From b667252a41fbf5a3f6ea8c67fdbc03db3d748977 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Mon, 21 Mar 2016 09:00:40 +0100
Subject: [PATCH] h2645_parse: add support for parsing h264

---
 libavcodec/h2645_parse.c | 24 ++++++++++++++++++++++--
 libavcodec/h2645_parse.h | 15 ++++++++++++++-
 libavcodec/hevc.c        |  2 +-
 libavcodec/hevc_parser.c |  3 ++-
 4 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/libavcodec/h2645_parse.c b/libavcodec/h2645_parse.c
index 57a78e9c2c..310b0093ca 100644
--- a/libavcodec/h2645_parse.c
+++ b/libavcodec/h2645_parse.c
@@ -154,9 +154,26 @@ static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
     return nuh_layer_id == 0;
 }
 
+static int h264_parse_nal_header(H2645NAL *nal, void *logctx)
+{
+    GetBitContext *gb = &nal->gb;
+
+    if (get_bits1(gb) != 0)
+        return AVERROR_INVALIDDATA;
+
+    nal->ref_idc = get_bits(gb, 2);
+    nal->type    = get_bits(gb, 5);
+
+    av_log(logctx, AV_LOG_DEBUG,
+           "nal_unit_type: %d, nal_ref_idc: %d\n",
+           nal->type, nal->ref_idc);
+
+    return 1;
+}
 
 int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
-                          void *logctx, int is_nalff, int nal_length_size)
+                          void *logctx, int is_nalff, int nal_length_size,
+                          enum AVCodecID codec_id)
 {
     int consumed, ret = 0;
 
@@ -211,7 +228,10 @@ int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
         if (ret < 0)
             return ret;
 
-        ret = hevc_parse_nal_header(nal, logctx);
+        if (codec_id == AV_CODEC_ID_HEVC)
+            ret = hevc_parse_nal_header(nal, logctx);
+        else
+            ret = h264_parse_nal_header(nal, logctx);
         if (ret <= 0) {
             if (ret < 0) {
                 av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit %d, skipping.\n",
diff --git a/libavcodec/h2645_parse.h b/libavcodec/h2645_parse.h
index db9800736f..148ccf30ac 100644
--- a/libavcodec/h2645_parse.h
+++ b/libavcodec/h2645_parse.h
@@ -38,8 +38,20 @@ typedef struct H2645NAL {
 
     GetBitContext gb;
 
+    /**
+     * NAL unit type
+     */
     int type;
+
+    /**
+     * HEVC only, nuh_temporal_id_plus_1 - 1
+     */
     int temporal_id;
+
+    /**
+     * H264 only, nal_ref_idc
+     */
+    int ref_idc;
 } H2645NAL;
 
 /* an input packet split into unescaped NAL units */
@@ -59,7 +71,8 @@ int ff_h2645_extract_rbsp(const uint8_t *src, int length,
  * Split an input packet into NAL units.
  */
 int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
-                          void *logctx, int is_nalff, int nal_length_size);
+                          void *logctx, int is_nalff, int nal_length_size,
+                          enum AVCodecID codec_id);
 
 /**
  * Free all the allocated memory in the packet.
diff --git a/libavcodec/hevc.c b/libavcodec/hevc.c
index 72dea5a589..3bc730a68e 100644
--- a/libavcodec/hevc.c
+++ b/libavcodec/hevc.c
@@ -2582,7 +2582,7 @@ static int decode_nal_units(HEVCContext *s, const uint8_t *buf, int length)
     /* split the input packet into NAL units, so we know the upper bound on the
      * number of slices in the frame */
     ret = ff_h2645_packet_split(&s->pkt, buf, length, s->avctx, s->is_nalff,
-                                s->nal_length_size);
+                                s->nal_length_size, s->avctx->codec_id);
     if (ret < 0) {
         av_log(s->avctx, AV_LOG_ERROR,
                "Error splitting the input into NAL units.\n");
diff --git a/libavcodec/hevc_parser.c b/libavcodec/hevc_parser.c
index 5c1fbc31d5..dc5fffcb0b 100644
--- a/libavcodec/hevc_parser.c
+++ b/libavcodec/hevc_parser.c
@@ -82,7 +82,8 @@ static int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
     HEVCParserContext *ctx = s->priv_data;
     int ret, i;
 
-    ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, 0, 0);
+    ret = ff_h2645_packet_split(&ctx->pkt, buf, buf_size, avctx, 0, 0,
+                                AV_CODEC_ID_HEVC);
     if (ret < 0)
         return ret;