From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Thu, 5 Sep 2013 17:57:22 +0100
Subject: making act segmenter

---
 ffmpeg/libavcodec/gsm_parser.c | 92 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 ffmpeg/libavcodec/gsm_parser.c

(limited to 'ffmpeg/libavcodec/gsm_parser.c')

diff --git a/ffmpeg/libavcodec/gsm_parser.c b/ffmpeg/libavcodec/gsm_parser.c
new file mode 100644
index 0000000..dd26f7d
--- /dev/null
+++ b/ffmpeg/libavcodec/gsm_parser.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2012  Justin Ruggles
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * GSM audio parser
+ *
+ * Splits packets into individual blocks.
+ */
+
+#include "parser.h"
+#include "gsm.h"
+
+typedef struct GSMParseContext {
+    ParseContext pc;
+    int block_size;
+    int duration;
+    int remaining;
+} GSMParseContext;
+
+static int gsm_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
+                     const uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size)
+{
+    GSMParseContext *s = s1->priv_data;
+    ParseContext *pc = &s->pc;
+    int next;
+
+    if (!s->block_size) {
+        switch (avctx->codec_id) {
+        case AV_CODEC_ID_GSM:
+            s->block_size = GSM_BLOCK_SIZE;
+            s->duration   = GSM_FRAME_SIZE;
+            break;
+        case AV_CODEC_ID_GSM_MS:
+            s->block_size = GSM_MS_BLOCK_SIZE;
+            s->duration   = GSM_FRAME_SIZE * 2;
+            break;
+        default:
+            *poutbuf      = buf;
+            *poutbuf_size = buf_size;
+            av_log(avctx, AV_LOG_ERROR, "Invalid codec_id\n");
+            return buf_size;
+        }
+    }
+
+    if (!s->remaining)
+        s->remaining = s->block_size;
+    if (s->remaining <= buf_size) {
+        next = s->remaining;
+        s->remaining = 0;
+    } else {
+        next = END_NOT_FOUND;
+        s->remaining -= buf_size;
+    }
+
+    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
+        *poutbuf      = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+
+    s1->duration = s->duration;
+
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser ff_gsm_parser = {
+    .codec_ids      = { AV_CODEC_ID_GSM, AV_CODEC_ID_GSM_MS },
+    .priv_data_size = sizeof(GSMParseContext),
+    .parser_parse   = gsm_parse,
+    .parser_close   = ff_parse_close,
+};
-- 
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