yading@11: /*
yading@11:  * ACT file format demuxer
yading@11:  * Copyright (c) 2007-2008 Vladimir Voroshilov
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: #include "avformat.h"
yading@11: #include "riff.h"
yading@11: #include "internal.h"
yading@11: #include "libavcodec/get_bits.h"
yading@11: 
yading@11: #define CHUNK_SIZE 512
yading@11: #define RIFF_TAG MKTAG('R','I','F','F')
yading@11: #define WAVE_TAG MKTAG('W','A','V','E')
yading@11: 
yading@11: typedef struct{
yading@11:     int bytes_left_in_chunk;
yading@11:     uint8_t audio_buffer[22];///< temporary buffer for ACT frame
yading@11:     char second_packet;      ///< 1 - if temporary buffer contains valid (second) G.729 packet
yading@11: } ACTContext;
yading@11: 
yading@11: static int probe(AVProbeData *p)
yading@11: {
yading@11:     int i;
yading@11: 
yading@11:     if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
yading@11:         (AV_RL32(&p->buf[8]) != WAVE_TAG) ||
yading@11:         (AV_RL32(&p->buf[16]) != 16))
yading@11:     return 0;
yading@11: 
yading@11:     //We cant be sure that this is ACT and not regular WAV
yading@11:     if (p->buf_size<512)
yading@11:         return 0;
yading@11: 
yading@11:     for(i=44; i<256; i++)
yading@11:         if(p->buf[i])
yading@11:             return 0;
yading@11: 
yading@11:     if(p->buf[256]!=0x84)
yading@11:         return 0;
yading@11: 
yading@11:     for(i=264; i<512; i++)
yading@11:         if(p->buf[i])
yading@11:             return 0;
yading@11: 
yading@11:     return AVPROBE_SCORE_MAX;
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     ACTContext* ctx = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int size;
yading@11:     AVStream* st;
yading@11: 
yading@11:     int min,sec,msec;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     avio_skip(pb, 16);
yading@11:     size=avio_rl32(pb);
yading@11:     ff_get_wav_header(pb, st->codec, size);
yading@11: 
yading@11:     /*
yading@11:       8000Hz (Fine-rec) file format has 10 bytes long
yading@11:       packets with 10ms of sound data in them
yading@11:     */
yading@11:     if (st->codec->sample_rate != 8000) {
yading@11:         av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codec->sample_rate);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11: 
yading@11:     st->codec->frame_size=80;
yading@11:     st->codec->channels=1;
yading@11:     avpriv_set_pts_info(st, 64, 1, 100);
yading@11: 
yading@11:     st->codec->codec_id=AV_CODEC_ID_G729;
yading@11: 
yading@11:     avio_seek(pb, 257, SEEK_SET);
yading@11:     msec=avio_rl16(pb);
yading@11:     sec=avio_r8(pb);
yading@11:     min=avio_rl32(pb);
yading@11: 
yading@11:     st->duration = av_rescale(1000*(min*60+sec)+msec, st->codec->sample_rate, 1000 * st->codec->frame_size);
yading@11: 
yading@11:     ctx->bytes_left_in_chunk=CHUNK_SIZE;
yading@11: 
yading@11:     avio_seek(pb, 512, SEEK_SET);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: 
yading@11: static int read_packet(AVFormatContext *s,
yading@11:                           AVPacket *pkt)
yading@11: {
yading@11:     ACTContext *ctx = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int ret;
yading@11:     int frame_size=s->streams[0]->codec->sample_rate==8000?10:22;
yading@11: 
yading@11: 
yading@11:     if(s->streams[0]->codec->sample_rate==8000)
yading@11:         ret=av_new_packet(pkt, 10);
yading@11:     else
