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authorPaul B Mahol <onemda@gmail.com>2014-12-01 16:20:09 +0100
committerVittorio Giovara <vittorio.giovara@gmail.com>2014-12-18 23:22:59 +0100
commit87bd298abeb901fe16383a0d267502cc7fc03878 (patch)
tree44683494884ce4a981899514b438ba2a4cd8847b /libavcodec/dpx_parser.c
parent3a3790b8f8b56ee6abc93ccac280eb693675e294 (diff)
downloadffmpeg-87bd298abeb901fe16383a0d267502cc7fc03878.tar.gz
DPX parser
Additional improvements and fixes by Michael Niedermayer <michaelni@gmx.at>. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Diffstat (limited to 'libavcodec/dpx_parser.c')
-rw-r--r--libavcodec/dpx_parser.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/libavcodec/dpx_parser.c b/libavcodec/dpx_parser.c
new file mode 100644
index 0000000000..e3a7ac5c35
--- /dev/null
+++ b/libavcodec/dpx_parser.c
@@ -0,0 +1,116 @@
+/*
+ * DPX parser
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * 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
+ * DPX parser
+ */
+
+#include "libavutil/bswap.h"
+#include "libavutil/common.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)
+ next = 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');
+ d->index = 0;
+ 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;
+ }
+ }
+
+ for (; d->pc.frame_start_found && i < buf_size; i++) {
+ d->pc.state = (d->pc.state << 8) | buf[i];
+ d->index++;
+ if (d->index == 17) {
+ d->fsize = d->is_be ? d->pc.state : av_bswap32(d->pc.state);
+ if (d->fsize <= 1664) {
+ d->pc.frame_start_found = 0;
+ goto flush;
+ }
+ if (d->fsize > buf_size - i + 19)
+ d->remaining_size = d->fsize - buf_size + i - 19;
+ else
+ i += d->fsize - 19;
+
+ break;
+ } else if (d->index > 17) {
+ if (d->pc.state == MKBETAG('S','D','P','X') ||
+ d->pc.state == MKTAG('S','D','P','X')) {
+ next = i - 3;
+ break;
+ }
+ }
+ }
+
+flush:
+ if (ff_combine_frame(&d->pc, next, &buf, &buf_size) < 0)
+ return buf_size;
+
+ 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,
+};