| 1 | /* |
| 2 | * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram <smeenaks@ucsd.edu> |
| 3 | * Copyright (c) 2011 Stefano Sabatini |
| 4 | * Copyright (c) 2011 Mina Nagy Zaki |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * @file |
| 25 | * sample format and channel layout conversion audio filter |
| 26 | */ |
| 27 | |
| 28 | #include "libavutil/channel_layout.h" |
| 29 | #include "libavutil/opt.h" |
| 30 | #include "libswresample/swresample.h" |
| 31 | #include "avfilter.h" |
| 32 | #include "audio.h" |
| 33 | #include "internal.h" |
| 34 | |
| 35 | typedef struct { |
| 36 | const AVClass *class; |
| 37 | enum AVSampleFormat out_sample_fmt; |
| 38 | int64_t out_chlayout; |
| 39 | struct SwrContext *swr; |
| 40 | char *format_str; |
| 41 | char *channel_layout_str; |
| 42 | } AConvertContext; |
| 43 | |
| 44 | #define OFFSET(x) offsetof(AConvertContext, x) |
| 45 | #define A AV_OPT_FLAG_AUDIO_PARAM |
| 46 | #define F AV_OPT_FLAG_FILTERING_PARAM |
| 47 | static const AVOption aconvert_options[] = { |
| 48 | { "sample_fmt", "", OFFSET(format_str), AV_OPT_TYPE_STRING, .flags = A|F }, |
| 49 | { "channel_layout", "", OFFSET(channel_layout_str), AV_OPT_TYPE_STRING, .flags = A|F }, |
| 50 | { NULL } |
| 51 | }; |
| 52 | |
| 53 | AVFILTER_DEFINE_CLASS(aconvert); |
| 54 | |
| 55 | static av_cold int init(AVFilterContext *ctx) |
| 56 | { |
| 57 | AConvertContext *aconvert = ctx->priv; |
| 58 | int ret = 0; |
| 59 | |
| 60 | av_log(ctx, AV_LOG_WARNING, "This filter is deprecated, use aformat instead\n"); |
| 61 | |
| 62 | aconvert->out_sample_fmt = AV_SAMPLE_FMT_NONE; |
| 63 | aconvert->out_chlayout = 0; |
| 64 | |
| 65 | if (aconvert->format_str && strcmp(aconvert->format_str, "auto") && |
| 66 | (ret = ff_parse_sample_format(&aconvert->out_sample_fmt, aconvert->format_str, ctx)) < 0) |
| 67 | return ret; |
| 68 | if (aconvert->channel_layout_str && strcmp(aconvert->channel_layout_str, "auto")) |
| 69 | return ff_parse_channel_layout(&aconvert->out_chlayout, NULL, aconvert->channel_layout_str, ctx); |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static av_cold void uninit(AVFilterContext *ctx) |
| 74 | { |
| 75 | AConvertContext *aconvert = ctx->priv; |
| 76 | swr_free(&aconvert->swr); |
| 77 | } |
| 78 | |
| 79 | static int query_formats(AVFilterContext *ctx) |
| 80 | { |
| 81 | AVFilterFormats *formats = NULL; |
| 82 | AConvertContext *aconvert = ctx->priv; |
| 83 | AVFilterLink *inlink = ctx->inputs[0]; |
| 84 | AVFilterLink *outlink = ctx->outputs[0]; |
| 85 | AVFilterChannelLayouts *layouts; |
| 86 | |
| 87 | ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO), |
| 88 | &inlink->out_formats); |
| 89 | if (aconvert->out_sample_fmt != AV_SAMPLE_FMT_NONE) { |
| 90 | formats = NULL; |
| 91 | ff_add_format(&formats, aconvert->out_sample_fmt); |
| 92 | ff_formats_ref(formats, &outlink->in_formats); |
| 93 | } else |
| 94 | ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO), |
| 95 | &outlink->in_formats); |
| 96 | |
| 97 | ff_channel_layouts_ref(ff_all_channel_layouts(), |
| 98 | &inlink->out_channel_layouts); |
| 99 | if (aconvert->out_chlayout != 0) { |
| 100 | layouts = NULL; |
| 101 | ff_add_channel_layout(&layouts, aconvert->out_chlayout); |
| 102 | ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts); |
| 103 | } else |
| 104 | ff_channel_layouts_ref(ff_all_channel_layouts(), |
| 105 | &outlink->in_channel_layouts); |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int config_output(AVFilterLink *outlink) |
| 111 | { |
| 112 | int ret; |
| 113 | AVFilterContext *ctx = outlink->src; |
| 114 | AVFilterLink *inlink = ctx->inputs[0]; |
| 115 | AConvertContext *aconvert = ctx->priv; |
| 116 | char buf1[64], buf2[64]; |
| 117 | |
| 118 | /* if not specified in args, use the format and layout of the output */ |
| 119 | if (aconvert->out_sample_fmt == AV_SAMPLE_FMT_NONE) |
| 120 | aconvert->out_sample_fmt = outlink->format; |
| 121 | if (aconvert->out_chlayout == 0) |
| 122 | aconvert->out_chlayout = outlink->channel_layout; |
| 123 | |
| 124 | aconvert->swr = swr_alloc_set_opts(aconvert->swr, |
| 125 | aconvert->out_chlayout, aconvert->out_sample_fmt, inlink->sample_rate, |
| 126 | inlink->channel_layout, inlink->format, inlink->sample_rate, |
| 127 | 0, ctx); |
| 128 | if (!aconvert->swr) |
| 129 | return AVERROR(ENOMEM); |
| 130 | ret = swr_init(aconvert->swr); |
| 131 | if (ret < 0) |
| 132 | return ret; |
| 133 | |
| 134 | av_get_channel_layout_string(buf1, sizeof(buf1), |
| 135 | -1, inlink ->channel_layout); |
| 136 | av_get_channel_layout_string(buf2, sizeof(buf2), |
| 137 | -1, outlink->channel_layout); |
| 138 | av_log(ctx, AV_LOG_VERBOSE, |
| 139 | "fmt:%s cl:%s -> fmt:%s cl:%s\n", |
| 140 | av_get_sample_fmt_name(inlink ->format), buf1, |
| 141 | av_get_sample_fmt_name(outlink->format), buf2); |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static int filter_frame(AVFilterLink *inlink, AVFrame *insamplesref) |
| 147 | { |
| 148 | AConvertContext *aconvert = inlink->dst->priv; |
| 149 | const int n = insamplesref->nb_samples; |
| 150 | AVFilterLink *const outlink = inlink->dst->outputs[0]; |
| 151 | AVFrame *outsamplesref = ff_get_audio_buffer(outlink, n); |
| 152 | int ret; |
| 153 | |
| 154 | if (!outsamplesref) |
| 155 | return AVERROR(ENOMEM); |
| 156 | swr_convert(aconvert->swr, outsamplesref->extended_data, n, |
| 157 | (void *)insamplesref->extended_data, n); |
| 158 | |
| 159 | av_frame_copy_props(outsamplesref, insamplesref); |
| 160 | av_frame_set_channels(outsamplesref, outlink->channels); |
| 161 | outsamplesref->channel_layout = outlink->channel_layout; |
| 162 | |
| 163 | ret = ff_filter_frame(outlink, outsamplesref); |
| 164 | av_frame_free(&insamplesref); |
| 165 | return ret; |
| 166 | } |
| 167 | |
| 168 | static const AVFilterPad aconvert_inputs[] = { |
| 169 | { |
| 170 | .name = "default", |
| 171 | .type = AVMEDIA_TYPE_AUDIO, |
| 172 | .filter_frame = filter_frame, |
| 173 | }, |
| 174 | { NULL } |
| 175 | }; |
| 176 | |
| 177 | static const AVFilterPad aconvert_outputs[] = { |
| 178 | { |
| 179 | .name = "default", |
| 180 | .type = AVMEDIA_TYPE_AUDIO, |
| 181 | .config_props = config_output, |
| 182 | }, |
| 183 | { NULL } |
| 184 | }; |
| 185 | |
| 186 | AVFilter ff_af_aconvert = { |
| 187 | .name = "aconvert", |
| 188 | .description = NULL_IF_CONFIG_SMALL("Convert the input audio to sample_fmt:channel_layout."), |
| 189 | .priv_size = sizeof(AConvertContext), |
| 190 | .priv_class = &aconvert_class, |
| 191 | .init = init, |
| 192 | .uninit = uninit, |
| 193 | .query_formats = query_formats, |
| 194 | .inputs = aconvert_inputs, |
| 195 | .outputs = aconvert_outputs, |
| 196 | }; |