mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-28 20:26:14 +02:00
208 lines
5.6 KiB
C
208 lines
5.6 KiB
C
/*
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* ACT file format demuxer
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* Copyright (c) 2007-2008 Vladimir Voroshilov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "riff.h"
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#include "internal.h"
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#include "libavcodec/get_bits.h"
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#define CHUNK_SIZE 512
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#define RIFF_TAG MKTAG('R','I','F','F')
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#define WAVE_TAG MKTAG('W','A','V','E')
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typedef struct{
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int bytes_left_in_chunk;
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uint8_t audio_buffer[22];///< temporary buffer for ACT frame
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char second_packet; ///< 1 - if temporary buffer contains valid (second) G.729 packet
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} ACTContext;
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static int probe(const AVProbeData *p)
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{
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int i;
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if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
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(AV_RL32(&p->buf[8]) != WAVE_TAG) ||
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(AV_RL32(&p->buf[16]) != 16))
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return 0;
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//We can't be sure that this is ACT and not regular WAV
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if (p->buf_size<512)
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return 0;
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for(i=44; i<256; i++)
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if(p->buf[i])
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return 0;
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if(p->buf[256]!=0x84)
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return 0;
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for(i=264; i<512; i++)
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if(p->buf[i])
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int read_header(AVFormatContext *s)
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{
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ACTContext* ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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int size;
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AVStream* st;
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int min,sec,msec;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(pb, 16);
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size=avio_rl32(pb);
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ff_get_wav_header(s, pb, st->codecpar, size, 0);
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/*
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8000Hz (Fine-rec) file format has 10 bytes long
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packets with 10ms of sound data in them
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*/
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if (st->codecpar->sample_rate != 8000) {
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av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codecpar->sample_rate);
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return AVERROR_INVALIDDATA;
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}
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st->codecpar->frame_size=80;
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st->codecpar->channels=1;
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avpriv_set_pts_info(st, 64, 1, 100);
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st->codecpar->codec_id=AV_CODEC_ID_G729;
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avio_seek(pb, 257, SEEK_SET);
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msec=avio_rl16(pb);
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sec=avio_r8(pb);
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min=avio_rl32(pb);
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st->duration = av_rescale(1000*(min*60+sec)+msec, st->codecpar->sample_rate, 1000 * st->codecpar->frame_size);
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ctx->bytes_left_in_chunk=CHUNK_SIZE;
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avio_seek(pb, 512, SEEK_SET);
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return 0;
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}
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static int read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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ACTContext *ctx = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret;
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int frame_size=s->streams[0]->codecpar->sample_rate==8000?10:22;
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if(s->streams[0]->codecpar->sample_rate==8000)
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ret=av_new_packet(pkt, 10);
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else
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ret=av_new_packet(pkt, 11);
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if(ret)
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return ret;
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if(s->streams[0]->codecpar->sample_rate==4400 && !ctx->second_packet)
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{
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ret = avio_read(pb, ctx->audio_buffer, frame_size);
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if(ret<0)
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return ret;
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if(ret!=frame_size)
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return AVERROR(EIO);
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pkt->data[0]=ctx->audio_buffer[11];
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pkt->data[1]=ctx->audio_buffer[0];
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pkt->data[2]=ctx->audio_buffer[12];
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pkt->data[3]=ctx->audio_buffer[1];
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pkt->data[4]=ctx->audio_buffer[13];
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pkt->data[5]=ctx->audio_buffer[2];
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pkt->data[6]=ctx->audio_buffer[14];
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pkt->data[7]=ctx->audio_buffer[3];
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pkt->data[8]=ctx->audio_buffer[15];
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pkt->data[9]=ctx->audio_buffer[4];
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pkt->data[10]=ctx->audio_buffer[16];
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ctx->second_packet=1;
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}
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else if(s->streams[0]->codecpar->sample_rate==4400 && ctx->second_packet)
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{
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pkt->data[0]=ctx->audio_buffer[5];
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pkt->data[1]=ctx->audio_buffer[17];
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pkt->data[2]=ctx->audio_buffer[6];
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pkt->data[3]=ctx->audio_buffer[18];
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pkt->data[4]=ctx->audio_buffer[7];
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pkt->data[5]=ctx->audio_buffer[19];
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pkt->data[6]=ctx->audio_buffer[8];
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pkt->data[7]=ctx->audio_buffer[20];
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pkt->data[8]=ctx->audio_buffer[9];
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pkt->data[9]=ctx->audio_buffer[21];
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pkt->data[10]=ctx->audio_buffer[10];
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ctx->second_packet=0;
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}
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else // 8000 Hz
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{
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ret = avio_read(pb, ctx->audio_buffer, frame_size);
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if(ret<0)
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return ret;
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if(ret!=frame_size)
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return AVERROR(EIO);
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pkt->data[0]=ctx->audio_buffer[5];
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pkt->data[1]=ctx->audio_buffer[0];
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pkt->data[2]=ctx->audio_buffer[6];
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pkt->data[3]=ctx->audio_buffer[1];
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pkt->data[4]=ctx->audio_buffer[7];
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pkt->data[5]=ctx->audio_buffer[2];
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pkt->data[6]=ctx->audio_buffer[8];
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pkt->data[7]=ctx->audio_buffer[3];
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pkt->data[8]=ctx->audio_buffer[9];
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pkt->data[9]=ctx->audio_buffer[4];
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}
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ctx->bytes_left_in_chunk -= frame_size;
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if(ctx->bytes_left_in_chunk < frame_size)
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{
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avio_skip(pb, ctx->bytes_left_in_chunk);
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ctx->bytes_left_in_chunk=CHUNK_SIZE;
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}
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pkt->duration=1;
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return ret;
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}
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AVInputFormat ff_act_demuxer = {
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.name = "act",
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.long_name = "ACT Voice file format",
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.priv_data_size = sizeof(ACTContext),
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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};
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