diff --git a/doc/APIchanges b/doc/APIchanges index 8770b6d570..058fab6334 100644 --- a/doc/APIchanges +++ b/doc/APIchanges @@ -13,6 +13,9 @@ libavutil: 2011-04-18 API changes, most recent first: +2012-07-xx - xxxxxxx - lavf 54.13.0 - avformat.h + Add AVFMT_FLAG_NOBUFFER for low latency use cases. + 2012-07-xx - xxxxxxx - lavfi 3.0.0 - avfilter.h Add avfilter_unref_bufferp(). diff --git a/libavformat/avformat.h b/libavformat/avformat.h index e292206c60..7c97ada2c8 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -887,6 +887,7 @@ typedef struct AVFormatContext { #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container #define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled +#define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it. #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted diff --git a/libavformat/options_table.h b/libavformat/options_table.h index 58f3dcff68..f3384cab25 100644 --- a/libavformat/options_table.h +++ b/libavformat/options_table.h @@ -40,6 +40,7 @@ static const AVOption options[]={ {"noparse", "disable AVParsers, this needs nofillin too", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOPARSE }, INT_MIN, INT_MAX, D, "fflags"}, {"igndts", "ignore dts", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNDTS }, INT_MIN, INT_MAX, D, "fflags"}, {"discardcorrupt", "discard corrupted frames", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_DISCARD_CORRUPT }, INT_MIN, INT_MAX, D, "fflags"}, +{"nobuffer", "reduce the latency introduced by optional buffering", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOBUFFER }, 0, INT_MAX, D, "fflags"}, {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), AV_OPT_TYPE_INT, {.dbl = 5*AV_TIME_BASE }, 0, INT_MAX, D}, {"cryptokey", "decryption key", OFFSET(key), AV_OPT_TYPE_BINARY, {.dbl = 0}, 0, 0, D}, {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), AV_OPT_TYPE_INT, {.dbl = 1<<20 }, 0, INT_MAX, D}, diff --git a/libavformat/utils.c b/libavformat/utils.c index 4ec70b7f51..149913cb04 100644 --- a/libavformat/utils.c +++ b/libavformat/utils.c @@ -2383,9 +2383,14 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options) break; } - pkt= add_to_pktbuf(&ic->packet_buffer, &pkt1, &ic->packet_buffer_end); - if ((ret = av_dup_packet(pkt)) < 0) - goto find_stream_info_err; + if (ic->flags & AVFMT_FLAG_NOBUFFER) { + pkt = &pkt1; + } else { + pkt = add_to_pktbuf(&ic->packet_buffer, &pkt1, + &ic->packet_buffer_end); + if ((ret = av_dup_packet(pkt)) < 0) + goto find_stream_info_err; + } read_size += pkt->size; diff --git a/libavformat/version.h b/libavformat/version.h index de6da526c3..6b7ada8496 100644 --- a/libavformat/version.h +++ b/libavformat/version.h @@ -30,8 +30,8 @@ #include "libavutil/avutil.h" #define LIBAVFORMAT_VERSION_MAJOR 54 -#define LIBAVFORMAT_VERSION_MINOR 12 -#define LIBAVFORMAT_VERSION_MICRO 1 +#define LIBAVFORMAT_VERSION_MINOR 13 +#define LIBAVFORMAT_VERSION_MICRO 0 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ LIBAVFORMAT_VERSION_MINOR, \