Merge commit 'c438899a706422b8362a13714580e988be4d638b'

* commit 'c438899a706422b8362a13714580e988be4d638b':
  Add AV1 video decoding support through libaom

This contains some extra changes taken from the libvpx decoder
wrapper, most of them contained in the set_pix_fmt() function.

Merged-by: James Almer <jamrial@gmail.com>

6 files changed, 266 insertions, 0 deletions

diff --git a/Changelog b/Changelog
index 30a8978db4..08a1e7f9a4 100644
--- a/Changelog
+++ b/Changelog
@@ -48,6 +48,7 @@ version <next>:
 - drmeter audio filter
 - hapqa_extract bitstream filter
 - filter_units bitstream filter
+- AV1 Support through libaom
 
 
 version 3.4:
diff --git a/configure b/configure
index d12c8ba77c..f8820aec09 100755
--- a/configure
+++ b/configure
@@ -217,6 +217,7 @@ External library support:
   --disable-iconv          disable iconv [autodetect]
   --enable-jni             enable JNI support [no]
   --enable-ladspa          enable LADSPA audio filtering [no]
+  --enable-libaom          enable AV1 video encoding/decoding via libaom [no]
   --enable-libass          enable libass subtitles rendering,
                            needed for subtitles and ass filter [no]
   --enable-libbluray       enable BluRay reading using libbluray [no]
@@ -1653,6 +1654,7 @@ EXTERNAL_LIBRARY_LIST="
     gnutls
     jni
     ladspa
+    libaom
     libass
     libbluray
     libbs2b
@@ -3004,6 +3006,7 @@ h264_videotoolbox_encoder_deps="pthreads"
 h264_videotoolbox_encoder_select="videotoolbox_encoder"
 hevc_videotoolbox_encoder_deps="pthreads"
 hevc_videotoolbox_encoder_select="videotoolbox_encoder"
+libaom_av1_decoder_deps="libaom"
 libcelt_decoder_deps="libcelt"
 libcodec2_decoder_deps="libcodec2"
 libcodec2_encoder_deps="libcodec2"
@@ -5930,6 +5933,7 @@ enabled gmp               && require gmp gmp.h mpz_export -lgmp
 enabled gnutls            && require_pkg_config gnutls gnutls gnutls/gnutls.h gnutls_global_init
 enabled jni               && { [ $target_os = "android" ] && check_header jni.h && enabled pthreads || die "ERROR: jni not found"; }
 enabled ladspa            && require_header ladspa.h
+enabled libaom            && require_pkg_config libaom "aom >= 0.1.0" aom/aom_codec.h aom_codec_version
 enabled lv2               && require_pkg_config lv2 lilv-0 "lilv-0/lilv/lilv.h" lilv_world_new
 enabled libiec61883       && require libiec61883 libiec61883/iec61883.h iec61883_cmp_connect -lraw1394 -lavc1394 -lrom1394 -liec61883
 enabled libass            && require_pkg_config libass libass ass/ass.h ass_library_init
diff --git a/doc/general.texi b/doc/general.texi
index c5d46d3404..00d5d684ce 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -17,6 +17,14 @@ for more formats. None of them are used by default, their use has to be
 explicitly requested by passing the appropriate flags to
 @command{./configure}.
 
++@section Alliance for Open Media libaom
+
+FFmpeg can make use of the libaom library for AV1 decoding.
+
+Go to @url{http://aomedia.org/} and follow the instructions for
+installing the library. Then pass @code{--enable-libaom} to configure to
+enable it.
+
 @section OpenJPEG
 
