98318bd87a47d57de24b615a3a8f0d2cec81490a
[libav.git] / 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 };