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/*
* Intel MediaSDK QSV based MPEG2 decoder
*
* copyright (c) 2015 Anton Khirnov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <string.h>
#include <mfx/mfxvideo.h>
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "qsv_internal.h"
#include "qsvdec.h"
#include "qsv.h"
typedef struct QSVMPEG2Context {
AVClass *class;
QSVContext qsv;
AVFifoBuffer *packet_fifo;
AVPacket input_ref;
} QSVMPEG2Context;
static void qsv_clear_buffers(QSVMPEG2Context *s)
{
AVPacket pkt;
while (av_fifo_size(s->packet_fifo) >= sizeof(pkt)) {
av_fifo_generic_read(s->packet_fifo, &pkt, sizeof(pkt), NULL);
av_packet_unref(&pkt);
}
av_packet_unref(&s->input_ref);
}
static av_cold int qsv_decode_close(AVCodecContext *avctx)
{
QSVMPEG2Context *s = avctx->priv_data;
ff_qsv_decode_close(&s->qsv);
qsv_clear_buffers(s);
av_fifo_free(s->packet_fifo);
return 0;
}
static av_cold int qsv_decode_init(AVCodecContext *avctx)
{
QSVMPEG2Context *s = avctx->priv_data;
int ret;
s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
if (!s->packet_fifo) {
ret = AVERROR(ENOMEM);
goto fail;
}
s->qsv.iopattern = MFX_IOPATTERN_OUT_SYSTEM_MEMORY;
return 0;
fail:
qsv_decode_close(avctx);
return ret;
}
static int qsv_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
QSVMPEG2Context *s = avctx->priv_data;
AVFrame *frame = data;
int ret;
/* buffer the input packet */
if (avpkt->size) {
AVPacket input_ref = { 0 };
if (av_fifo_space(s->packet_fifo) < sizeof(input_ref)) {
ret = av_fifo_realloc2(s->packet_fifo,
av_fifo_size(s->packet_fifo) + sizeof(input_ref));
if (ret < 0)
return ret;
}
ret = av_packet_ref(&input_ref, avpkt);
if (ret < 0)
return ret;
av_fifo_generic_write(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
}
/* process buffered data */
while (!*got_frame) {
if (s->input_ref.size <= 0) {
/* no more data */
if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
return avpkt->size ? avpkt->size : ff_qsv_process_data(avctx, &s->qsv, frame, got_frame, avpkt);
av_packet_unref(&s->input_ref);
av_fifo_generic_read(s->packet_fifo, &s->input_ref, sizeof(s->input_ref), NULL);
}
ret = ff_qsv_process_data(avctx, &s->qsv, frame, got_frame, &s->input_ref);
if (ret < 0)
return ret;
s->input_ref.size -= ret;
s->input_ref.data += ret;
}
return avpkt->size;
}
static void qsv_decode_flush(AVCodecContext *avctx)
{
QSVMPEG2Context *s = avctx->priv_data;
qsv_clear_buffers(s);
ff_qsv_decode_flush(avctx, &s->qsv);
}
AVHWAccel ff_mpeg2_qsv_hwaccel = {
.name = "mpeg2_qsv",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.pix_fmt = AV_PIX_FMT_QSV,
};
#define OFFSET(x) offsetof(QSVMPEG2Context, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "async_depth", "Internal parallelization depth, the higher the value the higher the latency.", OFFSET(qsv.async_depth), AV_OPT_TYPE_INT, { .i64 = ASYNC_DEPTH_DEFAULT }, 0, INT_MAX, VD },
{ NULL },
};
static const AVClass class = {
.class_name = "mpeg2_qsv",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_mpeg2_qsv_decoder = {
.name = "mpeg2_qsv",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video (Intel Quick Sync Video acceleration)"),
.priv_data_size = sizeof(QSVMPEG2Context),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.init = qsv_decode_init,
.decode = qsv_decode_frame,
.flush = qsv_decode_flush,
.close = qsv_decode_close,
.capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1,
.priv_class = &class,
};
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