1 /*
2 * OpenH264 video decoder
3 * Copyright (C) 2016 Martin Storsjo
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include <wels/codec_api.h>
23 #include <wels/codec_ver.h>
24
25 #include "libavutil/common.h"
26 #include "libavutil/fifo.h"
27 #include "libavutil/imgutils.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/opt.h"
31
32 #include "avcodec.h"
33 #include "internal.h"
34 #include "libopenh264.h"
35
36 typedef struct SVCContext {
37 ISVCDecoder *decoder;
38 } SVCContext;
39
svc_decode_close(AVCodecContext * avctx)40 static av_cold int svc_decode_close(AVCodecContext *avctx)
41 {
42 SVCContext *s = avctx->priv_data;
43
44 if (s->decoder)
45 WelsDestroyDecoder(s->decoder);
46
47 return 0;
48 }
49
svc_decode_init(AVCodecContext * avctx)50 static av_cold int svc_decode_init(AVCodecContext *avctx)
51 {
52 SVCContext *s = avctx->priv_data;
53 SDecodingParam param = { 0 };
54 int err;
55 int log_level;
56 WelsTraceCallback callback_function;
57
58 if ((err = ff_libopenh264_check_version(avctx)) < 0)
59 return err;
60
61 if (WelsCreateDecoder(&s->decoder)) {
62 av_log(avctx, AV_LOG_ERROR, "Unable to create decoder\n");
63 return AVERROR_UNKNOWN;
64 }
65
66 // Pass all libopenh264 messages to our callback, to allow ourselves to filter them.
67 log_level = WELS_LOG_DETAIL;
68 callback_function = ff_libopenh264_trace_callback;
69 (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_LEVEL, &log_level);
70 (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK, (void *)&callback_function);
71 (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK_CONTEXT, (void *)&avctx);
72
73 #if !OPENH264_VER_AT_LEAST(1, 6)
74 param.eOutputColorFormat = videoFormatI420;
75 #endif
76 param.eEcActiveIdc = ERROR_CON_DISABLE;
77 param.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_DEFAULT;
78
79 if ((*s->decoder)->Initialize(s->decoder, ¶m) != cmResultSuccess) {
80 av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
81 return AVERROR_UNKNOWN;
82 }
83
84 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
85
86 return 0;
87 }
88
svc_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)89 static int svc_decode_frame(AVCodecContext *avctx, void *data,
90 int *got_frame, AVPacket *avpkt)
91 {
92 SVCContext *s = avctx->priv_data;
93 SBufferInfo info = { 0 };
94 uint8_t* ptrs[3];
95 int ret, linesize[3];
96 AVFrame *avframe = data;
97 DECODING_STATE state;
98 #if OPENH264_VER_AT_LEAST(1, 7)
99 int opt;
100 #endif
101
102 if (!avpkt->data) {
103 #if OPENH264_VER_AT_LEAST(1, 9)
104 int end_of_stream = 1;
105 (*s->decoder)->SetOption(s->decoder, DECODER_OPTION_END_OF_STREAM, &end_of_stream);
106 state = (*s->decoder)->FlushFrame(s->decoder, ptrs, &info);
107 #else
108 return 0;
109 #endif
110 } else {
111 info.uiInBsTimeStamp = avpkt->pts;
112 #if OPENH264_VER_AT_LEAST(1, 4)
113 // Contrary to the name, DecodeFrameNoDelay actually does buffering
114 // and reordering of frames, and is the recommended decoding entry
115 // point since 1.4. This is essential for successfully decoding
116 // B-frames.
117 state = (*s->decoder)->DecodeFrameNoDelay(s->decoder, avpkt->data, avpkt->size, ptrs, &info);
118 #else
119 state = (*s->decoder)->DecodeFrame2(s->decoder, avpkt->data, avpkt->size, ptrs, &info);
120 #endif
121 }
122 if (state != dsErrorFree) {
123 av_log(avctx, AV_LOG_ERROR, "DecodeFrame failed\n");
124 return AVERROR_UNKNOWN;
125 }
126 if (info.iBufferStatus != 1) {
127 av_log(avctx, AV_LOG_DEBUG, "No frame produced\n");
128 return avpkt->size;
129 }
130
131 ret = ff_set_dimensions(avctx, info.UsrData.sSystemBuffer.iWidth, info.UsrData.sSystemBuffer.iHeight);
132 if (ret < 0)
133 return ret;
134 // The decoder doesn't (currently) support decoding into a user
135 // provided buffer, so do a copy instead.
136 if (ff_get_buffer(avctx, avframe, 0) < 0) {
137 av_log(avctx, AV_LOG_ERROR, "Unable to allocate buffer\n");
138 return AVERROR(ENOMEM);
139 }
140
141 linesize[0] = info.UsrData.sSystemBuffer.iStride[0];
142 linesize[1] = linesize[2] = info.UsrData.sSystemBuffer.iStride[1];
143 av_image_copy(avframe->data, avframe->linesize, (const uint8_t **) ptrs, linesize, avctx->pix_fmt, avctx->width, avctx->height);
144
145 avframe->pts = info.uiOutYuvTimeStamp;
146 avframe->pkt_dts = AV_NOPTS_VALUE;
147 #if FF_API_PKT_PTS
148 FF_DISABLE_DEPRECATION_WARNINGS
149 avframe->pkt_pts = avpkt->pts;
150 FF_ENABLE_DEPRECATION_WARNINGS
151 #endif
152 #if OPENH264_VER_AT_LEAST(1, 7)
153 (*s->decoder)->GetOption(s->decoder, DECODER_OPTION_PROFILE, &opt);
154 avctx->profile = opt;
155 (*s->decoder)->GetOption(s->decoder, DECODER_OPTION_LEVEL, &opt);
156 avctx->level = opt;
157 #endif
158
159 *got_frame = 1;
160 return avpkt->size;
161 }
162
163 AVCodec ff_libopenh264_decoder = {
164 .name = "libopenh264",
165 .long_name = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
166 .type = AVMEDIA_TYPE_VIDEO,
167 .id = AV_CODEC_ID_H264,
168 .priv_data_size = sizeof(SVCContext),
169 .init = svc_decode_init,
170 .decode = svc_decode_frame,
171 .close = svc_decode_close,
172 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
173 .caps_internal = FF_CODEC_CAP_SETS_PKT_DTS | FF_CODEC_CAP_INIT_THREADSAFE |
174 FF_CODEC_CAP_INIT_CLEANUP,
175 .bsfs = "h264_mp4toannexb",
176 .wrapper_name = "libopenh264",
177 };
178