diff options
Diffstat (limited to 'libavformat/act.c')
| -rw-r--r-- | libavformat/act.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/libavformat/act.c b/libavformat/act.c new file mode 100644 index 0000000..3f223d5 --- /dev/null +++ b/libavformat/act.c @@ -0,0 +1,207 @@ +/* + * 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(pb, st->codec, size); + + /* + 8000Hz (Fine-rec) file format has 10 bytes long + packets with 10ms of sound data in them + */ + if (st->codec->sample_rate != 8000) { + av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codec->sample_rate); + return AVERROR_INVALIDDATA; + } + + st->codec->frame_size=80; + st->codec->channels=1; + avpriv_set_pts_info(st, 64, 1, 100); + + st->codec->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->codec->sample_rate, 1000 * st->codec->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]->codec->sample_rate==8000?10:22; + + + if(s->streams[0]->codec->sample_rate==8000) + ret=av_new_packet(pkt, 10); + else + ret=av_new_packet(pkt, 11); + + if(ret) + return ret; + + if(s->streams[0]->codec->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]->codec->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, +}; |