yading@11:         ret=av_new_packet(pkt, 11);
yading@11: 
yading@11:     if(ret)
yading@11:         return ret;
yading@11: 
yading@11:     if(s->streams[0]->codec->sample_rate==4400 && !ctx->second_packet)
yading@11:     {
yading@11:         ret = avio_read(pb, ctx->audio_buffer, frame_size);
yading@11: 
yading@11:         if(ret<0)
yading@11:             return ret;
yading@11:         if(ret!=frame_size)
yading@11:             return AVERROR(EIO);
yading@11: 
yading@11:         pkt->data[0]=ctx->audio_buffer[11];
yading@11:         pkt->data[1]=ctx->audio_buffer[0];
yading@11:         pkt->data[2]=ctx->audio_buffer[12];
yading@11:         pkt->data[3]=ctx->audio_buffer[1];
yading@11:         pkt->data[4]=ctx->audio_buffer[13];
yading@11:         pkt->data[5]=ctx->audio_buffer[2];
yading@11:         pkt->data[6]=ctx->audio_buffer[14];
yading@11:         pkt->data[7]=ctx->audio_buffer[3];
yading@11:         pkt->data[8]=ctx->audio_buffer[15];
yading@11:         pkt->data[9]=ctx->audio_buffer[4];
yading@11:         pkt->data[10]=ctx->audio_buffer[16];
yading@11: 
yading@11:         ctx->second_packet=1;
yading@11:     }
yading@11:     else if(s->streams[0]->codec->sample_rate==4400 && ctx->second_packet)
yading@11:     {
yading@11:         pkt->data[0]=ctx->audio_buffer[5];
yading@11:         pkt->data[1]=ctx->audio_buffer[17];
yading@11:         pkt->data[2]=ctx->audio_buffer[6];
yading@11:         pkt->data[3]=ctx->audio_buffer[18];
yading@11:         pkt->data[4]=ctx->audio_buffer[7];
yading@11:         pkt->data[5]=ctx->audio_buffer[19];
yading@11:         pkt->data[6]=ctx->audio_buffer[8];
yading@11:         pkt->data[7]=ctx->audio_buffer[20];
yading@11:         pkt->data[8]=ctx->audio_buffer[9];
yading@11:         pkt->data[9]=ctx->audio_buffer[21];
yading@11:         pkt->data[10]=ctx->audio_buffer[10];
yading@11: 
yading@11:         ctx->second_packet=0;
yading@11:     }
yading@11:     else // 8000 Hz
yading@11:     {
yading@11:         ret = avio_read(pb, ctx->audio_buffer, frame_size);
yading@11: 
yading@11:         if(ret<0)
yading@11:             return ret;
yading@11:         if(ret!=frame_size)
yading@11:             return AVERROR(EIO);
yading@11: 
yading@11:         pkt->data[0]=ctx->audio_buffer[5];
yading@11:         pkt->data[1]=ctx->audio_buffer[0];
yading@11:         pkt->data[2]=ctx->audio_buffer[6];
yading@11:         pkt->data[3]=ctx->audio_buffer[1];
yading@11:         pkt->data[4]=ctx->audio_buffer[7];
yading@11:         pkt->data[5]=ctx->audio_buffer[2];
yading@11:         pkt->data[6]=ctx->audio_buffer[8];
yading@11:         pkt->data[7]=ctx->audio_buffer[3];
yading@11:         pkt->data[8]=ctx->audio_buffer[9];
yading@11:         pkt->data[9]=ctx->audio_buffer[4];
yading@11:     }
yading@11: 
yading@11:     ctx->bytes_left_in_chunk -= frame_size;
yading@11: 
yading@11:     if(ctx->bytes_left_in_chunk < frame_size)
yading@11:     {
yading@11:         avio_skip(pb, ctx->bytes_left_in_chunk);
yading@11:         ctx->bytes_left_in_chunk=CHUNK_SIZE;
yading@11:     }
yading@11: 
yading@11:     pkt->duration=1;
yading@11: 
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_act_demuxer = {
yading@11:     .name           = "act",
yading@11:     .long_name      = "ACT Voice file format",
yading@11:     .priv_data_size = sizeof(ACTContext),
yading@11:     .read_probe     = probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11: };