AMR-WB support by (Johannes Carlsson <joca at rixmail dot se>)

Originally committed as revision 2311 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 123 insertions, 57 deletions

diff --git a/libavformat/amr.c b/libavformat/amr.c
index 4baa427ea3..67a7748bda 100644
--- a/libavformat/amr.c
+++ b/libavformat/amr.c
@@ -20,34 +20,34 @@
 /*
 Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
 
-Only amr narrowband (not amr-wb) is supported for now.
+Only mono files are supported.
 
 */
 #include "avformat.h"
-#include "avi.h"
 
 static const unsigned char AMR_header [] = "#!AMR\n";
-
-/* AMR_FILE header */
-static int put_amr_header(ByteIOContext *pb, AVCodecContext *enc)
-{
-    put_tag(pb, AMR_header);       /* magic number */
-    return 0;
-}
+static const unsigned char AMRWB_header [] = "#!AMR-WB\n";
 
 static int amr_write_header(AVFormatContext *s)
 {
     ByteIOContext *pb = &s->pb;
+    AVCodecContext *enc = &s->streams[0]->codec;
 
     s->priv_data = NULL;
 
-    /* format header */
-    if (put_amr_header(pb, &s->streams[0]->codec) < 0) {
-        return -1;
+    if (enc->codec_id == CODEC_ID_AMR_NB)
+    {
+        put_tag(pb, AMR_header);       /* magic number */
+    }
+    else if(enc->codec_id == CODEC_ID_AMR_WB)
+    {
+        put_tag(pb, AMRWB_header);       /* magic number */
+    }
+    else
+    {
+        //This is an error!
     }
-
     put_flush_packet(pb);
-
     return 0;
 }
 
@@ -66,10 +66,13 @@ static int amr_write_trailer(AVFormatContext *s)
 
 static int amr_probe(AVProbeData *p)
 {
-    /* check file header */
-    if (p->buf_size < 6)
+    //Only check for "#!AMR" which could be amr-wb, amr-nb. 
+    //This will also trigger multichannel files: "#!AMR_MC1.0\n" and 
+    //"#!AMR-WB_MC1.0\n" (not supported)
+
+    if (p->buf_size < 5)
         return 0;
-    if(memcmp(p->buf,AMR_header,6)==0)
+    if(memcmp(p->buf,AMR_header,5)==0)
         return AVPROBE_SCORE_MAX;
     else
         return 0;
@@ -81,24 +84,44 @@ static int amr_read_header(AVFormatContext *s,
 {
     ByteIOContext *pb = &s->pb;
     AVStream *st;
-    uint8_t header[6];
+    uint8_t header[9];
 
     get_buffer(pb, header, 6);
 
     if(memcmp(header,AMR_header,6)!=0)
     {
-        return -1;
+        get_buffer(pb, header+6, 3);
+        if(memcmp(header,AMRWB_header,9)!=0)
+        {
+            return -1;
+        }
+        st = av_new_stream(s, 0);
+        if (!st)
+        {
+            return AVERROR_NOMEM;
+        }
+    
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_tag = CODEC_ID_AMR_WB;
+        st->codec.codec_id = CODEC_ID_AMR_WB;
+        st->codec.channels = 1;
+        st->codec.sample_rate = 16000;
+    }
+    else
+    {
+        st = av_new_stream(s, 0);
+        if (!st)
+        {
+            return AVERROR_NOMEM;
+        }
+    
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_tag = CODEC_ID_AMR_NB;
+        st->codec.codec_id = CODEC_ID_AMR_NB;
+        st->codec.channels = 1;
+        st->codec.sample_rate = 8000;
     }
 
-    st = av_new_stream(s, 0);
-    if (!st)
-        return AVERROR_NOMEM;
-
-    st->codec.codec_type = CODEC_TYPE_AUDIO;
-    st->codec.codec_tag = CODEC_ID_AMR_NB;
-    st->codec.codec_id = CODEC_ID_AMR_NB;
-    st->codec.channels = 1;
-    st->codec.sample_rate = 8000;
     return 0;
 }
 
@@ -107,39 +130,82 @@ static int amr_read_header(AVFormatContext *s,
 static int amr_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
 {
-    static uint16_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
-    uint8_t toc, q, ft;
-    int read;
-    int size;
+    AVCodecContext *enc = &s->streams[0]->codec;
 
-    if (url_feof(&s->pb))
-        return -EIO;
-
-    toc=0;
-
-    toc=get_byte(&s->pb);
-
-    q  = (toc >> 2) & 0x01;
-    ft = (toc >> 3) & 0x0F;
-
-    size=packed_size[ft];
-    //printf("amr_read_packet size=%d\n",size);
-
-    if (av_new_packet(pkt, size+1))
-        return -EIO;
-    pkt->stream_index = 0;
+    if (enc->codec_id == CODEC_ID_AMR_NB)
+    {
+        const static uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
+        uint8_t toc, q, ft;
+        int read;
+        int size;
     
-    pkt->data[0]=toc;
-
-    read = get_buffer(&s->pb, pkt->data+1, size);
-
-    if (read != size)
+        if (url_feof(&s->pb))
+        {
+            return -EIO;
+        }
+    
+        toc=get_byte(&s->pb);
+        q  = (toc >> 2) & 0x01;
+        ft = (toc >> 3) & 0x0F;
+    
+        size=packed_size[ft];
+    
+        if (av_new_packet(pkt, size+1))
+        {
+            return -EIO;
+        }
+        pkt->stream_index = 0;
+        
+        pkt->data[0]=toc;
+    
+        read = get_buffer(&s->pb, pkt->data+1, size);
+    
+        if (read != size)
+        {
+            av_free_packet(pkt);
+            return -EIO;
+        }
+    
+        return 0;
+    }
+    else if(enc->codec_id == CODEC_ID_AMR_WB)
+    {
+        static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
+        uint8_t toc, mode;
+        int read;
+        int size;
+    
+        if (url_feof(&s->pb))
+        {
+            return -EIO;
+        }
+    
+        toc=get_byte(&s->pb);
+        mode = (uint8_t)((toc >> 3) & 0x0F);
+        size = packed_size[mode];
+    
+        if ( (size==0) || av_new_packet(pkt, size))
+        {
+            return -EIO;
+        }
+    
+        pkt->stream_index = 0;
+        pkt->data[0]=toc;
+    
+        read = get_buffer(&s->pb, pkt->data+1, size-1);
+    
+        if (read != (size-1))
+        {
+            av_free_packet(pkt);
+            return -EIO;
+        }
+    
+        return 0;
+    }
+    else
     {
-        av_free_packet(pkt);
         return -EIO;
     }
-
-    return 0;
 }
 
 static int amr_read_close(AVFormatContext *s)
@@ -150,7 +216,7 @@ static int amr_read_close(AVFormatContext *s)
 static AVInputFormat amr_iformat = {
     "amr",
     "3gpp amr file format",
-    0,
+    0, /*priv_data_size*/
     amr_probe,
     amr_read_header,
     amr_read_packet,