From b6c61fb83e876d404ac3b0b3657ebfcafdcd1926 Mon Sep 17 00:00:00 2001
From: Tim Walker <tdskywalker@gmail.com>
Date: Mon, 3 Mar 2014 14:53:42 +0000
Subject: movenc: enable Annex B to MP4 conversion for HEVC tracks.

---
 libavformat/hevc.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)

(limited to 'libavformat/hevc.c')

diff --git a/libavformat/hevc.c b/libavformat/hevc.c
index ab4eb10a8b..2c1b4c492d 100644
--- a/libavformat/hevc.c
+++ b/libavformat/hevc.c
@@ -1014,6 +1014,107 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
     return 0;
 }
 
+int ff_hevc_annexb2mp4(AVIOContext *pb, const uint8_t *buf_in,
+                       int size, int filter_ps, int *ps_count)
+{
+    int num_ps = 0, ret = 0;
+    uint8_t *buf, *end, *start = NULL;
+
+    if (!filter_ps) {
+        ret = ff_avc_parse_nal_units(pb, buf_in, size);
+        goto end;
+    }
+
+    ret = ff_avc_parse_nal_units_buf(buf_in, &start, &size);
+    if (ret < 0)
+        goto end;
+
+    ret = 0;
+    buf = start;
+    end = start + size;
+
+    while (end - buf > 4) {
+        uint32_t len = FFMIN(AV_RB32(buf), end - buf - 4);
+        uint8_t type = (buf[4] >> 1) & 0x3f;
+
+        buf += 4;
+
+        switch (type) {
+        case NAL_VPS:
+        case NAL_SPS:
+        case NAL_PPS:
+            num_ps++;
+            break;
+        default:
+            ret += 4 + len;
+            avio_wb32(pb, len);
+            avio_write(pb, buf, len);
+            break;
+        }
+
+        buf += len;
+    }
+
+end:
+    free(start);
+    if (ps_count)
+        *ps_count = num_ps;
+    return ret;
+}
+
+int ff_hevc_annexb2mp4_buf(const uint8_t *buf_in, uint8_t **buf_out,
+                           int *size, int filter_ps, int *ps_count)
+{
+    AVIOContext *pb;
+    int num_ps = 0, ret = 0;
+    uint8_t *buf, *end, *start = NULL;
+
+    if (!filter_ps) {
+        ret = ff_avc_parse_nal_units_buf(buf_in, buf_out, size);
+        goto end;
+    }
+
+    ret = avio_open_dyn_buf(&pb);
+    if (ret < 0)
+        goto end;
+
+    ret = ff_avc_parse_nal_units_buf(buf_in, &start, size);
+    if (ret < 0)
+        goto end;
+
+    buf = start;
+    end = start + *size;
+
+    while (end - buf > 4) {
+        uint32_t len = FFMIN(AV_RB32(buf), end - buf - 4);
+        uint8_t type = (buf[4] >> 1) & 0x3f;
+
+        buf += 4;
+
+        switch (type) {
+        case NAL_VPS:
+        case NAL_SPS:
+        case NAL_PPS:
+            num_ps++;
+            break;
+        default:
+            avio_wb32(pb, len);
+            avio_write(pb, buf, len);
+            break;
+        }
+
+        buf += len;
+    }
+
+    *size = avio_close_dyn_buf(pb, buf_out);
+
+end:
+    free(start);
+    if (ps_count)
+        *ps_count = num_ps;
+    return ret;
+}
+
 int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
                        int size, int ps_array_completeness)
 {
-- 
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