| /* |
| * Copyright (c) 2013 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| #ifndef WEBMDEC_H_ |
| #define WEBMDEC_H_ |
| |
| #include "./tools_common.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| struct VpxInputContext; |
| |
| struct WebmInputContext { |
| void *reader; |
| void *segment; |
| uint8_t *buffer; |
| const void *cluster; |
| const void *block_entry; |
| const void *block; |
| int block_frame_index; |
| int video_track_index; |
| uint64_t timestamp_ns; |
| int is_key_frame; |
| int reached_eos; |
| }; |
| |
| // Checks if the input is a WebM file. If so, initializes WebMInputContext so |
| // that webm_read_frame can be called to retrieve a video frame. |
| // Returns 1 on success and 0 on failure or input is not WebM file. |
| // TODO(vigneshv): Refactor this function into two smaller functions specific |
| // to their task. |
| int file_is_webm(struct WebmInputContext *webm_ctx, |
| struct VpxInputContext *vpx_ctx); |
| |
| // Reads a WebM Video Frame. Memory for the buffer is created, owned and managed |
| // by this function. For the first call, |buffer| should be NULL and |
| // |*bytes_in_buffer| should be 0. Once all the frames are read and used, |
| // webm_free() should be called, otherwise there will be a leak. |
| // Parameters: |
| // webm_ctx - WebmInputContext object |
| // buffer - pointer where the frame data will be filled. |
| // bytes_in_buffer - pointer to buffer size. |
| // buffer_size - unused TODO(vigneshv): remove this |
| // Return values: |
| // 0 - Success |
| // 1 - End of Stream |
| // -1 - Error |
| // TODO(vigneshv): Make the return values consistent across all functions in |
| // this file. |
| int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer, |
| size_t *bytes_in_buffer, size_t *buffer_size); |
| |
| // Guesses the frame rate of the input file based on the container timestamps. |
| int webm_guess_framerate(struct WebmInputContext *webm_ctx, |
| struct VpxInputContext *vpx_ctx); |
| |
| // Resets the WebMInputContext. |
| void webm_free(struct WebmInputContext *webm_ctx); |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif // WEBMDEC_H_ |