From f2011ed234f580de01768257f3da6e73fbf8ac7b Mon Sep 17 00:00:00 2001 From: Stefano Sabatini Date: Wed, 29 Jun 2011 17:30:23 +0200 Subject: fifo: add av_fifo_peek2(), and deprecate av_fifo_peek() The new function provides a more generic interface than av_fifo_peek() for peeking at a FIFO buffer data. Signed-off-by: Anton Khirnov --- doc/APIchanges | 3 +++ libavformat/dvenc.c | 4 ++-- libavutil/avutil.h | 5 ++++- libavutil/fifo.h | 31 ++++++++++++++++++++++++++++--- 4 files changed, 37 insertions(+), 6 deletions(-) diff --git a/doc/APIchanges b/doc/APIchanges index cfce48bfcd..a31268195f 100644 --- a/doc/APIchanges +++ b/doc/APIchanges @@ -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(). diff --git a/libavformat/dvenc.c b/libavformat/dvenc.c index 15b659bc8d..5c55338e2c 100644 --- a/libavformat/dvenc.c +++ b/libavformat/dvenc.c @@ -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 */ } diff --git a/libavutil/avutil.h b/libavutil/avutil.h index 01e4e2fb7f..484659a58b 100644 --- a/libavutil/avutil.h +++ b/libavutil/avutil.h @@ -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. diff --git a/libavutil/fifo.h b/libavutil/fifo.h index 92319616b9..961463a2a4 100644 --- a/libavutil/fifo.h +++ b/libavutil/fifo.h @@ -25,6 +25,7 @@ #define AVUTIL_FIFO_H #include +#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 */ -- cgit v1.2.3