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ffmpeg / libavcodec / oggvorbis.c @ 6f3dda93

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/**
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 * @file oggvorbis.c
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 * Ogg Vorbis codec support via libvorbisenc.
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 * @author Mark Hills <mark@pogo.org.uk>
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 */
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#include <vorbis/vorbisenc.h>
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#include "avcodec.h"
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#undef NDEBUG
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#include <assert.h>
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#define OGGVORBIS_FRAME_SIZE 64
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#define BUFFER_SIZE (1024*64)
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typedef struct OggVorbisContext {
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    vorbis_info vi ;
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    vorbis_dsp_state vd ;
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    vorbis_block vb ;
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    uint8_t buffer[BUFFER_SIZE];
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    int buffer_index;
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    /* decoder */
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    vorbis_comment vc ;
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    ogg_packet op;
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} OggVorbisContext ;
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static int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
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    double cfreq;
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    if(avccontext->flags & CODEC_FLAG_QSCALE) {
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        /* variable bitrate */
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        if(vorbis_encode_setup_vbr(vi, avccontext->channels,
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                avccontext->sample_rate,
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                avccontext->global_quality / (float)FF_QP2LAMBDA))
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            return -1;
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    } else {
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        /* constant bitrate */
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        if(vorbis_encode_setup_managed(vi, avccontext->channels,
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                avccontext->sample_rate, -1, avccontext->bit_rate, -1))
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            return -1;
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#ifdef OGGVORBIS_VBR_BY_ESTIMATE
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        /* variable bitrate by estimate */
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        if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
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            return -1;
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#endif
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    }
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    /* cutoff frequency */
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    if(avccontext->cutoff > 0) {
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        cfreq = avccontext->cutoff / 1000.0;
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        if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
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            return -1;
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    }
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    return vorbis_encode_setup_init(vi);
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}
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static int oggvorbis_encode_init(AVCodecContext *avccontext) {
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    OggVorbisContext *context = avccontext->priv_data ;
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    ogg_packet header, header_comm, header_code;
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    uint8_t *p;
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    unsigned int offset, len;
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    vorbis_info_init(&context->vi) ;
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    if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
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        av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
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        return -1 ;
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    }
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    vorbis_analysis_init(&context->vd, &context->vi) ;
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    vorbis_block_init(&context->vd, &context->vb) ;
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    vorbis_comment_init(&context->vc);
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    vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
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    vorbis_analysis_headerout(&context->vd, &context->vc, &header,
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                                &header_comm, &header_code);
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    len = header.bytes + header_comm.bytes +  header_code.bytes;
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    avccontext->extradata_size= 64 + len + len/255;
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    p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
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    p[0] = 2;
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    offset = 1;
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    offset += av_xiphlacing(&p[offset], header.bytes);
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    offset += av_xiphlacing(&p[offset], header_comm.bytes);
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    memcpy(&p[offset], header.packet, header.bytes);
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    offset += header.bytes;
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    memcpy(&p[offset], header_comm.packet, header_comm.bytes);
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    offset += header_comm.bytes;
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    memcpy(&p[offset], header_code.packet, header_code.bytes);
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    offset += header_code.bytes;
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    avccontext->extradata_size = offset;
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    avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
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/*    vorbis_block_clear(&context->vb);
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    vorbis_dsp_clear(&context->vd);
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    vorbis_info_clear(&context->vi);*/
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    vorbis_comment_clear(&context->vc);
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    avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
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    avccontext->coded_frame= avcodec_alloc_frame();
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    avccontext->coded_frame->key_frame= 1;
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    return 0 ;
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}
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static int oggvorbis_encode_frame(AVCodecContext *avccontext,
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                                  unsigned char *packets,
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                           int buf_size, void *data)
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{
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    OggVorbisContext *context = avccontext->priv_data ;
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    float **buffer ;
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    ogg_packet op ;
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    signed short *audio = data ;
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    int l, samples = data ? OGGVORBIS_FRAME_SIZE : 0;
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    buffer = vorbis_analysis_buffer(&context->vd, samples) ;
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    if(context->vi.channels == 1) {
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        for(l = 0 ; l < samples ; l++)
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            buffer[0][l]=audio[l]/32768.f;
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    } else {
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        for(l = 0 ; l < samples ; l++){
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            buffer[0][l]=audio[l*2]/32768.f;
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            buffer[1][l]=audio[l*2+1]/32768.f;
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        }
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    }
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    vorbis_analysis_wrote(&context->vd, samples) ;
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    while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
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        vorbis_analysis(&context->vb, NULL);
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        vorbis_bitrate_addblock(&context->vb) ;
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        while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
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            if(op.bytes==1) //id love to say this is a hack, bad sadly its not, appearently the end of stream decission is in libogg
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                continue;
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            memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
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            context->buffer_index += sizeof(ogg_packet);
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            memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
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            context->buffer_index += op.bytes;
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//            av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
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        }
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    }
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    l=0;
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    if(context->buffer_index){
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        ogg_packet *op2= (ogg_packet*)context->buffer;
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        op2->packet = context->buffer + sizeof(ogg_packet);
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        l=  op2->bytes;
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        avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
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        //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
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        memcpy(packets, op2->packet, l);
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        context->buffer_index -= l + sizeof(ogg_packet);
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        memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
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//        av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
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    }
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    return l;
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}
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static int oggvorbis_encode_close(AVCodecContext *avccontext) {
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    OggVorbisContext *context = avccontext->priv_data ;
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/*  ogg_packet op ; */
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    vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
