[FFmpeg-cvslog] Handle interlaced formats (two coding units together make one full frame)
Pilotware
git at videolan.org
Thu Feb 16 03:23:32 CET 2012
ffmpeg | branch: master | Pilotware <pw at pw-t1-inhouse.(none)> | Tue Feb 14 21:35:06 2012 -0800| [7606825350a64ad1c2365a74cac8a5e586f39ff6] | committer: Michael Niedermayer
Handle interlaced formats (two coding units together make one full frame)
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7606825350a64ad1c2365a74cac8a5e586f39ff6
---
libavcodec/dnxhd_parser.c | 42 ++++++++++++++++++++++++++++++++----------
1 files changed, 32 insertions(+), 10 deletions(-)
diff --git a/libavcodec/dnxhd_parser.c b/libavcodec/dnxhd_parser.c
index 819632c..d2076c5 100644
--- a/libavcodec/dnxhd_parser.c
+++ b/libavcodec/dnxhd_parser.c
@@ -26,21 +26,32 @@
#include "parser.h"
-#define DNXHD_HEADER_PREFIX 0x0000028001
+#define DNXHD_HEADER_PREFIX 0x000002800100
-static int dnxhd_find_frame_end(ParseContext *pc,
+typedef struct {
+ ParseContext pc;
+ int interlaced;
+ int cur_field; /* first field is 0, second is 1 */
+} DNXHDParserContext;
+
+static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
const uint8_t *buf, int buf_size)
{
+ ParseContext *pc = &dctx->pc;
uint64_t state = pc->state64;
int pic_found = pc->frame_start_found;
int i = 0;
+ int interlaced = dctx->interlaced;
+ int cur_field = dctx->cur_field;
if (!pic_found) {
for (i = 0; i < buf_size; i++) {
state = (state<<8) | buf[i];
- if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {
+ if ((state & 0xffffffffff00LL) == DNXHD_HEADER_PREFIX) {
i++;
pic_found = 1;
+ interlaced = (state&2)>>1; /* byte following the 5-byte header prefix */
+ cur_field = state&1;
break;
}
}
@@ -51,15 +62,25 @@ static int dnxhd_find_frame_end(ParseContext *pc,
return 0;
for (; i < buf_size; i++) {
state = (state<<8) | buf[i];
- if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {
- pc->frame_start_found = 0;
- pc->state64 = -1;
- return i-4;
+ if ((state & 0xffffffffff00LL) == DNXHD_HEADER_PREFIX) {
+ if (!interlaced || dctx->cur_field) {
+ pc->frame_start_found = 0;
+ pc->state64 = -1;
+ dctx->interlaced = interlaced;
+ dctx->cur_field = 0;
+ return i-5;
+ } else {
+ /* continue, to get the second field */
+ dctx->interlaced = interlaced = (state&2)>>1;
+ dctx->cur_field = cur_field = state&1;
+ }
}
}
}
pc->frame_start_found = pic_found;
pc->state64 = state;
+ dctx->interlaced = interlaced;
+ dctx->cur_field = cur_field;
return END_NOT_FOUND;
}
@@ -68,13 +89,14 @@ static int dnxhd_parse(AVCodecParserContext *s,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
- ParseContext *pc = s->priv_data;
+ DNXHDParserContext *dctx = s->priv_data;
+ ParseContext *pc = &dctx->pc;
int next;
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
} else {
- next = dnxhd_find_frame_end(pc, buf, buf_size);
+ next = dnxhd_find_frame_end(dctx, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
@@ -88,7 +110,7 @@ static int dnxhd_parse(AVCodecParserContext *s,
AVCodecParser ff_dnxhd_parser = {
.codec_ids = { CODEC_ID_DNXHD },
- .priv_data_size = sizeof(ParseContext),
+ .priv_data_size = sizeof(DNXHDParserContext),
.parser_parse = dnxhd_parse,
.parser_close = ff_parse_close,
};
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