211	memcpy(&s->ref->data[p][frame->linesize[p] * y2 + xs],
	212	& frame->data[p][frame->linesize[p] * y2 + xs], FFMIN(bs2, w-xs));
	213	}
	214	}
	215	for (y2 = y; y2 < FFMIN(y+bs, frame->height); y2++) {
	216	memset(&frame->data[3][frame->linesize[3] * y2 + x],
	217	skip ? 0 : 255,
	218	FFMIN(bs, frame->width-x));
	219	}
	220	}
	221	}
	222	}
2ba45a60	223	}
f6fa7814	224
2ba45a60 DM	225	pic->use_argb = 0;
	226	pic->y = frame->data[0];
	227	pic->u = frame->data[1];
	228	pic->v = frame->data[2];
	229	pic->y_stride = frame->linesize[0];
	230	pic->uv_stride = frame->linesize[1];
f6fa7814	231	if (frame->format == AV_PIX_FMT_YUVA420P) {
2ba45a60 DM	232	pic->colorspace = WEBP_YUV420A;
	233	pic->a = frame->data[3];
	234	pic->a_stride = frame->linesize[3];
f6fa7814 DM	235	if (alt_frame)
f6fa7814 DM	236	WebPCleanupTransparentArea(pic);
2ba45a60 DM	237	} else {
	238	pic->colorspace = WEBP_YUV420;
	239	}
	240
	241	if (s->lossless) {
	242	/* We do not have a way to automatically prioritize RGB over YUV
	243	in automatic pixel format conversion based on whether we're
	244	encoding lossless or lossy, so we do conversion with libwebp as
	245	a convenience. */
	246	if (!s->conversion_warning) {
	247	av_log(avctx, AV_LOG_WARNING,
	248	"Using libwebp for YUV-to-RGB conversion. You may want "
	249	"to consider passing in RGB instead for lossless "
	250	"encoding.\n");
	251	s->conversion_warning = 1;
	252	}
	253
	254	#if (WEBP_ENCODER_ABI_VERSION <= 0x201)
	255	/* libwebp should do the conversion automatically, but there is a
	256	bug that causes it to return an error instead, so a work-around
	257	is required.
	258	See https://code.google.com/p/webp/issues/detail?id=178 */
	259	pic->memory_ = (void)1; / something non-null */
	260	ret = WebPPictureYUVAToARGB(pic);
	261	if (!ret) {
	262	av_log(avctx, AV_LOG_ERROR,
	263	"WebPPictureYUVAToARGB() failed with error: %d\n",
	264	pic->error_code);
	265	ret = libwebp_error_to_averror(pic->error_code);
	266	goto end;
	267	}
	268	pic->memory_ = NULL; /* restore pointer */
	269	#endif
	270	}
	271	}
	272
	273	WebPMemoryWriterInit(&mw);
	274	pic->custom_ptr = &mw;
	275	pic->writer = WebPMemoryWrite;
	276
	277	ret = WebPEncode(&s->config, pic);
	278	if (!ret) {
	279	av_log(avctx, AV_LOG_ERROR, "WebPEncode() failed with error: %d\n",
	280	pic->error_code);
	281	ret = libwebp_error_to_averror(pic->error_code);
	282	goto end;
	283	}
	284
	285	ret = ff_alloc_packet(pkt, mw.size);
	286	if (ret < 0)
	287	goto end;
	288	memcpy(pkt->data, mw.mem, mw.size);
	289
	290	pkt->flags \|= AV_PKT_FLAG_KEY;
	291	*got_packet = 1;
	292
	293	end:
	294	#if (WEBP_ENCODER_ABI_VERSION > 0x0203)
	295	WebPMemoryWriterClear(&mw);
	296	#else
	297	free(mw.mem); /* must use free() according to libwebp documentation */
	298	#endif
	299	WebPPictureFree(pic);
	300	av_freep(&pic);
301	av_frame_free(&alt_frame);
302
303	return ret;
304	}
305
f6fa7814 DM	306	static int libwebp_encode_close(AVCodecContext *avctx)
	307	{
	308	LibWebPContext *s = avctx->priv_data;
	309
	310	av_frame_free(&s->ref);
	311
	312	return 0;
	313	}
	314
2ba45a60 DM	315	#define OFFSET(x) offsetof(LibWebPContext, x)
	316	#define VE AV_OPT_FLAG_VIDEO_PARAM \| AV_OPT_FLAG_ENCODING_PARAM
	317	static const AVOption options[] = {
	318	{ "lossless", "Use lossless mode", OFFSET(lossless), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
	319	{ "preset", "Configuration preset", OFFSET(preset), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, WEBP_PRESET_TEXT, VE, "preset" },
	320	{ "none", "do not use a preset", 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, VE, "preset" },
	321	{ "default", "default preset", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DEFAULT }, 0, 0, VE, "preset" },
	322	{ "picture", "digital picture, like portrait, inner shot", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PICTURE }, 0, 0, VE, "preset" },
	323	{ "photo", "outdoor photograph, with natural lighting", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_PHOTO }, 0, 0, VE, "preset" },
	324	{ "drawing", "hand or line drawing, with high-contrast details", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_DRAWING }, 0, 0, VE, "preset" },
	325	{ "icon", "small-sized colorful images", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_ICON }, 0, 0, VE, "preset" },
	326	{ "text", "text-like", 0, AV_OPT_TYPE_CONST, { .i64 = WEBP_PRESET_TEXT }, 0, 0, VE, "preset" },
f6fa7814 DM	327	{ "cr_threshold","Conditional replenishment threshold", OFFSET(cr_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
	328	{ "cr_size" ,"Conditional replenishment block size", OFFSET(cr_size) , AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 256, VE },
	329	{ "quality" ,"Quality", OFFSET(quality), AV_OPT_TYPE_FLOAT, { .dbl = 75 }, 0, 100, VE },
2ba45a60 DM	330	{ NULL },
	331	};
	332
f6fa7814	333
2ba45a60 DM	334	static const AVClass class = {
	335	.class_name = "libwebp",
	336	.item_name = av_default_item_name,
	337	.option = options,
	338	.version = LIBAVUTIL_VERSION_INT,
	339	};
	340
	341	static const AVCodecDefault libwebp_defaults[] = {
	342	{ "compression_level", "4" },
	343	{ "global_quality", "-1" },
	344	{ NULL },
	345	};
	346
	347	AVCodec ff_libwebp_encoder = {
	348	.name = "libwebp",
	349	.long_name = NULL_IF_CONFIG_SMALL("libwebp WebP image"),
	350	.type = AVMEDIA_TYPE_VIDEO,
	351	.id = AV_CODEC_ID_WEBP,
	352	.priv_data_size = sizeof(LibWebPContext),
	353	.init = libwebp_encode_init,
	354	.encode2 = libwebp_encode_frame,
f6fa7814	355	.close = libwebp_encode_close,
2ba45a60 DM	356	.pix_fmts = (const enum AVPixelFormat[]) {
	357	AV_PIX_FMT_RGB32,
	358	AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P,
	359	AV_PIX_FMT_NONE
	360	},
	361	.priv_class = &class,
	362	.defaults = libwebp_defaults,
	363	};