RTSP: Decouple MPEG-4 and AAC specific parts from rtsp.c

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23769 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 125 insertions, 0 deletions

diff --git a/libavformat/rtpdec_mpeg4.c b/libavformat/rtpdec_mpeg4.c
new file mode 100644
index 0000000000..8befef21ef
--- /dev/null
+++ b/libavformat/rtpdec_mpeg4.c
@@ -0,0 +1,125 @@
+/**
+ * Common code for the RTP depacketization of MPEG-4 formats.
+ * Copyright (c) 2010 Fabrice Bellard
+ *                    Romain Degez
+ *
+ * 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
+ * @brief MPEG4 / RTP Code
+ * @author Fabrice Bellard
+ * @author Romain Degez
+ */
+
+#include "rtpdec_mpeg4.h"
+#include "internal.h"
+#include "libavutil/avstring.h"
+
+/* return the length and optionally the data */
+static int hex_to_data(uint8_t *data, const char *p)
+{
+    int c, len, v;
+
+    len = 0;
+    v = 1;
+    for (;;) {
+        p += strspn(p, SPACE_CHARS);
+        if (*p == '\0')
+            break;
+        c = toupper((unsigned char) *p++);
+        if (c >= '0' && c <= '9')
+            c = c - '0';
+        else if (c >= 'A' && c <= 'F')
+            c = c - 'A' + 10;
+        else
+            break;
+        v = (v << 4) | c;
+        if (v & 0x100) {
+            if (data)
+                data[len] = v;
+            len++;
+            v = 1;
+        }
+    }
+    return len;
+}
+
+static int parse_fmtp_config(AVCodecContext * codec, char *value)
+{
+    /* decode the hexa encoded parameter */
+    int len = hex_to_data(NULL, value);
+    if (codec->extradata)
+        av_free(codec->extradata);
+    codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!codec->extradata)
+        return AVERROR(ENOMEM);
+    codec->extradata_size = len;
+    hex_to_data(codec->extradata, value);
+    return 0;
+}
+
+static int parse_sdp_line(AVFormatContext *s, int st_index,
+                          PayloadContext *data, const char *line)
+{
+    const char *p;
+    char value[4096], attr[25];
+    int res = 0;
+    AVCodecContext* codec = s->streams[st_index]->codec;
+
+    if (av_strstart(line, "fmtp:", &p)) {
+        // remove protocol identifier
+        while (*p && *p == ' ') p++; // strip spaces
+        while (*p && *p != ' ') p++; // eat protocol identifier
+        while (*p && *p == ' ') p++; // strip trailing spaces
+
+        while (ff_rtsp_next_attr_and_value(&p,
+                                           attr, sizeof(attr),
+                                           value, sizeof(value))) {
+            if (!strcmp(attr, "config")) {
+                res = parse_fmtp_config(codec, value);
+
+                if (res < 0)
+                    return res;
+            }
+        }
+    }
+
+    return 0;
+
+}
+
+RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
+    .enc_name           = "MP4V-ES",
+    .codec_type         = AVMEDIA_TYPE_VIDEO,
+    .codec_id           = CODEC_ID_MPEG4,
+    .parse_sdp_a_line   = parse_sdp_line,
+    .open               = NULL,
+    .close              = NULL,
+    .parse_packet       = NULL
+};
+
+RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
+    .enc_name           = "mpeg4-generic",
+    .codec_type         = AVMEDIA_TYPE_AUDIO,
+    .codec_id           = CODEC_ID_AAC,
+    .parse_sdp_a_line   = parse_sdp_line,
+    .open               = NULL,
+    .close              = NULL,
+    .parse_packet       = NULL
+};