mirror of https://github.com/odrling/Aegisub
Document the Y4M video provider.
Originally committed to SVN as r3376.
This commit is contained in:
Karl Blomster
parent
c6c99a1fe6
commit
1a182098fc
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@ -42,20 +42,15 @@
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// (yes, really)
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// With cstdio it's at least possible to work around the problem...
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#ifdef _MSC_VER
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/// DOCME
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#define fseeko _fseeki64
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/// DOCME
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#define ftello _ftelli64
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#endif
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/// @brief DOCME
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/// @param filename
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///
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/// @brief Constructor
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/// @param filename The filename to open
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YUV4MPEGVideoProvider::YUV4MPEGVideoProvider(wxString filename) {
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sf = NULL;
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w = 0;
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@ -86,18 +81,14 @@ YUV4MPEGVideoProvider::YUV4MPEGVideoProvider(wxString filename) {
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}
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/// @brief DOCME
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///
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/// @brief Destructor
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YUV4MPEGVideoProvider::~YUV4MPEGVideoProvider() {
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Close();
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}
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/// @brief DOCME
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/// @param _filename
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///
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/// @brief Open a video file
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/// @param _filename The video file to open
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void YUV4MPEGVideoProvider::LoadVideo(const wxString _filename) {
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Close();
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@ -128,17 +119,19 @@ void YUV4MPEGVideoProvider::LoadVideo(const wxString _filename) {
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if (imode == Y4M_ILACE_NOTSET)
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imode = Y4M_ILACE_UNKNOWN;
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luma_sz = w * h;
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switch (pixfmt) {
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case Y4M_PIXFMT_420JPEG:
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case Y4M_PIXFMT_420MPEG2:
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case Y4M_PIXFMT_420PALDV:
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frame_sz = (w * h * 3) / 2; break;
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chroma_sz = (w * h) / 2; break;
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case Y4M_PIXFMT_422:
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frame_sz = (w * h * 2); break;
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// TODO: add support for more pixel formats
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chroma_sz = (w / 2) * h; break; // should be safe to assume that width is mod2
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/// @todo add support for more pixel formats
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default:
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throw wxString(_T("Unsupported colorspace"));
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throw wxString(_T("Unsupported pixel format"));
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}
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frame_sz = luma_sz + chroma_sz*2;
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num_frames = IndexFile();
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if (num_frames <= 0 || seek_table.empty())
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@ -149,9 +142,7 @@ void YUV4MPEGVideoProvider::LoadVideo(const wxString _filename) {
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}
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/// @brief DOCME
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///
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/// @brief Closes the currently open file (if any) and resets reader state
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void YUV4MPEGVideoProvider::Close() {
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seek_table.clear();
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if (sf)
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@ -160,10 +151,9 @@ void YUV4MPEGVideoProvider::Close() {
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}
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/// @brief verify that the file is actually a YUV4MPEG file
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/// @return
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///
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/// @brief Checks if the file is an YUV4MPEG file or not
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/// Note that it reports the error by throwing an exception,
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/// not by returning a false value.
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void YUV4MPEGVideoProvider::CheckFileFormat() {
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char buf[10];
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if (fread(buf, 10, 1, sf) != 1)
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@ -175,12 +165,10 @@ void YUV4MPEGVideoProvider::CheckFileFormat() {
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}
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/// @brief read a frame or file header and return a list of its parameters
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/// @param startpos
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/// @param reset_pos
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/// @return
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///
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/// @brief Read a frame or file header at a given file position
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/// @param startpos The byte offset at where to start reading
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/// @param reset_pos If true, the function will reset the file position to what it was before the function call before returning
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/// @return A list of parameters
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std::vector<wxString> YUV4MPEGVideoProvider::ReadHeader(int64_t startpos, bool reset_pos) {
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int64_t oldpos = ftello(sf);
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std::vector<wxString> tags;
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@ -230,10 +218,8 @@ std::vector<wxString> YUV4MPEGVideoProvider::ReadHeader(int64_t startpos, bool r
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}
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/// @brief parse a file header and set file properties
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/// @param tags
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///
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/// @brief Parses a list of parameters and sets reader state accordingly
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/// @param tags The list of parameters to parse
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void YUV4MPEGVideoProvider::ParseFileHeader(const std::vector<wxString>& tags) {
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if (tags.size() <= 1)
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throw wxString(_T("ParseFileHeader: contentless header"));
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@ -318,32 +304,32 @@ void YUV4MPEGVideoProvider::ParseFileHeader(const std::vector<wxString>& tags) {
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h = t_h;
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fps_rat.num = t_fps_num;
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fps_rat.den = t_fps_den;
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pixfmt = t_pixfmt != Y4M_PIXFMT_NONE ? t_pixfmt : Y4M_PIXFMT_420JPEG;
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imode = t_imode != Y4M_ILACE_NOTSET ? t_imode : Y4M_ILACE_UNKNOWN;
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pixfmt = t_pixfmt != Y4M_PIXFMT_NONE ? t_pixfmt : Y4M_PIXFMT_420JPEG;
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imode = t_imode != Y4M_ILACE_NOTSET ? t_imode : Y4M_ILACE_UNKNOWN;
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inited = true;
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}
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}
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/// @brief parse a frame header (currently unused)
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/// @param tags
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/// @return
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///
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/// @brief Parses a frame header
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/// @param tags The list of parameters to parse
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/// @return The flags set, as a binary mask
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/// This function is currently unimplemented (it will always return Y4M_FFLAG_NONE).
