[FFmpeg-cvslog] avformat/flvdec: make key frame timestamps more accurate
Zhao Zhili
git at videolan.org
Wed Aug 3 13:04:26 EEST 2022
ffmpeg | branch: master | Zhao Zhili <zhilizhao at tencent.com> | Fri Jul 29 12:43:09 2022 +0800| [988838cf4f1e6e217226f9520303a948b2294ae2] | committer: Zhao Zhili
avformat/flvdec: make key frame timestamps more accurate
There was an implicit cast from double to int64_t in time unit of
second.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=988838cf4f1e6e217226f9520303a948b2294ae2
---
libavformat/flvdec.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 8dba92661b..10f0ea7736 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -146,9 +146,9 @@ static void add_keyframes_index(AVFormatContext *s)
if (ffstream(stream)->nb_index_entries == 0) {
for (i = 0; i < flv->keyframe_count; i++) {
av_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",
- flv->keyframe_filepositions[i], flv->keyframe_times[i] * 1000);
+ flv->keyframe_filepositions[i], flv->keyframe_times[i]);
av_add_index_entry(stream, flv->keyframe_filepositions[i],
- flv->keyframe_times[i] * 1000, 0, 0, AVINDEX_KEYFRAME);
+ flv->keyframe_times[i], 0, 0, AVINDEX_KEYFRAME);
}
} else
av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
@@ -428,6 +428,7 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
int64_t **current_array;
unsigned int arraylen;
+ int factor;
// Expect array object in context
if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
@@ -440,10 +441,12 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
current_array = ×
timeslen = arraylen;
+ factor = 1000;
} else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
!filepositions) {
current_array = &filepositions;
fileposlen = arraylen;
+ factor = 1;
} else
// unexpected metatag inside keyframes, will not use such
// metadata for indexing
@@ -458,11 +461,9 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
double d;
if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
goto invalid;
- d = av_int2double(avio_rb64(ioc));
+ d = av_int2double(avio_rb64(ioc)) * factor;
if (isnan(d) || d < INT64_MIN || d > INT64_MAX)
goto invalid;
- if (current_array == × && (d <= INT64_MIN / 1000 || d >= INT64_MAX / 1000))
- goto invalid;
if (avio_feof(ioc))
goto invalid;
current_array[0][i] = d;
@@ -478,7 +479,7 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
for (i = 0; i < FFMIN(2,fileposlen); i++) {
flv->validate_index[i].pos = filepositions[i];
- flv->validate_index[i].dts = times[i] * 1000;
+ flv->validate_index[i].dts = times[i];
flv->validate_count = i + 1;
}
flv->keyframe_times = times;
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