FFmpeg: libavfilter/audio.c Source File

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libavfilter

audio.c

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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 */

22 #include "libavutil/avassert.h"

23 #include "libavutil/channel_layout.h"

24 #include "libavutil/common.h"

25 #include "libavcodec/avcodec.h"

27 #include "audio.h"

28 #include "avfilter.h"

29 #include "internal.h"

31 int avfilter_ref_get_channels(AVFilterBufferRef *ref)

32 {

33 return ref->audio ? ref->audio->channels : 0;

34 }

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 }

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;

47 av_assert0(channels == av_get_channel_layout_nb_channels(link->channel_layout) || !av_get_channel_layout_nb_channels(link->channel_layout));

49 if (!frame)

50 return NULL;

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 }

63 av_samples_set_silence(frame->extended_data, 0, nb_samples, channels,

64 link->format);

67 return frame;

68 }

70 AVFrame *ff_get_audio_buffer(AVFilterLink *link, int nb_samples)

71 {

72 AVFrame *ret = NULL;

74 if (link->dstpad->get_audio_buffer)

75 ret = link->dstpad->get_audio_buffer(link, nb_samples);

77 if (!ret)

78 ret = ff_default_get_audio_buffer(link, nb_samples);

80 return ret;

81 }

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));

95 if (!samples || !samplesref)

96 goto fail;

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(sizeof(*samples->extended_data) *

128 planes);

129 samplesref->extended_data = av_mallocz(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

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