1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
#ifndef DEBUG
#define DEBUG 1
#endif
#include "video_decode.h"
#include <libavutil/avutil.h>
#include <libavutil/error.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
struct video_frame_priv {
struct video_frame base;
AVFrame *frame;
};
struct video_decode_priv {
struct video_decode base;
AVFormatContext *fmt_ctx;
AVCodecContext *codec_ctx;
AVCodec *codec;
int stream;
};
int
video_decode_init(struct video_decode **vd_out, char *file, int64_t ts)
{
struct video_decode_priv *vd;
vd = calloc(1, sizeof *vd);
if (vd == NULL)
return -1;
av_register_all();
#if DEBUG == 0
av_log_set_level(AV_LOG_QUIET);
#endif
vd->fmt_ctx = NULL;
vd->codec_ctx = NULL;
if (avformat_open_input(&vd->fmt_ctx, file, NULL, NULL) != 0)
return -1;
if (avformat_find_stream_info(vd->fmt_ctx, NULL) < 0)
return -2;
#if DEBUG
av_dump_format(vd->fmt_ctx, 0, file, 0);
#endif
vd->stream = av_find_best_stream(vd->fmt_ctx, AVMEDIA_TYPE_VIDEO,
-1, -1, NULL, 0);
if (vd->stream == -1)
return -3;
vd->codec_ctx = vd->fmt_ctx->streams[vd->stream]->codec;
if (vd->fmt_ctx->start_time != AV_NOPTS_VALUE)
ts += vd->fmt_ctx->start_time;
/* FIXME: Check size */
avformat_seek_file(vd->fmt_ctx, vd->stream, INT64_MIN, ts, INT64_MAX,0);
vd->codec = avcodec_find_decoder(vd->codec_ctx->codec_id);
if (vd->codec == NULL) {
fprintf(stderr, "Failed to find decoder!\n");
return -4;
}
#if DEBUG
printf("has cap truncated: %d\n",
vd->codec->capabilities & CODEC_CAP_TRUNCATED);
#endif
#if 0
if (codec->capabilities & CODEC_CAP_TRUNCATED)
codec_ctx->flags |= CODEC_FLAG_TRUNCATED;
#endif
if (avcodec_open2(vd->codec_ctx, vd->codec, NULL) < 0) {
fprintf(stderr, "Failed to open codec!\n");
return -5;
}
vd->base.duration = vd->fmt_ctx->streams[vd->stream]->duration;
*vd_out = &vd->base;
return 0;
}
void
video_decode_uninit(struct video_decode **_vd)
{
struct video_decode_priv *vd = (struct video_decode_priv *) *_vd;
*_vd = NULL;
avcodec_close(vd->codec_ctx);
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53, 17, 0)
avformat_close_input(&vd->fmt_ctx);
#else
av_close_input_file(vd->fmt_ctx);
#endif
free(vd);
}
int
video_decode_seek(struct video_decode *_vd, int64_t timestamp)
{
struct video_decode_priv *vd = (struct video_decode_priv *) _vd;
if (vd->fmt_ctx->start_time != AV_NOPTS_VALUE)
timestamp += vd->fmt_ctx->start_time;
return avformat_seek_file(vd->fmt_ctx, vd->stream,
INT64_MIN, timestamp, INT64_MAX,0);
}
int
video_decode_get_frame(struct video_decode *_vd, struct video_frame **frame)
{
struct video_decode_priv *vd = (struct video_decode_priv *) _vd;
struct video_frame_priv *f;
AVPacket packet;
int decoded, got_picture = 0;
int ret;
if (*frame != NULL) {
f = (struct video_frame_priv *) *frame;
} else {
f = calloc(1, sizeof *f);
if (f == NULL)
return -1;
f->frame = avcodec_alloc_frame();
}
packet.data = NULL;
do {
ret = av_read_frame(vd->fmt_ctx, &packet);
if (ret < 0) {
if (ret == AVERROR_EOF) {
return 0;
}
#if DEBUG
else {
char buf[BUFSIZ];
av_strerror(ret, buf, BUFSIZ);
fprintf(stderr,
"Failed to read frame: %s\n", buf);
}
#endif
return -1;
}
if (packet.stream_index == vd->stream) {
#if DEBUG
printf("packet.data: %p, packet.siz: %d, packet.strm_idx: %d\n",
packet.data, packet.size, packet.stream_index);
#endif
decoded = avcodec_decode_video2(vd->codec_ctx, f->frame,
&got_picture, &packet);
if (decoded < 0) {
fprintf(stderr, "Error while decoding frame!\n");
av_free_packet(&packet);
return -2;
}
#if DEBUG
printf("bytes_decoded: %d, got_picture: %d\n",
decoded, got_picture);
#endif
}
av_free_packet(&packet);
} while (got_picture == 0);
f->base.data = f->frame->data[0];
f->base.width = vd->codec_ctx->width;
f->base.height = vd->codec_ctx->height;
f->base.stride = f->frame->linesize[0];
f->base.dts = vd->fmt_ctx->streams[vd->stream]->cur_dts;
if (*frame == NULL)
*frame = &f->base;
return 1;
}
void
video_decode_free_frame(struct video_frame **frame)
{
struct video_frame_priv *f = (struct video_frame_priv *) *frame;
*frame = NULL;
av_free(f->frame);
free(f);
}
|
