From: Juan Carlos Rodriguez <[email protected]>
---
libavcodec/mpeg4audio.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
libavcodec/mpeg4audio.h | 5 +++++
2 files changed, 49 insertions(+), 0 deletions(-)
diff --git a/libavcodec/mpeg4audio.c b/libavcodec/mpeg4audio.c
index f0399af..48033aa 100644
--- a/libavcodec/mpeg4audio.c
+++ b/libavcodec/mpeg4audio.c
@@ -181,3 +181,47 @@ int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
return put_bits_count(pb) - offset;
}
+
+int ff_aac_make_latm_header(AVCodecContext *ctx)
+{
+ int rate_index;
+
+ for (rate_index = 0; rate_index < 16; rate_index++)
+ if (ff_mpeg4audio_sample_rates[rate_index] == ctx->sample_rate)
+ break;
+ if (rate_index == 16) {
+ av_log(ctx, AV_LOG_ERROR, "Unsupported sample rate\n");
+ return AVERROR(ENOSYS);
+ }
+
+ av_freep(&ctx->extradata);
+ ctx->extradata_size = 6;
+ ctx->extradata = av_mallocz(ctx->extradata_size +
+ FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!ctx->extradata)
+ return AVERROR(ENOMEM);
+
+ ctx->extradata[0] = 0x40;
+ ctx->extradata[1] = 0;
+ ctx->extradata[2] = 0x20 | rate_index;
+ ctx->extradata[3] = ctx->channels << 4;
+ ctx->extradata[4] = 0x3f;
+ ctx->extradata[5] = 0xc0;
+ return 0;
+}
+
+int ff_aac_latm_wrap(AVCodecContext *avctx, uint8_t *buffer, int length,
+ int buf_size)
+{
+ int header_size = length/0xff + 1;
+ if (length <= 0)
+ return length;
+ if (header_size + length > buf_size) {
+ av_log(avctx, AV_LOG_ERROR, "Output buffer not large enough for LATM
header\n");
+ return AVERROR(EINVAL);
+ }
+ memmove(buffer + header_size, buffer, length);
+ memset(buffer, 0xff, header_size - 1);
+ buffer[header_size - 1] = length % 0xff;
+ return length + header_size;
+}
diff --git a/libavcodec/mpeg4audio.h b/libavcodec/mpeg4audio.h
index 2d2b4a2..21341ac 100644
--- a/libavcodec/mpeg4audio.h
+++ b/libavcodec/mpeg4audio.h
@@ -23,6 +23,7 @@
#define AVCODEC_MPEG4AUDIO_H
#include <stdint.h>
+#include "avcodec.h"
#include "get_bits.h"
#include "put_bits.h"
@@ -103,4 +104,8 @@ enum AudioObjectType {
int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb);
+int ff_aac_make_latm_header(AVCodecContext *ctx);
+int ff_aac_latm_wrap(AVCodecContext *ctx, uint8_t *buffer, int length,
+ int buf_size);
+
#endif /* AVCODEC_MPEG4AUDIO_H */
--
1.7.3.1
_______________________________________________
libav-devel mailing list
[email protected]
https://lists.libav.org/mailman/listinfo/libav-devel
