mirror of https://github.com/mpv-player/mpv
271 lines
11 KiB
C++
271 lines
11 KiB
C++
////////// Codec-specific routines used to interface between "MPlayer"
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////////// and the "LIVE.COM Streaming Media" libraries:
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#include "demux_rtp_internal.h"
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extern "C" {
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#include "stheader.h"
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}
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static void
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needVideoFrameRate(demuxer_t* demuxer, MediaSubsession* subsession); // forward
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static Boolean
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parseQTState_video(QuickTimeGenericRTPSource::QTState const& qtState,
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unsigned& fourcc); // forward
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static Boolean
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parseQTState_audio(QuickTimeGenericRTPSource::QTState const& qtState,
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unsigned& fourcc, unsigned& numChannels); // forward
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void rtpCodecInitialize_video(demuxer_t* demuxer,
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MediaSubsession* subsession,
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unsigned& flags) {
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flags = 0;
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// Create a dummy video stream header
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// to make the main MPlayer code happy:
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sh_video_t* sh_video = new_sh_video(demuxer,0);
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BITMAPINFOHEADER* bih
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= (BITMAPINFOHEADER*)calloc(1,sizeof(BITMAPINFOHEADER));
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bih->biSize = sizeof(BITMAPINFOHEADER);
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sh_video->bih = bih;
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demux_stream_t* d_video = demuxer->video;
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d_video->sh = sh_video; sh_video->ds = d_video;
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// Map known video MIME types to the BITMAPINFOHEADER parameters
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// that this program uses. (Note that not all types need all
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// of the parameters to be set.)
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if (strcmp(subsession->codecName(), "MPV") == 0) {
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flags |= RTPSTATE_IS_MPEG12_VIDEO;
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} else if (strcmp(subsession->codecName(), "MP1S") == 0 ||
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strcmp(subsession->codecName(), "MP2T") == 0) {
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flags |= RTPSTATE_IS_MPEG12_VIDEO|RTPSTATE_IS_MULTIPLEXED;
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} else if (strcmp(subsession->codecName(), "H263") == 0 ||
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strcmp(subsession->codecName(), "H263-1998") == 0) {
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bih->biCompression = sh_video->format
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= mmioFOURCC('H','2','6','3');
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needVideoFrameRate(demuxer, subsession);
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} else if (strcmp(subsession->codecName(), "H261") == 0) {
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bih->biCompression = sh_video->format
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= mmioFOURCC('H','2','6','1');
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needVideoFrameRate(demuxer, subsession);
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} else if (strcmp(subsession->codecName(), "JPEG") == 0) {
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bih->biCompression = sh_video->format
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= mmioFOURCC('M','J','P','G');
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needVideoFrameRate(demuxer, subsession);
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} else if (strcmp(subsession->codecName(), "MP4V-ES") == 0) {
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bih->biCompression = sh_video->format
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= mmioFOURCC('m','p','4','v');
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// For the codec to work correctly, it may need a 'VOL Header' to be
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// inserted at the front of the data stream. Construct this from the
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// "config" MIME parameter, which was present (hopefully) in the
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// session's SDP description:
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unsigned configLen;
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unsigned char* configData
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= parseGeneralConfigStr(subsession->fmtp_config(), configLen);
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insertRTPData(demuxer, demuxer->video, configData, configLen);
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needVideoFrameRate(demuxer, subsession);
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} else if (strcmp(subsession->codecName(), "X-QT") == 0 ||
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strcmp(subsession->codecName(), "X-QUICKTIME") == 0) {
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// QuickTime generic RTP format, as described in
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// http://developer.apple.com/quicktime/icefloe/dispatch026.html
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// We can't initialize this stream until we've received the first packet
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// that has QuickTime "sdAtom" information in the header. So, keep
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// reading packets until we get one:
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unsigned char* packetData; unsigned packetDataLen; float pts;
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QuickTimeGenericRTPSource* qtRTPSource
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= (QuickTimeGenericRTPSource*)(subsession->rtpSource());
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unsigned fourcc;
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do {
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if (!awaitRTPPacket(demuxer, demuxer->video,
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packetData, packetDataLen, pts)) {
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return;
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}
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} while (!parseQTState_video(qtRTPSource->qtState, fourcc));
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bih->biCompression = sh_video->format = fourcc;
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} else {
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fprintf(stderr,
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"Unknown MPlayer format code for MIME type \"video/%s\"\n",
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subsession->codecName());
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}
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}
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void rtpCodecInitialize_audio(demuxer_t* demuxer,
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MediaSubsession* subsession,
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unsigned& flags) {
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flags = 0;
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// Create a dummy audio stream header
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// to make the main MPlayer code happy:
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sh_audio_t* sh_audio = new_sh_audio(demuxer,0);
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WAVEFORMATEX* wf = (WAVEFORMATEX*)calloc(1,sizeof(WAVEFORMATEX));
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sh_audio->wf = wf;
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demux_stream_t* d_audio = demuxer->audio;
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d_audio->sh = sh_audio; sh_audio->ds = d_audio;
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wf->nChannels = subsession->numChannels();
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// Map known audio MIME types to the WAVEFORMATEX parameters
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// that this program uses. (Note that not all types need all
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// of the parameters to be set.)
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wf->nSamplesPerSec
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= subsession->rtpSource()->timestampFrequency(); // by default
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if (strcmp(subsession->codecName(), "MPA") == 0 ||
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strcmp(subsession->codecName(), "MPA-ROBUST") == 0 ||
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strcmp(subsession->codecName(), "X-MP3-DRAFT-00") == 0) {
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wf->wFormatTag = sh_audio->format = 0x55;
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// Note: 0x55 is for layer III, but should work for I,II also
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wf->nSamplesPerSec = 0; // sample rate is deduced from the data
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} else if (strcmp(subsession->codecName(), "AC3") == 0) {
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wf->wFormatTag = sh_audio->format = 0x2000;
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wf->nSamplesPerSec = 0; // sample rate is deduced from the data
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} else if (strcmp(subsession->codecName(), "L16") == 0) {
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wf->wFormatTag = sh_audio->format = 0x736f7774; // "twos"
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wf->nBlockAlign = 1;
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wf->wBitsPerSample = 16;
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wf->cbSize = 0;
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} else if (strcmp(subsession->codecName(), "L8") == 0) {
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wf->wFormatTag = sh_audio->format = 0x20776172; // "raw "
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wf->nBlockAlign = 1;
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wf->wBitsPerSample = 8;
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wf->cbSize = 0;
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} else if (strcmp(subsession->codecName(), "PCMU") == 0) {
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wf->wFormatTag = sh_audio->format = 0x7;
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wf->nAvgBytesPerSec = 8000;
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wf->nBlockAlign = 1;
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wf->wBitsPerSample = 8;
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wf->cbSize = 0;
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} else if (strcmp(subsession->codecName(), "PCMA") == 0) {
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wf->wFormatTag = sh_audio->format = 0x6;
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wf->nAvgBytesPerSec = 8000;
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wf->nBlockAlign = 1;
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wf->wBitsPerSample = 8;
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wf->cbSize = 0;
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} else if (strcmp(subsession->codecName(), "GSM") == 0) {
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wf->wFormatTag = sh_audio->format = mmioFOURCC('a','g','s','m');
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wf->nAvgBytesPerSec = 1650;
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wf->nBlockAlign = 33;
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wf->wBitsPerSample = 16;
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wf->cbSize = 0;
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} else if (strcmp(subsession->codecName(), "QCELP") == 0) {
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wf->wFormatTag = sh_audio->format = mmioFOURCC('Q','c','l','p');
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wf->nAvgBytesPerSec = 1750;
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wf->nBlockAlign = 35;
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wf->wBitsPerSample = 16;
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wf->cbSize = 0;
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} else if (strcmp(subsession->codecName(), "MP4A-LATM") == 0) {
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wf->wFormatTag = sh_audio->format = mmioFOURCC('m','p','4','a');
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// For the codec to work correctly, it needs "AudioSpecificConfig"
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// data, which is parsed from the "StreamMuxConfig" string that
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// was present (hopefully) in the SDP description:
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unsigned codecdata_len;
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sh_audio->codecdata
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= parseStreamMuxConfigStr(subsession->fmtp_config(),
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codecdata_len);
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sh_audio->codecdata_len = codecdata_len;
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} else if (strcmp(subsession->codecName(), "MPEG4-GENERIC") == 0) {
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wf->wFormatTag = sh_audio->format = mmioFOURCC('m','p','4','a');
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// For the codec to work correctly, it needs "AudioSpecificConfig"
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// data, which was present (hopefully) in the SDP description:
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unsigned codecdata_len;
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sh_audio->codecdata
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= parseGeneralConfigStr(subsession->fmtp_config(),
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codecdata_len);
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sh_audio->codecdata_len = codecdata_len;
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} else if (strcmp(subsession->codecName(), "X-QT") == 0 ||
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strcmp(subsession->codecName(), "X-QUICKTIME") == 0) {
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// QuickTime generic RTP format, as described in
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// http://developer.apple.com/quicktime/icefloe/dispatch026.html
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// We can't initialize this stream until we've received the first packet
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// that has QuickTime "sdAtom" information in the header. So, keep
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// reading packets until we get one:
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unsigned char* packetData; unsigned packetDataLen; float pts;
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QuickTimeGenericRTPSource* qtRTPSource
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= (QuickTimeGenericRTPSource*)(subsession->rtpSource());
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unsigned fourcc, numChannels;
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do {
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if (!awaitRTPPacket(demuxer, demuxer->audio,
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packetData, packetDataLen, pts)) {
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return;
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}
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} while (!parseQTState_audio(qtRTPSource->qtState, fourcc, numChannels));
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wf->wFormatTag = sh_audio->format = fourcc;
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wf->nChannels = numChannels;
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} else {
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fprintf(stderr,
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"Unknown MPlayer format code for MIME type \"audio/%s\"\n",
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subsession->codecName());
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}
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}
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static void needVideoFrameRate(demuxer_t* demuxer,
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MediaSubsession* subsession) {
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// For some codecs, MPlayer's decoding software can't (or refuses to :-)
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// figure out the frame rate by itself, so (unless the user specifies
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// it manually, using "-fps") we figure it out ourselves here, using the
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// presentation timestamps in successive packets,
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extern float force_fps; if (force_fps != 0.0) return; // user used "-fps"
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demux_stream_t* d_video = demuxer->video;
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sh_video_t* sh_video = (sh_video_t*)(d_video->sh);
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// If we already know the subsession's video frame rate, use it:
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int fps = (int)(subsession->videoFPS());
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if (fps != 0) {
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sh_video->fps = fps;
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return;
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}
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// Keep looking at incoming frames until we see two with different,
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// non-zero "pts" timestamps:
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unsigned char* packetData; unsigned packetDataLen;
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float lastPTS = 0.0, curPTS;
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unsigned const maxNumFramesToWaitFor = 300;
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for (unsigned i = 0; i < maxNumFramesToWaitFor; ++i) {
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if (!awaitRTPPacket(demuxer, d_video, packetData, packetDataLen, curPTS)) {
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break;
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}
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if (curPTS > lastPTS && lastPTS != 0.0) {
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// Use the difference between these two "pts"s to guess the frame rate.
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// (should really check that there were no missing frames inbetween)#####
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// Guess the frame rate as an integer. If it's not, use "-fps" instead.
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fps = (int)(1/(curPTS-lastPTS) + 0.5); // rounding
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fprintf(stderr, "demux_rtp: Guessed the video frame rate as %d frames-per-second.\n\t(If this is wrong, use the \"-fps <frame-rate>\" option instead.)\n", fps);
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sh_video->fps = fps;
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return;
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}
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lastPTS = curPTS;
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}
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fprintf(stderr, "demux_rtp: Failed to guess the video frame rate\n");
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}
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static Boolean
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parseQTState_video(QuickTimeGenericRTPSource::QTState const& qtState,
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unsigned& fourcc) {
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// qtState's "sdAtom" field is supposed to contain a QuickTime video
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// 'sample description' atom. This atom's name is the 'fourcc' that we want:
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char const* sdAtom = qtState.sdAtom;
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if (sdAtom == NULL || qtState.sdAtomSize < 2*4) return False;
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fourcc = *(unsigned*)(&sdAtom[4]); // put in host order
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return True;
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}
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static Boolean
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parseQTState_audio(QuickTimeGenericRTPSource::QTState const& qtState,
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unsigned& fourcc, unsigned& numChannels) {
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// qtState's "sdAtom" field is supposed to contain a QuickTime audio
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// 'sample description' atom. This atom's name is the 'fourcc' that we want.
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// Also, the top half of the 5th word following the atom name should
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// contain the number of channels ("numChannels") that we want:
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char const* sdAtom = qtState.sdAtom;
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if (sdAtom == NULL || qtState.sdAtomSize < 7*4) return False;
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fourcc = *(unsigned*)(&sdAtom[4]); // put in host order
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char const* word7Ptr = &sdAtom[6*4];
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numChannels = (word7Ptr[0]<<8)|(word7Ptr[1]);
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return True;
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}
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