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"
24 #include "libavutil/common.h"
30 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
33 return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
36 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
39 AVFilterBufferRef *samplesref = NULL;
41 int planar = av_sample_fmt_is_planar(link->format);
42 int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
43 int planes = planar ? nb_channels : 1;
45 int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
46 AV_PERM_REUSE | AV_PERM_REUSE2 | AV_PERM_ALIGN;
48 av_assert1(!(perms & ~(full_perms | AV_PERM_NEG_LINESIZES)));
50 if (!(data = av_mallocz(sizeof(*data) * planes)))
53 if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
56 samplesref = avfilter_get_audio_buffer_ref_from_arrays(data, linesize, full_perms,
57 nb_samples, link->format,
58 link->channel_layout);
71 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
74 AVFilterBufferRef *ret = NULL;
76 if (link->dstpad->get_audio_buffer)
77 ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
80 ret = ff_default_get_audio_buffer(link, perms, nb_samples);
83 ret->type = AVMEDIA_TYPE_AUDIO;
88 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
89 int linesize,int perms,
91 enum AVSampleFormat sample_fmt,
92 uint64_t channel_layout)
95 AVFilterBuffer *samples = av_mallocz(sizeof(*samples));
96 AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
98 if (!samples || !samplesref)
101 samplesref->buf = samples;
102 samplesref->buf->free = ff_avfilter_default_free_buffer;
103 if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
106 samplesref->audio->nb_samples = nb_samples;
107 samplesref->audio->channel_layout = channel_layout;
109 planes = av_sample_fmt_is_planar(sample_fmt) ?
110 av_get_channel_layout_nb_channels(channel_layout) : 1;
112 /* make sure the buffer gets read permission or it's useless for output */
113 samplesref->perms = perms | AV_PERM_READ;
115 samples->refcount = 1;
116 samplesref->type = AVMEDIA_TYPE_AUDIO;
117 samplesref->format = sample_fmt;
119 memcpy(samples->data, data,
120 FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
121 memcpy(samplesref->data, samples->data, sizeof(samples->data));
123 samples->linesize[0] = samplesref->linesize[0] = linesize;
125 if (planes > FF_ARRAY_ELEMS(samples->data)) {
126 samples-> extended_data = av_mallocz(sizeof(*samples->extended_data) *
128 samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
131 if (!samples->extended_data || !samplesref->extended_data)
134 memcpy(samples-> extended_data, data, sizeof(*data)*planes);
135 memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
137 samples->extended_data = samples->data;
138 samplesref->extended_data = samplesref->data;
141 samplesref->pts = AV_NOPTS_VALUE;
146 if (samples && samples->extended_data != samples->data)
147 av_freep(&samples->extended_data);
149 av_freep(&samplesref->audio);
150 if (samplesref->extended_data != samplesref->data)
151 av_freep(&samplesref->extended_data);
153 av_freep(&samplesref);
158 static int default_filter_samples(AVFilterLink *link,
159 AVFilterBufferRef *samplesref)
161 return ff_filter_samples(link->dst->outputs[0], samplesref);
164 int ff_filter_samples_framed(AVFilterLink *link, AVFilterBufferRef *samplesref)
166 int (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
167 AVFilterPad *src = link->srcpad;
168 AVFilterPad *dst = link->dstpad;
170 AVFilterBufferRef *buf_out;
173 FF_TPRINTF_START(NULL, filter_samples); ff_tlog_link(NULL, link, 1);
176 avfilter_unref_buffer(samplesref);
180 if (!(filter_samples = dst->filter_samples))
181 filter_samples = default_filter_samples;
183 av_assert1((samplesref->perms & src->min_perms) == src->min_perms);
184 samplesref->perms &= ~ src->rej_perms;
186 /* prepare to copy the samples if the buffer has insufficient permissions */
187 if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
188 dst->rej_perms & samplesref->perms) {
189 av_log(link->dst, AV_LOG_DEBUG,
190 "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
191 samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
193 buf_out = ff_default_get_audio_buffer(link, dst->min_perms,
194 samplesref->audio->nb_samples);
196 avfilter_unref_buffer(samplesref);
197 return AVERROR(ENOMEM);
199 buf_out->pts = samplesref->pts;
200 buf_out->audio->sample_rate = samplesref->audio->sample_rate;
202 /* Copy actual data into new samples buffer */
203 av_samples_copy(buf_out->extended_data, samplesref->extended_data,
204 0, 0, samplesref->audio->nb_samples,
205 av_get_channel_layout_nb_channels(link->channel_layout),
208 avfilter_unref_buffer(samplesref);
210 buf_out = samplesref;
212 link->cur_buf = buf_out;
214 ret = filter_samples(link, buf_out);
215 ff_update_link_current_pts(link, pts);
219 int ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
221 int insamples = samplesref->audio->nb_samples, inpos = 0, nb_samples;
222 AVFilterBufferRef *pbuf = link->partial_buf;
223 int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
226 if (!link->min_samples ||
228 insamples >= link->min_samples && insamples <= link->max_samples)) {
229 return ff_filter_samples_framed(link, samplesref);
231 /* Handle framing (min_samples, max_samples) */
234 AVRational samples_tb = { 1, link->sample_rate };
235 int perms = link->dstpad->min_perms | AV_PERM_WRITE;
236 pbuf = ff_get_audio_buffer(link, perms, link->partial_buf_size);
238 av_log(link->dst, AV_LOG_WARNING,
239 "Samples dropped due to memory allocation failure.\n");
242 avfilter_copy_buffer_ref_props(pbuf, samplesref);
243 pbuf->pts = samplesref->pts +
244 av_rescale_q(inpos, samples_tb, link->time_base);
245 pbuf->audio->nb_samples = 0;
247 nb_samples = FFMIN(insamples,
248 link->partial_buf_size - pbuf->audio->nb_samples);
249 av_samples_copy(pbuf->extended_data, samplesref->extended_data,
250 pbuf->audio->nb_samples, inpos,
251 nb_samples, nb_channels, link->format);
253 insamples -= nb_samples;
254 pbuf->audio->nb_samples += nb_samples;
255 if (pbuf->audio->nb_samples >= link->min_samples) {
256 ret = ff_filter_samples_framed(link, pbuf);
260 avfilter_unref_buffer(samplesref);
261 link->partial_buf = pbuf;