yading@10: /*
yading@10:  * Copyright (c) Stefano Sabatini | stefasab at gmail.com
yading@10:  * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavcodec/avcodec.h"
yading@10: 
yading@10: #include "audio.h"
yading@10: #include "avfilter.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: int avfilter_ref_get_channels(AVFilterBufferRef *ref)
yading@10: {
yading@10:     return ref->audio ? ref->audio->channels : 0;
yading@10: }
yading@10: 
yading@10: AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
yading@10: {
yading@10:     return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
yading@10: }
yading@10: 
yading@10: AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
yading@10: {
yading@10:     AVFrame *frame = av_frame_alloc();
yading@10:     int channels = link->channels;
yading@10:     int buf_size, ret;
yading@10: 
yading@10:     av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout));
yading@10: 
yading@10:     if (!frame)
yading@10:         return NULL;
yading@10: 
yading@10:     buf_size = av_samples_get_buffer_size(NULL, channels, nb_samples,
yading@10:                                           link->format, 0);
yading@10:     if (buf_size < 0)
yading@10:         goto fail;
yading@10: 
yading@10:     frame->buf[0] = av_buffer_alloc(buf_size);
yading@10:     if (!frame->buf[0])
yading@10:         goto fail;
yading@10: 
yading@10:     frame->nb_samples = nb_samples;
yading@10:     ret = avcodec_fill_audio_frame(frame, channels, link->format,
yading@10:                                    frame->buf[0]->data, buf_size, 0);
yading@10:     if (ret < 0)
yading@10:         goto fail;
yading@10: 
yading@10:     av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,
yading@10:                            link->format);
yading@10: 
yading@10:     frame->nb_samples     = nb_samples;
yading@10:     frame->format         = link->format;
yading@10:     av_frame_set_channels(frame, link->channels);
yading@10:     frame->channel_layout = link->channel_layout;
yading@10:     frame->sample_rate    = link->sample_rate;
yading@10: 
yading@10:     return frame;
yading@10: 
yading@10: fail:
yading@10:     av_buffer_unref(&frame->buf[0]);
yading@10:     av_frame_free(&frame);
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
yading@10: {
yading@10:     AVFrame *ret = NULL;
yading@10: 
yading@10:     if (link->dstpad->get_audio_buffer)
yading@10:         ret = link->dstpad->get_audio_buffer(link, nb_samples);
yading@10: 
yading@10:     if (!ret)
yading@10:         ret = ff_default_get_audio_buffer(link, nb_samples);
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: #if FF_API_AVFILTERBUFFER
yading@10: AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
yading@10:                                                                       int linesize,int perms,
yading@10:                                                                       int nb_samples,
yading@10:                                                                       enum AVSampleFormat sample_fmt,
yading@10:                                                                       int channels,
yading@10:                                                                       uint64_t channel_layout)
yading@10: {
yading@10:     int planes;
yading@10:     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
yading@10:     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
yading@10: 
yading@10:     if (!samples || !samplesref)
yading@10:         goto fail;
yading@10: 
yading@10:     av_assert0(channels);
yading@10:     av_assert0(channel_layout == 0 ||
yading@10:                channels == av_get_channel_layout_nb_channels(channel_layout));
yading@10: 
yading@10:     samplesref->buf         = samples;
yading@10:     samplesref->buf->free   = ff_avfilter_default_free_buffer;
yading@10:     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
yading@10:         goto fail;
yading@10: 
yading@10:     samplesref->audio->nb_samples     = nb_samples;
yading@10:     samplesref->audio->channel_layout = channel_layout;
yading@10:     samplesref->audio->channels       = channels;
yading@10: 
yading@10:     planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
yading@10: 
yading@10:     /* make sure the buffer gets read permission or it's useless for output */
yading@10:     samplesref->perms = perms | AV_PERM_READ;
yading@10: 
yading@10:     samples->refcount  = 1;
yading@10:     samplesref->type   = AVMEDIA_TYPE_AUDIO;
yading@10:     samplesref->format = sample_fmt;
yading@10: 
yading@10:     memcpy(samples->data, data,
yading@10:            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
yading@10:     memcpy(samplesref->data, samples->data, sizeof(samples->data));
yading@10: 
yading@10:     samples->linesize[0] = samplesref->linesize[0] = linesize;
yading@10: 
yading@10:     if (planes > FF_ARRAY_ELEMS(samples->data)) {
yading@10:         samples->   extended_data = av_mallocz(sizeof(*samples->extended_data) *
yading@10:                                                planes);
yading@10:         samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
yading@10:                                                planes);
yading@10: 
yading@10:         if (!samples->extended_data || !samplesref->extended_data)
yading@10:             goto fail;
yading@10: 
yading@10:         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
yading@10:         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
yading@10:     } else {
yading@10:         samples->extended_data    = samples->data;
yading@10:         samplesref->extended_data = samplesref->data;
yading@10:     }
yading@10: 
yading@10:     samplesref->pts = AV_NOPTS_VALUE;
yading@10: 
yading@10:     return samplesref;
yading@10: 
yading@10: fail:
yading@10:     if (samples && samples->extended_data != samples->data)
yading@10:         av_freep(&samples->extended_data);
yading@10:     if (samplesref) {
yading@10:         av_freep(&samplesref->audio);
yading@10:         if (samplesref->extended_data != samplesref->data)
yading@10:             av_freep(&samplesref->extended_data);
yading@10:     }
yading@10:     av_freep(&samplesref);
yading@10:     av_freep(&samples);
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
yading@10:                                                              int linesize,int perms,
yading@10:                                                              int nb_samples,
yading@10:                                                              enum AVSampleFormat sample_fmt,
yading@10:                                                              uint64_t channel_layout)
yading@10: {
yading@10:     int channels = av_get_channel_layout_nb_channels(channel_layout);
yading@10:     return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
yading@10:                                                               nb_samples, sample_fmt,
yading@10:                                                               channels, channel_layout);
yading@10: }
yading@10: #endif