[FFmpeg-cvslog] avcodec: add Micronas SC-4 parser
Paul B Mahol
git at videolan.org
Fri Sep 16 11:01:46 EEST 2022
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Fri Sep 9 09:57:12 2022 +0200| [e91bc521afff17a73012af153f219c3e5f3f2ce5] | committer: Paul B Mahol
avcodec: add Micronas SC-4 parser
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e91bc521afff17a73012af153f219c3e5f3f2ce5
---
libavcodec/Makefile | 1 +
libavcodec/misc4_parser.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/parsers.c | 1 +
3 files changed, 83 insertions(+)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 4112a0fb2e..e938564a1f 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1143,6 +1143,7 @@ OBJS-$(CONFIG_HEVC_PARSER) += hevc_parser.o hevc_data.o
OBJS-$(CONFIG_HDR_PARSER) += hdr_parser.o
OBJS-$(CONFIG_IPU_PARSER) += ipu_parser.o
OBJS-$(CONFIG_JPEG2000_PARSER) += jpeg2000_parser.o
+OBJS-$(CONFIG_MISC4_PARSER) += misc4_parser.o
OBJS-$(CONFIG_MJPEG_PARSER) += mjpeg_parser.o
OBJS-$(CONFIG_MLP_PARSER) += mlp_parse.o mlp_parser.o mlp.o
OBJS-$(CONFIG_MPEG4VIDEO_PARSER) += mpeg4video_parser.o h263.o \
diff --git a/libavcodec/misc4_parser.c b/libavcodec/misc4_parser.c
new file mode 100644
index 0000000000..d234dbb629
--- /dev/null
+++ b/libavcodec/misc4_parser.c
@@ -0,0 +1,81 @@
+/*
+ * Micronas SC-4 parser
+ *
+ * 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
+ */
+
+#include "parser.h"
+
+typedef struct MISC4Context {
+ ParseContext pc;
+} MISC4Context;
+
+static int misc4_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ MISC4Context *ctx = s->priv_data;
+ uint32_t state = ctx->pc.state;
+ int next = END_NOT_FOUND, i = 0;
+
+ *poutbuf_size = 0;
+ *poutbuf = NULL;
+
+ if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+ next = buf_size;
+ } else {
+ uint32_t marker = 0;
+
+ switch (avctx->sample_rate) {
+ case 8000:
+ case 11025:
+ marker = 0x11b;
+ break;
+ case 16000:
+ case 32000:
+ marker = 0x2b2;
+ break;
+ }
+
+ for (; i < buf_size; i++) {
+ state = (state << 8) | buf[i];
+ if (state == marker && i > 3) {
+ next = i - 3;
+ break;
+ }
+ }
+
+ ctx->pc.state = state;
+ if (ff_combine_frame(&ctx->pc, next, &buf, &buf_size) < 0) {
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+ return buf_size;
+ }
+ }
+
+ *poutbuf = buf;
+ *poutbuf_size = buf_size;
+
+ return next;
+}
+
+const AVCodecParser ff_misc4_parser = {
+ .codec_ids = { AV_CODEC_ID_MISC4 },
+ .priv_data_size = sizeof(MISC4Context),
+ .parser_parse = misc4_parse,
+ .parser_close = ff_parse_close,
+};
diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c
index a8d52af6cb..362f6f8bc6 100644
--- a/libavcodec/parsers.c
+++ b/libavcodec/parsers.c
@@ -53,6 +53,7 @@ extern const AVCodecParser ff_hevc_parser;
extern const AVCodecParser ff_hdr_parser;
extern const AVCodecParser ff_ipu_parser;
extern const AVCodecParser ff_jpeg2000_parser;
+extern const AVCodecParser ff_misc4_parser;
extern const AVCodecParser ff_mjpeg_parser;
extern const AVCodecParser ff_mlp_parser;
extern const AVCodecParser ff_mpeg4video_parser;
More information about the ffmpeg-cvslog
mailing list