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YUV4MPEGVideoProvider::Y4M_FrameFlags YUV4MPEGVideoProvider::ParseFrameHeader(const std::vector<wxString>& tags) {
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if (tags.front().Cmp(_("FRAME")))
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throw wxString(_T("ParseFrameHeader: malformed frame header (bad magic)"));
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// TODO: implement parsing of rff flags etc
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/// @todo implement parsing of frame flags
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return Y4M_FFLAG_NONE;
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}
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/// @brief index the file, i.e. find all frames and their flags
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/// @return
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///
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/// @brief Indexes the file
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/// @return The number of frames found in the file
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/// This function goes through the file, finds and parses all file and frame headers,
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/// and creates a seek table that lists the byte positions of all frames so seeking
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/// can easily be done.
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int YUV4MPEGVideoProvider::IndexFile() {
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int framecount = 0;
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int64_t curpos = ftello(sf);
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@ -375,7 +361,7 @@ int YUV4MPEGVideoProvider::IndexFile() {
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throw wxString::Format(_T("IndexFile: failed seeking to position %d"), curpos + frame_sz);
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}
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else {
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// TODO: implement this
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/// @todo implement rff flags etc
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}
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}
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@ -384,10 +370,9 @@ int YUV4MPEGVideoProvider::IndexFile() {
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/// @brief DOCME
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/// @param n
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/// @return
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///
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/// @brief Gets a given frame
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/// @param n The frame number to return
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/// @return The video frame
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const AegiVideoFrame YUV4MPEGVideoProvider::GetFrame(int n) {
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// don't try to seek to insane places
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if (n < 0)
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@ -399,15 +384,15 @@ const AegiVideoFrame YUV4MPEGVideoProvider::GetFrame(int n) {
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VideoFrameFormat src_fmt, dst_fmt;
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dst_fmt = FORMAT_RGB32;
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int uv_width, uv_height;
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int uv_width;
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switch (pixfmt) {
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case Y4M_PIXFMT_420JPEG:
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case Y4M_PIXFMT_420MPEG2:
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case Y4M_PIXFMT_420PALDV:
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src_fmt = FORMAT_YV12; uv_width = w / 2; uv_height = h / 2; break;
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src_fmt = FORMAT_YV12; uv_width = w / 2; break;
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case Y4M_PIXFMT_422:
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src_fmt = FORMAT_YUY2; uv_width = w / 2; uv_height = h; break;
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// TODO: add support for more pixel formats
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src_fmt = FORMAT_YUY2; uv_width = w / 2; break;
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/// @todo add support for more pixel formats
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default:
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throw wxString(_T("YUV4MPEG video provider: GetFrame: Unsupported source colorspace"));
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}
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@ -419,16 +404,17 @@ const AegiVideoFrame YUV4MPEGVideoProvider::GetFrame(int n) {
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tmp_frame.h = h;
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tmp_frame.invertChannels = false;
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tmp_frame.pitch[0] = w;
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for (int i=1;i<=2;i++) tmp_frame.pitch[i] = uv_width;
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for (int i=1;i<=2;i++)
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tmp_frame.pitch[i] = uv_width;
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tmp_frame.Allocate();
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fseeko(sf, seek_table[n], SEEK_SET);
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size_t ret;
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ret = fread(tmp_frame.data[0], w * h, 1, sf);
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ret = fread(tmp_frame.data[0], luma_sz, 1, sf);
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if (ret != 1 || feof(sf) || ferror(sf))
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throw wxString(_T("YUV4MPEG video provider: GetFrame: failed to read luma plane"));
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for (int i = 1; i <= 2; i++) {
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ret = fread(tmp_frame.data[i], uv_width * uv_height, 1, sf);
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ret = fread(tmp_frame.data[i], chroma_sz, 1, sf);
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if (ret != 1 || feof(sf) || ferror(sf))
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throw wxString(_T("YUV4MPEG video provider: GetFrame: failed to read chroma planes"));
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}
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/// @brief Utility functions
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/// @return
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///
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// Utility functions
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int YUV4MPEGVideoProvider::GetWidth() {
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return w;
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}
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/// @brief DOCME
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/// @return
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///
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int YUV4MPEGVideoProvider::GetHeight() {
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return h;
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}
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/// @brief DOCME
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/// @return
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///
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int YUV4MPEGVideoProvider::GetFrameCount() {
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return num_frames;
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}
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/// @brief DOCME
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/// @return
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///
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int YUV4MPEGVideoProvider::GetPosition() {
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return cur_fn;
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}
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/// @brief DOCME
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///
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double YUV4MPEGVideoProvider::GetFPS() {
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return double(fps_rat.num) / double(fps_rat.den);
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}
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@ -45,163 +45,95 @@
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#include <vector>
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/// DOCME
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/// the maximum allowed header length, in bytes
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#define YUV4MPEG_HEADER_MAXLEN 128
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/// @class YUV4MPEGVideoProvider
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/// @brief DOCME
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///
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/// DOCME
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/// @brief Implements reading of YUV4MPEG uncompressed video files
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class YUV4MPEGVideoProvider : public VideoProvider {
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private:
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/// DOCME
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/// Pixel formats
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enum Y4M_PixelFormat {
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Y4M_PIXFMT_NONE = -1, /// not set/unknown
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/// DOCME
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Y4M_PIXFMT_NONE = -1,
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/// 4:2:0 sampling variants.
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/// afaict the only difference between these three
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/// is the chroma sample location, and nobody cares about that.
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Y4M_PIXFMT_420JPEG, /// 4:2:0, H/V centered, for JPEG/MPEG-1
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Y4M_PIXFMT_420MPEG2, /// 4:2:0, H cosited, for MPEG-2
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Y4M_PIXFMT_420PALDV, /// 4:2:0, alternating Cb/Cr, for PAL-DV
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/// DOCME
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Y4M_PIXFMT_420JPEG, // afaict the only difference between
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Y4M_PIXFMT_411, /// 4:1:1, H cosited
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Y4M_PIXFMT_422, /// 4:2:2, H cosited
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Y4M_PIXFMT_444, /// 4:4:4, i.e. no chroma subsampling
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Y4M_PIXFMT_444ALPHA, /// 4:4:4 plus alpha channel
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/// DOCME
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Y4M_PIXFMT_420MPEG2, // these three is the chroma sample location,
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/// DOCME
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Y4M_PIXFMT_420PALDV, // and nobody cares about that.
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/// DOCME
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Y4M_PIXFMT_411,
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/// DOCME
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Y4M_PIXFMT_422,
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/// DOCME
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Y4M_PIXFMT_444,
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/// DOCME
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Y4M_PIXFMT_444ALPHA,
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/// DOCME
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Y4M_PIXFMT_MONO,
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Y4M_PIXFMT_MONO, /// luma only (grayscale)
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};
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/// DOCME
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/// Interlacing mode for an entire stream
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enum Y4M_InterlacingMode {
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Y4M_ILACE_NOTSET = -1, /// undefined
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Y4M_ILACE_PROGRESSIVE, /// progressive (no interlacing)
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/// DOCME
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Y4M_ILACE_NOTSET = -1, // not to be confused with Y4M_ILACE_UNKNOWN
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Y4M_ILACE_TFF, /// interlaced, top field first
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Y4M_ILACE_BFF, /// interlaced, bottom field first
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/// DOCME
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Y4M_ILACE_PROGRESSIVE,
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/// DOCME
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Y4M_ILACE_TFF,
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/// DOCME
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Y4M_ILACE_BFF,
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/// DOCME
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Y4M_ILACE_MIXED,
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/// DOCME
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Y4M_ILACE_UNKNOWN,
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Y4M_ILACE_MIXED, /// mixed interlaced/progressive, possibly with RFF flags
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Y4M_ILACE_UNKNOWN, /// unknown interlacing mode (not the same as undefined)
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};
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/// DOCME
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/// Frame information flags
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enum Y4M_FrameFlags {
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Y4M_FFLAG_NOTSET = -1, /// undefined
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Y4M_FFLAG_NONE = 0x0000, /// no flags set
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/// DOCME
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Y4M_FFLAG_NOTSET = -1,
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/// field order/repeat field flags
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Y4M_FFLAG_R_TFF = 0x0001, /// top field first
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Y4M_FFLAG_R_TFF_R = 0x0002, /// top field first, and repeat that field
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Y4M_FFLAG_R_BFF = 0x0004, /// bottom field first
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Y4M_FFLAG_R_BFF_R = 0x0008, /// bottom field first, and repeat that field
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Y4M_FFLAG_R_P = 0x0010, /// progressive
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Y4M_FFLAG_R_P_R = 0x0020, /// progressive, and repeat frame once
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Y4M_FFLAG_R_P_RR = 0x0040, /// progressive, and repeat frame twice
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/// DOCME
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Y4M_FFLAG_NONE = 0x0000,
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/// temporal sampling flags
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Y4M_FFLAG_T_P = 0x0080, /// progressive (fields sampled at the same time)
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Y4M_FFLAG_T_I = 0x0100, /// interlaced (fields sampled at different times)
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/// DOCME
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Y4M_FFLAG_R_TFF = 0x0001, // TFF
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/// DOCME
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Y4M_FFLAG_R_TFF_R = 0x0002, // TFF and repeat
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/// DOCME
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Y4M_FFLAG_R_BFF = 0x0004, // BFF
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/// DOCME
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Y4M_FFLAG_R_BFF_R = 0x0008, // BFF and repeat
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/// DOCME
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Y4M_FFLAG_R_P = 0x0010, // progressive
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/// DOCME
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Y4M_FFLAG_R_P_R = 0x0020, // progressive and repeat once
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/// DOCME
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Y4M_FFLAG_R_P_RR = 0x0040, // progressive and repeat twice
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/// DOCME
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Y4M_FFLAG_T_P = 0x0080, // progressive (fields sampled at the same time)
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/// DOCME
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Y4M_FFLAG_T_I = 0x0100, // interlaced (fields sampled at different times)
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/// DOCME
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Y4M_FFLAG_C_P = 0x0200, // progressive (whole frame subsampled)
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/// DOCME
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Y4M_FFLAG_C_I = 0x0400, // interlaced (fields subsampled independently)
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/// DOCME
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Y4M_FFLAG_C_UNKNOWN = 0x0800, // unknown (only allowed for non-4:2:0 sampling)
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/// chroma subsampling flags
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Y4M_FFLAG_C_P = 0x0200, /// progressive (whole frame subsampled)
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Y4M_FFLAG_C_I = 0x0400, /// interlaced (fields subsampled independently)
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Y4M_FFLAG_C_UNKNOWN = 0x0800, /// unknown (only allowed for non-4:2:0 sampling)
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};
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/// DOCME
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FILE *sf; // source file
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FILE *sf; /// source file
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bool inited; /// initialization state
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/// DOCME
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bool inited;
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int w, h; /// frame width/height
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int num_frames; /// length of file in frames
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int frame_sz; /// size of each frame in bytes
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int luma_sz; /// size of the luma plane of each frame, in bytes
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int chroma_sz; /// size of one of the two chroma planes of each frame, in bytes
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int cur_fn; /// current frame number
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/// DOCME
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/// DOCME
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int w, h; // width/height
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/// DOCME
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int num_frames; // length of file in frames
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|
||||
/// DOCME
|
||||
int frame_sz; // size of each frame in bytes
|
||||
|
||||
/// DOCME
|
||||
Y4M_PixelFormat pixfmt; // colorspace/pixel format
|
||||
|
||||
/// DOCME
|
||||
Y4M_InterlacingMode imode; // interlacing mode
|
||||
Y4M_PixelFormat pixfmt; /// colorspace/pixel format
|
||||
Y4M_InterlacingMode imode; /// interlacing mode (for the entire stream)
|
||||
struct {
|
||||
int num; /// numerator
|
||||
int den; /// denominator
|
||||
} fps_rat; /// framerate
|
||||
|
||||
/// DOCME
|
||||
int num;
|
||||
/// a list of byte positions detailing where in the file
|
||||
/// each frame header can be found
|
||||
std::vector<int64_t> seek_table;
|
||||
|
||||
/// DOCME
|
||||
int den;
|
||||
|
||||
/// DOCME
|
||||
} fps_rat; // framerate
|
||||
|
||||
|
||||
/// DOCME
|
||||
std::vector<int64_t> seek_table; // the position in the file of each frame, in bytes
|
||||
|
||||
/// DOCME
|
||||
int cur_fn; // current frame number
|
||||
|
||||
|
||||
/// DOCME
|
||||
wxString errmsg;
|
||||
wxString errmsg; /// error message
|
||||
|
||||
void LoadVideo(const wxString filename);
|
||||
void Close();
|
||||
|
|
@ -224,33 +156,11 @@ public:
|
|||
int GetHeight();
|
||||
double GetFPS();
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
bool AreKeyFramesLoaded() { return false; }
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
wxArrayInt GetKeyFrames() { return wxArrayInt(); }
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
bool IsVFR() { return false; };
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
FrameRate GetTrueFrameRate() { return FrameRate(); }
|
||||
|
||||
/// @brief DOCME
|
||||
/// @return
|
||||
///
|
||||
wxString GetDecoderName() { return L"YUV4MPEG"; }
|
||||
|
||||
/// @brief DOCME
|
||||
///
|
||||
int GetDesiredCacheSize() { return 8; }
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue