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| 1 // Copyright 2014 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 #ifndef MEDIA_FORMATS_WEBM_CHROMEOS_WEBM_ENCODER_H_ | |
| 6 #define MEDIA_FORMATS_WEBM_CHROMEOS_WEBM_ENCODER_H_ | |
| 7 | |
| 8 #include <stdio.h> | |
| 9 #include <stack> | |
| 10 | |
| 11 #include "base/files/file_path.h" | |
| 12 #include "media/base/media_export.h" | |
| 13 #include "media/formats/webm/chromeos/ebml_writer.h" | |
| 14 | |
| 15 extern "C" { | |
| 16 #define VPX_CODEC_DISABLE_COMPAT 1 | |
| 17 #include "third_party/libvpx/source/libvpx/vpx/vpx_encoder.h" | |
| 18 #include "third_party/libvpx/source/libvpx/vpx/vp8cx.h" | |
| 19 } | |
| 20 | |
| 21 class SkBitmap; | |
| 22 | |
| 23 namespace base { | |
| 24 class FilePath; | |
| 25 } | |
| 26 | |
| 27 namespace media { | |
| 28 | |
| 29 namespace chromeos { | |
| 30 | |
| 31 // WebM encoder using libvpx. Currently only supports one-pass, constant bitrate | |
| 32 // encoding of short files consisting of a single video track. Seek info and | |
| 33 // cues are not supported, so generated .webm file does not strictly adhere to | |
| 34 // WebM standard (http://www.webmproject.org/code/specs/container/). | |
| 35 class MEDIA_EXPORT WebmEncoder { | |
| 36 public: | |
| 37 // Create new instance for writing to |output_path|. If |realtime| is |true|, | |
| 38 // uses realtime deadline, otherwise - "good quality" deadline. | |
| 39 WebmEncoder(const base::FilePath& output_path, int bitrate, bool realtime); | |
| 40 ~WebmEncoder(); | |
| 41 | |
| 42 // Encodes video from a Nx(N*M) sprite, having M frames of size NxN with FPS | |
| 43 // |fps_n/fps_d|. Must be called on a thread that allows disk IO. | |
| 44 // Returns |true| iff encoding and writing to file is successful. | |
| 45 bool EncodeFromSprite(const SkBitmap& sprite, int fps_n, int fps_d); | |
| 46 | |
| 47 private: | |
| 48 // Writes global WebM header and starts a single video track. Returns |false| | |
| 49 // if there was an error opening file for writing. | |
| 50 bool WriteWebmHeader(); | |
| 51 | |
| 52 // Writes VPX packet to output file. | |
| 53 void WriteWebmBlock(const vpx_codec_cx_pkt_t* packet); | |
| 54 | |
| 55 // Finishes video track and closes output file. Returns |false| if there were | |
| 56 // any error during encoding/writing file. | |
| 57 bool WriteWebmFooter(); | |
| 58 | |
| 59 // Starts a new WebM sub-element of given type. Those can be nested. | |
| 60 void StartSubElement(unsigned long class_id); | |
| 61 | |
| 62 // Closes current top-level sub-element. | |
| 63 void EndSubElement(); | |
| 64 | |
| 65 // libmkv callbacks. | |
| 66 void EbmlWrite(const void* buffer, unsigned long len); | |
| 67 void EbmlSerialize(const void* buffer, int buffer_size, unsigned long len); | |
| 68 | |
| 69 template <typename T> | |
| 70 void EbmlSerializeHelper(const T* buffer, unsigned long len); | |
| 71 | |
| 72 // Video dimensions and FPS. | |
| 73 size_t width_; | |
| 74 size_t height_; | |
| 75 vpx_rational_t fps_; | |
| 76 | |
| 77 // Number of frames in video. | |
| 78 size_t frame_count_; | |
| 79 | |
| 80 // VPX config in use. | |
| 81 vpx_codec_enc_cfg_t config_; | |
| 82 | |
| 83 // VPX parameters. | |
| 84 int bitrate_; | |
| 85 unsigned long deadline_; | |
| 86 | |
| 87 // EbmlWriter context. | |
| 88 EbmlGlobal ebml_writer_; | |
| 89 | |
| 90 // Stack with start offsets of currently open sub-elements. | |
| 91 std::stack<long int> ebml_sub_elements_; | |
| 92 | |
| 93 base::FilePath output_path_; | |
| 94 FILE* output_; | |
| 95 | |
| 96 // True if an error occured while encoding/writing to file. | |
| 97 bool has_errors_; | |
| 98 | |
| 99 DISALLOW_COPY_AND_ASSIGN(WebmEncoder); | |
| 100 }; | |
| 101 | |
| 102 } // namespace chromeos | |
| 103 | |
| 104 } // namespace media | |
| 105 | |
| 106 #endif // MEDIA_FORMATS_WEBM_CHROMEOS_WEBM_ENCODER_H_ | |
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