150 lines
3.0 KiB
C
150 lines
3.0 KiB
C
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#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;
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i=AV_RL16(&p->buf[0]);
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if(i != SYNC_WORD)
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return 0;
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switch(AV_RL16(&p->buf[2]))
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{
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case 0x40:
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case 0x50:
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return AVPROBE_SCORE_MAX/2;
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default:
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return 0;
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}
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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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ByteIOContext *pb = s->pb;
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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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url_fskip(pb, 2);
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switch(get_le16(pb))
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{
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case 0x40:
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st->codec->bit_rate = 6400;
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break;
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case 0x50:
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st->codec->bit_rate = 8000;
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break;
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}
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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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url_fseek(pb, 0, 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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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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int sync;
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uint16_t* src=buf;
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int i, j, ret;
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if(url_feof(pb))
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return AVERROR(EIO);
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sync = get_le16(pb); // sync word
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packet_size = get_le16(pb) / 8;
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assert(packet_size < 8 * MAX_FRAME_SIZE);
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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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return 0;
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}
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AVInputFormat ff_bit_demuxer = {
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"bit",
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"G.729 BIT file format",
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0,
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probe,
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read_header,
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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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uint16_t b;
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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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"bit",
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"G.729 BIT file format",
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"audio/bit",
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"bit",
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0,
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CODEC_ID_G729,
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CODEC_ID_NONE,
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write_header,
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write_packet,
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.extensions = "bit"
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};
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#endif
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