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https://github.com/moonlight-stream/moonlight-embedded.git
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84 lines
3.5 KiB
C
84 lines
3.5 KiB
C
/*
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* This file is part of Moonlight Embedded.
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*
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* Copyright (C) 2015 Iwan Timmer
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*
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* Moonlight is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* Moonlight is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Moonlight; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sps.h"
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#include "h264_stream.h"
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static h264_stream_t* h264_stream;
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static int initial_width, initial_height;
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void gs_sps_init(int width, int height) {
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h264_stream = h264_new();
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initial_width = width;
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initial_height = height;
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}
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void gs_sps_fix(PLENTRY sps, int flags, uint8_t* out_buf, uint32_t* out_offset) {
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int start_len = sps->data[2] == 0x01 ? 3 : 4;
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read_nal_unit(h264_stream, sps->data+start_len, sps->length-start_len);
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// Some decoders rely on H264 level to decide how many buffers are needed
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// Since we only need one frame buffered, we'll set level as low as we can
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// for known resolution combinations. Otherwise leave the profile alone (currently 5.0)
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if (initial_width == 1280 && initial_height == 720)
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h264_stream->sps->level_idc = 32; // Max 5 buffered frames at 1280x720x60
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else if (initial_width == 1920 && initial_height == 1080)
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h264_stream->sps->level_idc = 42; // Max 4 buffered frames at 1920x1080x60
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// Some decoders requires a reference frame count of 1 to decode successfully.
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h264_stream->sps->num_ref_frames = 1;
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// GFE 2.5.11 changed the SPS to add additional extensions
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// Some devices don't like these so we remove them here.
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if (flags & GS_SPS_REMOVE_VST_FIXUP)
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h264_stream->sps->vui.video_signal_type_present_flag = 0;
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if (flags & GS_SPS_REMOVE_CLI_FIXUP)
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h264_stream->sps->vui.chroma_loc_info_present_flag = 0;
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if ((flags & GS_SPS_BITSTREAM_FIXUP) == GS_SPS_BITSTREAM_FIXUP) {
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// The SPS that comes in the current H264 bytestream doesn't set the bitstream_restriction_flag
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// or the max_dec_frame_buffering which increases decoding latency on some devices.
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// log2_max_mv_length_horizontal and log2_max_mv_length_vertical are set to more
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// conservative values by GFE 2.5.11. We'll let those values stand.
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if (!h264_stream->sps->vui.bitstream_restriction_flag) {
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h264_stream->sps->vui.bitstream_restriction_flag = 1;
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h264_stream->sps->vui.motion_vectors_over_pic_boundaries_flag = 1;
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h264_stream->sps->vui.max_bits_per_mb_denom = 1;
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h264_stream->sps->vui.log2_max_mv_length_horizontal = 16;
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h264_stream->sps->vui.log2_max_mv_length_vertical = 16;
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h264_stream->sps->vui.num_reorder_frames = 0;
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}
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// Some devices throw errors if max_dec_frame_buffering < num_ref_frames
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h264_stream->sps->vui.max_dec_frame_buffering = 1;
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// These values are the default for the fields, but they are more aggressive
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// than what GFE sends in 2.5.11, but it doesn't seem to cause picture problems.
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h264_stream->sps->vui.max_bytes_per_pic_denom = 2;
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h264_stream->sps->vui.max_bits_per_mb_denom = 1;
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}
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memcpy(out_buf+*out_offset, sps->data, start_len);
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*out_offset += start_len;
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*out_offset += write_nal_unit(h264_stream, out_buf+*out_offset, 128);
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}
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