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1 | /* |
2 | * Copyright (c) 2014 Stefano Sabatini | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
5 | * of this software and associated documentation files (the "Software"), to deal | |
6 | * in the Software without restriction, including without limitation the rights | |
7 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
8 | * copies of the Software, and to permit persons to whom the Software is | |
9 | * furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
18 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
19 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
20 | * THE SOFTWARE. | |
21 | */ | |
22 | ||
23 | /** | |
24 | * @file | |
25 | * libavformat AVIOContext API example. | |
26 | * | |
27 | * Make libavformat demuxer access media content through a custom | |
28 | * AVIOContext read callback. | |
29 | * @example avio_reading.c | |
30 | */ | |
31 | ||
32 | #include <libavcodec/avcodec.h> | |
33 | #include <libavformat/avformat.h> | |
34 | #include <libavformat/avio.h> | |
35 | #include <libavutil/file.h> | |
36 | ||
37 | struct buffer_data { | |
38 | uint8_t *ptr; | |
39 | size_t size; ///< size left in the buffer | |
40 | }; | |
41 | ||
42 | static int read_packet(void *opaque, uint8_t *buf, int buf_size) | |
43 | { | |
44 | struct buffer_data *bd = (struct buffer_data *)opaque; | |
45 | buf_size = FFMIN(buf_size, bd->size); | |
46 | ||
47 | printf("ptr:%p size:%zu\n", bd->ptr, bd->size); | |
48 | ||
49 | /* copy internal buffer data to buf */ | |
50 | memcpy(buf, bd->ptr, buf_size); | |
51 | bd->ptr += buf_size; | |
52 | bd->size -= buf_size; | |
53 | ||
54 | return buf_size; | |
55 | } | |
56 | ||
57 | int main(int argc, char *argv[]) | |
58 | { | |
59 | AVFormatContext *fmt_ctx = NULL; | |
60 | AVIOContext *avio_ctx = NULL; | |
61 | uint8_t *buffer = NULL, *avio_ctx_buffer = NULL; | |
62 | size_t buffer_size, avio_ctx_buffer_size = 4096; | |
63 | char *input_filename = NULL; | |
64 | int ret = 0; | |
65 | struct buffer_data bd = { 0 }; | |
66 | ||
67 | if (argc != 2) { | |
68 | fprintf(stderr, "usage: %s input_file\n" | |
69 | "API example program to show how to read from a custom buffer " | |
70 | "accessed through AVIOContext.\n", argv[0]); | |
71 | return 1; | |
72 | } | |
73 | input_filename = argv[1]; | |
74 | ||
75 | /* register codecs and formats and other lavf/lavc components*/ | |
76 | av_register_all(); | |
77 | ||
78 | /* slurp file content into buffer */ | |
79 | ret = av_file_map(input_filename, &buffer, &buffer_size, 0, NULL); | |
80 | if (ret < 0) | |
81 | goto end; | |
82 | ||
83 | /* fill opaque structure used by the AVIOContext read callback */ | |
84 | bd.ptr = buffer; | |
85 | bd.size = buffer_size; | |
86 | ||
87 | if (!(fmt_ctx = avformat_alloc_context())) { | |
88 | ret = AVERROR(ENOMEM); | |
89 | goto end; | |
90 | } | |
91 | ||
92 | avio_ctx_buffer = av_malloc(avio_ctx_buffer_size); | |
93 | if (!avio_ctx_buffer) { | |
94 | ret = AVERROR(ENOMEM); | |
95 | goto end; | |
96 | } | |
97 | avio_ctx = avio_alloc_context(avio_ctx_buffer, avio_ctx_buffer_size, | |
98 | 0, &bd, &read_packet, NULL, NULL); | |
99 | if (!avio_ctx) { | |
100 | ret = AVERROR(ENOMEM); | |
101 | goto end; | |
102 | } | |
103 | fmt_ctx->pb = avio_ctx; | |
104 | ||
105 | ret = avformat_open_input(&fmt_ctx, NULL, NULL, NULL); | |
106 | if (ret < 0) { | |
107 | fprintf(stderr, "Could not open input\n"); | |
108 | goto end; | |
109 | } | |
110 | ||
111 | ret = avformat_find_stream_info(fmt_ctx, NULL); | |
112 | if (ret < 0) { | |
113 | fprintf(stderr, "Could not find stream information\n"); | |
114 | goto end; | |
115 | } | |
116 | ||
117 | av_dump_format(fmt_ctx, 0, input_filename, 0); | |
118 | ||
119 | end: | |
120 | avformat_close_input(&fmt_ctx); | |
121 | /* note: the internal buffer could have changed, and be != avio_ctx_buffer */ | |
122 | if (avio_ctx) { | |
123 | av_freep(&avio_ctx->buffer); | |
124 | av_freep(&avio_ctx); | |
125 | } | |
126 | av_file_unmap(buffer, buffer_size); | |
127 | ||
128 | if (ret < 0) { | |
129 | fprintf(stderr, "Error occurred: %s\n", av_err2str(ret)); | |
130 | return 1; | |
131 | } | |
132 | ||
133 | return 0; | |
134 | } |