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Makes it possible to benchmark the different code paths individually.

Alternate between buffers when benchmarking in order to more
accurately measure throughout instead of latency.

Additionally, switch from 'only'/'except' to 'rules' which is
more flexible.

* Doxygen had a longstanding bug [0] where it would use `dot` even if
  not configured to do so. Due to this behaviour our config magically
  worked.
  This bug is fixed in 1.9.2 therefore we need to explicitly enable
  `dot` support in order to keep existing functionality.

* Enables WARN_AS_ERROR to catch mistakes.

* Adds a version string to the header to easily identify which commit
  the docs are built from.

[0] https://github.com/doxygen/doxygen/issues/7273

Increasing a reference counter only requires atomicity, but not
ordering or synchronization.

Checking if the Dav1dRef pointer is non-zero and zeroing it is
already performed in dav1d_ref_dec(), no need to do it twice.

Also reorder code to enable tail call elimination.

Avoids the function call overhead in non-LTO builds.

Also reorder code in dav1d_ref_dec() to enable tail call elimination.

inv_txfm_add_32x8_dct_dct_0_12bpc_c: 286.7
inv_txfm_add_32x8_dct_dct_0_12bpc_avx2: 20.1
inv_txfm_add_32x8_dct_dct_1_12bpc_c: 7832.7
inv_txfm_add_32x8_dct_dct_1_12bpc_avx2: 710.6
inv_txfm_add_32x8_dct_dct_2_12bpc_c: 7838.1
inv_txfm_add_32x8_dct_dct_2_12bpc_avx2: 711.6
inv_txfm_add_32x8_dct_dct_3_12bpc_c: 7818.3
inv_txfm_add_32x8_dct_dct_3_12bpc_avx2: 710.9
inv_txfm_add_32x8_dct_dct_4_12bpc_c: 7820.6
inv_txfm_add_32x8_dct_dct_4_12bpc_avx2: 710.5
inv_txfm_add_32x8_identity_identity_0_12bpc_c: 1526.6
inv_txfm_add_32x8_identity_identity_0_12bpc_avx2: 19.3
inv_txfm_add_32x8_identity_identity_1_12bpc_c: 1519.4
inv_txfm_add_32x8_identity_identity_1_12bpc_avx2: 19.9
inv_txfm_add_32x8_identity_identity_2_12bpc_c: 1519.9
inv_txfm_add_32x8_identity_identity_2_12bpc_avx2: 43.6
inv_txfm_add_32x8_identity_identity_3_12bpc_c: 1519.4
inv_txfm_add_32x8_identity_identity_3_12bpc_avx2: 67.8
inv_txfm_add_32x8_identity_identity_4_12bpc_c: 1523.2
inv_txfm_add_32x8_identity_identity_4_12bpc_avx2: 91.6

inv_txfm_add_8x32_dct_dct_0_12bpc_c: 334.6
inv_txfm_add_8x32_dct_dct_0_12bpc_avx2: 66.0
inv_txfm_add_8x32_dct_dct_1_12bpc_c: 7929.7
inv_txfm_add_8x32_dct_dct_1_12bpc_avx2: 489.3
inv_txfm_add_8x32_dct_dct_2_12bpc_c: 7925.8
inv_txfm_add_8x32_dct_dct_2_12bpc_avx2: 547.1
inv_txfm_add_8x32_dct_dct_3_12bpc_c: 7928.9
inv_txfm_add_8x32_dct_dct_3_12bpc_avx2: 647.8
inv_txfm_add_8x32_dct_dct_4_12bpc_c: 7916.1
inv_txfm_add_8x32_dct_dct_4_12bpc_avx2: 701.0
inv_txfm_add_8x32_identity_identity_0_12bpc_c: 2413.1
inv_txfm_add_8x32_identity_identity_0_12bpc_avx2: 28.6
inv_txfm_add_8x32_identity_identity_1_12bpc_c: 2415.2
inv_txfm_add_8x32_identity_identity_1_12bpc_avx2: 28.6
inv_txfm_add_8x32_identity_identity_2_12bpc_c: 2413.7
inv_txfm_add_8x32_identity_identity_2_12bpc_avx2: 55.1
inv_txfm_add_8x32_identity_identity_3_12bpc_c: 2415.4
inv_txfm_add_8x32_identity_identity_3_12bpc_avx2: 85.3
inv_txfm_add_8x32_identity_identity_4_12bpc_c: 2401.8
inv_txfm_add_8x32_identity_identity_4_12bpc_avx2: 116.8

From section 6.8.2 in the AV1 spec:

"It is a requirement of bitstream conformance that when show_existing_frame is
used to show a previous frame with RefFrameType[ frame_to_show_map_idx ] equal
to KEY_FRAME, that the frame is output via the show_existing_frame mechanism at
most once."

From section 6.8.2 in the AV1 spec:

"It is a requirement of bitstream conformance that when show_existing_frame
is used to show a previous frame, that the value of showable_frame for the
previous frame was equal to 1."

From section 6.8.2 in the AV1 spec:

"If frame_type is equal to INTRA_ONLY_FRAME, it is a requirement of bitstream
conformance that refresh_frame_flags is not equal to 0xff."

Make this a soft requirement by checking that strict standard complaince is
enabled.

Steve Lhomme authored Mar 29, 2022 and James Almer committed Apr 08, 2022

There's an assert on n_fc == 1 at the beginning of the function. There cannot
be a second pass used here.
Signed-off-by: Steve Lhomme <robux4@videolabs.io>

picture: ensure the new seq header and op param info flags are attached to the next visible picture in display order

If the first picture in coding order after a new sequence header is parsed is
not visible, the first picture output by dav1d after the fact (which is coded
after the aforementioned invisible picture) would not trigger the new seq
header event flag as expected, despite being the first containing a reference
to a new sequence header.

Assuming the invisible picture is ever output, the result of this change will
be two pictures signaling a new sequence header was seen despite there being
only one new sequence header.

Wan-Teh Chang authored Mar 09, 2022 and James Almer committed Mar 16, 2022

Set f->n_tile_data to 0 after the dav1d_decode_frame_exit() call in
dav1d_decode_frame(). dav1d_decode_frame_exit() unrefs every element in
use in the f->tile array, so it is good to set f->n_tile_data to 0 to
indicate that no elements are in use.

We are already doing this after all other dav1d_decode_frame_exit()
calls.

NOTE: It is tempting to have dav1d_decode_frame_exit() itself set
f->n_tile_data to 0. I did not do that in this merge request, because
the following is a common pattern:

    dav1d_decode_frame_exit(f, error);
    f->n_tile_data = 0;
    pthread_cond_signal(&f->task_thread.cond);

corresponding to the waiting code:

    while (f->n_tile_data > 0)
        pthread_cond_wait(&f->task_thread.cond,
                          &c->task_thread.lock);

I wonder if f->n_tile_data is set to 0 outside dav1d_decode_frame_exit()
to make clear the association of f->n_tile_data with the condition
variable f->task_thread.cond.

Split out common parts into separate functions. This reduces the
overall binary size by more than 5 KiB.

Martin Storsjö authored Mar 09, 2022 and Jean-Baptiste Kempf committed Mar 10, 2022

This avoids build errors if such features are enabled while targeting
another binary format. (Using such features on other platforms
might require some other form of signaling/setup though, but
the ELF specific .note section isn't applicable at least.)

Fixes #277.

This clears stale values from the context in the scenario where you first parse
a svc sequence, and then a sequence header with the reduced still picture
header flag being true immediately after it.

Fixes #390.