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avformat/wavdec: allow to change max size of single demuxed packet 

Can make demuxing much faster, expecially for files with
huge number of channels.
This commit is contained in:
Paul B Mahol 2020-08-28 02:02:41 +02:00
parent 93aa0bec84
commit 809d6aeffc
1 changed files with 18 additions and 3 deletions
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21
libavformat/wavdec.c
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@ -56,6 +56,7 @@ typedef struct WAVDemuxContext {
int smv_eof;
int audio_eof;
int ignore_length;
int max_size;
int spdif;
int smv_cur_pt;
int smv_given_first;
@ -628,8 +629,6 @@ static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
return AVERROR_EOF;
}
#define MAX_SIZE 4096
static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
@ -706,7 +705,7 @@ smv_out:
wav->data_end = avio_tell(s->pb) + left;
}
size = MAX_SIZE;
size = wav->max_size;
if (st->codecpar->block_align > 1) {
if (size < st->codecpar->block_align)
size = st->codecpar->block_align;
@ -759,6 +758,7 @@ static int wav_read_seek(AVFormatContext *s,
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption demux_options[] = {
{ "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
{ "max_size", "max size of single packet", OFFSET(max_size), AV_OPT_TYPE_INT, { .i64 = 4096 }, 1024, 1 << 22, DEC },
{ NULL },
};
@ -906,6 +906,20 @@ static int w64_read_header(AVFormatContext *s)
return 0;
}
#define OFFSET(x) offsetof(WAVDemuxContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption w64_demux_options[] = {
{ "max_size", "max size of single packet", OFFSET(max_size), AV_OPT_TYPE_INT, { .i64 = 4096 }, 1024, 1 << 22, DEC },
{ NULL }
};
static const AVClass w64_demuxer_class = {
.class_name = "W64 demuxer",
.item_name = av_default_item_name,
.option = w64_demux_options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_w64_demuxer = {
.name = "w64",
.long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
@ -916,5 +930,6 @@ AVInputFormat ff_w64_demuxer = {
.read_seek = wav_read_seek,
.flags = AVFMT_GENERIC_INDEX,
.codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
.priv_class = &w64_demuxer_class,
};
#endif /* CONFIG_W64_DEMUXER */