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 "davs2.h"
27
28 typedef struct DAVS2Context {
29 void *decoder;
30
31 AVFrame *frame;
32 davs2_param_t param; // decoding parameters
33 davs2_packet_t packet; // input bitstream
34
35 davs2_picture_t out_frame; // output data, frame data
36 davs2_seq_info_t headerset; // output data, sequence header
37
38 }DAVS2Context;
39
davs2_init(AVCodecContext * avctx)40 static av_cold int davs2_init(AVCodecContext *avctx)
41 {
42 DAVS2Context *cad = avctx->priv_data;
43 int cpu_flags = av_get_cpu_flags();
44
45 /* init the decoder */
46 cad->param.threads = avctx->thread_count;
47 cad->param.info_level = 0;
48 cad->param.disable_avx = !(cpu_flags & AV_CPU_FLAG_AVX &&
49 cpu_flags & AV_CPU_FLAG_AVX2);
50 cad->decoder = davs2_decoder_open(&cad->param);
51
52 if (!cad->decoder) {
53 av_log(avctx, AV_LOG_ERROR, "decoder created error.");
54 return AVERROR_EXTERNAL;
55 }
56
57 av_log(avctx, AV_LOG_VERBOSE, "decoder created. %p\n", cad->decoder);
58 return 0;
59 }
60
davs2_dump_frames(AVCodecContext * avctx,davs2_picture_t * pic,int * got_frame,davs2_seq_info_t * headerset,int ret_type,AVFrame * frame)61 static int davs2_dump_frames(AVCodecContext *avctx, davs2_picture_t *pic, int *got_frame,
62 davs2_seq_info_t *headerset, int ret_type, AVFrame *frame)
63 {
64 DAVS2Context *cad = avctx->priv_data;
65 int bytes_per_sample = pic->bytes_per_sample;
66 int plane = 0;
67 int line = 0;
68
69 if (!headerset) {
70 *got_frame = 0;
71 return 0;
72 }
73
74 if (!pic || ret_type == DAVS2_GOT_HEADER) {
75 avctx->width = headerset->width;
76 avctx->height = headerset->height;
77 avctx->pix_fmt = headerset->output_bit_depth == 10 ?
78 AV_PIX_FMT_YUV420P10 : AV_PIX_FMT_YUV420P;
79
80 avctx->framerate = av_d2q(headerset->frame_rate,4096);
81 *got_frame = 0;
82 return 0;
83 }
84
85 switch (pic->type) {
86 case DAVS2_PIC_I:
87 case DAVS2_PIC_G:
88 frame->pict_type = AV_PICTURE_TYPE_I;
89 break;
90 case DAVS2_PIC_P:
91 case DAVS2_PIC_S:
92 frame->pict_type = AV_PICTURE_TYPE_P;
93 break;
94 case DAVS2_PIC_B:
95 frame->pict_type = AV_PICTURE_TYPE_B;
96 break;
97 case DAVS2_PIC_F:
98 frame->pict_type = AV_PICTURE_TYPE_S;
99 break;
100 default:
101 av_log(avctx, AV_LOG_ERROR, "Decoder error: unknown frame type\n");
102 return AVERROR_EXTERNAL;
103 }
104
105 for (plane = 0; plane < 3; ++plane) {
106 int size_line = pic->widths[plane] * bytes_per_sample;
107 frame->buf[plane] = av_buffer_alloc(size_line * pic->lines[plane]);
108
109 if (!frame->buf[plane]){
110 av_log(avctx, AV_LOG_ERROR, "Decoder error: allocation failure, can't dump frames.\n");
111 return AVERROR(ENOMEM);
112 }
113
114 frame->data[plane] = frame->buf[plane]->data;
115 frame->linesize[plane] = size_line;
116
117 for (line = 0; line < pic->lines[plane]; ++line)
118 memcpy(frame->data[plane] + line * size_line,
119 pic->planes[plane] + line * pic->strides[plane],
120 pic->widths[plane] * bytes_per_sample);
121 }
122
123 frame->width = cad->headerset.width;
124 frame->height = cad->headerset.height;
125 frame->pts = cad->out_frame.pts;
126 frame->format = avctx->pix_fmt;
127
128 *got_frame = 1;
129 return 0;
