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LibMedia: Use integer math to calculate the FFmpeg seek target pts

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Zaggy1024 2025-10-06 17:46:00 -05:00 committed by Jelle Raaijmakers
parent e9495d0ba0
commit 9c960c3307
1 changed files with 19 additions and 4 deletions
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23
Libraries/LibMedia/FFmpeg/FFmpegDemuxer.cpp
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@ -69,6 +69,23 @@ static inline AK::Duration time_units_to_duration(i64 time_units, AVRational con
return time_units_to_duration(time_units, time_base.num, time_base.den);
}
static inline i64 duration_to_time_units(AK::Duration duration, int numerator, int denominator)
{
VERIFY(numerator != 0);
VERIFY(denominator != 0);
auto seconds = duration.to_truncated_seconds();
auto nanoseconds = (duration - AK::Duration::from_seconds(seconds)).to_nanoseconds();
auto time_units = seconds * denominator / numerator;
time_units += nanoseconds * denominator / numerator / 1'000'000'000;
return time_units;
}
static inline i64 duration_to_time_units(AK::Duration duration, AVRational const& time_base)
{
return duration_to_time_units(duration, time_base.num, time_base.den);
}
DecoderErrorOr<AK::Duration> FFmpegDemuxer::total_duration()
{
if (m_format_context->duration < 0) {
@ -145,11 +162,9 @@ DecoderErrorOr<DemuxerSeekResult> FFmpegDemuxer::seek_to_most_recent_keyframe(Tr
{
VERIFY(track.identifier() < m_format_context->nb_streams);
auto* stream = m_format_context->streams[track.identifier()];
auto time_base = av_q2d(stream->time_base);
auto time_in_seconds = static_cast<double>(timestamp.to_milliseconds()) / 1000.0 / time_base;
auto sample_timestamp = AK::round_to<int64_t>(time_in_seconds);
auto target_pts = duration_to_time_units(timestamp, stream->time_base);
if (av_seek_frame(m_format_context, stream->index, sample_timestamp, AVSEEK_FLAG_BACKWARD) < 0)
if (av_seek_frame(m_format_context, stream->index, target_pts, AVSEEK_FLAG_BACKWARD) < 0)
return DecoderError::format(DecoderErrorCategory::Unknown, "Failed to seek");
return DemuxerSeekResult::MovedPosition;