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don't seek back when not neccesary

This commit is contained in:
Isaac Connor 2019-12-13 18:12:33 -05:00
parent 689956bba7
commit 16a73d6d5a
2 changed files with 19 additions and 3 deletions
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19
src/zm_ffmpeg_input.cpp
View File

@ -10,6 +10,7 @@ FFmpeg_Input::FFmpeg_Input() {
FFMPEGInit();
streams = NULL;
frame = NULL;
last_seek_request = -1;
}
FFmpeg_Input::~FFmpeg_Input() {
@ -102,7 +103,6 @@ int FFmpeg_Input::Open(const char *filepath) {
} // end int FFmpeg_Input::Open( const char * filepath )
AVFrame *FFmpeg_Input::get_frame(int stream_id) {
Debug(1, "Getting frame from stream %d", stream_id);
int frameComplete = false;
AVPacket packet;
@ -144,6 +144,8 @@ AVFrame *FFmpeg_Input::get_frame(int stream_id) {
zm_av_packet_unref(&packet);
av_frame_free(&frame);
continue;
} else {
zm_dump_frame(frame, "resulting frame");
}
frameComplete = 1;
@ -177,7 +179,18 @@ AVFrame *FFmpeg_Input::get_frame(int stream_id, double at) {
get_frame(stream_id);
} // end if ! frame
if ( frame->pts > seek_target ) {
if ( !frame ) {
Warning("Unable to get frame.");
return NULL;
}
if (
(last_seek_request >= 0)
&&
(last_seek_request > seek_target )
&&
(frame->pts > seek_target)
) {
zm_dump_frame(frame, "frame->pts > seek_target, seek backwards");
// our frame must be beyond our seek target. so go backwards to before it
if ( ( ret = av_seek_frame(input_format_context, stream_id, seek_target,
@ -191,6 +204,8 @@ AVFrame *FFmpeg_Input::get_frame(int stream_id, double at) {
zm_dump_frame(frame, "frame->pts > seek_target, got");
} // end if frame->pts > seek_target
last_seek_request = seek_target;
// Seeking seems to typically seek to a keyframe, so then we have to decode until we get the frame we want.
if ( frame->pts <= seek_target ) {
zm_dump_frame(frame, "pts <= seek_target");

1
src/zm_ffmpeg_input.h
View File

@ -42,6 +42,7 @@ class FFmpeg_Input {
int audio_stream_id;
AVFormatContext *input_format_context;
AVFrame *frame;
int64_t last_seek_request;
};
#endif