lavc: add a HEVC decoder.

Initially written by Guillaume Martres <smarter@ubuntu.com> as a GSoC
project. Further contributions by the OpenHEVC project and other
developers, namely:

Mickaël Raulet <mraulet@insa-rennes.fr>
Seppo Tomperi <seppo.tomperi@vtt.fi>
Gildas Cocherel <gildas.cocherel@laposte.net>
Khaled Jerbi <khaled_jerbi@yahoo.fr>
Wassim Hamidouche <wassim.hamidouche@insa-rennes.fr>
Vittorio Giovara <vittorio.giovara@gmail.com>
Jan Ekström <jeebjp@gmail.com>
Anton Khirnov <anton@khirnov.net>
Martin Storsjö <martin@martin.st>
Luca Barbato <lu_zero@gentoo.org>
Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 129 insertions, 0 deletions

diff --git a/libavcodec/hevc_sei.c b/libavcodec/hevc_sei.c
new file mode 100644
index 0000000000..abdbc001e1
--- /dev/null
+++ b/libavcodec/hevc_sei.c
@@ -0,0 +1,129 @@
+/*
+ * HEVC Supplementary Enhancement Information messages
+ *
+ * Copyright (C) 2012 - 2013 Guillaume Martres
+ * Copyright (C) 2012 - 2013 Gildas Cocherel
+ * Copyright (C) 2013 Vittorio Giovara
+ *
+ * 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
+ */
+
+#include "hevc.h"
+#include "golomb.h"
+
+static void decode_nal_sei_decoded_picture_hash(HEVCContext *s, int payload_size)
+{
+    int cIdx, i;
+    uint8_t hash_type;
+    //uint16_t picture_crc;
+    //uint32_t picture_checksum;
+    GetBitContext *gb = &s->HEVClc.gb;
+    hash_type = get_bits(gb, 8);
+
+
+    for( cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++ ) {
+        if ( hash_type == 0 ) {
+            s->is_md5 = 1;
+            for( i = 0; i < 16; i++) {
+                s->md5[cIdx][i] = get_bits(gb, 8);
+            }
+        } else if( hash_type == 1 ) {
+            // picture_crc = get_bits(gb, 16);
+            skip_bits(gb, 16);
+        } else if( hash_type == 2 ) {
+            // picture_checksum = get_bits(gb, 32);
+            skip_bits(gb, 32);
+        }
+    }
+}
+
+static void decode_nal_sei_frame_packing_arrangement(HEVCLocalContext *lc)
+{
+    GetBitContext *gb = &lc->gb;
+    int cancel, type, quincunx;
+
+    get_ue_golomb(gb);                      // frame_packing_arrangement_id
+    cancel = get_bits1(gb);                 // frame_packing_cancel_flag
+    if ( cancel == 0 )
+    {
+        type = get_bits(gb, 7);             // frame_packing_arrangement_type
+        quincunx = get_bits1(gb);           // quincunx_sampling_flag
+        skip_bits(gb, 6);                   // content_interpretation_type
+
+        // the following skips spatial_flipping_flag frame0_flipped_flag
+        // field_views_flag current_frame_is_frame0_flag
+        // frame0_self_contained_flag frame1_self_contained_flag
+        skip_bits(gb, 6);
+
+        if ( quincunx == 0 && type != 5 )
+            skip_bits(gb, 16);              // frame[01]_grid_position_[xy]
+        skip_bits(gb, 8);                   // frame_packing_arrangement_reserved_byte
+        skip_bits1(gb);                     // frame_packing_arrangement_persistance_flag
+    }
+    skip_bits1(gb);                         // upsampled_aspect_ratio_flag
+}
+
+static int decode_nal_sei_message(HEVCContext *s)
+{
+    GetBitContext *gb = &s->HEVClc.gb;
+
+    int payload_type = 0;
+    int payload_size = 0;
+    int byte = 0xFF;
+    av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
+
+    while (byte == 0xFF) {
+        byte = get_bits(gb, 8);
+        payload_type += byte;
+    }
+    byte = 0xFF;
+    while (byte == 0xFF) {
+        byte = get_bits(gb, 8);
+        payload_size += byte;
+    }
+    if (s->nal_unit_type == NAL_SEI_PREFIX) {
+        if (payload_type == 256 /*&& s->decode_checksum_sei*/)
+            decode_nal_sei_decoded_picture_hash(s, payload_size);
+        else if (payload_type == 45)
+            decode_nal_sei_frame_packing_arrangement(&s->HEVClc);
+        else {
+            av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
+            skip_bits(gb, 8*payload_size);
+        }
+    } else { /* nal_unit_type == NAL_SEI_SUFFIX */
+        if (payload_type == 132 /* && s->decode_checksum_sei */)
+            decode_nal_sei_decoded_picture_hash(s, payload_size);
+        else {
+            av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
+            skip_bits(gb, 8*payload_size);
+        }
+    }
+    return 0;
+}
+
+static int more_rbsp_data(GetBitContext *gb)
+{
+    return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
+}
+
+int ff_hevc_decode_nal_sei(HEVCContext *s)
+{
+    do {
+        decode_nal_sei_message(s);
+    } while (more_rbsp_data(&s->HEVClc.gb));
+    return 0;
+}