FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/pcm.c
Date: 2024-03-29 11:55:30
Exec Total Coverage
Lines: 34 40 85.0%
Functions: 3 3 100.0%
Branches: 18 28 64.3%

Line Branch Exec Source
1 /*
2 * PCM common functions
3 * Copyright (c) 2003 Fabrice Bellard
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 "libavutil/mathematics.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "pcm.h"
26
27 #define PCM_DEMUX_TARGET_FPS 10
28
29 4514 int ff_pcm_default_packet_size(AVCodecParameters *par)
30 {
31 int nb_samples, max_samples, bits_per_sample;
32 int64_t bitrate;
33
34
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4514 if (par->block_align <= 0)
35 return AVERROR(EINVAL);
36
37 4514 max_samples = INT_MAX / par->block_align;
38 4514 bits_per_sample = av_get_bits_per_sample(par->codec_id);
39 4514 bitrate = par->bit_rate;
40
41 /* Don't trust the codecpar bitrate if we can calculate it ourselves */
42
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4514 if (bits_per_sample > 0 && par->sample_rate > 0 && par->ch_layout.nb_channels > 0)
43
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4501 if ((int64_t)par->sample_rate * par->ch_layout.nb_channels < INT64_MAX / bits_per_sample)
44 4501 bitrate = bits_per_sample * par->sample_rate * par->ch_layout.nb_channels;
45
46
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4514 if (bitrate > 0) {
47 4514 nb_samples = av_clip64(bitrate / 8 / PCM_DEMUX_TARGET_FPS / par->block_align, 1, max_samples);
48 4514 nb_samples = 1 << av_log2(nb_samples);
49 } else {
50 /* Fallback to a size based method for a non-pcm codec with unknown bitrate */
51 nb_samples = av_clip(4096 / par->block_align, 1, max_samples);
52 }
53
54 4514 return par->block_align * nb_samples;
55 }
56
57 3974 int ff_pcm_read_packet(AVFormatContext *s, AVPacket *pkt)
58 {
59 int ret, size;
60
61 3974 size = ff_pcm_default_packet_size(s->streams[0]->codecpar);
62
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3974 if (size < 0)
63 return size;
64
65 3974 ret = av_get_packet(s->pb, pkt, size);
66
67 3974 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
68 3974 pkt->stream_index = 0;
69
70 3974 return ret;
71 }
72
73 616 int ff_pcm_read_seek(AVFormatContext *s,
74 int stream_index, int64_t timestamp, int flags)
75 {
76 AVStream *st;
77 int block_align, byte_rate;
78 int64_t pos, ret;
79
80 616 st = s->streams[0];
81
82
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616 block_align = st->codecpar->block_align ? st->codecpar->block_align :
83 (av_get_bits_per_sample(st->codecpar->codec_id) * st->codecpar->ch_layout.nb_channels) >> 3;
84
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616 byte_rate = st->codecpar->bit_rate ? st->codecpar->bit_rate >> 3 :
85 block_align * st->codecpar->sample_rate;
86
87
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616 if (block_align <= 0 || byte_rate <= 0)
88 return -1;
89
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616 if (timestamp < 0) timestamp = 0;
90
91 /* compute the position by aligning it to block_align */
92 616 pos = av_rescale_rnd(timestamp * byte_rate,
93 616 st->time_base.num,
94 616 st->time_base.den * (int64_t)block_align,
95
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616 (flags & AVSEEK_FLAG_BACKWARD) ? AV_ROUND_DOWN : AV_ROUND_UP);
96 616 pos *= block_align;
97
98 /* recompute exact position */
99 616 ffstream(st)->cur_dts = av_rescale(pos, st->time_base.den, byte_rate * (int64_t)st->time_base.num);
100
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616 if ((ret = avio_seek(s->pb, pos + ffformatcontext(s)->data_offset, SEEK_SET)) < 0)
101 14 return ret;
102 602 return 0;
103 }
104