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1 | /* | ||
2 | * This file is part of FFmpeg. | ||
3 | * | ||
4 | * FFmpeg is free software; you can redistribute it and/or | ||
5 | * modify it under the terms of the GNU Lesser General Public | ||
6 | * License as published by the Free Software Foundation; either | ||
7 | * version 2.1 of the License, or (at your option) any later version. | ||
8 | * | ||
9 | * FFmpeg is distributed in the hope that it will be useful, | ||
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
12 | * Lesser General Public License for more details. | ||
13 | * | ||
14 | * You should have received a copy of the GNU Lesser General Public | ||
15 | * License along with FFmpeg; if not, write to the Free Software | ||
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
17 | */ | ||
18 | |||
19 | /** | ||
20 | * @file | ||
21 | * Channel split filter | ||
22 | * | ||
23 | * Split an audio stream into per-channel streams. | ||
24 | */ | ||
25 | |||
26 | #include "libavutil/attributes.h" | ||
27 | #include "libavutil/channel_layout.h" | ||
28 | #include "libavutil/internal.h" | ||
29 | #include "libavutil/mem.h" | ||
30 | #include "libavutil/opt.h" | ||
31 | |||
32 | #include "audio.h" | ||
33 | #include "avfilter.h" | ||
34 | #include "filters.h" | ||
35 | #include "formats.h" | ||
36 | #include "internal.h" | ||
37 | |||
38 | #define MAX_CH 64 | ||
39 | |||
40 | typedef struct ChannelSplitContext { | ||
41 | const AVClass *class; | ||
42 | |||
43 | AVChannelLayout channel_layout; | ||
44 | char *channels_str; | ||
45 | |||
46 | int map[64]; | ||
47 | } ChannelSplitContext; | ||
48 | |||
49 | #define OFFSET(x) offsetof(ChannelSplitContext, x) | ||
50 | #define A AV_OPT_FLAG_AUDIO_PARAM | ||
51 | #define F AV_OPT_FLAG_FILTERING_PARAM | ||
52 | static const AVOption channelsplit_options[] = { | ||
53 | { "channel_layout", "Input channel layout.", OFFSET(channel_layout), AV_OPT_TYPE_CHLAYOUT, { .str = "stereo" }, .flags = A|F }, | ||
54 | { "channels", "Channels to extract.", OFFSET(channels_str), AV_OPT_TYPE_STRING, { .str = "all" }, .flags = A|F }, | ||
55 | { NULL } | ||
56 | }; | ||
57 | |||
58 | AVFILTER_DEFINE_CLASS(channelsplit); | ||
59 | |||
60 | 2 | static av_cold int init(AVFilterContext *ctx) | |
61 | { | ||
62 | 2 | ChannelSplitContext *s = ctx->priv; | |
63 | 2 | AVChannelLayout channel_layout = { 0 }; | |
64 | 2 | int all = 0, ret = 0, i; | |
65 | |||
66 |
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2 | if (!strcmp(s->channels_str, "all")) { |
67 |
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2 | if ((ret = av_channel_layout_copy(&channel_layout, &s->channel_layout)) < 0) |
68 | ✗ | goto fail; | |
69 | 2 | all = 1; | |
70 | } else { | ||
71 | ✗ | if ((ret = av_channel_layout_from_string(&channel_layout, s->channels_str)) < 0) | |
72 | ✗ | goto fail; | |
73 | } | ||
74 | |||
75 |
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2 | if (channel_layout.nb_channels > MAX_CH) { |
76 | ✗ | av_log(ctx, AV_LOG_ERROR, "Too many channels\n"); | |
77 | ✗ | goto fail; | |
78 | } | ||
79 | |||
80 |
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6 | for (i = 0; i < channel_layout.nb_channels; i++) { |
81 | 4 | enum AVChannel channel = av_channel_layout_channel_from_index(&channel_layout, i); | |
82 | char buf[64]; | ||
83 | 4 | AVFilterPad pad = { .flags = AVFILTERPAD_FLAG_FREE_NAME }; | |
84 | |||
