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Code Issues Releases Activity

avformat/file: add pkt_size option

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The min_packet_size/max_packet_size were hardcoded to 256KB for
performance. The new option makes it possible to configure a
smaller packet size on embedded devices with limited memory
resources.

Signed-off-by: yangsen5 <1441923451@qq.com>
Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
yangsen5
2025-07-31 17:05:07 +08:00
committed by Zhao Zhili
parent 1b62f9d3ae
commit 6c07a4f558
2 changed files with 4 additions and 2 deletions
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4
libavformat/file.c
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@@ -94,6 +94,7 @@ typedef struct FileContext {
int fd;
int trunc;
int blocksize;
int pkt_size;
int follow;
int seekable;
#if HAVE_DIRENT_H
@@ -106,6 +107,7 @@ static const AVOption file_options[] = {
{ "blocksize", "set I/O operation maximum block size", offsetof(FileContext, blocksize), AV_OPT_TYPE_INT, { .i64 = INT_MAX }, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ "follow", "Follow a file as it is being written", offsetof(FileContext, follow), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "seekable", "Sets if the file is seekable", offsetof(FileContext, seekable), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ "pkt_size", "Maximum packet size", offsetof(FileContext, pkt_size), AV_OPT_TYPE_INT, { .i64 = 262144 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ NULL }
};
@@ -313,7 +315,7 @@ static int file_open(URLContext *h, const char *filename, int flags)
/* Buffer writes more than the default 32k to improve throughput especially
* with networked file systems */
if (!h->is_streamed && flags & AVIO_FLAG_WRITE)
h->min_packet_size = h->max_packet_size = 262144;
h->min_packet_size = h->max_packet_size = c->pkt_size;
if (c->seekable >= 0)
h->is_streamed = !c->seekable;

2
libavformat/version.h
View File

@@ -32,7 +32,7 @@
#include "version_major.h"
#define LIBAVFORMAT_VERSION_MINOR 4
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_MICRO 101
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \