1 files changed, 74 insertions, 0 deletions
diff --git a/libavcodec/sipr_parser.c b/libavcodec/sipr_parser.c
new file mode 100644
index 0000000..fba25e1
--- /dev/null
+++ b/libavcodec/sipr_parser.c
@@ -0,0 +1,74 @@
+/*
+ * 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
+ * Sipr audio parser
+ */
+
+#include "parser.h"
+
+typedef struct SiprParserContext{
+    ParseContext pc;
+} SiprParserContext;
+
+static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
+{
+    int next;
+
+    switch (avctx->block_align) {
+    case 20:
+    case 19:
+    case 29:
+    case 37: next = avctx->block_align; break;
+    default:
+        if      (avctx->bit_rate > 12200) next = 20;
+        else if (avctx->bit_rate > 7500 ) next = 19;
+        else if (avctx->bit_rate > 5750 ) next = 29;
+        else                              next = 37;
+    }
+
+    return FFMIN(next, buf_size);
+}
+
+static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
+                      const uint8_t **poutbuf, int *poutbuf_size,
+                      const uint8_t *buf, int buf_size)
+{
+    SiprParserContext *s = s1->priv_data;
+    ParseContext *pc = &s->pc;
+    int next;
+
+    next = sipr_split(avctx, buf, buf_size);
+    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+        *poutbuf = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser ff_sipr_parser = {
+    .codec_ids      = { AV_CODEC_ID_SIPR },
+    .priv_data_size = sizeof(SiprParserContext),
+    .parser_parse   = sipr_parse,
+    .parser_close   = ff_parse_close,
+};