85 | 4 | av_channel_name(buf, sizeof(buf), channel); | |
86 | 4 | pad.type = AVMEDIA_TYPE_AUDIO; | |
87 | 4 | pad.name = av_strdup(buf); | |
88 |
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4 | if (!pad.name) { |
89 | ✗ | ret = AVERROR(ENOMEM); | |
90 | ✗ | goto fail; | |
91 | } | ||
92 | |||
93 |
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4 | if (all) { |
94 | 4 | s->map[i] = i; | |
95 | } else { | ||
96 | char buf[128]; | ||
97 | ✗ | av_channel_layout_describe(&s->channel_layout, buf, sizeof(buf)); | |
98 | ✗ | if ((ret = av_channel_layout_index_from_channel(&s->channel_layout, channel)) < 0) { | |
99 | ✗ | av_log(ctx, AV_LOG_ERROR, "Channel name '%s' not present in channel layout '%s'.\n", | |
100 | pad.name, buf); | ||
101 | ✗ | av_freep(&pad.name); | |
102 | ✗ | goto fail; | |
103 | } | ||
104 | |||
105 | ✗ | s->map[i] = ret; | |
106 | } | ||
107 | |||
108 |
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4 | if ((ret = ff_append_outpad(ctx, &pad)) < 0) |
109 | ✗ | goto fail; | |
110 | } | ||
111 | |||
112 | 2 | fail: | |
113 | 2 | av_channel_layout_uninit(&channel_layout); | |
114 | 2 | return ret; | |
115 | } | ||
116 | |||
117 | 2 | static av_cold void uninit(AVFilterContext *ctx) | |
118 | { | ||
119 | 2 | ChannelSplitContext *s = ctx->priv; | |
120 | |||
121 | 2 | av_channel_layout_uninit(&s->channel_layout); | |
122 | 2 | } | |
123 | |||
124 | 1 | static int query_formats(AVFilterContext *ctx) | |
125 | { | ||
126 | 1 | ChannelSplitContext *s = ctx->priv; | |
127 | 1 | AVFilterChannelLayouts *in_layouts = NULL; | |
128 | int i, ret; | ||
129 | |||
130 |
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2 | if ((ret = ff_set_common_formats(ctx, ff_planar_sample_fmts())) < 0 || |
131 | 1 | (ret = ff_set_common_all_samplerates(ctx)) < 0) | |
132 | ✗ | return ret; | |
133 | |||
134 |
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2 | if ((ret = ff_add_channel_layout(&in_layouts, &s->channel_layout)) < 0 || |
135 | 1 | (ret = ff_channel_layouts_ref(in_layouts, &ctx->inputs[0]->outcfg.channel_layouts)) < 0) | |
136 | ✗ | return ret; | |
137 | |||
138 |
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3 | for (i = 0; i < ctx->nb_outputs; i++) { |
139 | 2 | AVChannelLayout channel_layout = { 0 }; | |
140 | 2 | AVFilterChannelLayouts *out_layouts = NULL; | |
141 | 2 | enum AVChannel channel = av_channel_layout_channel_from_index(&s->channel_layout, s->map[i]); | |
142 | |||
143 |
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4 | if ((ret = av_channel_layout_from_mask(&channel_layout, 1ULL << channel)) < 0 || |
144 |
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4 | (ret = ff_add_channel_layout(&out_layouts, &channel_layout)) < 0 || |
145 | 2 | (ret = ff_channel_layouts_ref(out_layouts, &ctx->outputs[i]->incfg.channel_layouts)) < 0) | |
146 | ✗ | return ret; | |
147 | } | ||
148 | |||
149 | 1 | return 0; | |
150 | } | ||
151 | |||
152 | 518 | static int filter_frame(AVFilterLink *outlink, AVFrame *buf) | |
153 | { | ||
154 | 518 | AVFilterContext *ctx = outlink->src; | |
155 | 518 | ChannelSplitContext *s = ctx->priv; | |
156 | 518 | const int i = FF_OUTLINK_IDX(outlink); | |
157 | 518 | enum AVChannel channel = av_channel_layout_channel_from_index(&buf->ch_layout, s->map[i]); | |
158 | int ret; | ||
159 | |||
160 | 518 | AVFrame *buf_out = av_frame_clone(buf); | |
161 |
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518 | if (!buf_out) |
162 | ✗ | return AVERROR(ENOMEM); | |
163 | |||
164 | 518 | buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]]; | |
165 | 518 | ret = av_channel_layout_from_mask(&buf_out->ch_layout, 1ULL << channel); | |
166 |
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518 | if (ret < 0) { |
167 | ✗ | av_frame_free(&buf_out); | |
168 | ✗ | return ret; | |
169 | } | ||
170 | |||
171 | 518 | return ff_filter_frame(ctx->outputs[i], buf_out); | |
172 | } | ||
173 | |||
174 | 519 | static int activate(AVFilterContext *ctx) | |
175 | { | ||
176 | 519 | AVFilterLink *inlink = ctx->inputs[0]; | |
177 | int status, ret; | ||
178 | AVFrame *in; | ||
179 | int64_t pts; | ||
180 | |||
181 |
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1557 | for (int i = 0; i < ctx->nb_outputs; i++) { |
182 |
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1038 | FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx); |
183 | } | ||
184 | |||
185 | 519 | ret = ff_inlink_consume_frame(inlink, &in); | |
186 |
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519 | if (ret < 0) |
187 | ✗ | return ret; | |
188 |
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519 | if (ret > 0) { |
189 |
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777 | for (int i = 0; i < ctx->nb_outputs; i++) { |
190 |
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518 | if (ff_outlink_get_status(ctx->outputs[i])) |
191 | ✗ | continue; | |
192 | |||
193 | 518 | ret = filter_frame(ctx->outputs[i], in); | |
194 |
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518 | if (ret < 0) |
195 | ✗ | break; | |
196 | } | ||
197 | |||
198 | 259 | av_frame_free(&in); | |
199 |
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259 | if (ret < 0) |
200 | ✗ | return ret; | |
201 | } | ||
202 | |||
203 |
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519 | if (ff_inlink_acknowledge_status(inlink, &status, &pts)) { |
204 |
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3 | for (int i = 0; i < ctx->nb_outputs; i++) { |
205 |
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2 | if (ff_outlink_get_status(ctx->outputs[i])) |
206 | ✗ | continue; | |
207 | 2 | ff_outlink_set_status(ctx->outputs[i], status, pts); | |
208 | } | ||
209 | 1 | return 0; | |
210 | } | ||
211 | |||
212 |
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1036 | for (int i = 0; i < ctx->nb_outputs; i++) { |
213 |
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777 | if (ff_outlink_get_status(ctx->outputs[i])) |
214 | ✗ | continue; | |
215 | |||
216 |
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777 | if (ff_outlink_frame_wanted(ctx->outputs[i])) { |
217 | 259 | ff_inlink_request_frame(inlink); | |
218 | 259 | return 0; | |
219 | } | ||
220 | } | ||
221 | |||
222 | 259 | return FFERROR_NOT_READY; | |
223 | } | ||
224 | |||
225 | const AVFilter ff_af_channelsplit = { | ||
226 | .name = "channelsplit", | ||
227 | .description = NULL_IF_CONFIG_SMALL("Split audio into per-channel streams."), | ||
228 | .priv_size = sizeof(ChannelSplitContext), | ||
229 | .priv_class = &channelsplit_class, | ||
230 | .init = init, | ||
231 | .activate = activate, | ||
232 | .uninit = uninit, | ||
233 | FILTER_INPUTS(ff_audio_default_filterpad), | ||
234 | .outputs = NULL, | ||
235 | FILTER_QUERY_FUNC(query_formats), | ||
236 | .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS, | ||
237 | }; | ||
238 |