Moving image stream processing apparatus, moving image reproduction apparatus equipped with the same, method, and program

摘要

Disclosed is a moving image reproduction apparatus including a stream extraction unit that extracts a bit stream of a prescribed number of consecutive pictures including an intra-frame coded picture as an initial picture from a bit stream of a coded moving image, a stream analysis unit that analyzes the extracted bit stream and decides whether or not, if decoding of the extracted bit stream is performed, one screen of decoded image including the intra-frame coded picture can be obtained, and a stream generation unit that generates a bit stream which complements an image of a region in which a decoded image cannot be obtained in one screen, based on a result of the analysis made by the stream analysis unit, when it is decided in the stream analysis unit that one screen of decoded image cannot be obtained.

主权项

1. A moving image stream processing apparatus comprising:
a stream analysis unit that performs analysis of an intra-frame coded picture and a prescribed number of pictures subsequent to the intra-coded picture extracted from a bit stream of a coded moving image and that decides whether or not decoding of the extracted intra-frame coded picture and the prescribed number of pictures subsequent to the intra-coded picture can provide one screen of decoded image including the intra-frame coded picture, the stream analysis unit deciding that one screen of decoded image including the intra-coded picture can be obtained only with the bit stream of the intra-coded picture and the prescribed number of pictures subsequent to the intra-coded picture extracted, if a condition that the intra coded picture and the subsequent picture are a complementary field pair, and either the intra coded picture is an IDR (Instantaneous decoding Refresh) picture or the subsequent picture is an intra coded picture, in H.264 is met, while the stream analysis unit deciding that the one screen of decoded image cannot be obtained from only the bit stream of the intra-coded picture and the prescribed number of pictures subsequent to the intra-coded picture, otherwise; a stream generation unit that generates a bit stream of coded picture corresponding to an image of a region, in which a decoded image cannot be obtained, in one screen, based on the result of the analysis by the stream analysis unit, when it is decided in the stream analysis unit that the decoding of the extracted intra-frame coded picture and the prescribed number of pictures subsequent to the intra-coded picture cannot provide one screen of decoded image including the intra-frame coded picture; and a stream synthesis unit that receives the extracted bit stream of the intra-coded picture and the prescribed number of pictures subsequent to the intra-coded picture, or receives the extracted bit stream of the intra-coded picture and the prescribed number of pictures subsequent to the intra-coded picture and the bit stream generated by the stream generation unit and that synthesizes, from the received bit streams, an output bit stream of the coded pictures, from which one screen of decoded image can be obtained by a moving image decoding apparatus.