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- /*
- * Copyright (c) Stefano Sabatini | stefasab at gmail.com
- * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
- *
- * 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
- */
- #include "libavutil/avassert.h"
- #include "libavutil/channel_layout.h"
- #include "libavutil/common.h"
- #include "libavcodec/avcodec.h"
- #include "audio.h"
- #include "avfilter.h"
- #include "internal.h"
- int avfilter_ref_get_channels(AVFilterBufferRef *ref)
- {
- return ref->audio ? ref->audio->channels : 0;
- }
- AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
- {
- return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
- }
- AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
- {
- AVFrame *frame = av_frame_alloc();
- int channels = link->channels;
- int ret;
- av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout));
- if (!frame)
- return NULL;
- frame->nb_samples = nb_samples;
- frame->format = link->format;
- av_frame_set_channels(frame, link->channels);
- frame->channel_layout = link->channel_layout;
- frame->sample_rate = link->sample_rate;
- ret = av_frame_get_buffer(frame, 0);
- if (ret < 0) {
- av_frame_free(&frame);
- return NULL;
- }
- av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,
- link->format);
- return frame;
- }
- AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
- {
- AVFrame *ret = NULL;
- if (link->dstpad->get_audio_buffer)
- ret = link->dstpad->get_audio_buffer(link, nb_samples);
- if (!ret)
- ret = ff_default_get_audio_buffer(link, nb_samples);
- return ret;
- }
- #if FF_API_AVFILTERBUFFER
- AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
- int linesize,int perms,
- int nb_samples,
- enum AVSampleFormat sample_fmt,
- int channels,
- uint64_t channel_layout)
- {
- int planes;
- AVFilterBuffer *samples = av_mallocz(sizeof(*samples));
- AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
- if (!samples || !samplesref)
- goto fail;
- av_assert0(channels);
- av_assert0(channel_layout == 0 ||
- channels == av_get_channel_layout_nb_channels(channel_layout));
- samplesref->buf = samples;
- samplesref->buf->free = ff_avfilter_default_free_buffer;
- if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
- goto fail;
- samplesref->audio->nb_samples = nb_samples;
- samplesref->audio->channel_layout = channel_layout;
- samplesref->audio->channels = channels;
- planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
- /* make sure the buffer gets read permission or it's useless for output */
- samplesref->perms = perms | AV_PERM_READ;
- samples->refcount = 1;
- samplesref->type = AVMEDIA_TYPE_AUDIO;
- samplesref->format = sample_fmt;
- memcpy(samples->data, data,
- FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
- memcpy(samplesref->data, samples->data, sizeof(samples->data));
- samples->linesize[0] = samplesref->linesize[0] = linesize;
- if (planes > FF_ARRAY_ELEMS(samples->data)) {
- samples-> extended_data = av_mallocz_array(sizeof(*samples->extended_data),
- planes);
- samplesref->extended_data = av_mallocz_array(sizeof(*samplesref->extended_data),
- planes);
- if (!samples->extended_data || !samplesref->extended_data)
- goto fail;
- memcpy(samples-> extended_data, data, sizeof(*data)*planes);
- memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
- } else {
- samples->extended_data = samples->data;
- samplesref->extended_data = samplesref->data;
- }
- samplesref->pts = AV_NOPTS_VALUE;
- return samplesref;
- fail:
- if (samples && samples->extended_data != samples->data)
- av_freep(&samples->extended_data);
- if (samplesref) {
- av_freep(&samplesref->audio);
- if (samplesref->extended_data != samplesref->data)
- av_freep(&samplesref->extended_data);
- }
- av_freep(&samplesref);
- av_freep(&samples);
- return NULL;
- }
- AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
- int linesize,int perms,
- int nb_samples,
- enum AVSampleFormat sample_fmt,
- uint64_t channel_layout)
- {
- int channels = av_get_channel_layout_nb_channels(channel_layout);
- return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
- nb_samples, sample_fmt,
- channels, channel_layout);
- }
- #endif
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