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lavf: make avio_read_partial() public

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Main use-case is proxying avio through a foreign I/O layer and a custom
AVIO context, without losing latency and performance characteristics.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Merged from Libav commit 173b56218f.
This commit is contained in:
wm4 2017-08-17 15:01:44 +02:00
parent 877076ffa1
commit 5d76674756
7 changed files with 16 additions and 12 deletions
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3
doc/APIchanges
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@ -15,6 +15,9 @@ libavutil: 2015-08-28
API changes, most recent first:
2017-09-01 - xxxxxxx - lavf 57.81.100 - avio.h
Add avio_read_partial().
2017-09-01 - xxxxxxx - lavf 57.80.100 / 57.11.0 - avio.h
Add avio_context_free(). From now on it must be used for freeing AVIOContext.

9
libavformat/avio.h
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@ -598,6 +598,15 @@ void avio_flush(AVIOContext *s);
*/
int avio_read(AVIOContext *s, unsigned char *buf, int size);
/**
* Read size bytes from AVIOContext into buf. Unlike avio_read(), this is allowed
* to read fewer bytes than requested. The missing bytes can be read in the next
* call. This always tries to read at least 1 byte.
* Useful to reduce latency in certain cases.
* @return number of bytes read or AVERROR
*/
int avio_read_partial(AVIOContext *s, unsigned char *buf, int size);
/**
* @name Functions for reading from AVIOContext
* @{

8
libavformat/avio_internal.h
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@ -53,14 +53,6 @@ int ffio_init_context(AVIOContext *s,
*/
int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
/**
* Read size bytes from AVIOContext into buf.
* This reads at most 1 packet. If that is not enough fewer bytes will be
* returned.
* @return number of bytes read or AVERROR
*/
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
void ffio_fill(AVIOContext *s, int b, int count);
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)

2
libavformat/aviobuf.c
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@ -703,7 +703,7 @@ int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsig
}
}
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
int avio_read_partial(AVIOContext *s, unsigned char *buf, int size)
{
int len;

2
libavformat/rawdec.c
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@ -43,7 +43,7 @@ int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
pkt->pos= avio_tell(s->pb);
pkt->stream_index = 0;
ret = ffio_read_partial(s->pb, pkt->data, size);
ret = avio_read_partial(s->pb, pkt->data, size);
if (ret < 0) {
av_packet_unref(pkt);
return ret;

2
libavformat/rtsp.c
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@ -2136,7 +2136,7 @@ redo:
wait_end && wait_end < av_gettime_relative())
len = AVERROR(EAGAIN);
else
len = ffio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
len = avio_read_partial(s->pb, rt->recvbuf, RECVBUF_SIZE);
len = pick_stream(s, &rtsp_st, rt->recvbuf, len);
if (len > 0 && rtsp_st->transport_priv && rt->transport == RTSP_TRANSPORT_RTP)
ff_rtp_check_and_send_back_rr(rtsp_st->transport_priv, NULL, s->pb, len);

2
libavformat/version.h
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@ -32,7 +32,7 @@
// Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
// Also please add any ticket numbers that you believe might be affected here
#define LIBAVFORMAT_VERSION_MAJOR 57
#define LIBAVFORMAT_VERSION_MINOR 80
#define LIBAVFORMAT_VERSION_MINOR 81
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \