From 150c9823e71a161e97003849cf8b2f55b21520bd Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Mon, 26 Aug 2013 15:10:18 +0100
Subject: adding ffmpeg specific version

---
 ffmpeg1/libavformat/avc.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 ffmpeg1/libavformat/avc.c

(limited to 'ffmpeg1/libavformat/avc.c')

diff --git a/ffmpeg1/libavformat/avc.c b/ffmpeg1/libavformat/avc.c
new file mode 100644
index 0000000..f5c513b
--- /dev/null
+++ b/ffmpeg1/libavformat/avc.c
@@ -0,0 +1,193 @@
+/*
+ * AVC helper functions for muxers
+ * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+#include "avio.h"
+#include "avc.h"
+
+static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
+{
+    const uint8_t *a = p + 4 - ((intptr_t)p & 3);
+
+    for (end -= 3; p < a && p < end; p++) {
+        if (p[0] == 0 && p[1] == 0 && p[2] == 1)
+            return p;
+    }
+
+    for (end -= 3; p < end; p += 4) {
+        uint32_t x = *(const uint32_t*)p;
+//      if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
+//      if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
+        if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
+            if (p[1] == 0) {
+                if (p[0] == 0 && p[2] == 1)
+                    return p;
+                if (p[2] == 0 && p[3] == 1)
+                    return p+1;
+            }
+            if (p[3] == 0) {
+                if (p[2] == 0 && p[4] == 1)
+                    return p+2;
+                if (p[4] == 0 && p[5] == 1)
+                    return p+3;
+            }
+        }
+    }
+
+    for (end += 3; p < end; p++) {
+        if (p[0] == 0 && p[1] == 0 && p[2] == 1)
+            return p;
+    }
+
+    return end + 3;
+}
+
+const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){
+    const uint8_t *out= ff_avc_find_startcode_internal(p, end);
+    if(p<out && out<end && !out[-1]) out--;
+    return out;
+}
+
+int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
+{
+    const uint8_t *p = buf_in;
+    const uint8_t *end = p + size;
+    const uint8_t *nal_start, *nal_end;
+
+    size = 0;
+    nal_start = ff_avc_find_startcode(p, end);
+    for (;;) {
+        while (nal_start < end && !*(nal_start++));
+        if (nal_start == end)
+            break;
+
+        nal_end = ff_avc_find_startcode(nal_start, end);
+        avio_wb32(pb, nal_end - nal_start);
+        avio_write(pb, nal_start, nal_end - nal_start);
+        size += 4 + nal_end - nal_start;
+        nal_start = nal_end;
+    }
+    return size;
+}
+
+int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
+{
+    AVIOContext *pb;
+    int ret = avio_open_dyn_buf(&pb);
+    if(ret < 0)
+        return ret;
+
+    ff_avc_parse_nal_units(pb, buf_in, *size);
+
+    av_freep(buf);
+    *size = avio_close_dyn_buf(pb, buf);
+    return 0;
+}
+
+int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
+{
+    if (len > 6) {
+        /* check for h264 start code */
+        if (AV_RB32(data) == 0x00000001 ||
+            AV_RB24(data) == 0x000001) {
+            uint8_t *buf=NULL, *end, *start;
+            uint32_t sps_size=0, pps_size=0;
+            uint8_t *sps=0, *pps=0;
+
+            int ret = ff_avc_parse_nal_units_buf(data, &buf, &len);
+            if (ret < 0)
+                return ret;
+            start = buf;
+            end = buf + len;
+
+            /* look for sps and pps */
+            while (end - buf > 4) {
+                uint32_t size;
+                uint8_t nal_type;
+                size = FFMIN(AV_RB32(buf), end - buf - 4);
+                buf += 4;
+                nal_type = buf[0] & 0x1f;
+
+                if (nal_type == 7) { /* SPS */
+                    sps = buf;
+                    sps_size = size;
+                } else if (nal_type == 8) { /* PPS */
+                    pps = buf;
+                    pps_size = size;
+                }
+
+                buf += size;
+            }
+
+            if (!sps || !pps || sps_size < 4 || sps_size > UINT16_MAX || pps_size > UINT16_MAX)
+                return AVERROR_INVALIDDATA;
+
+            avio_w8(pb, 1); /* version */
+            avio_w8(pb, sps[1]); /* profile */
+            avio_w8(pb, sps[2]); /* profile compat */
+            avio_w8(pb, sps[3]); /* level */
+            avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
+            avio_w8(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
+
+            avio_wb16(pb, sps_size);
+            avio_write(pb, sps, sps_size);
+            avio_w8(pb, 1); /* number of pps */
+            avio_wb16(pb, pps_size);
+            avio_write(pb, pps, pps_size);
+            av_free(start);
+        } else {
+            avio_write(pb, data, len);
+        }
+    }
+    return 0;
+}
+
+int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
+{
+    uint16_t sps_size, pps_size;
+    uint8_t *out;
+    int out_size;
+
+    *buf = NULL;
+    if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001))
+        return 0;
+    if (*size < 11 || in[0] != 1)
+        return AVERROR_INVALIDDATA;
+
+    sps_size = AV_RB16(&in[6]);
+    if (11 + sps_size > *size)
+        return AVERROR_INVALIDDATA;
+    pps_size = AV_RB16(&in[9 + sps_size]);
+    if (11 + sps_size + pps_size > *size)
+        return AVERROR_INVALIDDATA;
+    out_size = 8 + sps_size + pps_size;
+    out = av_mallocz(out_size);
+    if (!out)
+        return AVERROR(ENOMEM);
+    AV_WB32(&out[0], 0x00000001);
+    memcpy(out + 4, &in[8], sps_size);
+    AV_WB32(&out[4 + sps_size], 0x00000001);
+    memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
+    *buf = out;
+    *size = out_size;
+    return 0;
+}
-- 
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