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Diffstat (limited to 'libavcodec/libwebpenc_common.c')
-rw-r--r--libavcodec/libwebpenc_common.c254
1 files changed, 254 insertions, 0 deletions
diff --git a/libavcodec/libwebpenc_common.c b/libavcodec/libwebpenc_common.c
new file mode 100644
index 0000000000..a76b6da5d6
--- /dev/null
+++ b/libavcodec/libwebpenc_common.c
@@ -0,0 +1,254 @@
+/*
+ * 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: common structs and methods.
+ */
+
+#include "libwebpenc_common.h"
+
+int ff_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;
+}
+
+av_cold int ff_libwebp_encode_init_common(AVCodecContext *avctx)
+{
+ LibWebPContextCommon *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;
+}
+
+int ff_libwebp_get_frame(AVCodecContext *avctx, LibWebPContextCommon *s,
+ const AVFrame *frame, AVFrame **alt_frame_ptr,
+ WebPPicture **pic_ptr) {
+ int ret;
+ WebPPicture *pic = NULL;
+ AVFrame *alt_frame = NULL;
+
+ 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_ptr = av_malloc(sizeof(*pic));
+ pic = *pic_ptr;
+ 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_ptr = av_frame_alloc();
+ alt_frame = *alt_frame_ptr;
+ 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
+ }
+ }
+end:
+ return ret;
+}
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