media: Optimize the thumbnail extraction by sending just one frame.

#include <utils/Log.h>

#include <gui/Surface.h>

#include "include/avc_utils.h"

#include "include/StagefrightMetadataRetriever.h"

#include <media/ICrypto.h>

    int64_t timeUs;

    size_t retriesLeft = kRetryCount;

    bool done = false;

    const char *mime;

    bool success = format->findCString(kKeyMIMEType, &mime);

    if (!success) {

        ALOGE("Could not find mime type");

        return NULL;

    }

    bool isAvcOrHevc = !strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)

            || !strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_HEVC);

    do {

        size_t inputIndex = -1;

                memcpy(codecBuffer->data(),

                        (const uint8_t*)mediaBuffer->data() + mediaBuffer->range_offset(),

                        mediaBuffer->range_length());

                if (isAvcOrHevc && IsIDR(codecBuffer)) {

                    // Only need to decode one IDR frame.

                    haveMoreInputs = false;

                    flags |= MediaCodec::BUFFER_FLAG_EOS;

                }

            }

            mediaBuffer->release();