diff options
| -rw-r--r-- | libavformat/libopenmpt.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/libavformat/libopenmpt.c b/libavformat/libopenmpt.c index 5efbdc4273..0fff702a36 100644 --- a/libavformat/libopenmpt.c +++ b/libavformat/libopenmpt.c @@ -218,6 +218,62 @@ static int read_seek_openmpt(AVFormatContext *s, int stream_idx, int64_t ts, int return 0; } +static int probe_openmpt_extension(AVProbeData *p) +{ + const char *ext; + if (p->filename) { + ext = strrchr(p->filename, '.'); + if (ext && strlen(ext + 1) > 0) { + ext++; /* skip '.' */ + if (openmpt_is_extension_supported(ext) == 1) + return AVPROBE_SCORE_EXTENSION; + } + } + return 0; +} + +static int read_probe_openmpt(AVProbeData *p) +{ +#if OPENMPT_API_VERSION_AT_LEAST(0,3,0) + int probe_result; + if (p->buf && p->buf_size > 0) { + probe_result = openmpt_probe_file_header_without_filesize( + OPENMPT_PROBE_FILE_HEADER_FLAGS_DEFAULT, + p->buf, p->buf_size, + &openmpt_logfunc, NULL, NULL, NULL, NULL, NULL); + if (probe_result == OPENMPT_PROBE_FILE_HEADER_RESULT_SUCCESS) { + /* As probing here relies on code external to FFmpeg, do not return + * AVPROBE_SCORE_MAX in order to reduce the impact in the rare + * cases of false positives. + */ + return AVPROBE_SCORE_MIME + 1; + } else if (probe_result == OPENMPT_PROBE_FILE_HEADER_RESULT_WANTMOREDATA) { + if (probe_openmpt_extension(p) > 0) { + return AVPROBE_SCORE_RETRY; + } else { + if (p->buf_size >= openmpt_probe_file_header_get_recommended_size()) { + /* We have already received the recommended amount of data + * and still cannot decide. Return a rather low score. + */ + return AVPROBE_SCORE_RETRY / 2; + } else { + /* The file extension is unknown and we have very few data + * bytes available. libopenmpt cannot decide anything here, + * and returning any score > 0 would result in successfull + * probing of random data. + */ + return 0; + } + } + } else if (probe_result == OPENMPT_PROBE_FILE_HEADER_RESULT_FAILURE) { + return 0; + } + } +#endif + /* for older libopenmpt, fall back to file extension probing */ + return probe_openmpt_extension(p); +} + static const AVClass class_openmpt = { .class_name = "libopenmpt", .item_name = av_default_item_name, @@ -229,6 +285,7 @@ AVInputFormat ff_libopenmpt_demuxer = { .name = "libopenmpt", .long_name = NULL_IF_CONFIG_SMALL("Tracker formats (libopenmpt)"), .priv_data_size = sizeof(OpenMPTContext), + .read_probe = read_probe_openmpt, .read_header = read_header_openmpt, .read_packet = read_packet_openmpt, .read_close = read_close_openmpt, |