ffmpeg | branch: master | wm4 <nfx...@googlemail.com> | Thu Jan 28 17:24:53 2016 +0100| [14a90c9ef09a4b046500dceab5ca1875e330a376] | committer: wm4
mmaldec: limit internal buffering This uses a new MMAL feature, which limits the number of extra frames that can be buffered within the decoder. VIDEO_MAX_NUM_CALLBACKS can be defined as positive or negative number. Positive numbers are absolute, and can lead to deadlocks if the user underestimates the number of required buffers. Negative numbers specify the number of extra buffers, e.g. -1 means no extra buffer, (-1-N) means N extra buffers. Set a gratuitous default of -11 (N=10). This is much lower than the firmware default, which appears to be 96. This is backwards compatible, but needs a symbol only present in newer firmware headers. (It's an enum item, so it requires a check in configure.) > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=14a90c9ef09a4b046500dceab5ca1875e330a376 --- configure | 4 ++++ libavcodec/mmaldec.c | 7 +++++++ 2 files changed, 11 insertions(+) diff --git a/configure b/configure index 60c9402..629029e 100755 --- a/configure +++ b/configure @@ -5579,6 +5579,10 @@ enabled mmal && { check_lib interface/mmal/mmal.h mmal_port_connect check_lib interface/mmal/mmal.h mmal_port_connect ; } check_lib interface/mmal/mmal.h mmal_port_connect ; } || die "ERROR: mmal not found"; } +enabled mmal && + (check_code cc interface/mmal/mmal.h "MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS" || + die "ERROR: mmal firmware headers too old") + enabled netcdf && require_pkg_config netcdf netcdf.h nc_inq_libvers enabled nvenc && { check_header nvEncodeAPI.h || die "ERROR: nvEncodeAPI.h not found."; } && { check_cpp_condition nvEncodeAPI.h "NVENCAPI_MAJOR_VERSION >= 5" || diff --git a/libavcodec/mmaldec.c b/libavcodec/mmaldec.c index ed63394..30861d9 100644 --- a/libavcodec/mmaldec.c +++ b/libavcodec/mmaldec.c @@ -66,6 +66,7 @@ typedef struct FFBufferRef { typedef struct MMALDecodeContext { AVClass *av_class; int extra_buffers; + int extra_decoder_buffers; MMAL_COMPONENT_T *decoder; MMAL_QUEUE_T *queue_decoded_frames; @@ -382,6 +383,11 @@ static av_cold int ffmmal_init_decoder(AVCodecContext *avctx) av_get_codec_tag_string(tmp, sizeof(tmp), format_in->encoding); av_log(avctx, AV_LOG_DEBUG, "Using MMAL %s encoding.\n", tmp); + if (mmal_port_parameter_set_uint32(decoder->input[0], MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS, + -1 - ctx->extra_decoder_buffers)) { + av_log(avctx, AV_LOG_WARNING, "Could not set input buffering limit.\n"); + } + if ((status = mmal_port_format_commit(decoder->input[0]))) goto fail; @@ -812,6 +818,7 @@ AVHWAccel ff_vc1_mmal_hwaccel = { static const AVOption options[]={ {"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0}, + {"extra_decoder_buffers", "extra MMAL internal buffered frames", offsetof(MMALDecodeContext, extra_decoder_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0}, {NULL} }; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
