avcodec: add dvaudio parser

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/Makefile

@@ -866,6 +866,7 @@ OBJS-$(CONFIG_DCA_PARSER)              += dca_parser.o dca.o
 OBJS-$(CONFIG_DIRAC_PARSER)            += dirac_parser.o
 OBJS-$(CONFIG_DNXHD_PARSER)            += dnxhd_parser.o
 OBJS-$(CONFIG_DPX_PARSER)              += dpx_parser.o
+OBJS-$(CONFIG_DVAUDIO_PARSER)          += dvaudio_parser.o
 OBJS-$(CONFIG_DVBSUB_PARSER)           += dvbsub_parser.o
 OBJS-$(CONFIG_DVD_NAV_PARSER)          += dvd_nav_parser.o
 OBJS-$(CONFIG_DVDSUB_PARSER)           += dvdsub_parser.o

libavcodec/allcodecs.c

@@ -621,6 +621,7 @@ void avcodec_register_all(void)
     REGISTER_PARSER(DIRAC,              dirac);
     REGISTER_PARSER(DNXHD,              dnxhd);
     REGISTER_PARSER(DPX,                dpx);
+    REGISTER_PARSER(DVAUDIO,            dvaudio);
     REGISTER_PARSER(DVBSUB,             dvbsub);
     REGISTER_PARSER(DVDSUB,             dvdsub);
     REGISTER_PARSER(DVD_NAV,            dvd_nav);

libavcodec/dvaudio.h

@@ -0,0 +1,32 @@
+/*
+ * 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
+ */
+
+static inline int dv_get_audio_sample_count(const uint8_t *buffer, int dsf)
+{
+    int samples = buffer[0] & 0x3f; /* samples in this frame - min samples */
+
+    switch ((buffer[3] >> 3) & 0x07) {
+    case 0:
+        return samples + (dsf ? 1896 : 1580);
+    case 1:
+        return samples + (dsf ? 1742 : 1452);
+    case 2:
+    default:
+        return samples + (dsf ? 1264 : 1053);
+    }
+}

libavcodec/dvaudio_parser.c

@@ -0,0 +1,46 @@
+/*
+ * 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
+ * Ulead DV audio parser
+ *
+ * Determines the duration for each packet.
+ */
+
+#include "parser.h"
+#include "dvaudio.h"
+
+static int dvaudio_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
+                        const uint8_t **poutbuf, int *poutbuf_size,
+                        const uint8_t *buf, int buf_size)
+{
+    if (buf_size >= 248)
+        s1->duration = dv_get_audio_sample_count(buf + 244, avctx->block_align == 8640);
+
+    /* always return the full packet. this parser isn't doing any splitting or
+       combining, only packet analysis */
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return buf_size;
+}
+
+AVCodecParser ff_dvaudio_parser = {
+    .codec_ids      = { AV_CODEC_ID_DVAUDIO },
+    .parser_parse   = dvaudio_parse,
+};

libavcodec/dvaudiodec.c

@@ -21,6 +21,7 @@
 #include "libavutil/intreadwrite.h"
 #include "avcodec.h"
 #include "internal.h"
+#include "dvaudio.h"
 
 typedef struct DVAudioContext {
     int block_size;
@@ -66,21 +67,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
     return 0;
 }
 
-static inline int dv_get_audio_sample_count(const uint8_t *buffer, int dsf)
-{
-    int samples = buffer[0] & 0x3f; /* samples in this frame - min samples */
-
-    switch ((buffer[3] >> 3) & 0x07) {
-    case 0:
-        return samples + (dsf ? 1896 : 1580);
-    case 1:
-        return samples + (dsf ? 1742 : 1452);
-    case 2:
-    default:
-        return samples + (dsf ? 1264 : 1053);
-    }
-}
-
 static inline uint16_t dv_audio_12to16(uint16_t sample)
 {
     uint16_t shift, result;