lavc: add Intel libmfx-based MPEG2 decoder.

configure

@@ -1922,6 +1922,8 @@ mpeg1video_decoder_select="error_resilience mpeg_er mpegvideo"
 mpeg1video_encoder_select="aandcttables mpegvideoenc"
 mpeg2video_decoder_select="error_resilience mpeg_er mpegvideo"
 mpeg2video_encoder_select="aandcttables mpegvideoenc"
+mpeg2_qsv_decoder_deps="libmfx"
+mpeg2_qsv_decoder_select="qsvdec mpeg2_qsv_hwaccel mpegvideo_parser"
 mpeg2_qsv_encoder_deps="libmfx"
 mpeg2_qsv_encoder_select="qsvenc"
 mpeg4_decoder_select="h263_decoder mpeg4video_parser"
@@ -2049,6 +2051,7 @@ mpeg2_d3d11va_hwaccel_deps="d3d11va"
 mpeg2_d3d11va_hwaccel_select="mpeg2video_decoder"
 mpeg2_dxva2_hwaccel_deps="dxva2"
 mpeg2_dxva2_hwaccel_select="mpeg2video_decoder"
+mpeg2_qsv_hwaccel_deps="libmfx"
 mpeg2_vaapi_hwaccel_deps="vaapi"
 mpeg2_vaapi_hwaccel_select="mpeg2video_decoder"
 mpeg2_vdpau_hwaccel_deps="vdpau"

libavcodec/Makefile

@@ -307,6 +307,7 @@ OBJS-$(CONFIG_MPEG1VIDEO_DECODER)      += mpeg12dec.o mpeg12.o mpeg12data.o
 OBJS-$(CONFIG_MPEG1VIDEO_ENCODER)      += mpeg12enc.o mpeg12.o
 OBJS-$(CONFIG_MPEG2VIDEO_DECODER)      += mpeg12dec.o mpeg12.o mpeg12data.o
 OBJS-$(CONFIG_MPEG2VIDEO_ENCODER)      += mpeg12enc.o mpeg12.o
+OBJS-$(CONFIG_MPEG2_QSV_DECODER)       += qsvdec_mpeg2.o
 OBJS-$(CONFIG_MPEG2_QSV_ENCODER)       += qsvenc_mpeg2.o
 OBJS-$(CONFIG_MPEG4_DECODER)           += xvididct.o
 OBJS-$(CONFIG_MSMPEG4V1_DECODER)       += msmpeg4dec.o msmpeg4.o msmpeg4data.o

libavcodec/allcodecs.c

@@ -89,6 +89,7 @@ void avcodec_register_all(void)
     REGISTER_HWACCEL(MPEG1_VDPAU,       mpeg1_vdpau);
     REGISTER_HWACCEL(MPEG2_D3D11VA,     mpeg2_d3d11va);
     REGISTER_HWACCEL(MPEG2_DXVA2,       mpeg2_dxva2);
+    REGISTER_HWACCEL(MPEG2_QSV,         mpeg2_qsv);
     REGISTER_HWACCEL(MPEG2_VAAPI,       mpeg2_vaapi);
     REGISTER_HWACCEL(MPEG2_VDPAU,       mpeg2_vdpau);
     REGISTER_HWACCEL(MPEG4_VAAPI,       mpeg4_vaapi);
@@ -203,6 +204,7 @@ void avcodec_register_all(void)
 #endif /* FF_API_XVMC */
     REGISTER_ENCDEC (MPEG1VIDEO,        mpeg1video);
     REGISTER_ENCDEC (MPEG2VIDEO,        mpeg2video);
+    REGISTER_DECODER(MPEG2_QSV,         mpeg2_qsv);
     REGISTER_ENCDEC (MPEG4,             mpeg4);
     REGISTER_DECODER(MSA1,              msa1);
     REGISTER_DECODER(MSMPEG4V1,         msmpeg4v1);

libavcodec/qsvdec_mpeg2.c

+/*
+ * 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) {
+        /* prepare the input data -- convert to Annex B if needed */
+        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,
+    .priv_class     = &class,
+};