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/* |
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* ALSA input and output |
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* Copyright (c) 2007 Luca Abeni ( lucabe72 email it ) |
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* Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr ) |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
24 |
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* @file |
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* ALSA input and output: common code |
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* @author Luca Abeni ( lucabe72 email it ) |
27 |
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* @author Benoit Fouet ( benoit fouet free fr ) |
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* @author Nicolas George ( nicolas george normalesup org ) |
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*/ |
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#include <alsa/asoundlib.h> |
32 |
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#include "avdevice.h" |
33 |
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#include "libavutil/avassert.h" |
34 |
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#include "libavutil/channel_layout.h" |
35 |
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36 |
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#include "alsa.h" |
37 |
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38 |
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static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id) |
39 |
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{ |
40 |
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switch(codec_id) { |
41 |
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case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE; |
42 |
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case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE; |
43 |
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case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE; |
44 |
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case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE; |
45 |
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case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE; |
46 |
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case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE; |
47 |
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case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE; |
48 |
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case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE; |
49 |
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case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE; |
50 |
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case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE; |
51 |
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case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE; |
52 |
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case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE; |
53 |
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case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE; |
54 |
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case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE; |
55 |
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case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE; |
56 |
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case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE; |
57 |
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case AV_CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8; |
58 |
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case AV_CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8; |
59 |
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case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW; |
60 |
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case AV_CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW; |
61 |
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default: return SND_PCM_FORMAT_UNKNOWN; |
62 |
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} |
63 |
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} |
64 |
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65 |
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#define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP) \ |
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static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v, \ |
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void *out_v, \ |
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int n) \ |
69 |
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{ \ |
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const TYPE *in = in_v; \ |
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TYPE *out = out_v; \ |
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\ |
73 |
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while (n-- > 0) { \ |
74 |
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MAP \ |
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in += CHANNELS; \ |
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out += CHANNELS; \ |
77 |
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} \ |
78 |
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} |
79 |
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80 |
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#define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \ |
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MAKE_REORDER_FUNC(int8, int8_t, CHANNELS, LAYOUT, MAP) \ |
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MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \ |
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MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \ |
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MAKE_REORDER_FUNC(f32, float, CHANNELS, LAYOUT, MAP) |
85 |
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86 |
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MAKE_REORDER_FUNCS(5, out_50, \ |
87 |
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out[0] = in[0]; \ |
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out[1] = in[1]; \ |
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out[2] = in[3]; \ |
90 |
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out[3] = in[4]; \ |
91 |
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out[4] = in[2]; \ |
92 |
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) |
93 |
