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Add session metadata for video stream

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Introduce a new packet type, a "session" packet, containing metadata
about the encoding session. It is used only for the video stream,
and currently includes the video resolution.

For illustration, here is a sequence of packets on the video stream:

                                        device rotation
                                        v
    CODEC | SESSION | MEDIA | MEDIA | … | SESSION | MEDIA | MEDIA | …
           1920x1080 <-----------------> 1080x1920 <------------------
                      encoding session 1            encoding session 2

This metadata is not strictly necessary, since the video resolution can
be determined after decoding. However, it allows detection of cases
where the encoder does not respect the requested size (and logs a
warning), even without decoding (e.g., when there is no video playback).

Additional metadata could be added later if necessary, for example the
actual device rotation.

Refs #5918 <https://github.com/Genymobile/scrcpy/pull/5918>
Refs #5894 <https://github.com/Genymobile/scrcpy/pull/5894>

Co-authored-by: gz0119 <liyong2@4399.com>
This commit is contained in:
Romain Vimont
2025-05-10 10:23:02 +02:00
parent 0b4c94056c
commit 00e4800b0c
15 changed files with 240 additions and 82 deletions
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4
app/src/screen.c
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@@ -228,9 +228,11 @@ event_watcher(void *data, SDL_Event *event) {
static bool
sc_screen_frame_sink_open(struct sc_frame_sink *sink,
const AVCodecContext *ctx) {
const AVCodecContext *ctx,
const struct sc_stream_session *session) {
assert(ctx->pix_fmt == AV_PIX_FMT_YUV420P);
(void) ctx;
(void) session;
struct sc_screen *screen = DOWNCAST(sink);
(void) screen;