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lavc/h264_ps: always include the stop bit in [s|p]ps->data

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The VideoToolbox hwaccel needs the entire NAL (including the stop bit),
but ff_h2645_packet_split may remove it. Detect this case by looking for
bit counts divisible by 8 and insert a stop-bit-only 0x80 byte.

Signed-off-by: rcombs <rcombs@rcombs.me>
This commit is contained in:
rcombs 2022-04-16 03:41:29 -05:00
parent 792a9f2406
commit c534d9f72a
1 changed files with 8 additions and 0 deletions
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8
libavcodec/h264_ps.c
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@ -351,6 +351,10 @@ int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
}
memcpy(sps->data, gb->buffer, sps->data_size);
// Re-add the removed stop bit (may be used by hwaccels).
if (!(gb->size_in_bits & 7) && sps->data_size < sizeof(sps->data))
sps->data[sps->data_size++] = 0x80;
profile_idc = get_bits(gb, 8);
constraint_set_flags |= get_bits1(gb) << 0; // constraint_set0_flag
constraint_set_flags |= get_bits1(gb) << 1; // constraint_set1_flag
@ -775,6 +779,10 @@ int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avct
}
memcpy(pps->data, gb->buffer, pps->data_size);
// Re-add the removed stop bit (may be used by hwaccels).
if (!(bit_length & 7) && pps->data_size < sizeof(pps->data))
pps->data[pps->data_size++] = 0x80;
pps->sps_id = get_ue_golomb_31(gb);
if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
!ps->sps_list[pps->sps_id]) {