diff options
Diffstat (limited to 'doc/filter_design.txt')
| -rw-r--r-- | doc/filter_design.txt | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/doc/filter_design.txt b/doc/filter_design.txt index d784d8471e..e8a7c53ee9 100644 --- a/doc/filter_design.txt +++ b/doc/filter_design.txt @@ -232,7 +232,8 @@ Frame scheduling one of its inputs, repeatedly until at least one frame has been pushed. Return values: - if request_frame could produce a frame, it should return 0; + if request_frame could produce a frame, or at least make progress + towards producing a frame, it should return 0; if it could not for temporary reasons, it should return AVERROR(EAGAIN); if it could not because there are no more frames, it should return AVERROR_EOF. @@ -244,20 +245,18 @@ Frame scheduling push_one_frame(); return 0; } - while (!frame_pushed) { - input = input_where_a_frame_is_most_needed(); - ret = ff_request_frame(input); - if (ret == AVERROR_EOF) { - process_eof_on_input(); - } else if (ret < 0) { - return ret; - } + input = input_where_a_frame_is_most_needed(); + ret = ff_request_frame(input); + if (ret == AVERROR_EOF) { + process_eof_on_input(); + } else if (ret < 0) { + return ret; } return 0; Note that, except for filters that can have queued frames, request_frame does not push frames: it requests them to its input, and as a reaction, - the filter_frame method will be called and do the work. + the filter_frame method possibly will be called and do the work. Legacy API ========== |