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94 |
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MAKE_REORDER_FUNCS(6, out_51, \ |
95 |
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out[0] = in[0]; \ |
96 |
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out[1] = in[1]; \ |
97 |
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out[2] = in[4]; \ |
98 |
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out[3] = in[5]; \ |
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out[4] = in[2]; \ |
100 |
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out[5] = in[3]; \ |
101 |
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) |
102 |
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103 |
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MAKE_REORDER_FUNCS(8, out_71, \ |
104 |
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out[0] = in[0]; \ |
105 |
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out[1] = in[1]; \ |
106 |
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out[2] = in[4]; \ |
107 |
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out[3] = in[5]; \ |
108 |
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out[4] = in[2]; \ |
109 |
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out[5] = in[3]; \ |
110 |
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out[6] = in[6]; \ |
111 |
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out[7] = in[7]; \ |
112 |
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) |
113 |
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114 |
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#define FORMAT_I8 0 |
115 |
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#define FORMAT_I16 1 |
116 |
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#define FORMAT_I32 2 |
117 |
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#define FORMAT_F32 3 |
118 |
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119 |
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#define PICK_REORDER(layout)\ |
120 |
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switch(format) {\ |
121 |
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case FORMAT_I8: s->reorder_func = alsa_reorder_int8_out_ ##layout; break;\ |
122 |
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case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\ |
123 |
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case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\ |
124 |
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case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout; break;\ |
125 |
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} |
126 |
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127 |
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static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out) |
128 |
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{ |
129 |
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int format; |
130 |
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131 |
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/* reordering input is not currently supported */ |
132 |
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if (!out) |
133 |
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return AVERROR(ENOSYS); |
134 |
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135 |
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/* reordering is not needed for QUAD or 2_2 layout */ |
136 |
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if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2) |
137 |
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return 0; |
138 |
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139 |
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switch (codec_id) { |
140 |
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case AV_CODEC_ID_PCM_S8: |
141 |
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case AV_CODEC_ID_PCM_U8: |
142 |
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case AV_CODEC_ID_PCM_ALAW: |
143 |
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case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8; break; |
144 |
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case AV_CODEC_ID_PCM_S16LE: |
145 |
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case AV_CODEC_ID_PCM_S16BE: |
146 |
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case AV_CODEC_ID_PCM_U16LE: |
147 |
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case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break; |
148 |
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case AV_CODEC_ID_PCM_S32LE: |
149 |
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case AV_CODEC_ID_PCM_S32BE: |
150 |
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case AV_CODEC_ID_PCM_U32LE: |
151 |
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case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break; |
152 |
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case AV_CODEC_ID_PCM_F32LE: |
153 |
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case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break; |
154 |
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default: return AVERROR(ENOSYS); |
155 |
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} |
156 |
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157 |
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if (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0) |
158 |
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PICK_REORDER(50) |
159 |
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else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1) |
160 |
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PICK_REORDER(51) |
161 |
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else if (layout == AV_CH_LAYOUT_7POINT1) |
162 |
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PICK_REORDER(71) |
163 |
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164 |
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return s->reorder_func ? 0 : AVERROR(ENOSYS); |
165 |
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} |
166 |
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167 |
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av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode, |
168 |
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unsigned int *sample_rate, |
169 |
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int channels, enum AVCodecID *codec_id) |
170 |
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{ |
171 |
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AlsaData *s = ctx->priv_data; |
172 |
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const char *audio_device; |
173 |
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int res, flags = 0; |
174 |
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snd_pcm_format_t format; |
175 |
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snd_pcm_t *h; |
176 |
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snd_pcm_hw_params_t *hw_params; |
177 |
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snd_pcm_uframes_t buffer_size, period_size; |
178 |
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uint64_t layout = ctx->streams[0]->codecpar->channel_layout; |
179 |
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180 |
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if (ctx->url[0] == 0) audio_device = "default"; |
181 |
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else audio_device = ctx->url; |
182 |
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183 |
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if (*codec_id == AV_CODEC_ID_NONE) |
184 |
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*codec_id = DEFAULT_CODEC_ID; |
185 |
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format = codec_id_to_pcm_format(*codec_id); |
186 |
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if (format == SND_PCM_FORMAT_UNKNOWN) { |
187 |
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av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id); |
188 |
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return AVERROR(ENOSYS); |
189 |
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} |
190 |
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s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels; |
191 |
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192 |
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if (ctx->flags & AVFMT_FLAG_NONBLOCK) { |
193 |
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flags = SND_PCM_NONBLOCK; |
194 |
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} |
195 |
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res = snd_pcm_open(&h, audio_device, mode, flags); |
196 |
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if (res < 0) { |
197 |
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av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n", |
198 |
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audio_device, snd_strerror(res)); |
199 |
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return AVERROR(EIO); |
200 |
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} |
201 |
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202 |
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res = snd_pcm_hw_params_malloc(&hw_params); |
203 |
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if (res < 0) { |
204 |
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av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n", |
205 |
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|
snd_strerror(res)); |
206 |
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goto fail1; |
207 |
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|
} |
208 |
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|
209 |
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res = snd_pcm_hw_params_any(h, hw_params); |
210 |
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if (res < 0) { |
211 |
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av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n", |
212 |
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snd_strerror(res)); |
213 |
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goto fail; |
214 |
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|
} |
215 |
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|
216 |
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res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); |
217 |
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if (res < 0) { |
218 |
|
|
av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n", |
219 |
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|
snd_strerror(res)); |
220 |
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goto fail; |
221 |
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|
} |
222 |
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|
223 |
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res = snd_pcm_hw_params_set_format(h, hw_params, format); |
224 |
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if (res < 0) { |
225 |
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av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n", |
226 |
|
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*codec_id, format, snd_strerror(res)); |
227 |
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goto fail; |
228 |
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|
} |
229 |
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|
230 |
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res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0); |
231 |
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|
if (res < 0) { |
232 |
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av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n", |
233 |
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|
snd_strerror(res)); |
234 |
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goto fail; |
235 |
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|
} |
236 |
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|
237 |
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res = snd_pcm_hw_params_set_channels(h, hw_params, channels); |
238 |
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if (res < 0) { |
239 |
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av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n", |
240 |
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channels, snd_strerror(res)); |
241 |
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goto fail; |
242 |
|
|
} |
243 |
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|
|
244 |
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snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size); |
245 |
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buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX); |
246 |
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/* TODO: maybe use ctx->max_picture_buffer somehow */ |
247 |
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res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size); |
248 |
|
|
if (res < 0) { |
249 |
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av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n", |
250 |
|
|
snd_strerror(res)); |
251 |
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goto fail; |
252 |
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} |
253 |
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|
254 |
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snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL); |
255 |
|
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if (!period_size) |
256 |
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period_size = buffer_size / 4; |
257 |
|
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res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL); |
258 |
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if (res < 0) { |
259 |
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av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n", |
260 |
|
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snd_strerror(res)); |
261 |
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goto fail; |
262 |
|
|
} |
263 |
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s->period_size = period_size; |
264 |
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|
265 |
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res = snd_pcm_hw_params(h, hw_params); |
266 |
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if (res < 0) { |
267 |
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av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n", |
268 |
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snd_strerror(res)); |
269 |
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goto fail; |
270 |
|
|
} |
271 |
|
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|
272 |
|
|
snd_pcm_hw_params_free(hw_params); |
273 |
|
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|
274 |
|
|
if (channels > 2 && layout) { |
275 |
|
|
if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) { |
276 |
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|
char name[128]; |
277 |
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av_get_channel_layout_string(name, sizeof(name), channels, layout); |
278 |
|
|
av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n", |
279 |
|
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name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture"); |
280 |
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|
} |
281 |
|
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if (s->reorder_func) { |
282 |
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s->reorder_buf_size = buffer_size; |
283 |
|
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s->reorder_buf = av_malloc_array(s->reorder_buf_size, s->frame_size); |
284 |
|
|
if (!s->reorder_buf) |
285 |
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goto fail1; |
286 |
|
|
} |
287 |
|
|
} |
288 |
|
|
|
289 |
|
|
s->h = h; |
290 |
|
|
return 0; |
291 |
|
|
|
292 |
|
|
fail: |
293 |
|
|
snd_pcm_hw_params_free(hw_params); |
294 |
|
|
fail1: |
295 |
|
|
snd_pcm_close(h); |
296 |
|
|
return AVERROR(EIO); |
297 |
|
|
} |
298 |
|
|
|
299 |
|
|
av_cold int ff_alsa_close(AVFormatContext *s1) |
300 |
|
|
{ |
301 |
|
|
AlsaData *s = s1->priv_data; |
302 |
|
|
|
303 |
|
|
if (snd_pcm_stream(s->h) == SND_PCM_STREAM_PLAYBACK) { |
304 |
|
|
snd_pcm_nonblock(s->h, 0); |
305 |
|
|
snd_pcm_drain(s->h); |
306 |
|
|
} |
307 |
|
|
av_freep(&s->reorder_buf); |
308 |
|
|
if (CONFIG_ALSA_INDEV) |
309 |
|
|
ff_timefilter_destroy(s->timefilter); |
310 |
|
|
snd_pcm_close(s->h); |
311 |
|
|
return 0; |
312 |
|
|
} |
313 |
|
|
|
314 |
|
|
int ff_alsa_xrun_recover(AVFormatContext *s1, int err) |
315 |
|
|
{ |
316 |
|
|
AlsaData *s = s1->priv_data; |
317 |
|
|
snd_pcm_t *handle = s->h; |
318 |
|
|
|
319 |
|
|
av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n"); |
320 |
|
|
if (err == -EPIPE) { |
321 |
|
|
err = snd_pcm_prepare(handle); |
322 |
|
|
if (err < 0) { |
323 |
|
|
av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err)); |
324 |
|
|
|
325 |
|
|
return AVERROR(EIO); |
326 |
|
|
} |
327 |
|
|
} else if (err == -ESTRPIPE) { |
328 |
|
|
av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n"); |
329 |
|
|
|
330 |
|
|
return -1; |
331 |
|
|
} |
332 |
|
|
return err; |
333 |
|
|
} |
334 |
|
|
|
335 |
|
|
int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size) |
336 |
|
|
{ |
337 |
|
|
int size = s->reorder_buf_size; |
338 |
|
|
void *r; |
339 |
|
|
|
340 |
|
|
av_assert0(size != 0); |
341 |
|
|
while (size < min_size) |
342 |
|
|
size *= 2; |
343 |
|
|
r = av_realloc_array(s->reorder_buf, size, s->frame_size); |
344 |
|
|
if (!r) |
345 |
|
|
return AVERROR(ENOMEM); |
346 |
|
|
s->reorder_buf = r; |
347 |
|
|
s->reorder_buf_size = size; |
348 |
|
|
return 0; |
349 |
|
|
} |
350 |
|
|
|
351 |
|
|
/* ported from alsa-utils/aplay.c */ |
352 |
|
|
int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type) |
353 |
|
|
{ |
354 |
|
|
int ret = 0; |
355 |
|
|
void **hints, **n; |
356 |
|
|
char *name = NULL, *descr = NULL, *io = NULL, *tmp; |
357 |
|
|
AVDeviceInfo *new_device = NULL; |
358 |
|
|
const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input"; |
359 |
|
|
|
360 |
|
|
if (snd_device_name_hint(-1, "pcm", &hints) < 0) |
361 |
|
|
return AVERROR_EXTERNAL; |
362 |
|
|
n = hints; |
363 |
|
|
while (*n && !ret) { |
364 |
|
|
name = snd_device_name_get_hint(*n, "NAME"); |
365 |
|
|
descr = snd_device_name_get_hint(*n, "DESC"); |
366 |
|
|
io = snd_device_name_get_hint(*n, "IOID"); |
367 |
|
|
if (!io || !strcmp(io, filter)) { |
368 |
|
|
new_device = av_mallocz(sizeof(AVDeviceInfo)); |
369 |
|
|
if (!new_device) { |
370 |
|
|
ret = AVERROR(ENOMEM); |
371 |
|
|
goto fail; |
372 |
|
|
} |
373 |
|
|
new_device->device_name = av_strdup(name); |
374 |
|
|
if ((tmp = strrchr(descr, '\n')) && tmp[1]) |
375 |
|
|
new_device->device_description = av_strdup(&tmp[1]); |
376 |
|
|
else |
377 |
|
|
new_device->device_description = av_strdup(descr); |
378 |
|
|
if (!new_device->device_description || !new_device->device_name) { |
379 |
|
|
ret = AVERROR(ENOMEM); |
380 |
|
|
goto fail; |
381 |
|
|
} |
382 |
|
|
if ((ret = av_dynarray_add_nofree(&device_list->devices, |
383 |
|
|
&device_list->nb_devices, new_device)) < 0) { |
384 |
|
|
goto fail; |
385 |
|
|
} |
386 |
|
|
if (!strcmp(new_device->device_name, "default")) |
387 |
|
|
device_list->default_device = device_list->nb_devices - 1; |
388 |
|
|
new_device = NULL; |
389 |
|
|
} |
390 |
|
|
fail: |
391 |
|
|
free(io); |
392 |
|
|
free(name); |
393 |
|
|
free(descr); |
394 |
|
|
n++; |
395 |
|
|
} |
396 |
|
|
if (new_device) { |
397 |
|
|
av_free(new_device->device_description); |
398 |
|
|
av_free(new_device->device_name); |
399 |
|
|
av_free(new_device); |
400 |
|
|
} |
401 |
|
|
snd_device_name_free_hint(hints); |
402 |
|
|
return ret; |
403 |
|
|
} |