lavfi: merge all filtering code into ff_filter_frame.
[ffmpeg.git] / libavfilter / audio.c
1 /*
2  * Copyright (c) Stefano Sabatini | stefasab at gmail.com
3  * Copyright (c) S.N. Hemanth Meenakshisundaram | smeenaks at ucsd.edu
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21
22 #include "libavutil/avassert.h"
23 #include "libavutil/channel_layout.h"
24 #include "libavutil/common.h"
25
26 #include "audio.h"
27 #include "avfilter.h"
28 #include "internal.h"
29
30 int avfilter_ref_get_channels(AVFilterBufferRef *ref)
31 {
32     return ref->audio ? ref->audio->channels : 0;
33 }
34
35 AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
36                                             int nb_samples)
37 {
38     return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
39 }
40
41 AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
42                                                int nb_samples)
43 {
44     AVFilterBufferRef *samplesref = NULL;
45     uint8_t **data;
46     int planar      = av_sample_fmt_is_planar(link->format);
47     int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
48     int planes      = planar ? nb_channels : 1;
49     int linesize;
50     int full_perms = AV_PERM_READ | AV_PERM_WRITE | AV_PERM_PRESERVE |
51                      AV_PERM_REUSE | AV_PERM_REUSE2 | AV_PERM_ALIGN;
52
53     av_assert1(!(perms & ~(full_perms | AV_PERM_NEG_LINESIZES)));
54
55     if (!(data = av_mallocz(sizeof(*data) * planes)))
56         goto fail;
57
58     if (av_samples_alloc(data, &linesize, nb_channels, nb_samples, link->format, 0) < 0)
59         goto fail;
60
61     samplesref = avfilter_get_audio_buffer_ref_from_arrays_channels(
62         data, linesize, full_perms, nb_samples, link->format,
63         link->channels, link->channel_layout);
64     if (!samplesref)
65         goto fail;
66
67     samplesref->audio->sample_rate = link->sample_rate;
68
69     av_freep(&data);
70
71 fail:
72     if (data)
73         av_freep(&data[0]);
74     av_freep(&data);
75     return samplesref;
76 }
77
78 AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
79                                        int nb_samples)
80 {
81     AVFilterBufferRef *ret = NULL;
82
83     if (link->dstpad->get_audio_buffer)
84         ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
85
86     if (!ret)
87         ret = ff_default_get_audio_buffer(link, perms, nb_samples);
88
89     if (ret)
90         ret->type = AVMEDIA_TYPE_AUDIO;
91
92     return ret;
93 }
94
95 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
96                                                                       int linesize,
97                                                                       int perms,
98                                                                       int nb_samples,
99                                                                       enum AVSampleFormat sample_fmt,
100                                                                       int channels,
101                                                                       uint64_t channel_layout)
102 {
103     int planes;
104     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
105     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
106
107     if (!samples || !samplesref)
108         goto fail;
109
110     av_assert0(channels);
111     av_assert0(channel_layout == 0 ||
112                channels == av_get_channel_layout_nb_channels(channel_layout));
113
114     samplesref->buf         = samples;
115     samplesref->buf->free   = ff_avfilter_default_free_buffer;
116     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
117         goto fail;
118
119     samplesref->audio->nb_samples     = nb_samples;
120     samplesref->audio->channel_layout = channel_layout;
121     samplesref->audio->channels       = channels;
122
123     planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
124
125     /* make sure the buffer gets read permission or it's useless for output */
126     samplesref->perms = perms | AV_PERM_READ;
127
128     samples->refcount  = 1;
129     samplesref->type   = AVMEDIA_TYPE_AUDIO;
130     samplesref->format = sample_fmt;
131
132     memcpy(samples->data, data,
133            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
134     memcpy(samplesref->data, samples->data, sizeof(samples->data));
135
136     samples->linesize[0] = samplesref->linesize[0] = linesize;
137
138     if (planes > FF_ARRAY_ELEMS(samples->data)) {
139         samples->   extended_data = av_mallocz(sizeof(*samples->extended_data) *
140                                                planes);
141         samplesref->extended_data = av_mallocz(sizeof(*samplesref->extended_data) *
142                                                planes);
143
144         if (!samples->extended_data || !samplesref->extended_data)
145             goto fail;
146
147         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
148         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
149     } else {
150         samples->extended_data    = samples->data;
151         samplesref->extended_data = samplesref->data;
152     }
153
154     samplesref->pts = AV_NOPTS_VALUE;
155
156     return samplesref;
157
158 fail:
159     if (samples && samples->extended_data != samples->data)
160         av_freep(&samples->extended_data);
161     if (samplesref) {
162         av_freep(&samplesref->audio);
163         if (samplesref->extended_data != samplesref->data)
164             av_freep(&samplesref->extended_data);
165     }
166     av_freep(&samplesref);
167     av_freep(&samples);
168     return NULL;
169 }
170
171 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
172                                                              int linesize,int perms,
173                                                              int nb_samples,
174                                                              enum AVSampleFormat sample_fmt,
175                                                              uint64_t channel_layout)
176 {
177     int channels = av_get_channel_layout_nb_channels(channel_layout);
178     return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
179                                                               nb_samples, sample_fmt,
180                                                               channels, channel_layout);
181 }