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Write the original H.264 SPS if it required no fixups

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This commit is contained in:
Cameron Gutman
2026-07-26 18:33:28 -05:00
parent 490229be3f
commit 2fc0d84aa0
1 changed files with 34 additions and 25 deletions
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app/streaming/video/ffmpeg.cpp
+34 -25
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@@ -1781,33 +1781,42 @@ void FFmpegVideoDecoder::writeBuffer(PLENTRY entry, int& offset)
// Fixup the SPS to what OS X needs to use hardware acceleration
// This is also critical for decoding latency on the Pi 2.
stream->sps->num_ref_frames = 1;
stream->sps->vui.max_dec_frame_buffering = 1;
if (stream->sps->num_ref_frames != 1 || stream->sps->vui.max_dec_frame_buffering != 1) {
stream->sps->num_ref_frames = 1;
stream->sps->vui.max_dec_frame_buffering = 1;
// NVENC doesn't seem to add bitstream restrictions anymore (591.59),
// so we need to add them ourselves if not present to ensure that
// the max_dec_frame_buffering option actually takes effect.
// We use the defaults for everything except max_dec_frame_buffering.
if (!stream->sps->vui.bitstream_restriction_flag) {
stream->sps->vui.bitstream_restriction_flag = 1;
stream->sps->vui.motion_vectors_over_pic_boundaries_flag = 1;
stream->sps->vui.max_bytes_per_pic_denom = 2;
stream->sps->vui.max_bits_per_mb_denom = 1;
stream->sps->vui.log2_max_mv_length_horizontal = 16;
stream->sps->vui.log2_max_mv_length_vertical = 16;
stream->sps->vui.num_reorder_frames = 0;
// NVENC doesn't seem to add bitstream restrictions anymore (591.59),
// so we need to add them ourselves if not present to ensure that
// the max_dec_frame_buffering option actually takes effect.
// We use the defaults for everything except max_dec_frame_buffering.
if (!stream->sps->vui.bitstream_restriction_flag) {
stream->sps->vui.bitstream_restriction_flag = 1;
stream->sps->vui.motion_vectors_over_pic_boundaries_flag = 1;
stream->sps->vui.max_bytes_per_pic_denom = 2;
stream->sps->vui.max_bits_per_mb_denom = 1;
stream->sps->vui.log2_max_mv_length_horizontal = 16;
stream->sps->vui.log2_max_mv_length_vertical = 16;
stream->sps->vui.num_reorder_frames = 0;
}
int initialOffset = offset;
// Copy the modified NALU data. This clobbers byte 0 and starts NALU data at byte 1.
// Since it prepended one extra byte, subtract one from the returned length.
offset += write_nal_unit(stream, (uint8_t*)&m_DecodeBuffer.data()[initialOffset + nalStart - 1],
MAX_SPS_EXTRA_SIZE + entry->length - nalStart) - 1;
// Copy the NALU prefix over from the original SPS
memcpy(&m_DecodeBuffer.data()[initialOffset], entry->data, nalStart);
offset += nalStart;
}
else {
// Write the SPS as-is if it required no modification
memcpy(&m_DecodeBuffer.data()[offset],
entry->data,
entry->length);
offset += entry->length;
}
int initialOffset = offset;
// Copy the modified NALU data. This clobbers byte 0 and starts NALU data at byte 1.
// Since it prepended one extra byte, subtract one from the returned length.
offset += write_nal_unit(stream, (uint8_t*)&m_DecodeBuffer.data()[initialOffset + nalStart - 1],
MAX_SPS_EXTRA_SIZE + entry->length - nalStart) - 1;
// Copy the NALU prefix over from the original SPS
memcpy(&m_DecodeBuffer.data()[initialOffset], entry->data, nalStart);
offset += nalStart;
h264_free(stream);
}