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avcodec/libfdk-accenc: Add option to set frame length when encoding with libfdk_aac 

Some specifications require the size of ld/eld frames to be 480 samples
instead of the default 512. libfdk_aac provides an option to set an alternative
frame size, but it's not exposed via the ffmpeg interface.
This patch adds a frame_length option to solve this problem.

Signed-off-by: Raphael Schlarb <info@raphael.schlarb.one>
Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Raphael Schlarb 2023-03-30 14:27:41 +02:00 committed by James Almer
parent 412d43b09a
commit d2e1389285
2 changed files with 12 additions and 1 deletions
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11
libavcodec/libfdk-aacenc.c
View File

@ -55,6 +55,7 @@ typedef struct AACContext {
int metadata_mode;
AACENC_MetaData metaDataSetup;
int delay_sent;
int frame_length;
AudioFrameQueue afq;
} AACContext;
@ -78,6 +79,7 @@ static const AVOption aac_enc_options[] = {
{ "comp_profile", "The desired compression profile for AAC DRC", offsetof(AACContext, comp_profile), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 256, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ "comp_target_ref", "Expected target reference level at decoder side in dB (for clipping prevention/limiter)", offsetof(AACContext, comp_target_ref), AV_OPT_TYPE_INT, { .i64 = 0.0 }, -31.75, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ "prog_ref", "The program reference level or dialog level in dB", offsetof(AACContext, prog_ref), AV_OPT_TYPE_INT, { .i64 = 0.0 }, -31.75, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ "frame_length", "The desired frame length", offsetof(AACContext, frame_length), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1024, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
FF_AAC_PROFILE_OPTS
{ NULL }
};
@ -166,6 +168,15 @@ static av_cold int aac_encode_init(AVCodecContext *avctx)
}
}
if (s->frame_length >= 0) {
if ((err = aacEncoder_SetParam(s->handle, AACENC_GRANULE_LENGTH,
s->frame_length)) != AACENC_OK) {
av_log(avctx, AV_LOG_ERROR, "Unable to set granule length: %s\n",
aac_get_error(err));
goto error;
}
}
if ((err = aacEncoder_SetParam(s->handle, AACENC_SAMPLERATE,
avctx->sample_rate)) != AACENC_OK) {
av_log(avctx, AV_LOG_ERROR, "Unable to set the sample rate %d: %s\n",

2
libavcodec/version.h
View File

@ -30,7 +30,7 @@
#include "version_major.h"
#define LIBAVCODEC_VERSION_MINOR 7
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_MICRO 101
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \