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      1 /*
      2  * libjingle
      3  * Copyright 2004 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "talk/media/webrtc/webrtcpassthroughrender.h"
     29 
     30 #include "talk/base/common.h"
     31 #include "talk/base/logging.h"
     32 
     33 namespace cricket {
     34 
     35 #define LOG_FIND_STREAM_ERROR(func, id) LOG(LS_ERROR) \
     36     << "" << func << " - Failed to find stream: " << id
     37 
     38 class PassthroughStream: public webrtc::VideoRenderCallback {
     39  public:
     40   explicit PassthroughStream(const uint32_t stream_id)
     41       : stream_id_(stream_id),
     42         running_(false) {
     43   }
     44   virtual ~PassthroughStream() {
     45   }
     46   virtual int32_t RenderFrame(const uint32_t stream_id,
     47                               webrtc::I420VideoFrame& videoFrame) {
     48     talk_base::CritScope cs(&stream_critical_);
     49     // Send frame for rendering directly
     50     if (running_ && renderer_) {
     51       renderer_->RenderFrame(stream_id, videoFrame);
     52     }
     53     return 0;
     54   }
     55   int32_t SetRenderer(VideoRenderCallback* renderer) {
     56     talk_base::CritScope cs(&stream_critical_);
     57     renderer_ = renderer;
     58     return 0;
     59   }
     60 
     61   int32_t StartRender() {
     62     talk_base::CritScope cs(&stream_critical_);
     63     running_ = true;
     64     return 0;
     65   }
     66 
     67   int32_t StopRender() {
     68     talk_base::CritScope cs(&stream_critical_);
     69     running_ = false;
     70     return 0;
     71   }
     72 
     73  private:
     74   uint32_t stream_id_;
     75   VideoRenderCallback* renderer_;
     76   talk_base::CriticalSection stream_critical_;
     77   bool running_;
     78 };
     79 
     80 WebRtcPassthroughRender::WebRtcPassthroughRender()
     81     : window_(NULL) {
     82 }
     83 
     84 WebRtcPassthroughRender::~WebRtcPassthroughRender() {
     85   while (!stream_render_map_.empty()) {
     86     PassthroughStream* stream = stream_render_map_.begin()->second;
     87     stream_render_map_.erase(stream_render_map_.begin());
     88     delete stream;
     89   }
     90 }
     91 
     92 webrtc::VideoRenderCallback* WebRtcPassthroughRender::AddIncomingRenderStream(
     93     const uint32_t stream_id,
     94     const uint32_t zOrder,
     95     const float left, const float top,
     96     const float right, const float bottom) {
     97   talk_base::CritScope cs(&render_critical_);
     98   // Stream already exist.
     99   if (FindStream(stream_id) != NULL) {
    100     LOG(LS_ERROR) << "AddIncomingRenderStream - Stream already exists: "
    101                   << stream_id;
    102     return NULL;
    103   }
    104 
    105   PassthroughStream* stream = new PassthroughStream(stream_id);
    106   // Store the stream
    107   stream_render_map_[stream_id] = stream;
    108   return stream;
    109 }
    110 
    111 int32_t WebRtcPassthroughRender::DeleteIncomingRenderStream(
    112     const uint32_t stream_id) {
    113   talk_base::CritScope cs(&render_critical_);
    114   PassthroughStream* stream = FindStream(stream_id);
    115   if (stream == NULL) {
    116     LOG_FIND_STREAM_ERROR("DeleteIncomingRenderStream", stream_id);
    117     return -1;
    118   }
    119   delete stream;
    120   stream_render_map_.erase(stream_id);
    121   return 0;
    122 }
    123 
    124 int32_t WebRtcPassthroughRender::AddExternalRenderCallback(
    125     const uint32_t stream_id,
    126     webrtc::VideoRenderCallback* render_object) {
    127   talk_base::CritScope cs(&render_critical_);
    128   PassthroughStream* stream = FindStream(stream_id);
    129   if (stream == NULL) {
    130     LOG_FIND_STREAM_ERROR("AddExternalRenderCallback", stream_id);
    131     return -1;
    132   }
    133   return stream->SetRenderer(render_object);
    134 }
    135 
    136 bool WebRtcPassthroughRender::HasIncomingRenderStream(
    137     const uint32_t stream_id) const {
    138   return (FindStream(stream_id) != NULL);
    139 }
    140 
    141 webrtc::RawVideoType WebRtcPassthroughRender::PreferredVideoType() const {
    142   return webrtc::kVideoI420;
    143 }
    144 
    145 int32_t WebRtcPassthroughRender::StartRender(const uint32_t stream_id) {
    146   talk_base::CritScope cs(&render_critical_);
    147   PassthroughStream* stream = FindStream(stream_id);
    148   if (stream == NULL) {
    149     LOG_FIND_STREAM_ERROR("StartRender", stream_id);
    150     return -1;
    151   }
    152   return stream->StartRender();
    153 }
    154 
    155 int32_t WebRtcPassthroughRender::StopRender(const uint32_t stream_id) {
    156   talk_base::CritScope cs(&render_critical_);
    157   PassthroughStream* stream = FindStream(stream_id);
    158   if (stream == NULL) {
    159     LOG_FIND_STREAM_ERROR("StopRender", stream_id);
    160     return -1;
    161   }
    162   return stream->StopRender();
    163 }
    164 
    165 // TODO(ronghuawu): Is it ok to return non-const pointer to PassthroughStream
    166 // from this const function FindStream.
    167 PassthroughStream* WebRtcPassthroughRender::FindStream(
    168     const uint32_t stream_id) const {
    169   StreamMap::const_iterator it = stream_render_map_.find(stream_id);
    170   if (it == stream_render_map_.end()) {
    171     return NULL;
    172   }
    173   return it->second;
    174 }
    175 
    176 }  // namespace cricket
    177