/* * ACT file format demuxer * Copyright (c) 2007-2008 Vladimir Voroshilov * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */#include "avformat.h"#include "riff.h"#include "internal.h"#include "libavcodec/get_bits.h" #define CHUNK_SIZE 512#define RIFF_TAG MKTAG('R','I','F','F')#define WAVE_TAG MKTAG('W','A','V','E') typedef struct{    int bytes_left_in_chunk;    uint8_t audio_buffer[22];///< temporary buffer for ACT frame    char second_packet;      ///< 1 - if temporary buffer contains valid (second) G.729 packet} ACTContext; static int probe(AVProbeData *p){    int i;     if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||        (AV_RL32(&p->buf[8]) != WAVE_TAG) ||        (AV_RL32(&p->buf[16]) != 16))    return 0;     //We can't be sure that this is ACT and not regular WAV    if (p->buf_size<512)        return 0;     for(i=44; i<256; i++)        if(p->buf[i])            return 0;     if(p->buf[256]!=0x84)        return 0;     for(i=264; i<512; i++)        if(p->buf[i])            return 0;     return AVPROBE_SCORE_MAX;} static int read_header(AVFormatContext *s){    ACTContext* ctx = s->priv_data;    AVIOContext *pb = s->pb;    int size;    AVStream* st;     int min,sec,msec;     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);     avio_skip(pb, 16);    size=avio_rl32(pb);    ff_get_wav_header(s, pb, st->codecpar, size, 0);     /*      8000Hz (Fine-rec) file format has 10 bytes long      packets with 10ms of sound data in them    */    if (st->codecpar->sample_rate != 8000) {        av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codecpar->sample_rate);        return AVERROR_INVALIDDATA;    }     st->codecpar->frame_size=80;    st->codecpar->channels=1;    avpriv_set_pts_info(st, 64, 1, 100);     st->codecpar->codec_id=AV_CODEC_ID_G729;     avio_seek(pb, 257, SEEK_SET);    msec=avio_rl16(pb);    sec=avio_r8(pb);    min=avio_rl32(pb);     st->duration = av_rescale(1000*(min*60+sec)+msec, st->codecpar->sample_rate, 1000 * st->codecpar->frame_size);     ctx->bytes_left_in_chunk=CHUNK_SIZE;     avio_seek(pb, 512, SEEK_SET);     return 0;}  static int read_packet(AVFormatContext *s,                          AVPacket *pkt){    ACTContext *ctx = s->priv_data;    AVIOContext *pb = s->pb;    int ret;    int frame_size=s->streams[0]->codecpar->sample_rate==8000?10:22;      if(s->streams[0]->codecpar->sample_rate==8000)        ret=av_new_packet(pkt, 10);    else        ret=av_new_packet(pkt, 11);     if(ret)        return ret;     if(s->streams[0]->codecpar->sample_rate==4400 && !ctx->second_packet)    {        ret = avio_read(pb, ctx->audio_buffer, frame_size);         if(ret<0)            return ret;        if(ret!=frame_size)            return AVERROR(EIO);         pkt->data[0]=ctx->audio_buffer[11];        pkt->data[1]=ctx->audio_buffer[0];        pkt->data[2]=ctx->audio_buffer[12];        pkt->data[3]=ctx->audio_buffer[1];        pkt->data[4]=ctx->audio_buffer[13];        pkt->data[5]=ctx->audio_buffer[2];        pkt->data[6]=ctx->audio_buffer[14];        pkt->data[7]=ctx->audio_buffer[3];        pkt->data[8]=ctx->audio_buffer[15];        pkt->data[9]=ctx->audio_buffer[4];        pkt->data[10]=ctx->audio_buffer[16];         ctx->second_packet=1;    }    else if(s->streams[0]->codecpar->sample_rate==4400 && ctx->second_packet)    {        pkt->data[0]=ctx->audio_buffer[5];        pkt->data[1]=ctx->audio_buffer[17];        pkt->data[2]=ctx->audio_buffer[6];        pkt->data[3]=ctx->audio_buffer[18];        pkt->data[4]=ctx->audio_buffer[7];        pkt->data[5]=ctx->audio_buffer[19];        pkt->data[6]=ctx->audio_buffer[8];        pkt->data[7]=ctx->audio_buffer[20];        pkt->data[8]=ctx->audio_buffer[9];        pkt->data[9]=ctx->audio_buffer[21];        pkt->data[10]=ctx->audio_buffer[10];         ctx->second_packet=0;    }    else // 8000 Hz    {        ret = avio_read(pb, ctx->audio_buffer, frame_size);         if(ret<0)            return ret;        if(ret!=frame_size)            return AVERROR(EIO);         pkt->data[0]=ctx->audio_buffer[5];        pkt->data[1]=ctx->audio_buffer[0];        pkt->data[2]=ctx->audio_buffer[6];        pkt->data[3]=ctx->audio_buffer[1];        pkt->data[4]=ctx->audio_buffer[7];        pkt->data[5]=ctx->audio_buffer[2];        pkt->data[6]=ctx->audio_buffer[8];        pkt->data[7]=ctx->audio_buffer[3];        pkt->data[8]=ctx->audio_buffer[9];        pkt->data[9]=ctx->audio_buffer[4];    }     ctx->bytes_left_in_chunk -= frame_size;     if(ctx->bytes_left_in_chunk < frame_size)    {        avio_skip(pb, ctx->bytes_left_in_chunk);        ctx->bytes_left_in_chunk=CHUNK_SIZE;    }     pkt->duration=1;     return ret;} AVInputFormat ff_act_demuxer = {    .name           = "act",    .long_name      = "ACT Voice file format",    .priv_data_size = sizeof(ACTContext),    .read_probe     = probe,    .read_header    = read_header,    .read_packet    = read_packet,};