Useful in cases where a significant analyzeduration is still needed, while minimizing buffering before output. An example is processing low-latency streams where all media types won't necessarily come in if the analyzeduration is small. Additional changes by Josh Allmann <joshua.allmann@gmail.com>
Unified · Split
| @@ -13,6 +13,9 @@ libavutil: 2011-04-18 · 12 unmodified lines | ||
| 13 | 13 | |
| 14 | 14 | API changes, most recent first: |
| 15 | 15 | |
| 16 | +2012-07-xx - xxxxxxx - lavf 54.13.0 - avformat.h | |
| 17 | + Add AVFMT_FLAG_NOBUFFER for low latency use cases. | |
| 18 | + | |
| 16 | 19 | 2012-07-xx - xxxxxxx - lavfi 3.0.0 - avfilter.h |
| 17 | 20 | Add avfilter_unref_bufferp(). |
| 18 | 21 | |
| @@ -887,6 +887,7 @@ typedef struct AVFormatContext { · 886 unmodified lines | ||
| 887 | 887 | #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS |
| 888 | 888 | #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container |
| 889 | 889 | #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 |
| 890 | +#define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible | |
| 890 | 891 | #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it. |
| 891 | 892 | #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted |
| 892 | 893 | |
| @@ -40,6 +40,7 @@ static const AVOption options[]={ · 39 unmodified lines | ||
| 40 | 40 | {"noparse", "disable AVParsers, this needs nofillin too", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOPARSE }, INT_MIN, INT_MAX, D, "fflags"}, |
| 41 | 41 | {"igndts", "ignore dts", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNDTS }, INT_MIN, INT_MAX, D, "fflags"}, |
| 42 | 42 | {"discardcorrupt", "discard corrupted frames", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_DISCARD_CORRUPT }, INT_MIN, INT_MAX, D, "fflags"}, |
| 43 | +{"nobuffer", "reduce the latency introduced by optional buffering", 0, AV_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOBUFFER }, 0, INT_MAX, D, "fflags"}, | |
| 43 | 44 | {"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}, |
| 44 | 45 | {"cryptokey", "decryption key", OFFSET(key), AV_OPT_TYPE_BINARY, {.dbl = 0}, 0, 0, D}, |
| 45 | 46 | {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), AV_OPT_TYPE_INT, {.dbl = 1<<20 }, 0, INT_MAX, D}, |
| @@ -2383,9 +2383,14 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options) · 2382 unmodified lines | ||
| 2383 | 2383 | break; |
| 2384 | 2384 | } |
| 2385 | 2385 | |
| 2386 | − pkt= add_to_pktbuf(&ic->packet_buffer, &pkt1, &ic->packet_buffer_end); | |
| 2387 | − if ((ret = av_dup_packet(pkt)) < 0) | |
| 2388 | − goto find_stream_info_err; | |
| 2386 | + if (ic->flags & AVFMT_FLAG_NOBUFFER) { | |
| 2387 | + pkt = &pkt1; | |
| 2388 | + } else { | |
| 2389 | + pkt = add_to_pktbuf(&ic->packet_buffer, &pkt1, | |
| 2390 | + &ic->packet_buffer_end); | |
| 2391 | + if ((ret = av_dup_packet(pkt)) < 0) | |
| 2392 | + goto find_stream_info_err; | |
| 2393 | + } | |
| 2389 | 2394 | |
| 2390 | 2395 | read_size += pkt->size; |
| 2391 | 2396 | |
| @@ -30,8 +30,8 @@ · 29 unmodified lines | ||
| 30 | 30 | #include "libavutil/avutil.h" |
| 31 | 31 | |
| 32 | 32 | #define LIBAVFORMAT_VERSION_MAJOR 54 |
| 33 | −#define LIBAVFORMAT_VERSION_MINOR 12 | |
| 34 | −#define LIBAVFORMAT_VERSION_MICRO 1 | |
| 33 | +#define LIBAVFORMAT_VERSION_MINOR 13 | |
| 34 | +#define LIBAVFORMAT_VERSION_MICRO 0 | |
| 35 | 35 | |
| 36 | 36 | #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ |
| 37 | 37 | LIBAVFORMAT_VERSION_MINOR, \ |