huffyuvdec: swap code blocks
[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 #include "libavcodec/avcodec.h"
26
27 #include "audio.h"
28 #include "avfilter.h"
29 #include "internal.h"
30
31 int avfilter_ref_get_channels(AVFilterBufferRef *ref)
32 {
33     return ref->audio ? ref->audio->channels : 0;
34 }
35
36 AVFrame *ff_null_get_audio_buffer(AVFilterLink *link, int nb_samples)
37 {
38     return ff_get_audio_buffer(link->dst->outputs[0], nb_samples);
39 }
40
41 AVFrame *ff_default_get_audio_buffer(AVFilterLink *link, int nb_samples)
42 {
43     AVFrame *frame = av_frame_alloc();
44     int channels = link->channels;
45     int ret;
46
47     av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout));
48
49     if (!frame)
50         return NULL;
51
52     frame->nb_samples     = nb_samples;
53     frame->format         = link->format;
54     av_frame_set_channels(frame, link->channels);
55     frame->channel_layout = link->channel_layout;
56     frame->sample_rate    = link->sample_rate;
57     ret = av_frame_get_buffer(frame, 0);
58     if (ret < 0) {
59         av_frame_free(&frame);
60         return NULL;
61     }
62
63     av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,
64                            link->format);
65
66
67     return frame;
68 }
69
70 AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
71 {
72     AVFrame *ret = NULL;
73
74     if (link->dstpad->get_audio_buffer)
75         ret = link->dstpad->get_audio_buffer(link, nb_samples);
76
77     if (!ret)
78         ret = ff_default_get_audio_buffer(link, nb_samples);
79
80     return ret;
81 }
82
83 #if FF_API_AVFILTERBUFFER
84 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays_channels(uint8_t **data,
85                                                                       int linesize,int perms,
86                                                                       int nb_samples,
87                                                                       enum AVSampleFormat sample_fmt,
88                                                                       int channels,
89                                                                       uint64_t channel_layout)
90 {
91     int planes;
92     AVFilterBuffer    *samples    = av_mallocz(sizeof(*samples));
93     AVFilterBufferRef *samplesref = av_mallocz(sizeof(*samplesref));
94
95     if (!samples || !samplesref)
96         goto fail;
97
98     av_assert0(channels);
99     av_assert0(channel_layout == 0 ||
100                channels == av_get_channel_layout_nb_channels(channel_layout));
101
102     samplesref->buf         = samples;
103     samplesref->buf->free   = ff_avfilter_default_free_buffer;
104     if (!(samplesref->audio = av_mallocz(sizeof(*samplesref->audio))))
105         goto fail;
106
107     samplesref->audio->nb_samples     = nb_samples;
108     samplesref->audio->channel_layout = channel_layout;
109     samplesref->audio->channels       = channels;
110
111     planes = av_sample_fmt_is_planar(sample_fmt) ? channels : 1;
112
113     /* make sure the buffer gets read permission or it's useless for output */
114     samplesref->perms = perms | AV_PERM_READ;
115
116     samples->refcount  = 1;
117     samplesref->type   = AVMEDIA_TYPE_AUDIO;
118     samplesref->format = sample_fmt;
119
120     memcpy(samples->data, data,
121            FFMIN(FF_ARRAY_ELEMS(samples->data), planes)*sizeof(samples->data[0]));
122     memcpy(samplesref->data, samples->data, sizeof(samples->data));
123
124     samples->linesize[0] = samplesref->linesize[0] = linesize;
125
126     if (planes > FF_ARRAY_ELEMS(samples->data)) {
127         samples->   extended_data = av_mallocz_array(sizeof(*samples->extended_data),
128                                                planes);
129         samplesref->extended_data = av_mallocz_array(sizeof(*samplesref->extended_data),
130                                                planes);
131
132         if (!samples->extended_data || !samplesref->extended_data)
133             goto fail;
134
135         memcpy(samples->   extended_data, data, sizeof(*data)*planes);
136         memcpy(samplesref->extended_data, data, sizeof(*data)*planes);
137     } else {
138         samples->extended_data    = samples->data;
139         samplesref->extended_data = samplesref->data;
140     }
141
142     samplesref->pts = AV_NOPTS_VALUE;
143
144     return samplesref;
145
146 fail:
147     if (samples && samples->extended_data != samples->data)
148         av_freep(&samples->extended_data);
149     if (samplesref) {
150         av_freep(&samplesref->audio);
151         if (samplesref->extended_data != samplesref->data)
152             av_freep(&samplesref->extended_data);
153     }
154     av_freep(&samplesref);
155     av_freep(&samples);
156     return NULL;
157 }
158
159 AVFilterBufferRef* avfilter_get_audio_buffer_ref_from_arrays(uint8_t **data,
160                                                              int linesize,int perms,
161                                                              int nb_samples,
162                                                              enum AVSampleFormat sample_fmt,
163                                                              uint64_t channel_layout)
164 {
165     int channels = av_get_channel_layout_nb_channels(channel_layout);
166     return avfilter_get_audio_buffer_ref_from_arrays_channels(data, linesize, perms,
167                                                               nb_samples, sample_fmt,
168                                                               channels, channel_layout);
169 }
170 #endif