libavcodec/qsvdec_mpeg2.c

   1 /*
   2  * Intel MediaSDK QSV based MPEG2 decoder
   3  *
   4  * copyright (c) 2015 Anton Khirnov
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23
  24 #include <stdint.h>
  25 #include <string.h>
  26
  27 #include <mfx/mfxvideo.h>
  28
  29 #include "libavutil/common.h"
  30 #include "libavutil/fifo.h"
  31 #include "libavutil/opt.h"
  32
  33 #include "avcodec.h"
  34 #include "internal.h"
  35 #include "qsv_internal.h"
  36 #include "qsvdec.h"
  37 #include "qsv.h"
  38
  39 typedef struct QSVMPEG2Context {
  40     AVClass *class;
  41     QSVContext qsv;
  42
  43     AVFifoBuffer *packet_fifo;
  44
  45     AVPacket input_ref;
  46 } QSVMPEG2Context;
  47
  48 static void qsv_clear_buffers(QSVMPEG2Context *s)
  49 {
  50     AVPacket pkt;
  51     while (av_fifo_size(s->packet_fifo) >= sizeof(pkt)) {
  52         av_fifo_generic_read(s->packet_fifo, &pkt, sizeof(pkt), NULL);
  53         av_packet_unref(&pkt);
  54     }
  55
  56     av_packet_unref(&s->input_ref);
  57 }
  58
  59 static av_cold int qsv_decode_close(AVCodecContext *avctx)
  60 {
  61     QSVMPEG2Context *s = avctx->priv_data;
  62
  63     ff_qsv_decode_close(&s->qsv);
  64
  65     qsv_clear_buffers(s);
  66
  67     av_fifo_free(s->packet_fifo);
  68
  69     return 0;
  70 }
  71
  72 static av_cold int qsv_decode_init(AVCodecContext *avctx)
  73 {
  74     QSVMPEG2Context *s = avctx->priv_data;
  75     int ret;
  76
  77     s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
  78     if (!s->packet_fifo) {
  79         ret = AVERROR(ENOMEM);
  80         goto fail;
  81     }
  82
  83     s->qsv.iopattern = MFX_IOPATTERN_OUT_SYSTEM_MEMORY;
  84
  85     return 0;
  86 fail:
  87     qsv_decode_close(avctx);
  88     return ret;
  89 }
  90
  91 static int qsv_decode_frame(AVCodecContext *avctx, void *data,
  92                             int *got_frame, AVPacket *avpkt)
  93 {
  94     QSVMPEG2Context *s = avctx->priv_data;
  95     AVFrame *frame    = data;
  96     int ret;
  97
  98     /* buffer the input packet */
  99     if (avpkt->size) {
 100         AVPacket input_ref = { 0 };
 101
 102         if (av_fifo_space(s->packet_fifo) < sizeof(input_ref)) {
 103             ret = av_fifo_realloc2(s->packet_fifo,
 104                                    av_fifo_size(s->packet_fifo) + sizeof(input_ref));
 105             if (ret < 0)
 106                 return ret;
 107         }
 108
 109         ret = av_packet_ref(&input_ref, avpkt);
 110         if (ret < 0)
 111             return ret;
 112         av_fifo_generic_write(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
 113     }
 114
 115     /* process buffered data */
 116     while (!*got_frame) {
 117         if (s->input_ref.size <= 0) {
 118             /* no more data */
 119             if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
 120                 return avpkt->size ? avpkt->size : ff_qsv_process_data(avctx, &s->qsv, frame, got_frame, avpkt);
 121
 122             av_packet_unref(&s->input_ref);
 123             av_fifo_generic_read(s->packet_fifo, &s->input_ref, sizeof(s->input_ref), NULL);
 124         }
 125
 126         ret = ff_qsv_process_data(avctx, &s->qsv, frame, got_frame, &s->input_ref);
 127         if (ret < 0)
 128             return ret;
 129
 130         s->input_ref.size -= ret;
 131         s->input_ref.data += ret;
 132     }
 133
 134     return avpkt->size;
 135 }
 136
 137 static void qsv_decode_flush(AVCodecContext *avctx)
 138 {
 139     QSVMPEG2Context *s = avctx->priv_data;
 140
 141     qsv_clear_buffers(s);
 142     ff_qsv_decode_flush(avctx, &s->qsv);
 143 }
 144
 145 AVHWAccel ff_mpeg2_qsv_hwaccel = {
 146     .name           = "mpeg2_qsv",
 147     .type           = AVMEDIA_TYPE_VIDEO,
 148     .id             = AV_CODEC_ID_MPEG2VIDEO,
 149     .pix_fmt        = AV_PIX_FMT_QSV,
 150 };
 151
 152 #define OFFSET(x) offsetof(QSVMPEG2Context, x)
 153 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
 154 static const AVOption options[] = {
 155     { "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 },
 156     { NULL },
 157 };
 158
 159 static const AVClass class = {
 160     .class_name = "mpeg2_qsv",
 161     .item_name  = av_default_item_name,
 162     .option     = options,
 163     .version    = LIBAVUTIL_VERSION_INT,
 164 };
 165
 166 AVCodec ff_mpeg2_qsv_decoder = {
 167     .name           = "mpeg2_qsv",
 168     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-2 video (Intel Quick Sync Video acceleration)"),
 169     .priv_data_size = sizeof(QSVMPEG2Context),
 170     .type           = AVMEDIA_TYPE_VIDEO,
 171     .id             = AV_CODEC_ID_MPEG2VIDEO,
 172     .init           = qsv_decode_init,
 173     .decode         = qsv_decode_frame,
 174     .flush          = qsv_decode_flush,
 175     .close          = qsv_decode_close,
 176     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_DR1,
 177     .priv_class     = &class,
 178 };