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135 lines
3.1 KiB
135 lines
3.1 KiB
#include "avformat.h" |
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#include "libavcodec/get_bits.h" |
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#include "libavcodec/put_bits.h" |
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#define MAX_FRAME_SIZE 10 |
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#define SYNC_WORD 0x6b21 |
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#define BIT_0 0x7f |
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#define BIT_1 0x81 |
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static int probe(AVProbeData *p) |
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{ |
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int i, j; |
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if(p->buf_size < 0x40) |
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return 0; |
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for(i=0; i+3<p->buf_size && i< 10*0x50; ){ |
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if(AV_RL16(&p->buf[0]) != SYNC_WORD) |
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return 0; |
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j=AV_RL16(&p->buf[2]); |
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if(j!=0x40 && j!=0x50) |
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return 0; |
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i+=j; |
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} |
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return AVPROBE_SCORE_MAX/2; |
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} |
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static int read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVStream* st; |
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st=av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id=CODEC_ID_G729; |
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st->codec->sample_rate=8000; |
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st->codec->block_align = 16; |
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st->codec->channels=1; |
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av_set_pts_info(st, 64, 1, 100); |
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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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ByteIOContext *pb = s->pb; |
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PutBitContext pbo; |
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uint16_t buf[8 * MAX_FRAME_SIZE + 2]; |
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int packet_size; |
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uint16_t* src=buf; |
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int i, j, ret; |
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int64_t pos= avio_tell(pb); |
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if(url_feof(pb)) |
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return AVERROR_EOF; |
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get_le16(pb); // sync word |
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packet_size = get_le16(pb) / 8; |
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if(packet_size > MAX_FRAME_SIZE) |
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return AVERROR_INVALIDDATA; |
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ret = get_buffer(pb, (uint8_t*)buf, (8 * packet_size) * sizeof(uint16_t)); |
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if(ret<0) |
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return ret; |
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if(ret != 8 * packet_size * sizeof(uint16_t)) |
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return AVERROR(EIO); |
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av_new_packet(pkt, packet_size); |
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init_put_bits(&pbo, pkt->data, packet_size); |
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for(j=0; j < packet_size; j++) |
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for(i=0; i<8;i++) |
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put_bits(&pbo,1, AV_RL16(src++) == BIT_1 ? 1 : 0); |
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flush_put_bits(&pbo); |
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pkt->duration=1; |
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pkt->pos = pos; |
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return 0; |
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} |
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AVInputFormat ff_bit_demuxer = { |
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.name = "bit", |
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.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"), |
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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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.extensions = "bit", |
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}; |
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#ifdef CONFIG_MUXERS |
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static int write_header(AVFormatContext *s) |
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{ |
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AVCodecContext *enc = s->streams[0]->codec; |
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enc->codec_id = CODEC_ID_G729; |
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enc->channels = 1; |
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enc->bits_per_coded_sample = 16; |
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enc->block_align = (enc->bits_per_coded_sample * enc->channels) >> 3; |
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return 0; |
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} |
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static int write_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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ByteIOContext *pb = s->pb; |
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GetBitContext gb; |
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int i; |
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put_le16(pb, SYNC_WORD); |
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put_le16(pb, 8 * 10); |
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init_get_bits(&gb, pkt->data, 8*10); |
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for(i=0; i< 8 * 10; i++) |
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put_le16(pb, get_bits1(&gb) ? BIT_1 : BIT_0); |
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put_flush_packet(pb); |
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return 0; |
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} |
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AVOutputFormat ff_bit_muxer = { |
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.name = "bit", |
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.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"), |
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.mime_type = "audio/bit", |
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.extensions = "bit", |
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.audio_codec = CODEC_ID_G729, |
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.video_codec = CODEC_ID_NONE, |
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.write_header = write_header, |
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.write_packet = write_packet, |
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}; |
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#endif
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