113 строки
3.9 KiB
C++
113 строки
3.9 KiB
C++
/*
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* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "./webmenc.h"
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#include <string>
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#include "third_party/libwebm/mkvmuxer/mkvmuxer.h"
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#include "third_party/libwebm/mkvmuxer/mkvmuxerutil.h"
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#include "third_party/libwebm/mkvmuxer/mkvwriter.h"
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namespace {
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const uint64_t kDebugTrackUid = 0xDEADBEEF;
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const int kVideoTrackNumber = 1;
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} // namespace
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void write_webm_file_header(struct WebmOutputContext *webm_ctx,
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const vpx_codec_enc_cfg_t *cfg,
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const struct vpx_rational *fps,
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stereo_format_t stereo_fmt,
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unsigned int fourcc,
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const struct VpxRational *par) {
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mkvmuxer::MkvWriter *const writer = new mkvmuxer::MkvWriter(webm_ctx->stream);
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mkvmuxer::Segment *const segment = new mkvmuxer::Segment();
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segment->Init(writer);
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segment->set_mode(mkvmuxer::Segment::kFile);
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segment->OutputCues(true);
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mkvmuxer::SegmentInfo *const info = segment->GetSegmentInfo();
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const uint64_t kTimecodeScale = 1000000;
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info->set_timecode_scale(kTimecodeScale);
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std::string version = "vpxenc";
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if (!webm_ctx->debug) {
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version.append(std::string(" ") + vpx_codec_version_str());
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}
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info->set_writing_app(version.c_str());
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const uint64_t video_track_id =
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segment->AddVideoTrack(static_cast<int>(cfg->g_w),
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static_cast<int>(cfg->g_h),
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kVideoTrackNumber);
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mkvmuxer::VideoTrack* const video_track =
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static_cast<mkvmuxer::VideoTrack*>(
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segment->GetTrackByNumber(video_track_id));
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video_track->SetStereoMode(stereo_fmt);
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const char *codec_id;
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switch (fourcc) {
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case VP8_FOURCC:
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codec_id = "V_VP8";
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break;
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case VP9_FOURCC:
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codec_id = "V_VP9";
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break;
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case VP10_FOURCC:
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codec_id = "V_VP10";
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break;
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default:
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codec_id = "V_VP10";
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break;
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}
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video_track->set_codec_id(codec_id);
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if (par->numerator > 1 || par->denominator > 1) {
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// TODO(fgalligan): Add support of DisplayUnit, Display Aspect Ratio type
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// to WebM format.
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const uint64_t display_width =
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static_cast<uint64_t>(((cfg->g_w * par->numerator * 1.0) /
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par->denominator) + .5);
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video_track->set_display_width(display_width);
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video_track->set_display_height(cfg->g_h);
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}
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if (webm_ctx->debug) {
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video_track->set_uid(kDebugTrackUid);
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}
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webm_ctx->writer = writer;
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webm_ctx->segment = segment;
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}
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void write_webm_block(struct WebmOutputContext *webm_ctx,
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const vpx_codec_enc_cfg_t *cfg,
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const vpx_codec_cx_pkt_t *pkt) {
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mkvmuxer::Segment *const segment =
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reinterpret_cast<mkvmuxer::Segment*>(webm_ctx->segment);
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int64_t pts_ns = pkt->data.frame.pts * 1000000000ll *
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cfg->g_timebase.num / cfg->g_timebase.den;
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if (pts_ns <= webm_ctx->last_pts_ns)
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pts_ns = webm_ctx->last_pts_ns + 1000000;
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webm_ctx->last_pts_ns = pts_ns;
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segment->AddFrame(static_cast<uint8_t*>(pkt->data.frame.buf),
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pkt->data.frame.sz,
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kVideoTrackNumber,
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pts_ns,
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pkt->data.frame.flags & VPX_FRAME_IS_KEY);
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}
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void write_webm_file_footer(struct WebmOutputContext *webm_ctx) {
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mkvmuxer::MkvWriter *const writer =
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reinterpret_cast<mkvmuxer::MkvWriter*>(webm_ctx->writer);
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mkvmuxer::Segment *const segment =
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reinterpret_cast<mkvmuxer::Segment*>(webm_ctx->segment);
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segment->Finalize();
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delete segment;
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delete writer;
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webm_ctx->writer = NULL;
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webm_ctx->segment = NULL;
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}
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