diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index cc0644e6df..4e6215a55f 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -869,5 +869,7 @@ void avcodec_register_all(void)
     av_register_bitstream_filter(&dump_extradata_bsf);
     av_register_bitstream_filter(&remove_extradata_bsf);
     av_register_bitstream_filter(&noise_bsf);
+    av_register_bitstream_filter(&mp3_header_compress_bsf);
+    av_register_bitstream_filter(&mp3_header_decompress_bsf);
 }
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index ac128eca40..daa054b65e 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2662,6 +2662,8 @@ void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
 extern AVBitStreamFilter dump_extradata_bsf;
 extern AVBitStreamFilter remove_extradata_bsf;
 extern AVBitStreamFilter noise_bsf;
+extern AVBitStreamFilter mp3_header_compress_bsf;
+extern AVBitStreamFilter mp3_header_decompress_bsf;
 
 
 /* memory */
diff --git a/libavcodec/bitstream_filter.c b/libavcodec/bitstream_filter.c
index 8f878cd0da..ef2d7414a6 100644
--- a/libavcodec/bitstream_filter.c
+++ b/libavcodec/bitstream_filter.c
@@ -19,6 +19,7 @@
  */
 
 #include "avcodec.h"
+#include "mpegaudio.h"
 
 AVBitStreamFilter *first_bitstream_filter= NULL;
 
@@ -124,6 +125,112 @@ static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const ch
     return 1;
 }
 
+static int mp3_header_compress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+                     uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size, int keyframe){
+    uint32_t header;
+    int mode_extension;
+
+    if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
+        av_log(avctx, AV_LOG_ERROR, "not standards compliant\n");
+        return -1;
+    }
+
+    header = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
+    mode_extension= (header>>4)&3;
+
+    if(ff_mpa_check_header(header) < 0 || (header&0x70000) != 0x30000){
+        *poutbuf= (uint8_t *) buf;
+        *poutbuf_size= buf_size;
+
+        av_log(avctx, AV_LOG_INFO, "cannot compress %08X\n", header);
+        return 0;
+    }
+
+    *poutbuf_size= buf_size - 4;
+    *poutbuf= av_malloc(buf_size - 4 + FF_INPUT_BUFFER_PADDING_SIZE);
+    memcpy(*poutbuf, buf + 4, buf_size - 4 + FF_INPUT_BUFFER_PADDING_SIZE);
+
+    if(avctx->channels==2){
+        if((header & (3<<19)) != 3<<19){
+            (*poutbuf)[1] &= 0x3F;
+            (*poutbuf)[1] |= mode_extension<<6;
+            FFSWAP(int, (*poutbuf)[1], (*poutbuf)[2]);
+        }else{
+            (*poutbuf)[1] &= 0x8F;
+            (*poutbuf)[1] |= mode_extension<<4;
+        }
+    }
+
+    return 1;
+}
+
+static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+                     uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size, int keyframe){
+    uint32_t header;
+    int sample_rate= avctx->sample_rate;
+    int sample_rate_index=0;
+    int lsf, mpeg25, bitrate_index, frame_size;
+
+    header = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
+    if(ff_mpa_check_header(header) >= 0){
+        *poutbuf= (uint8_t *) buf;
+        *poutbuf_size= buf_size;
+
+        return 0;
+    }
+
+    header= 0xFFE00000 | ((4-3)<<17) | (1<<16); //FIXME simplify
+
+    lsf     = sample_rate < (24000+32000)/2;
+    mpeg25  = sample_rate < (12000+16000)/2;
+    header |= (!mpeg25)<<20;
+    header |= (!lsf   )<<19;
+    if(sample_rate<<(lsf+mpeg25) < (44100+32000)/2)
+        sample_rate_index |= 2;
+    else if(sample_rate<<(lsf+mpeg25) > (44100+48000)/2)
+        sample_rate_index |= 1;
+
+    header |= sample_rate_index<<10;
+    sample_rate= mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
+
+    for(bitrate_index=2; bitrate_index<30; bitrate_index++){
+        frame_size = mpa_bitrate_tab[lsf][2][bitrate_index>>1];
+        frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
+        if(frame_size == buf_size + 4)
+            break;
+    }
+    if(bitrate_index == 30){
+        av_log(avctx, AV_LOG_ERROR, "couldnt find bitrate_index\n");
+        return -1;
+    }
+
+    header |= (bitrate_index&1)<<9;
+    header |= (bitrate_index>>1)<<12;
+    header |= (avctx->channels==1 ? MPA_MONO : MPA_JSTEREO)<<6;
+
+    *poutbuf_size= buf_size + 4;
+    *poutbuf= av_malloc(buf_size + 4 + FF_INPUT_BUFFER_PADDING_SIZE);
+    memcpy(*poutbuf + 4, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+    if(avctx->channels==2){
+        if(lsf){
+            FFSWAP(int, (*poutbuf)[5], (*poutbuf)[6]);
+            header |= ((*poutbuf)[5] & 0xC0)>>2;
+        }else{
+            header |= (*poutbuf)[5] & 0x30;
+        }
+    }
+
+    (*poutbuf)[0]= header>>24;
+    (*poutbuf)[1]= header>>16;
+    (*poutbuf)[2]= header>> 8;
+    (*poutbuf)[3]= header    ;
+
+    return 1;
+}
+
 AVBitStreamFilter dump_extradata_bsf={
     "dump_extra",
     0,
@@ -141,3 +248,15 @@ AVBitStreamFilter noise_bsf={
     sizeof(int),
     noise,
 };
+
+AVBitStreamFilter mp3_header_compress_bsf={
+    "mp3comp",
+    0,
+    mp3_header_compress,
+};
+
+AVBitStreamFilter mp3_header_decompress_bsf={
+    "mp3decomp",
+    0,
+    mp3_header_decompress,
+};