74 строки
2.5 KiB
C
74 строки
2.5 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef WEBMDEC_H_
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#define WEBMDEC_H_
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#include "./tools_common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct VpxInputContext;
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struct WebmInputContext {
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void *reader;
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void *segment;
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uint8_t *buffer;
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const void *cluster;
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const void *block_entry;
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const void *block;
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int block_frame_index;
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int video_track_index;
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uint64_t timestamp_ns;
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int is_key_frame;
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int reached_eos;
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};
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// Checks if the input is a WebM file. If so, initializes WebMInputContext so
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// that webm_read_frame can be called to retrieve a video frame.
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// Returns 1 on success and 0 on failure or input is not WebM file.
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// TODO(vigneshv): Refactor this function into two smaller functions specific
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// to their task.
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int file_is_webm(struct WebmInputContext *webm_ctx,
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struct VpxInputContext *aom_ctx);
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// Reads a WebM Video Frame. Memory for the buffer is created, owned and managed
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// by this function. For the first call, |buffer| should be NULL and
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// |*bytes_in_buffer| should be 0. Once all the frames are read and used,
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// webm_free() should be called, otherwise there will be a leak.
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// Parameters:
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// webm_ctx - WebmInputContext object
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// buffer - pointer where the frame data will be filled.
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// bytes_in_buffer - pointer to buffer size.
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// buffer_size - unused TODO(vigneshv): remove this
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// Return values:
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// 0 - Success
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// 1 - End of Stream
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// -1 - Error
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// TODO(vigneshv): Make the return values consistent across all functions in
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// this file.
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int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
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size_t *bytes_in_buffer, size_t *buffer_size);
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// Guesses the frame rate of the input file based on the container timestamps.
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int webm_guess_framerate(struct WebmInputContext *webm_ctx,
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struct VpxInputContext *aom_ctx);
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// Resets the WebMInputContext.
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void webm_free(struct WebmInputContext *webm_ctx);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBMDEC_H_
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