| /* |
| * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram <smeenaks@ucsd.edu> |
| * Copyright (c) 2011 Stefano Sabatini |
| * Copyright (c) 2011 Mina Nagy Zaki |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * sample format and channel layout conversion audio filter |
| */ |
| |
| #include "libavutil/avstring.h" |
| #include "libavutil/channel_layout.h" |
| #include "libswresample/swresample.h" |
| #include "avfilter.h" |
| #include "audio.h" |
| #include "internal.h" |
| |
| typedef struct { |
| enum AVSampleFormat out_sample_fmt; |
| int64_t out_chlayout; |
| struct SwrContext *swr; |
| } AConvertContext; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args0) |
| { |
| AConvertContext *aconvert = ctx->priv; |
| char *arg, *ptr = NULL; |
| int ret = 0; |
| char *args = av_strdup(args0); |
| |
| aconvert->out_sample_fmt = AV_SAMPLE_FMT_NONE; |
| aconvert->out_chlayout = 0; |
| |
| if ((arg = av_strtok(args, ":", &ptr)) && strcmp(arg, "auto")) { |
| if ((ret = ff_parse_sample_format(&aconvert->out_sample_fmt, arg, ctx)) < 0) |
| goto end; |
| } |
| if ((arg = av_strtok(NULL, ":", &ptr)) && strcmp(arg, "auto")) { |
| if ((ret = ff_parse_channel_layout(&aconvert->out_chlayout, arg, ctx)) < 0) |
| goto end; |
| } |
| |
| end: |
| av_freep(&args); |
| return ret; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| AConvertContext *aconvert = ctx->priv; |
| swr_free(&aconvert->swr); |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AConvertContext *aconvert = ctx->priv; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| AVFilterChannelLayouts *layouts; |
| |
| ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO), |
| &inlink->out_formats); |
| if (aconvert->out_sample_fmt != AV_SAMPLE_FMT_NONE) { |
| formats = NULL; |
| ff_add_format(&formats, aconvert->out_sample_fmt); |
| ff_formats_ref(formats, &outlink->in_formats); |
| } else |
| ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_AUDIO), |
| &outlink->in_formats); |
| |
| ff_channel_layouts_ref(ff_all_channel_layouts(), |
| &inlink->out_channel_layouts); |
| if (aconvert->out_chlayout != 0) { |
| layouts = NULL; |
| ff_add_channel_layout(&layouts, aconvert->out_chlayout); |
| ff_channel_layouts_ref(layouts, &outlink->in_channel_layouts); |
| } else |
| ff_channel_layouts_ref(ff_all_channel_layouts(), |
| &outlink->in_channel_layouts); |
| |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| int ret; |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AConvertContext *aconvert = ctx->priv; |
| char buf1[64], buf2[64]; |
| |
| /* if not specified in args, use the format and layout of the output */ |
| if (aconvert->out_sample_fmt == AV_SAMPLE_FMT_NONE) |
| aconvert->out_sample_fmt = outlink->format; |
| if (aconvert->out_chlayout == 0) |
| aconvert->out_chlayout = outlink->channel_layout; |
| |
| aconvert->swr = swr_alloc_set_opts(aconvert->swr, |
| aconvert->out_chlayout, aconvert->out_sample_fmt, inlink->sample_rate, |
| inlink->channel_layout, inlink->format, inlink->sample_rate, |
| 0, ctx); |
| if (!aconvert->swr) |
| return AVERROR(ENOMEM); |
| ret = swr_init(aconvert->swr); |
| if (ret < 0) |
| return ret; |
| |
| av_get_channel_layout_string(buf1, sizeof(buf1), |
| -1, inlink ->channel_layout); |
| av_get_channel_layout_string(buf2, sizeof(buf2), |
| -1, outlink->channel_layout); |
| av_log(ctx, AV_LOG_VERBOSE, |
| "fmt:%s cl:%s -> fmt:%s cl:%s\n", |
| av_get_sample_fmt_name(inlink ->format), buf1, |
| av_get_sample_fmt_name(outlink->format), buf2); |
| |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamplesref) |
| { |
| AConvertContext *aconvert = inlink->dst->priv; |
| const int n = insamplesref->audio->nb_samples; |
| AVFilterLink *const outlink = inlink->dst->outputs[0]; |
| AVFilterBufferRef *outsamplesref = ff_get_audio_buffer(outlink, AV_PERM_WRITE, n); |
| int ret; |
| |
| swr_convert(aconvert->swr, outsamplesref->data, n, |
| (void *)insamplesref->data, n); |
| |
| avfilter_copy_buffer_ref_props(outsamplesref, insamplesref); |
| outsamplesref->audio->channels = outlink->channels; |
| outsamplesref->audio->channel_layout = outlink->channel_layout; |
| |
| ret = ff_filter_frame(outlink, outsamplesref); |
| avfilter_unref_buffer(insamplesref); |
| return ret; |
| } |
| |
| static const AVFilterPad aconvert_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| .min_perms = AV_PERM_READ, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad aconvert_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .config_props = config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter avfilter_af_aconvert = { |
| .name = "aconvert", |
| .description = NULL_IF_CONFIG_SMALL("Convert the input audio to sample_fmt:channel_layout."), |
| .priv_size = sizeof(AConvertContext), |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .inputs = aconvert_inputs, |
| .outputs = aconvert_outputs, |
| }; |