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    vorbis_block_clear(&context->vb);
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    vorbis_dsp_clear(&context->vd);
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    vorbis_info_clear(&context->vi);
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    av_freep(&avccontext->coded_frame);
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    av_freep(&avccontext->extradata);
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    return 0 ;
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}
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AVCodec oggvorbis_encoder = {
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    "vorbis",
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    CODEC_TYPE_AUDIO,
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    CODEC_ID_VORBIS,
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    sizeof(OggVorbisContext),
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    oggvorbis_encode_init,
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    oggvorbis_encode_frame,
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    oggvorbis_encode_close,
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    .capabilities= CODEC_CAP_DELAY,
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} ;
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static int oggvorbis_decode_init(AVCodecContext *avccontext) {
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    OggVorbisContext *context = avccontext->priv_data ;
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    uint8_t *p= avccontext->extradata;
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    int i, hsizes[3];
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    unsigned char *headers[3], *extradata = avccontext->extradata;
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    vorbis_info_init(&context->vi) ;
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    vorbis_comment_init(&context->vc) ;
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    if(! avccontext->extradata_size || ! p) {
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        av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
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        return -1;
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    }
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    if(p[0] == 0 && p[1] == 30) {
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        for(i = 0; i < 3; i++){
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            hsizes[i] = *p++ << 8;
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            hsizes[i] += *p++;
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            headers[i] = p;
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            p += hsizes[i];
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        }
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    } else if(*p == 2) {
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        unsigned int offset = 1;
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        p++;
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        for(i=0; i<2; i++) {
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            hsizes[i] = 0;
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            while((*p == 0xFF) && (offset < avccontext->extradata_size)) {
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                hsizes[i] += 0xFF;
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                offset++;
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                p++;
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            }
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            if(offset >= avccontext->extradata_size - 1) {
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                av_log(avccontext, AV_LOG_ERROR,
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                       "vorbis header sizes damaged\n");
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                return -1;
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            }
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            hsizes[i] += *p;
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            offset++;
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            p++;
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        }
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        hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
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#if 0
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        av_log(avccontext, AV_LOG_DEBUG,
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               "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
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               hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
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#endif
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        headers[0] = extradata + offset;
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        headers[1] = extradata + offset + hsizes[0];
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        headers[2] = extradata + offset + hsizes[0] + hsizes[1];
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    } else {
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        av_log(avccontext, AV_LOG_ERROR,
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               "vorbis initial header len is wrong: %d\n", *p);
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        return -1;
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    }
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    for(i=0; i<3; i++){
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        context->op.b_o_s= i==0;
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        context->op.bytes = hsizes[i];
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        context->op.packet = headers[i];
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        if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
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            av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
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            return -1;
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        }
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    }
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    avccontext->channels = context->vi.channels;
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    avccontext->sample_rate = context->vi.rate;
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    avccontext->time_base= (AVRational){1, avccontext->sample_rate};
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    vorbis_synthesis_init(&context->vd, &context->vi);
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    vorbis_block_init(&context->vd, &context->vb);
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    return 0 ;
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}
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static inline int conv(int samples, float **pcm, char *buf, int channels) {
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    int i, j, val ;
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    ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
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    float *mono ;
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    for(i = 0 ; i < channels ; i++){
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        ptr = &data[i];
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        mono = pcm[i] ;
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        for(j = 0 ; j < samples ; j++) {
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            val = mono[j] * 32767.f;
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            if(val > 32767) val = 32767 ;
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            if(val < -32768) val = -32768 ;
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            *ptr = val ;
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            ptr += channels;
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        }
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    }
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    return 0 ;
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}
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static int oggvorbis_decode_frame(AVCodecContext *avccontext,
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                        void *data, int *data_size,
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                        uint8_t *buf, int buf_size)
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{
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    OggVorbisContext *context = avccontext->priv_data ;
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    float **pcm ;
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    ogg_packet *op= &context->op;
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    int samples, total_samples, total_bytes;
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    if(!buf_size){
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    //FIXME flush
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        return 0;
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    }
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    op->packet = buf;
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    op->bytes  = buf_size;
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//    av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %lld %lld %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate);
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/*    for(i=0; i<op->bytes; i++)
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      av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
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    av_log(avccontext, AV_LOG_DEBUG, "\n");*/
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    if(vorbis_synthesis(&context->vb, op) == 0)
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        vorbis_synthesis_blockin(&context->vd, &context->vb) ;
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    total_samples = 0 ;
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    total_bytes = 0 ;
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    while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
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        conv(samples, pcm, (char*)data + total_bytes, context->vi.channels) ;
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        total_bytes += samples * 2 * context->vi.channels ;
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        total_samples += samples ;
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        vorbis_synthesis_read(&context->vd, samples) ;
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    }
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    *data_size = total_bytes ;
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    return buf_size ;
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}
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static int oggvorbis_decode_close(AVCodecContext *avccontext) {
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    OggVorbisContext *context = avccontext->priv_data ;
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    vorbis_info_clear(&context->vi) ;
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    vorbis_comment_clear(&context->vc) ;
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    return 0 ;
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}
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AVCodec oggvorbis_decoder = {
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    "vorbis",
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    CODEC_TYPE_AUDIO,
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    CODEC_ID_VORBIS,
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    sizeof(OggVorbisContext),
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    oggvorbis_decode_init,
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    NULL,
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    oggvorbis_decode_close,
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    oggvorbis_decode_frame,
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    .capabilities= CODEC_CAP_DELAY,
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} ;