[FFmpeg-devel] [PATCH] avcodec: add dpx parser

[Paul B Mahol]

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavcodec/Makefile     |   1 +
 libavcodec/allcodecs.c  |   1 +
 libavcodec/dpx_parser.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 110 insertions(+)
 create mode 100644 libavcodec/dpx_parser.c

diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index bd5c0be..230c3f3 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -744,6 +744,7 @@ OBJS-$(CONFIG_COOK_PARSER)             += cook_parser.o
 OBJS-$(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_DVBSUB_PARSER)           += dvbsub_parser.o
 OBJS-$(CONFIG_DVD_NAV_PARSER)          += dvd_nav_parser.o
 OBJS-$(CONFIG_DVDSUB_PARSER)           += dvdsub_parser.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index bf58d2b..8e08a23 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -525,6 +525,7 @@ void avcodec_register_all(void)
     REGISTER_PARSER(DCA,                dca);
     REGISTER_PARSER(DIRAC,              dirac);
     REGISTER_PARSER(DNXHD,              dnxhd);
+    REGISTER_PARSER(DPX,                dpx);
     REGISTER_PARSER(DVBSUB,             dvbsub);
     REGISTER_PARSER(DVDSUB,             dvdsub);
     REGISTER_PARSER(DVD_NAV,            dvd_nav);
diff --git a/libavcodec/dpx_parser.c b/libavcodec/dpx_parser.c
new file mode 100644
index 0000000..70baaf4
--- /dev/null
+++ b/libavcodec/dpx_parser.c
@@ -0,0 +1,108 @@
+/*
+ * DPX parser
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * 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
+ * DPX parser
+ */
+
+#include "libavutil/bswap.h"
+#include "parser.h"
+
+typedef struct DPXParseContext {
+    ParseContext pc;
+    uint32_t index;
+    uint32_t fsize;
+    uint32_t remaining_size;
+    int is_be;
+} DPXParseContext;
+
+static int dpx_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+                     const uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size)
+{
+    DPXParseContext *d = s->priv_data;
+    uint32_t state = d->pc.state;
+    int next = END_NOT_FOUND;
+    int i = 0;
+
+    s->pict_type = AV_PICTURE_TYPE_I;
+
+    *poutbuf_size = 0;
+    if (buf_size == 0)
+        return 0;
+
+    if (!d->pc.frame_start_found) {
+        for (; i < buf_size; i++) {
+            state = (state << 8) | buf[i];
+            if (state == MKBETAG('S','D','P','X') ||
+                state == MKTAG('S','D','P','X')) {
+                d->pc.frame_start_found = 1;
+                d->is_be = state == MKBETAG('S','D','P','X');
+                break;
+            }
+        }
+        d->pc.state = state;
+    } else {
+        if (d->remaining_size) {
+            i = FFMIN(d->remaining_size, buf_size);
+            d->remaining_size -= i;
+            if (d->remaining_size)
+                goto flush;
+            next = i;
+        }
+    }
+
+    for (;d->pc.frame_start_found && i < buf_size; i++) {
+        d->pc.state = (d->pc.state << 8) | buf[i];
+        if (d->index == 16) {
+            d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state);
+            if (d->fsize <= 1664) {
+                d->index = d->pc.frame_start_found = 0;
+                goto flush;
+            }
+            d->index = 0;
+            if (d->fsize > buf_size - i + 19)
+                d->remaining_size = d->fsize - buf_size + i - 19;
+            else
+                next = d->fsize + i - 19;
+            break;
+        }
+        d->index++;
+    }
+
+flush:
+    if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0)
+        return buf_size;
+
+    d->index = d->pc.frame_start_found = 0;
+
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser ff_dpx_parser = {
+    .codec_ids      = { AV_CODEC_ID_DPX },
+    .priv_data_size = sizeof(DPXParseContext),
+    .parser_parse   = dpx_parse,
+    .parser_close   = ff_parse_close,
+};
-- 
1.7.11.2