src/media/base/stream_parser_buffer.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/base/stream_parser_buffer.h"
   6
   7 #include "base/logging.h"
   8 #include "media/base/buffers.h"
   9
  10 namespace media {
  11
  12 static scoped_refptr<StreamParserBuffer> CopyBuffer(
  13     const StreamParserBuffer& buffer) {
  14   if (buffer.end_of_stream())
  15     return StreamParserBuffer::CreateEOSBuffer();
  16
  17   scoped_refptr<StreamParserBuffer> copied_buffer =
  18       StreamParserBuffer::CopyFrom(buffer.data(),
  19                                    buffer.data_size(),
  20                                    buffer.side_data(),
  21                                    buffer.side_data_size(),
  22                                    buffer.IsKeyframe(),
  23                                    buffer.type(),
  24                                    buffer.track_id());
  25   copied_buffer->SetDecodeTimestamp(buffer.GetDecodeTimestamp());
  26   copied_buffer->SetConfigId(buffer.GetConfigId());
  27   copied_buffer->set_timestamp(buffer.timestamp());
  28   copied_buffer->set_duration(buffer.duration());
  29   copied_buffer->set_discard_padding(buffer.discard_padding());
  30   copied_buffer->set_splice_timestamp(buffer.splice_timestamp());
  31   const DecryptConfig* decrypt_config = buffer.decrypt_config();
  32   if (decrypt_config) {
  33     copied_buffer->set_decrypt_config(
  34         make_scoped_ptr(new DecryptConfig(decrypt_config->key_id(),
  35                                           decrypt_config->iv(),
  36                                           decrypt_config->subsamples())));
  37   }
  38
  39   return copied_buffer;
  40 }
  41
  42 scoped_refptr<StreamParserBuffer> StreamParserBuffer::CreateEOSBuffer() {
  43   return make_scoped_refptr(new StreamParserBuffer(NULL, 0, NULL, 0, false,
  44                                                    DemuxerStream::UNKNOWN, 0));
  45 }
  46
  47 scoped_refptr<StreamParserBuffer> StreamParserBuffer::CopyFrom(
  48     const uint8* data, int data_size, bool is_keyframe, Type type,
  49     TrackId track_id) {
  50   return make_scoped_refptr(
  51       new StreamParserBuffer(data, data_size, NULL, 0, is_keyframe, type,
  52                              track_id));
  53 }
  54
  55 scoped_refptr<StreamParserBuffer> StreamParserBuffer::CopyFrom(
  56     const uint8* data, int data_size,
  57     const uint8* side_data, int side_data_size,
  58     bool is_keyframe, Type type, TrackId track_id) {
  59   return make_scoped_refptr(
  60       new StreamParserBuffer(data, data_size, side_data, side_data_size,
  61                              is_keyframe, type, track_id));
  62 }
  63
  64 base::TimeDelta StreamParserBuffer::GetDecodeTimestamp() const {
  65   if (decode_timestamp_ == kNoTimestamp())
  66     return timestamp();
  67   return decode_timestamp_;
  68 }
  69
  70 void StreamParserBuffer::SetDecodeTimestamp(const base::TimeDelta& timestamp) {
  71   decode_timestamp_ = timestamp;
  72 }
  73
  74 StreamParserBuffer::StreamParserBuffer(const uint8* data, int data_size,
  75                                        const uint8* side_data,
  76                                        int side_data_size, bool is_keyframe,
  77                                        Type type, TrackId track_id)
  78     : DecoderBuffer(data, data_size, side_data, side_data_size),
  79       is_keyframe_(is_keyframe),
  80       decode_timestamp_(kNoTimestamp()),
  81       config_id_(kInvalidConfigId),
  82       type_(type),
  83       track_id_(track_id) {
  84   // TODO(scherkus): Should DataBuffer constructor accept a timestamp and
  85   // duration to force clients to set them? Today they end up being zero which
  86   // is both a common and valid value and could lead to bugs.
  87   if (data) {
  88     set_duration(kNoTimestamp());
  89   }
  90 }
  91
  92 StreamParserBuffer::~StreamParserBuffer() {}
  93
  94 int StreamParserBuffer::GetConfigId() const {
  95   return config_id_;
  96 }
  97
  98 void StreamParserBuffer::SetConfigId(int config_id) {
  99   config_id_ = config_id;
 100 }
 101
 102 void StreamParserBuffer::ConvertToSpliceBuffer(
 103     const BufferQueue& pre_splice_buffers) {
 104   DCHECK(splice_buffers_.empty());
 105   DCHECK(!end_of_stream());
 106
 107   // Make a copy of this first, before making any changes.
 108   scoped_refptr<StreamParserBuffer> overlapping_buffer = CopyBuffer(*this);
 109   overlapping_buffer->set_splice_timestamp(kNoTimestamp());
 110
 111   const scoped_refptr<StreamParserBuffer>& first_splice_buffer =
 112       pre_splice_buffers.front();
 113
 114   // Ensure the given buffers are actually before the splice point.
 115   DCHECK(first_splice_buffer->timestamp() <= overlapping_buffer->timestamp());
 116
 117   // TODO(dalecurtis): We should also clear |data| and |side_data|, but since
 118   // that implies EOS care must be taken to ensure there are no clients relying
 119   // on that behavior.
 120
 121   // Rewrite |this| buffer as a splice buffer.
 122   SetDecodeTimestamp(first_splice_buffer->GetDecodeTimestamp());
 123   SetConfigId(first_splice_buffer->GetConfigId());
 124   set_timestamp(first_splice_buffer->timestamp());
 125   is_keyframe_ = first_splice_buffer->IsKeyframe();
 126   type_ = first_splice_buffer->type();
 127   track_id_ = first_splice_buffer->track_id();
 128   set_splice_timestamp(overlapping_buffer->timestamp());
 129
 130   // The splice duration is the duration of all buffers before the splice plus
 131   // the highest ending timestamp after the splice point.
 132   set_duration(
 133       std::max(overlapping_buffer->timestamp() + overlapping_buffer->duration(),
 134                pre_splice_buffers.back()->timestamp() +
 135                    pre_splice_buffers.back()->duration()) -
 136       first_splice_buffer->timestamp());
 137
 138   // Copy all pre splice buffers into our wrapper buffer.
 139   for (BufferQueue::const_iterator it = pre_splice_buffers.begin();
 140        it != pre_splice_buffers.end();
 141        ++it) {
 142     const scoped_refptr<StreamParserBuffer>& buffer = *it;
 143     DCHECK(!buffer->end_of_stream());
 144     DCHECK(buffer->get_splice_buffers().empty());
 145     splice_buffers_.push_back(CopyBuffer(*buffer));
 146     splice_buffers_.back()->set_splice_timestamp(splice_timestamp());
 147   }
 148
 149   splice_buffers_.push_back(overlapping_buffer);
 150 }
 151
 152 }  // namespace media