On 28/04/17 10:00, Anton Khirnov wrote:
> Quoting Mark Thompson (2017-04-23 21:21:02)
>> This only supports one device globally, but more can be used by
>> passing them with input streams in hw_frames_ctx or by deriving new
>> devices inside a filter graph with hwmap.
>> ---
>> Added doc.
>>
>>
>> avtools/avconv.h | 1 +
>> avtools/avconv_filter.c | 10 ++++++++--
>> avtools/avconv_opt.c | 21 +++++++++++++++++++++
>> doc/avconv.texi | 11 +++++++++++
>> 4 files changed, 41 insertions(+), 2 deletions(-)
>>
>> diff --git a/avtools/avconv.h b/avtools/avconv.h
>> index 9415b208b..3354c5044 100644
>> --- a/avtools/avconv.h
>> +++ b/avtools/avconv.h
>> @@ -489,6 +489,7 @@ extern const OptionDef options[];
>> extern const HWAccel hwaccels[];
>> extern int hwaccel_lax_profile_check;
>> extern AVBufferRef *hw_device_ctx;
>> +extern HWDevice *filter_hw_device;
>>
>> void reset_options(OptionsContext *o);
>> void show_usage(void);
>> diff --git a/avtools/avconv_filter.c b/avtools/avconv_filter.c
>> index e53dcd271..884478da2 100644
>> --- a/avtools/avconv_filter.c
>> +++ b/avtools/avconv_filter.c
>> @@ -711,9 +711,15 @@ int configure_filtergraph(FilterGraph *fg)
>> if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs,
>> &outputs)) < 0)
>> goto fail;
>>
>> - if (hw_device_ctx) {
>> + if (filter_hw_device || hw_device_ctx) {
>> + AVBufferRef *device = filter_hw_device ?
>> filter_hw_device->device_ref
>> + : hw_device_ctx;
>> for (i = 0; i < fg->graph->nb_filters; i++) {
>> - fg->graph->filters[i]->hw_device_ctx =
>> av_buffer_ref(hw_device_ctx);
>> + fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(device);
>> + if (!fg->graph->filters[i]->hw_device_ctx) {
>> + ret = AVERROR(ENOMEM);
>> + goto fail;
>> + }
>> }
>> }
>>
>> diff --git a/avtools/avconv_opt.c b/avtools/avconv_opt.c
>> index e970c8e46..cdc980870 100644
>> --- a/avtools/avconv_opt.c
>> +++ b/avtools/avconv_opt.c
>> @@ -80,6 +80,7 @@ const HWAccel hwaccels[] = {
>> };
>> int hwaccel_lax_profile_check = 0;
>> AVBufferRef *hw_device_ctx;
>> +HWDevice *filter_hw_device;
>>
>> char *vstats_filename;
>>
>> @@ -369,6 +370,24 @@ static int opt_init_hw_device(void *optctx, const char
>> *opt, const char *arg)
>> }
>> }
>>
>> +static int opt_filter_hw_device(void *optctx, const char *opt, const char
>> *arg)
>> +{
>> + int err;
>> + if (filter_hw_device) {
>> + av_log(NULL, AV_LOG_ERROR, "Only one filter device can be used.\n");
>> + return AVERROR(EINVAL);
>> + }
>> + filter_hw_device = hw_device_get_by_name(arg);
>> + if (!filter_hw_device) {
>> + err = hw_device_init_from_string(arg, &filter_hw_device);
>
> Do we really want this fallback? Seems to me this might cause more
> confusion since now stuff depends on the ordering of -filter_hw_device
> and -init_hw_device
Maybe not. I had it so that you don't need to supply two options when making
just one device (i.e. "-filter_hw_device foo -vf hwupload..."), but I agree
it's redundant.
>> diff --git a/doc/avconv.texi b/doc/avconv.texi
>> index 7bcb78797..2837e30f3 100644
>> --- a/doc/avconv.texi
>> +++ b/doc/avconv.texi
>> @@ -644,6 +644,17 @@ deriving it from the existing device with the name
>> @var{source}.
>> @item -init_hw_device list
>> List all hardware device types supported in this build of avconv.
>>
>> +@item -filter_hw_device @var{name}
>> +Pass the hardware device called @var{name} to all filters in any filter
>> graph.
>> +This can be used to set the device to upload to with the @code{hwupload}
>> filter,
>> +or the device to map to with the @code{hwmap} filter. Other filters may
>> also
>> +make use of this parameter when they require a hardware device. Note that
>> this
>> +is typically only required when the input is not already in hardware frames
>> -
>> +when it is, filters will derive the device they require from the context of
>> the
>> +frames they receive as input.
>> +
>> +This is a global setting, so all filters will receive the same device.
>> +
>
> Maybe mention that this is a (hopefully) temporary thing and people
> shouldn't rely on this option in scripts and such.
Not really sure how to express that sentiment for documentation.
"Note that this option is temporarily available to support a single device in
filter graphs, applying to every filter. It is intended to be replaced by a
more complete specification allowing multiple devices, and will be removed when
that is introduced."
?
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