From 5f3a081b42b84404a40a52c80ef7a354cf048c56 Mon Sep 17 00:00:00 2001 From: Luca Barbato Date: Sat, 28 Nov 2015 21:06:11 +0100 Subject: avi: Spin out the logic to position to the next non-interleaved stream Signed-off-by: Luca Barbato --- libavformat/avidec.c | 134 +++++++++++++++++++++++++++------------------------ 1 file changed, 72 insertions(+), 62 deletions(-) (limited to 'libavformat/avidec.c') diff --git a/libavformat/avidec.c b/libavformat/avidec.c index 477e04556f..4cebd17919 100644 --- a/libavformat/avidec.c +++ b/libavformat/avidec.c @@ -1094,6 +1094,75 @@ start_sync: return AVERROR_EOF; } +static int ni_prepare_read(AVFormatContext *s) +{ + AVIContext *avi = s->priv_data; + int best_stream_index = 0; + AVStream *best_st = NULL; + AVIStream *best_ast; + int64_t best_ts = INT64_MAX; + int i; + + for (i = 0; i < s->nb_streams; i++) { + AVStream *st = s->streams[i]; + AVIStream *ast = st->priv_data; + int64_t ts = ast->frame_offset; + int64_t last_ts; + + if (!st->nb_index_entries) + continue; + + last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; + if (!ast->remaining && ts > last_ts) + continue; + + ts = av_rescale_q(ts, st->time_base, + (AVRational) { FFMAX(1, ast->sample_size), + AV_TIME_BASE }); + + av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts, + st->time_base.num, st->time_base.den, ast->frame_offset); + if (ts < best_ts) { + best_ts = ts; + best_st = st; + best_stream_index = i; + } + } + if (!best_st) + return AVERROR_EOF; + + best_ast = best_st->priv_data; + best_ts = av_rescale_q(best_ts, + (AVRational) { FFMAX(1, best_ast->sample_size), + AV_TIME_BASE }, + best_st->time_base); + if (best_ast->remaining) { + i = av_index_search_timestamp(best_st, + best_ts, + AVSEEK_FLAG_ANY | + AVSEEK_FLAG_BACKWARD); + } else { + i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); + if (i >= 0) + best_ast->frame_offset = best_st->index_entries[i].timestamp; + } + + if (i >= 0) { + int64_t pos = best_st->index_entries[i].pos; + pos += best_ast->packet_size - best_ast->remaining; + avio_seek(s->pb, pos + 8, SEEK_SET); + + assert(best_ast->remaining <= best_ast->packet_size); + + avi->stream_index = best_stream_index; + if (!best_ast->remaining) + best_ast->packet_size = + best_ast->remaining = best_st->index_entries[i].size; + } + + return 0; +} + static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) { AVIContext *avi = s->priv_data; @@ -1109,68 +1178,9 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) } if (avi->non_interleaved) { - int best_stream_index = 0; - AVStream *best_st = NULL; - AVIStream *best_ast; - int64_t best_ts = INT64_MAX; - int i; - - for (i = 0; i < s->nb_streams; i++) { - AVStream *st = s->streams[i]; - AVIStream *ast = st->priv_data; - int64_t ts = ast->frame_offset; - int64_t last_ts; - - if (!st->nb_index_entries) - continue; - - last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; - if (!ast->remaining && ts > last_ts) - continue; - - ts = av_rescale_q(ts, st->time_base, - (AVRational) { FFMAX(1, ast->sample_size), - AV_TIME_BASE }); - - av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts, - st->time_base.num, st->time_base.den, ast->frame_offset); - if (ts < best_ts) { - best_ts = ts; - best_st = st; - best_stream_index = i; - } - } - if (!best_st) - return AVERROR_EOF; - - best_ast = best_st->priv_data; - best_ts = av_rescale_q(best_ts, - (AVRational) { FFMAX(1, best_ast->sample_size), - AV_TIME_BASE }, - best_st->time_base); - if (best_ast->remaining) { - i = av_index_search_timestamp(best_st, - best_ts, - AVSEEK_FLAG_ANY | - AVSEEK_FLAG_BACKWARD); - } else { - i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY); - if (i >= 0) - best_ast->frame_offset = best_st->index_entries[i].timestamp; - } - - if (i >= 0) { - int64_t pos = best_st->index_entries[i].pos; - pos += best_ast->packet_size - best_ast->remaining; - avio_seek(s->pb, pos + 8, SEEK_SET); - - assert(best_ast->remaining <= best_ast->packet_size); - - avi->stream_index = best_stream_index; - if (!best_ast->remaining) - best_ast->packet_size = - best_ast->remaining = best_st->index_entries[i].size; - } + err = ni_prepare_read(s); + if (err < 0) + return err; } resync: -- cgit v1.2.3