130 }
131
davs2_flush(AVCodecContext * avctx)132 static void davs2_flush(AVCodecContext *avctx)
133 {
134 DAVS2Context *cad = avctx->priv_data;
135 int ret = DAVS2_GOT_FRAME;
136
137 while (ret == DAVS2_GOT_FRAME) {
138 ret = davs2_decoder_flush(cad->decoder, &cad->headerset, &cad->out_frame);
139 davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
140 }
141
142 if (ret == DAVS2_ERROR) {
143 av_log(avctx, AV_LOG_WARNING, "Decoder flushing failed.\n");
144 }
145 }
146
send_delayed_frame(AVCodecContext * avctx,AVFrame * frame,int * got_frame)147 static int send_delayed_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
148 {
149 DAVS2Context *cad = avctx->priv_data;
150 int ret = DAVS2_DEFAULT;
151
152 ret = davs2_decoder_flush(cad->decoder, &cad->headerset, &cad->out_frame);
153 if (ret == DAVS2_ERROR) {
154 av_log(avctx, AV_LOG_ERROR, "Decoder error: can't flush delayed frame\n");
155 return AVERROR_EXTERNAL;
156 }
157 if (ret == DAVS2_GOT_FRAME) {
158 ret = davs2_dump_frames(avctx, &cad->out_frame, got_frame, &cad->headerset, ret, frame);
159 davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
160 }
161 return ret;
162 }
163
davs2_end(AVCodecContext * avctx)164 static av_cold int davs2_end(AVCodecContext *avctx)
165 {
166 DAVS2Context *cad = avctx->priv_data;
167
168 /* close the decoder */
169 if (cad->decoder) {
170 davs2_decoder_close(cad->decoder);
171 cad->decoder = NULL;
172 }
173
174 return 0;
175 }
176
davs2_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)177 static int davs2_decode_frame(AVCodecContext *avctx, void *data,
178 int *got_frame, AVPacket *avpkt)
179 {
180 DAVS2Context *cad = avctx->priv_data;
181 int buf_size = avpkt->size;
182 uint8_t *buf_ptr = avpkt->data;
183 AVFrame *frame = data;
184 int ret = DAVS2_DEFAULT;
185
186 /* end of stream, output what is still in the buffers */
187 if (!buf_size) {
188 return send_delayed_frame(avctx, frame, got_frame);
189 }
190
191 cad->packet.data = buf_ptr;
192 cad->packet.len = buf_size;
193 cad->packet.pts = avpkt->pts;
194 cad->packet.dts = avpkt->dts;
195
196 ret = davs2_decoder_send_packet(cad->decoder, &cad->packet);
197
198
199 if (ret == DAVS2_ERROR) {
200 av_log(avctx, AV_LOG_ERROR, "Decoder error: can't read packet\n");
201 return AVERROR_EXTERNAL;
202 }
203
204 ret = davs2_decoder_recv_frame(cad->decoder, &cad->headerset, &cad->out_frame);
205
206 if (ret != DAVS2_DEFAULT) {
207 ret = davs2_dump_frames(avctx, &cad->out_frame, got_frame, &cad->headerset, ret, frame);
208 davs2_decoder_frame_unref(cad->decoder, &cad->out_frame);
209 }
210
211 return ret == 0 ? buf_size : ret;
212 }
213
214 AVCodec ff_libdavs2_decoder = {
215 .name = "libdavs2",
216 .long_name = NULL_IF_CONFIG_SMALL("libdavs2 AVS2-P2/IEEE1857.4"),
217 .type = AVMEDIA_TYPE_VIDEO,
218 .id = AV_CODEC_ID_AVS2,
219 .priv_data_size = sizeof(DAVS2Context),
220 .init = davs2_init,
221 .close = davs2_end,
222 .decode = davs2_decode_frame,
223 .flush = davs2_flush,
224 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,
225 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
226 AV_PIX_FMT_NONE },
227 .wrapper_name = "libdavs2",
228 };
229