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1 /*
2  * AVS2 decoding using the davs2 library
3  *
4  * Copyright (C) 2018 Yiqun Xu, <yiqun.xu@vipl.ict.ac.cn>
5  *                    Falei Luo, <falei.luo@gmail.com>
6  *                    Huiwen Ren, <hwrenx@gmail.com>
7  *
8  * This file is part of FFmpeg.
9  *
10  * FFmpeg is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public
12  * License as published by the Free Software Foundation; either
13  * version 2.1 of the License, or (at your option) any later version.
14  *
15  * FFmpeg is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * Lesser General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public
21  * License along with FFmpeg; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
25 #include "avcodec.h"
26 #include "internal.h"
27 #include "davs2.h"
28 
29 typedef struct DAVS2Context {
30     void *decoder;
31 
32     AVFrame *frame;
33     davs2_param_t    param;      // decoding parameters
34     davs2_packet_t   packet;     // input bitstream
35 
36     davs2_picture_t  out_frame;  // output data, frame data
37     davs2_seq_info_t headerset;  // output data, sequence header
38 
39 }DAVS2Context;
40 
davs2_init(AVCodecContext * avctx)41 static av_cold int davs2_init(AVCodecContext *avctx)
42 {
43     DAVS2Context *cad = avctx->priv_data;
44     int cpu_flags = av_get_cpu_flags();
45 
46     /* init the decoder */
47     cad->param.threads      = avctx->thread_count;
48     cad->param.info_level   = 0;
49     cad->param.disable_avx  = !(cpu_flags & AV_CPU_FLAG_AVX &&
50                                 cpu_flags & AV_CPU_FLAG_AVX2);
51     cad->decoder            = davs2_decoder_open(&cad->param);
52 
53     if (!cad->decoder) {
54         av_log(avctx, AV_LOG_ERROR, "decoder created error.");
55         return AVERROR_EXTERNAL;
56     }
57 
58     av_log(avctx, AV_LOG_VERBOSE, "decoder created. %p\n", cad->decoder);
59     return 0;
60 }
61 
davs2_dump_frames(AVCodecContext * avctx,davs2_picture_t * pic,int * got_frame,davs2_seq_info_t * headerset,int ret_type,AVFrame * frame)62 static int davs2_dump_frames(AVCodecContext *avctx, davs2_picture_t *pic, int *got_frame,
63                              davs2_seq_info_t *headerset, int ret_type, AVFrame *frame)
64 {
65     DAVS2Context *cad    = avctx->priv_data;
66     int bytes_per_sample = pic->bytes_per_sample;
67     int plane = 0;
68     int line  = 0;
69 
70     if (!headerset) {
71         *got_frame = 0;
72         return 0;
73     }
74 
75     if (!pic || ret_type == DAVS2_GOT_HEADER) {
76         avctx->width     = headerset->width;
77         avctx->height    = headerset->height;
78         avctx->pix_fmt   = headerset->output_bit_depth == 10 ?
79                            AV_PIX_FMT_YUV420P10 : AV_PIX_FMT_YUV420P;
80 
81         avctx->framerate = av_d2q(headerset->frame_rate,4096);
82         *got_frame = 0;
83         return 0;
84     }
85 
86     switch (pic->type) {
87     case DAVS2_PIC_I:
88     case DAVS2_PIC_G:
89         frame->pict_type = AV_PICTURE_TYPE_I;
90         break;
91     case DAVS2_PIC_P:
92     case DAVS2_PIC_S:
93         frame->pict_type = AV_PICTURE_TYPE_P;
94         break;
95     case DAVS2_PIC_B:
96         frame->pict_type = AV_PICTURE_TYPE_B;
97         break;
98     case DAVS2_PIC_F:
99         frame->pict_type = AV_PICTURE_TYPE_S;
100         break;
101     default:
102         av_log(avctx, AV_LOG_ERROR, "Decoder error: unknown frame type\n");
103         return AVERROR_EXTERNAL;
104     }
105 
106     for (plane = 0; plane < 3; ++plane) {
107         int size_line = pic->widths[plane] * bytes_per_sample;
108         frame->buf[plane]  = av_buffer_alloc(size_line * pic->lines[plane]);
109 
110         if (!frame->buf[plane]){
111             av_log(avctx, AV_LOG_ERROR, "Decoder error: allocation failure, can't dump frames.\n");
112             return AVERROR(ENOMEM);
113         }
114 
115         frame->data[plane]     = frame->buf[plane]->data;
116         frame->linesize[plane] = size_line;
117 
118         for (line = 0; line < pic->lines[plane]; ++line)
119             memcpy(frame->data[plane] + line * size_line,
120                    pic->planes[plane] + line * pic->strides[plane],
121                    pic->widths[plane] * bytes_per_sample);
122     }
123 
124     frame->width     = cad->headerset.width;
125     frame->height    = cad->headerset.height;
126     frame->pts       = cad->out_frame.pts;
127     frame->format    = avctx->pix_fmt;
128 
129     *got_frame = 1;
130     return 0;
131 }
132 
davs2_flush(AVCodecContext * avctx)133 static void davs2_flush(AVCodecContext *avctx)
134 {
135     DAVS2Context *cad      = avctx->priv_data;
136     int           ret      = DAVS2_GOT_FRAME;
137 
138     while (ret == DAVS2_GOT_FRAME) {
139         ret = davs2_decoder_flush(cad->decoder, &cad->headerset, &cad->out_frame);
140         davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
141     }
142 
143     if (ret == DAVS2_ERROR) {
144         av_log(avctx, AV_LOG_WARNING, "Decoder flushing failed.\n");
145     }
146 }
147 
send_delayed_frame(AVCodecContext * avctx,AVFrame * frame,int * got_frame)148 static int send_delayed_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
149 {
150     DAVS2Context *cad      = avctx->priv_data;
151     int           ret      = DAVS2_DEFAULT;
152 
153     ret = davs2_decoder_flush(cad->decoder, &cad->headerset, &cad->out_frame);
154     if (ret == DAVS2_ERROR) {
155         av_log(avctx, AV_LOG_ERROR, "Decoder error: can't flush delayed frame\n");
156         return AVERROR_EXTERNAL;
157     }
158     if (ret == DAVS2_GOT_FRAME) {
159         ret = davs2_dump_frames(avctx, &cad->out_frame, got_frame, &cad->headerset, ret, frame);
160         davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
161     }
162     return ret;
163 }
164 
davs2_end(AVCodecContext * avctx)165 static av_cold int davs2_end(AVCodecContext *avctx)
166 {
167     DAVS2Context *cad = avctx->priv_data;
168 
169     /* close the decoder */
170     if (cad->decoder) {
171         davs2_decoder_close(cad->decoder);
172         cad->decoder = NULL;
173     }
174 
175     return 0;
176 }
177 
davs2_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)178 static int davs2_decode_frame(AVCodecContext *avctx, void *data,
179                               int *got_frame, AVPacket *avpkt)
180 {
181     DAVS2Context *cad      = avctx->priv_data;
182     int           buf_size = avpkt->size;
183     uint8_t      *buf_ptr  = avpkt->data;
184     AVFrame      *frame    = data;
185     int           ret      = DAVS2_DEFAULT;
186 
187     /* end of stream, output what is still in the buffers */
188     if (!buf_size) {
189         return send_delayed_frame(avctx, frame, got_frame);
190     }
191 
192     cad->packet.data = buf_ptr;
193     cad->packet.len  = buf_size;
194     cad->packet.pts  = avpkt->pts;
195     cad->packet.dts  = avpkt->dts;
196 
197     ret = davs2_decoder_send_packet(cad->decoder, &cad->packet);
198 
199 
200     if (ret == DAVS2_ERROR) {
201         av_log(avctx, AV_LOG_ERROR, "Decoder error: can't read packet\n");
202         return AVERROR_EXTERNAL;
203     }
204 
205     ret = davs2_decoder_recv_frame(cad->decoder, &cad->headerset, &cad->out_frame);
206 
207     if (ret != DAVS2_DEFAULT) {
208         ret = davs2_dump_frames(avctx, &cad->out_frame, got_frame, &cad->headerset, ret, frame);
209         davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
210     }
211 
212     return ret == 0 ? buf_size : ret;
213 }
214 
215 AVCodec ff_libdavs2_decoder = {
216     .name           = "libdavs2",
217     .long_name      = NULL_IF_CONFIG_SMALL("libdavs2 AVS2-P2/IEEE1857.4"),
218     .type           = AVMEDIA_TYPE_VIDEO,
219     .id             = AV_CODEC_ID_AVS2,
220     .priv_data_size = sizeof(DAVS2Context),
221     .init           = davs2_init,
222     .close          = davs2_end,
223     .decode         = davs2_decode_frame,
224     .flush          = davs2_flush,
225     .capabilities   =  AV_CODEC_CAP_DELAY | AV_CODEC_CAP_OTHER_THREADS,
226     .caps_internal  = FF_CODEC_CAP_AUTO_THREADS,
227     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
228                                                      AV_PIX_FMT_NONE },
229     .wrapper_name   = "libdavs2",
230 };
231