2 * Copyright (c) Stefano Sabatini | stefasab at gmail.com
3 * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avassert.h"
23 #include "libavutil/audioconvert.h"
29 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
32 return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
35 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
38 AVFilterBufferRef *samplesref = NULL;
40 int planar = av_sample_fmt_is_planar(link->format);
41 int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
42 int planes = planar ? nb_channels : 1;
45 if (!(data = av_mallocz(sizeof(*data) * planes)))
48 if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
51 samplesref = avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
52 nb_samples, link->format,
53 link->channel_layout);
66 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
69 AVFilterBufferRef *ret = NULL;
71 if (link->dstpad->get_audio_buffer)
72 ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
75 ret = ff_default_get_audio_buffer(link, perms, nb_samples);
78 ret->type = AVMEDIA_TYPE_AUDIO;
83 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
84 int linesize,int perms,
86 enum AVSampleFormat sample_fmt,
87 uint64_t channel_layout)
90 AVFilterBuffer *samples = av_mallocz(sizeof(*samples));
91 AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
93 if (!samples || !samplesref)
96 samplesref->buf = samples;
97 samplesref->buf->free = ff_avfilter_default_free_buffer;
98 if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
101 samplesref->audio->nb_samples = nb_samples;
102 samplesref->audio->channel_layout = channel_layout;
104 planes = av_sample_fmt_is_planar(sample_fmt) ?
105 av_get_channel_layout_nb_channels(channel_layout) : 1;
107 /* make sure the buffer gets read permission or it's useless for output */
108 samplesref->perms = perms | AV_PERM_READ;
110 samples->refcount = 1;
111 samplesref->type = AVMEDIA_TYPE_AUDIO;
112 samplesref->format = sample_fmt;
114 memcpy(samples->data, data,
115 FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
116 memcpy(samplesref->data, samples->data, sizeof(samples->data));
118 samples->linesize[0] = samplesref->linesize[0] = linesize;
120 if (planes > FF_ARRAY_ELEMS(samples->data)) {
121 samples-> extended_data = av_mallocz(sizeof(*samples->extended_data) *
123 samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
126 if (!samples->extended_data || !samplesref->extended_data)
129 memcpy(samples-> extended_data, data, sizeof(*data)*planes);
130 memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
132 samples->extended_data = samples->data;
133 samplesref->extended_data = samplesref->data;
136 samplesref->pts = AV_NOPTS_VALUE;
141 if (samples && samples->extended_data != samples->data)
142 av_freep(&samples->extended_data);
144 av_freep(&samplesref->audio);
145 if (samplesref->extended_data != samplesref->data)
146 av_freep(&samplesref->extended_data);
148 av_freep(&samplesref);
153 void ff_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
155 ff_filter_samples(link->dst->outputs[0], samplesref);
158 /* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
159 void ff_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
161 AVFilterLink *outlink = NULL;
163 if (inlink->dst->nb_outputs)
164 outlink = inlink->dst->outputs[0];
167 outlink->out_buf = ff_default_get_audio_buffer(inlink, AV_PERM_WRITE,
168 samplesref->audio->nb_samples);
169 outlink->out_buf->pts = samplesref->pts;
170 outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
171 ff_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
172 avfilter_unref_buffer(outlink->out_buf);
173 outlink->out_buf = NULL;
175 avfilter_unref_buffer(samplesref);
176 inlink->cur_buf = NULL;
179 void ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
181 void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
182 AVFilterPad *dst = link->dstpad;
185 FF_TPRINTF_START(NULL, filter_samples); ff_tlog_link(NULL, link, 1);
187 if (!(filter_samples = dst->filter_samples))
188 filter_samples = ff_default_filter_samples;
190 /* prepare to copy the samples if the buffer has insufficient permissions */
191 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
192 dst->rej_perms & samplesref->perms) {
194 av_log(link->dst, AV_LOG_DEBUG,
195 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
196 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
198 link->cur_buf = ff_default_get_audio_buffer(link, dst->min_perms,
199 samplesref->audio->nb_samples);
200 link->cur_buf->pts = samplesref->pts;
201 link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
203 /* Copy actual data into new samples buffer */
204 av_samples_copy(link->cur_buf->extended_data, samplesref->extended_data,
205 0, 0, samplesref->audio->nb_samples,
206 av_get_channel_layout_nb_channels(link->channel_layout),
209 avfilter_unref_buffer(samplesref);
211 link->cur_buf = samplesref;
213 pts = link->cur_buf->pts;
214 filter_samples(link, link->cur_buf);
215 ff_update_link_current_pts(link, pts);