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Code Issues Releases Activity

avcodec/liblc3enc: Avoid allocating buffer to send a zero frame

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liblc3 supports arbitrary strides, so one can simply use a stride
of zero to make it read the same zero value again and again.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-09-30 18:53:08 +02:00
parent ab7d1c64c9
commit 15a9c8dea3
1 changed files with 3 additions and 9 deletions
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12
libavcodec/liblc3enc.c
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@@ -137,7 +137,6 @@ static int liblc3_encode(AVCodecContext *avctx, AVPacket *pkt,
LibLC3EncContext *liblc3 = avctx->priv_data;
int block_bytes = liblc3->block_bytes;
int channels = avctx->ch_layout.nb_channels;
void *zero_frame = NULL;
uint8_t *data_ptr;
int ret;
@@ -152,25 +151,20 @@ static int liblc3_encode(AVCodecContext *avctx, AVPacket *pkt,
return 0;
liblc3->remaining_samples = 0;
zero_frame = av_mallocz(avctx->frame_size * sizeof(float));
if (!zero_frame)
return AVERROR(ENOMEM);
}
data_ptr = pkt->data;
for (int ch = 0; ch < channels; ch++) {
const float *pcm = zero_frame ? zero_frame : frame->data[ch];
const float *pcm = frame ? (const float*)frame->data[ch] : (const float[]){ 0 };
int stride = !!frame; // use a stride of zero to send a zero frame
int nbytes = block_bytes / channels + (ch < block_bytes % channels);
lc3_encode(liblc3->encoder[ch],
LC3_PCM_FORMAT_FLOAT, pcm, 1, nbytes, data_ptr);
LC3_PCM_FORMAT_FLOAT, pcm, stride, nbytes, data_ptr);
data_ptr += nbytes;
}
if (zero_frame)
av_free(zero_frame);
*got_packet_ptr = 1;
return 0;