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fifo: add av_fifo_peek2(), and deprecate av_fifo_peek()

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The new function provides a more generic interface than av_fifo_peek()
for peeking at a FIFO buffer data.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Stefano Sabatini 2011-06-29 17:30:23 +02:00 committed by Anton Khirnov
parent f4f3300c09
commit f2011ed234
4 changed files with 37 additions and 6 deletions
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3
doc/APIchanges
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@ -13,6 +13,9 @@ libavutil: 2011-04-18
API changes, most recent first:
2011-08-xx - xxxxxx - lavu 51.9.0
Add av_fifo_peek2(), deprecate av_fifo_peek().
2011-08-xx - xxxxxxx - lavf 53.4.0
Add avformat_query_codec().

4
libavformat/dvenc.c
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@ -192,8 +192,8 @@ static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
if (of*2 >= size)
continue;
frame_ptr[d] = av_fifo_peek(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
frame_ptr[d+1] = av_fifo_peek(c->audio_data[channel], of*2); // that DV is a big-endian PCM
frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit
frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM
}
frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
}

5
libavutil/avutil.h
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@ -40,7 +40,7 @@
#define AV_VERSION(a, b, c) AV_VERSION_DOT(a, b, c)
#define LIBAVUTIL_VERSION_MAJOR 51
#define LIBAVUTIL_VERSION_MINOR 8
#define LIBAVUTIL_VERSION_MINOR 9
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
@ -63,6 +63,9 @@
#ifndef FF_API_FIND_OPT
#define FF_API_FIND_OPT (LIBAVUTIL_VERSION_MAJOR < 52)
#endif
#ifndef FF_API_AV_FIFO_PEEK
#define FF_API_AV_FIFO_PEEK (LIBAVUTIL_VERSION_MAJOR < 52)
#endif
/**
* Return the LIBAVUTIL_VERSION_INT constant.

31
libavutil/fifo.h
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@ -25,6 +25,7 @@
#define AVUTIL_FIFO_H
#include <stdint.h>
#include "avutil.h"
typedef struct AVFifoBuffer {
uint8_t *buffer;
@ -106,11 +107,35 @@ int av_fifo_realloc2(AVFifoBuffer *f, unsigned int size);
*/
void av_fifo_drain(AVFifoBuffer *f, int size);
static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
/**
* Return a pointer to the data stored in a FIFO buffer at a certain offset.
* The FIFO buffer is not modified.
*
* @param *f AVFifoBuffer to peek at, f must be non-NULL
* @param offs an offset in bytes, its absolute value must be less
* than the used buffer size or the returned pointer will
* point outside to the buffer data.
* The used buffer size can be checked with av_fifo_size().
*/
static inline uint8_t *av_fifo_peek2(const AVFifoBuffer *f, int offs)
{
uint8_t *ptr = f->rptr + offs;
if (ptr >= f->end)
ptr -= f->end - f->buffer;
return *ptr;
ptr = f->buffer + (ptr - f->end);
else if (ptr < f->buffer)
ptr = f->end - (f->buffer - ptr);
return ptr;
}
#if FF_API_AV_FIFO_PEEK
/**
* @deprecated Use av_fifo_peek2() instead.
*/
attribute_deprecated
static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
{
return *av_fifo_peek2(f, offs);
}
#endif
#endif /* AVUTIL_FIFO_H */