diff options
Diffstat (limited to 'libavfilter/af_aconvert.c')
| -rw-r--r-- | libavfilter/af_aconvert.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/libavfilter/af_aconvert.c b/libavfilter/af_aconvert.c new file mode 100644 index 0000000000..6dd845259e --- /dev/null +++ b/libavfilter/af_aconvert.c @@ -0,0 +1,174 @@ +/* + * 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/audioconvert.h" +#include "libavutil/avstring.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_samples(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->channel_layout = outlink->channel_layout; + + ret = ff_filter_samples(outlink, outsamplesref); + avfilter_unref_buffer(insamplesref); + return ret; +} + +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 = (const AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_samples = filter_samples, + .min_perms = AV_PERM_READ, }, + { .name = NULL}}, + .outputs = (const AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = config_output, }, + { .name = NULL}}, +}; |