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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/ffmpeg/ffmpeg_decoding_loop.h"
#include "base/callback.h"
#include "base/logging.h"
#include "media/ffmpeg/ffmpeg_common.h"
namespace media {
FFmpegDecodingLoop::FFmpegDecodingLoop(AVCodecContext* context,
bool continue_on_decoding_errors)
: continue_on_decoding_errors_(continue_on_decoding_errors),
context_(context),
frame_(av_frame_alloc()) {}
FFmpegDecodingLoop::~FFmpegDecodingLoop() = default;
FFmpegDecodingLoop::DecodeStatus FFmpegDecodingLoop::DecodePacket(
const AVPacket* packet,
FrameReadyCB frame_ready_cb) {
bool sent_packet = false, frames_remaining = true, decoder_error = false;
while (!sent_packet || frames_remaining) {
if (!sent_packet) {
const int result = avcodec_send_packet(context_, packet);
if (result < 0 && result != AVERROR(EAGAIN) && result != AVERROR_EOF) {
DLOG(ERROR) << "Failed to send packet for decoding: " << result;
return DecodeStatus::kSendPacketFailed;
}
sent_packet = result != AVERROR(EAGAIN);
}
// See if any frames are available. If we receive an EOF or EAGAIN, there
// should be nothing left to do this pass since we've already provided the
// only input packet that we have.
const int result = avcodec_receive_frame(context_, frame_.get());
if (result == AVERROR_EOF || result == AVERROR(EAGAIN)) {
frames_remaining = false;
// TODO(dalecurtis): This should be a DCHECK() or MEDIA_LOG, but since
// this API is new, lets make it a CHECK first and monitor reports.
if (result == AVERROR(EAGAIN)) {
CHECK(sent_packet) << "avcodec_receive_frame() and "
"avcodec_send_packet() both returned EAGAIN, "
"which is an API violation.";
}
continue;
} else if (result < 0) {
DLOG(ERROR) << "Failed to decode frame: " << result;
last_averror_code_ = result;
if (!continue_on_decoding_errors_)
return DecodeStatus::kDecodeFrameFailed;
decoder_error = true;
continue;
}
const bool frame_processing_success = frame_ready_cb.Run(frame_.get());
av_frame_unref(frame_.get());
if (!frame_processing_success)
return DecodeStatus::kFrameProcessingFailed;
}
return decoder_error ? DecodeStatus::kDecodeFrameFailed : DecodeStatus::kOkay;
}
} // namespace media
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