From cb750e331b4e457e053c09e164344fc94aed5ec6 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Fri, 8 Aug 2003 18:03:31 +0000
Subject: [PATCH] added get_audio_frame()
Originally committed as revision 2116 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
output_example.c | 28 ++++++++++++++++++++--------
1 file changed, 20 insertions(+), 8 deletions(-)
diff --git a/output_example.c b/output_example.c
index 0e06b0cbb61..42153f1103a 100644
--- a/output_example.c
+++ b/output_example.c
@@ -115,21 +115,33 @@ void open_audio(AVFormatContext *oc, AVStream *st)
samples = malloc(audio_input_frame_size * 2 * c->channels);
}
+/* prepare a 16 bit dummy audio frame of 'frame_size' samples and
+ 'nb_channels' channels */
+void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
+{
+ int j, i, v;
+ int16_t *q;
+
+ q = samples;
+ for(j=0;j<frame_size;j++) {
+ v = (int)(sin(t) * 10000);
+ for(i = 0; i < nb_channels; i++)
+ *q++ = v;
+ t += tincr;
+ tincr += tincr2;
+ }
+}
+
void write_audio_frame(AVFormatContext *oc, AVStream *st)
{
- int j, out_size;
+ int out_size;
AVCodecContext *c;
c = &st->codec;
- for(j=0;j<audio_input_frame_size;j++) {
- samples[2*j] = (int)(sin(t) * 10000);
- samples[2*j+1] = samples[2*j];
- t += tincr;
- tincr += tincr2;
- }
-
+ get_audio_frame(samples, audio_input_frame_size, c->channels);
+
out_size = avcodec_encode_audio(c, audio_outbuf, audio_outbuf_size, samples);
/* write the compressed frame in the media file */
--
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