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v4l2: allow negotiation with modifier

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This assumes that the modifier is always 'linear'. That is not quite
correct for all V4L2 formats. But PipeWire only uses input devices and
other modifiers are very unlikely.

This makes it possible to use DMABUFs with the GStreamer pipewiresrc.
This commit is contained in:
Michael Olbrich 2024-11-26 16:58:57 +01:00 • committed by Wim Taymans
parent 1541ce3368
commit 17c755714d
2 changed files with 36 additions and 1 deletions
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29
spa/plugins/v4l2/v4l2-utils.c
View file

@ -513,11 +513,12 @@ spa_v4l2_enum_format(struct impl *this, int seq,
struct spa_pod_frame f[2];
struct spa_result_node_params result;
uint32_t count = 0;
bool with_modifier;
if ((res = spa_v4l2_open(dev, this->props.device)) < 0)
return res;
spa_pod_dynamic_builder_init(&b, buffer, sizeof(buffer), 4096);
spa_pod_dynamic_builder_init(&b, buffer, sizeof(buffer), 8192);
spa_pod_builder_get_state(&b.b, &state);
result.id = SPA_PARAM_EnumFormat;
@ -537,6 +538,7 @@ spa_v4l2_enum_format(struct impl *this, int seq,
if ((res = spa_format_parse(filter, &filter_media_type, &filter_media_subtype)) < 0)
return res;
}
with_modifier = !filter || spa_pod_find_prop(filter, NULL, SPA_FORMAT_VIDEO_modifier);
if (false) {
next_fmtdesc:
@ -729,6 +731,10 @@ do_frmsize_filter:
if (info->media_subtype == SPA_MEDIA_SUBTYPE_raw) {
spa_pod_builder_prop(&b.b, SPA_FORMAT_VIDEO_format, 0);
spa_pod_builder_id(&b.b, info->format);
if (with_modifier) {
spa_pod_builder_prop(&b.b, SPA_FORMAT_VIDEO_modifier, SPA_POD_PROP_FLAG_MANDATORY);
spa_pod_builder_long(&b.b, 0L);
}
}
spa_pod_builder_prop(&b.b, SPA_FORMAT_VIDEO_size, 0);
@ -899,6 +905,27 @@ do_frminterval_filter:
spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
if (++count == num)
goto enum_end;
if (with_modifier && info->media_subtype == SPA_MEDIA_SUBTYPE_raw) {
struct spa_pod_object *op = (struct spa_pod_object *) result.param;
const struct spa_pod_prop *p;
bool drop_next = false;
spa_pod_builder_push_object(&b.b, &f[0], op->body.type, op->body.id);
SPA_POD_OBJECT_FOREACH(op, p) {
if (p->key != SPA_FORMAT_VIDEO_modifier)
spa_pod_builder_raw_padded(&b.b, p, SPA_POD_PROP_SIZE(p));
}
result.index = result.next++;
result.param = spa_pod_builder_pop(&b.b, &f[0]);
spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
}
if (++count != num)
goto next;