 FFmpeg can use the OpenJPEG libraries for encoding/decoding J2K videos.  Go to
@@ -719,6 +727,8 @@ following image formats are supported:
 @item Autodesk Animator Flic video  @tab     @tab  X
 @item Autodesk RLE           @tab     @tab  X
     @tab fourcc: AASC
+@item AV1                    @tab     @tab  E
+    @tab Supported through external library libaom
 @item Avid 1:1 10-bit RGB Packer  @tab  X  @tab  X
     @tab fourcc: AVrp
 @item AVS (Audio Video Standard) video  @tab     @tab  X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index aaef6c3ab8..127f53596a 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -939,6 +939,7 @@ OBJS-$(CONFIG_ALAC_AT_ENCODER)            += audiotoolboxenc.o
 OBJS-$(CONFIG_ILBC_AT_ENCODER)            += audiotoolboxenc.o
 OBJS-$(CONFIG_PCM_ALAW_AT_ENCODER)        += audiotoolboxenc.o
 OBJS-$(CONFIG_PCM_MULAW_AT_ENCODER)       += audiotoolboxenc.o
+OBJS-$(CONFIG_LIBAOM_AV1_DECODER)         += libaomdec.o
 OBJS-$(CONFIG_LIBCELT_DECODER)            += libcelt_dec.o
 OBJS-$(CONFIG_LIBCODEC2_DECODER)          += libcodec2.o codec2utils.o
 OBJS-$(CONFIG_LIBCODEC2_ENCODER)          += libcodec2.o codec2utils.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 71719595c6..be7f24725b 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -663,6 +663,7 @@ extern AVCodec ff_pcm_mulaw_at_encoder;
 extern AVCodec ff_pcm_mulaw_at_decoder;
 extern AVCodec ff_qdmc_at_decoder;
 extern AVCodec ff_qdm2_at_decoder;
+extern AVCodec ff_libaom_av1_decoder;
 extern AVCodec ff_libcelt_decoder;
 extern AVCodec ff_libcodec2_encoder;
 extern AVCodec ff_libcodec2_decoder;
diff --git a/libavcodec/libaomdec.c b/libavcodec/libaomdec.c
new file mode 100644
index 0000000000..5158ea8d76
--- /dev/null
+++ b/libavcodec/libaomdec.c
@@ -0,0 +1,249 @@
+/*
+ * 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
+ * AV1 decoder support via libaom
+ */
+
+#include <aom/aom_decoder.h>
+#include <aom/aomdx.h>
+
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+
+#include "avcodec.h"
+#include "internal.h"
+
+typedef struct AV1DecodeContext {
+    struct aom_codec_ctx decoder;
+} AV1DecodeContext;
+
+static av_cold int aom_init(AVCodecContext *avctx,
+                            const struct aom_codec_iface *iface)
+{
+    AV1DecodeContext *ctx           = avctx->priv_data;
+    struct aom_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", aom_codec_version_str());
+    av_log(avctx, AV_LOG_VERBOSE, "%s\n", aom_codec_build_config());
+
+    if (aom_codec_dec_init(&ctx->decoder, iface, &deccfg, 0) != AOM_CODEC_OK) {
+        const char *error = aom_codec_error(&ctx->decoder);
+        av_log(avctx, AV_LOG_ERROR, "Failed to initialize decoder: %s\n",
+               error);
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+static void image_copy_16_to_8(AVFrame *pic, struct aom_image *img)
+{
+    int i;
+
+    for (i = 0; i < 3; i++) {
+        int w = img->d_w;
+        int h = img->d_h;
+        int x, y;
+
+        if (i) {
+            w = (w + img->x_chroma_shift) >> img->x_chroma_shift;
+            h = (h + img->y_chroma_shift) >> img->y_chroma_shift;
+        }
+
+        for (y = 0; y < h; y++) {
+            uint16_t *src = (uint16_t *)(img->planes[i] + y * img->stride[i]);
+            uint8_t *dst = pic->data[i] + y * pic->linesize[i];
+            for (x = 0; x < w; x++)
+                *dst++ = *src++;
+        }
+    }
+}
+
+// returns 0 on success, AVERROR_INVALIDDATA otherwise
+static int set_pix_fmt(AVCodecContext *avctx, struct aom_image *img)
+{
+    static const enum AVColorSpace colorspaces[10] = {
+        AVCOL_SPC_UNSPECIFIED, AVCOL_SPC_BT470BG, AVCOL_SPC_BT709, AVCOL_SPC_SMPTE170M,
+        AVCOL_SPC_SMPTE240M, AVCOL_SPC_BT2020_NCL, AVCOL_SPC_BT2020_CL, AVCOL_SPC_RGB,
+        AVCOL_SPC_ICTCP, AVCOL_SPC_RESERVED
+    };
+    static const enum AVColorRange color_ranges[] = {
+        AVCOL_RANGE_MPEG, AVCOL_RANGE_JPEG
+    };
+    avctx->color_range = color_ranges[img->range];
+    avctx->colorspace = colorspaces[img->cs];
+
+    switch (img->fmt) {
+    case AOM_IMG_FMT_I420:
+        avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+        return 0;
+    case AOM_IMG_FMT_I422:
+        avctx->pix_fmt = AV_PIX_FMT_YUV422P;
+        return 0;
+    case AOM_IMG_FMT_I440:
+        avctx->pix_fmt = AV_PIX_FMT_YUV440P;
+        return 0;
+    case AOM_IMG_FMT_I444:
+        avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
+                         AV_PIX_FMT_GBRP : AV_PIX_FMT_YUV444P;
+        return 0;
+    case AOM_IMG_FMT_I42016:
+        if (img->bit_depth == 8) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+            return 0;
+        } else if (img->bit_depth == 10) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
+            return 0;
+        } else if (img->bit_depth == 12) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV420P12;
+            return 0;
+        } else {
+            return AVERROR_INVALIDDATA;
+        }
+    case AOM_IMG_FMT_I42216:
+        if (img->bit_depth == 8) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV422P;
+            return 0;
+        } else if (img->bit_depth == 10) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
+            return 0;
+        } else if (img->bit_depth == 12) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV422P12;
+            return 0;
+        } else {
+            return AVERROR_INVALIDDATA;
+        }
+    case AOM_IMG_FMT_I44016:
+        if (img->bit_depth == 8) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV440P;
+            return 0;
+        } else if (img->bit_depth == 10) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV440P10;
+            return 0;
+        } else if (img->bit_depth == 12) {
+            avctx->pix_fmt = AV_PIX_FMT_YUV440P12;
+            return 0;
+        } else {
+            return AVERROR_INVALIDDATA;
+        }
+    case AOM_IMG_FMT_I44416:
+        if (img->bit_depth == 8) {
+            avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
+                             AV_PIX_FMT_GBRP : AV_PIX_FMT_YUV444P;
+            return 0;
+        } else if (img->bit_depth == 10) {
+            avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
+                             AV_PIX_FMT_GBRP10 : AV_PIX_FMT_YUV444P10;
+            return 0;
+        } else if (img->bit_depth == 12) {
+            avctx->pix_fmt = avctx->colorspace == AVCOL_SPC_RGB ?
+                             AV_PIX_FMT_GBRP12 : AV_PIX_FMT_YUV444P12;
+            return 0;
+        } else {
+            return AVERROR_INVALIDDATA;
+        }
+
+    default:
+        return AVERROR_INVALIDDATA;
+    }
+}
+
+static int aom_decode(AVCodecContext *avctx, void *data, int *got_frame,
+                      AVPacket *avpkt)
+{
+    AV1DecodeContext *ctx = avctx->priv_data;
+    AVFrame *picture      = data;
+    const void *iter      = NULL;
+    struct aom_image *img;
+    int ret;
+
+    if (aom_codec_decode(&ctx->decoder, avpkt->data, avpkt->size, NULL) !=
+        AOM_CODEC_OK) {
+        const char *error  = aom_codec_error(&ctx->decoder);
+        const char *detail = aom_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 = aom_codec_get_frame(&ctx->decoder, &iter))) {
+        if (img->d_w > img->w || img->d_h > img->h) {
+            av_log(avctx, AV_LOG_ERROR, "Display dimensions %dx%d exceed storage %dx%d\n",
+                   img->d_w, img->d_h, img->w, img->h);
+            return AVERROR_EXTERNAL;
+        }
+
+        if ((ret = set_pix_fmt(avctx, img)) < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Unsupported output colorspace (%d) / bit_depth (%d)\n",
+                   img->fmt, img->bit_depth);
+            return ret;
+        }
+
+        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);
+            ret = ff_set_dimensions(avctx, img->d_w, img->d_h);
+            if (ret < 0)
+                return ret;
+        }
+        if ((ret = ff_get_buffer(avctx, picture, 0)) < 0)
+            return ret;
+        if ((img->fmt & AOM_IMG_FMT_HIGHBITDEPTH) && img->bit_depth == 8)
+            image_copy_16_to_8(picture, img);
+        else
+            av_image_copy(picture->data, picture->linesize, (const uint8_t **)img->planes,
+                          img->stride, avctx->pix_fmt, img->d_w, img->d_h);
+        *got_frame = 1;
+    }
+    return avpkt->size;
+}
+
+static av_cold int aom_free(AVCodecContext *avctx)
+{
+    AV1DecodeContext *ctx = avctx->priv_data;
+    aom_codec_destroy(&ctx->decoder);
+    return 0;
+}
+
+static av_cold int av1_init(AVCodecContext *avctx)
+{
+    return aom_init(avctx, &aom_codec_av1_dx_algo);
+}
+
+AVCodec ff_libaom_av1_decoder = {
+    .name           = "libaom-av1",
+    .long_name      = NULL_IF_CONFIG_SMALL("libaom AV1"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_AV1,
+    .priv_data_size = sizeof(AV1DecodeContext),
+    .init           = av1_init,
+    .close          = aom_free,
+    .decode         = aom_decode,
+    .capabilities   = AV_CODEC_CAP_AUTO_THREADS | AV_CODEC_CAP_DR1,
+    .wrapper_name   = "libaom",
+};