From 8299a7f81974db82ed7bbe3469c25f386ff4effd Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Tue, 25 May 2010 01:19:08 +0000
Subject: VP8 decoding via libvpx.

Patch by James Zern for Google, Inc., jzern google com

Originally committed as revision 23303 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/libvpxdec.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 libavcodec/libvpxdec.c

(limited to 'libavcodec/libvpxdec.c')

diff --git a/libavcodec/libvpxdec.c b/libavcodec/libvpxdec.c
new file mode 100644
index 0000000000..6c03ec4cb0
--- /dev/null
+++ b/libavcodec/libvpxdec.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2010, Google, Inc.
+ *
+ * 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
+ * VP8 decoder support via libvpx
+ */
+
+#define VPX_CODEC_DISABLE_COMPAT 1
+#include <vpx_decoder.h>
+#include <vp8dx.h>
+
+#include "avcodec.h"
+
+typedef struct VP8DecoderContext {
+    struct vpx_codec_ctx decoder;
+} VP8Context;
+
+static av_cold int vp8_init(AVCodecContext *avctx)
+{
+    VP8Context *ctx = avctx->priv_data;
+    const struct vpx_codec_iface *iface = &vpx_codec_vp8_dx_algo;
+    struct vpx_codec_dec_cfg deccfg = {
+        /* token partitions+1 would be a decent choice */
+        .threads = FFMIN(avctx->thread_count, 16)
+    };
+
+    av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
+    av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());
+
+    if (vpx_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != VPX_CODEC_OK) {
+        const char *error = vpx_codec_error(&ctx->decoder);
+        av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
+               error);
+        return AVERROR(EINVAL);
+    }
+
+    avctx->pix_fmt = PIX_FMT_YUV420P;
+    return 0;
+}
+
+static int vp8_decode(AVCodecContext *avctx,
+                      void *data, int *data_size, AVPacket *avpkt)
+{
+    VP8Context *ctx = avctx->priv_data;
+    AVFrame *picture = data;
+    const void *iter = NULL;
+    struct vpx_image *img;
+
+    if (vpx_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL, 0) !=
+        VPX_CODEC_OK) {
+        const char *error  = vpx_codec_error(&ctx->decoder);
+        const char *detail = vpx_codec_error_detail(&ctx->decoder);
+
+        av_log(avctx, AV_LOG_ERROR, "Failed to decode frame: %s\n", error);
+        if (detail)
+            av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n",
+                   detail);
+        return AVERROR_INVALIDDATA;
+    }
+
+    if ((img = vpx_codec_get_frame(&ctx->decoder, &iter))) {
+        if (img->fmt != VPX_IMG_FMT_I420) {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d)\n",
+                   img->fmt);
+            return AVERROR_INVALIDDATA;
+        }
+
+        if ((int) img->d_w != avctx->width || (int) img->d_h != avctx->height) {
+            av_log(avctx, AV_LOG_INFO, "dimension change! %dx%d -> %dx%d\n",
+                   avctx->width, avctx->height, img->d_w, img->d_h);
+            if (avcodec_check_dimensions(avctx, img->d_w, img->d_h))
+                return AVERROR_INVALIDDATA;
+            avcodec_set_dimensions(avctx, img->d_w, img->d_h);
+        }
+        picture->data[0]     = img->planes[0];
+        picture->data[1]     = img->planes[1];
+        picture->data[2]     = img->planes[2];
+        picture->data[3]     = NULL;
+        picture->linesize[0] = img->stride[0];
+        picture->linesize[1] = img->stride[1];
+        picture->linesize[2] = img->stride[2];
+        picture->linesize[3] = 0;
+        *data_size           = sizeof(AVPicture);
+    }
+    return avpkt->size;
+}
+
+static av_cold int vp8_free(AVCodecContext *avctx)
+{
+    VP8Context *ctx = avctx->priv_data;
+    vpx_codec_destroy(&ctx->decoder);
+    return 0;
+}
+
+AVCodec libvpx_decoder = {
+    "libvpx",
+    AVMEDIA_TYPE_VIDEO,
+    CODEC_ID_VP8,
+    sizeof(VP8Context),
+    vp8_init,
+    NULL, /* encode */
+    vp8_free,
+    vp8_decode,
+    0, /* capabilities */
+    .long_name = NULL_IF_CONFIG_SMALL("libvpx VP8"),
+};
-- 
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