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/*
* Intel MediaSDK QSV based H.264 decoder
*
* copyright (c) 2013 Luca Barbato
* copyright (c) 2015 Anton Khirnov
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 "qsvdec.h"
typedef struct QSVH264Context {
AVClass *class;
QSVContext qsv;
// the filter for converting to Annex B
AVBitStreamFilterContext *bsf;
AVFifoBuffer *packet_fifo;
AVPacket input_ref;
AVPacket pkt_filtered;
uint8_t *filtered_data;
} QSVH264Context;
static void qsv_clear_buffers(QSVH264Context *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);
}
if (s->filtered_data != s->input_ref.data)
av_freep(&s->filtered_data);
s->filtered_data = NULL;
av_packet_unref(&s->input_ref);
}
static av_cold int qsv_decode_close(AVCodecContext *avctx)
{
QSVH264Context *s = avctx->priv_data;
ff_qsv_decode_close(&s->qsv);
qsv_clear_buffers(s);
av_fifo_free(s->packet_fifo);
av_bitstream_filter_close(s->bsf);
return 0;
}
static av_cold int qsv_decode_init(AVCodecContext *avctx)
{
QSVH264Context *s = avctx->priv_data;
int ret;
s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
if (!s->packet_fifo) {
ret = AVERROR(ENOMEM);
goto fail;
}
s->bsf = av_bitstream_filter_init("h264_mp4toannexb");
if (!s->bsf) {
ret = AVERROR(ENOMEM);
goto fail;
}
return 0;
fail:
qsv_decode_close(avctx);
return ret;
}
static int qsv_process_data(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *pkt)
{
QSVH264Context *s = avctx->priv_data;
int ret;
if (!s->qsv.session || AV_PIX_FMT_NONE==avctx->pix_fmt) {
ret = ff_qsv_decode_init(avctx, &s->qsv, pkt);
/* consume packet without a header */
if (AVERROR(EAGAIN)==ret)
return pkt->size;
if (ret < 0)
return ret;
}
return ff_qsv_decode(avctx, &s->qsv, frame, got_frame, pkt);
}
static int qsv_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
QSVH264Context *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) {
/* prepare the input data -- convert to Annex B if needed */
if (s->pkt_filtered.size <= 0) {
int size;
/* no more data */
if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
return avpkt->size ? avpkt->size : ff_qsv_decode(avctx, &s->qsv, frame, got_frame, avpkt);
if (s->filtered_data != s->input_ref.data)
av_freep(&s->filtered_data);
s->filtered_data = NULL;
av_packet_unref(&s->input_ref);
av_fifo_generic_read(s->packet_fifo, &s->input_ref, sizeof(s->input_ref), NULL);
ret = av_bitstream_filter_filter(s->bsf, avctx, NULL,
&s->filtered_data, &size,
s->input_ref.data, s->input_ref.size, 0);
if (ret < 0) {
s->filtered_data = s->input_ref.data;
size = s->input_ref.size;
}
s->pkt_filtered = s->input_ref;
s->pkt_filtered.data = s->filtered_data;
s->pkt_filtered.size = size;
}
ret = qsv_process_data(avctx, frame, got_frame, &s->pkt_filtered);
if (ret < 0)
return ret;
s->pkt_filtered.size -= ret;
s->pkt_filtered.data += ret;
}
return avpkt->size;
}
static void qsv_decode_flush(AVCodecContext *avctx)
{
QSVH264Context *s = avctx->priv_data;
qsv_clear_buffers(s);
}
AVHWAccel ff_h264_qsv_hwaccel = {
.name = "h264_qsv",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.pix_fmt = AV_PIX_FMT_QSV,
};
#define OFFSET(x) offsetof(QSVH264Context, 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 = "h264_qsv",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_h264_qsv_decoder = {
.name = "h264_qsv",
.long_name = NULL_IF_CONFIG_SMALL("H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (Intel Quick Sync Video acceleration)"),
.priv_data_size = sizeof(QSVH264Context),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.init = qsv_decode_init,
.decode = qsv_decode_frame,
.flush = qsv_decode_flush,
.close = qsv_decode_close,
.capabilities = CODEC_CAP_DELAY,
.priv_class = &class,
};
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