/*  * amr file format * Copyright (c) 2001 ffmpeg project * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *//*Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267Only mono files are supported.*/#include "avformat.h"static const unsigned char AMR_header [] = "#!AMR\n";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;    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;}static int amr_write_packet(AVFormatContext *s, int stream_index_ptr,                           uint8_t *buf, int size, int force_pts){    put_buffer(&s->pb, buf, size);    put_flush_packet(&s->pb);    return 0;}static int amr_write_trailer(AVFormatContext *s){    return 0;}static int amr_probe(AVProbeData *p){    //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,5)==0)        return AVPROBE_SCORE_MAX;    else        return 0;}/* amr input */static int amr_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    ByteIOContext *pb = &s->pb;    AVStream *st;    uint8_t header[9];    get_buffer(pb, header, 6);    if(memcmp(header,AMR_header,6)!=0)    {        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;    }    return 0;}#define MAX_SIZE 32static int amr_read_packet(AVFormatContext *s,                          AVPacket *pkt){    AVCodecContext *enc = &s->streams[0]->codec;    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;            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    {        return -EIO;    }}static int amr_read_close(AVFormatContext *s){    return 0;}static AVInputFormat amr_iformat = {    "amr",    "3gpp amr file format",    0, /*priv_data_size*/    amr_probe,    amr_read_header,    amr_read_packet,    amr_read_close,};static AVOutputFormat amr_oformat = {    "amr",    "3gpp amr file format",    "audio/amr",    "amr",    0,    CODEC_ID_AMR_NB,    CODEC_ID_NONE,    amr_write_header,    amr_write_packet,    amr_write_trailer,};int amr_init(void){    av_register_input_format(&amr_iformat);    av_register_output_format(&amr_oformat);    return 0;}