vorbis.c

从FFMPEG转换而来的H264解码程序,VC下编译..

                    tmp_vlc_bits[j]=tmp_vlc_bits[i];

#ifdef V_DEBUG
                    av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
                    for(k=0;k<dim;++k) {
                        av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
                    }
                    av_log(vc->avccontext, AV_LOG_INFO, "\n");
#endif

                    ++j;
                }
            }
            if (j!=used_entries) {
                av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
                goto error;
            }
            entries=used_entries;
        }
        else if (codebook_setup->lookup_type>=2) {
            av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
            goto error;
        }

// Initialize VLC table
        if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
            av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
            goto error;
        }
        codebook_setup->maxdepth=0;
        for(t=0;t<entries;++t)
            if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];

        if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
        else                                       codebook_setup->nb_bits=V_NB_BITS;

        codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;

        if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
            av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
            goto error;
        }
    }

    av_free(tmp_vlc_bits);
    av_free(tmp_vlc_codes);
    return 0;

// Error:
error:
    av_free(tmp_vlc_bits);
    av_free(tmp_vlc_codes);
    return 1;
}

// Process time domain transforms part (unused in Vorbis I)

static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
    GetBitContext *gb=&vc->gb;
    uint_fast8_t i;
    uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;

    for(i=0;i<vorbis_time_count;++i) {
        uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);

        AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);

        if (vorbis_tdtransform) {
            av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
            return 1;
        }
    }
    return 0;
}

// Process floors part

static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
                                         vorbis_floor_data *vfu, float *vec);
static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
                                         vorbis_floor_data *vfu, float *vec);
static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
    GetBitContext *gb=&vc->gb;
    uint_fast16_t i,j,k;

    vc->floor_count=get_bits(gb, 6)+1;

    vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));

    for (i=0;i<vc->floor_count;++i) {
        vorbis_floor *floor_setup=&vc->floors[i];

        floor_setup->floor_type=get_bits(gb, 16);

        AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);

        if (floor_setup->floor_type==1) {
            uint_fast8_t maximum_class=0;
            uint_fast8_t rangebits;
            uint_fast16_t floor1_values=2;

            floor_setup->decode=vorbis_floor1_decode;

            floor_setup->data.t1.partitions=get_bits(gb, 5);

            AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);

            for(j=0;j<floor_setup->data.t1.partitions;++j) {
                floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
                if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];

                AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);

            }

            AV_DEBUG(" maximum class %d \n", maximum_class);

            floor_setup->data.t1.maximum_class=maximum_class;

            for(j=0;j<=maximum_class;++j) {
                floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
                floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);

                AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);

                if (floor_setup->data.t1.class_subclasses[j]) {
                    floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);

                    AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
                }

                for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
                    floor_setup->data.t1.subclass_books[j][k]=get_bits(gb, 8)-1;

                    AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
                }
            }

            floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
            floor_setup->data.t1.x_list_dim=2;

            for(j=0;j<floor_setup->data.t1.partitions;++j) {
                floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
            }

            floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
            floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
            floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));
            floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));


            rangebits=get_bits(gb, 4);
            floor_setup->data.t1.x_list[0] = 0;
            floor_setup->data.t1.x_list[1] = (1<<rangebits);

            for(j=0;j<floor_setup->data.t1.partitions;++j) {
                for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
                    floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);

                    AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.x_list[floor1_values]);
                }
            }

// Precalculate order of x coordinates - needed for decode

            for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {
                floor_setup->data.t1.x_list_order[k]=k;
            }

            for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) {   // FIXME optimize sorting ?
                for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {
                    if(floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[k]]>floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[j]]) {
                        uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];
                        floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];
                        floor_setup->data.t1.x_list_order[j]=tmp;
                    }
                }
            }

// Precalculate low and high neighbours

            for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {
                floor_setup->data.t1.low_neighbour[k]=0;
                floor_setup->data.t1.high_neighbour[k]=1;  // correct according to SPEC requirements

                for (j=0;j<k;++j) {
                    if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&
                      (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {
                        floor_setup->data.t1.low_neighbour[k]=j;
                    }
                    if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&
                      (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {
                        floor_setup->data.t1.high_neighbour[k]=j;
                    }
                }
            }
        }
        else if(floor_setup->floor_type==0) {
            uint_fast8_t max_codebook_dim=0;

            floor_setup->decode=vorbis_floor0_decode;

            floor_setup->data.t0.order=get_bits(gb, 8);
            floor_setup->data.t0.rate=get_bits(gb, 16);
            floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
            floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
            /* zero would result in a div by zero later *
             * 2^0 - 1 == 0                             */
            if (floor_setup->data.t0.amplitude_bits == 0) {
              av_log(vc->avccontext, AV_LOG_ERROR,
                     "Floor 0 amplitude bits is 0.\n");
              return 1;
            }
            floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
            floor_setup->data.t0.num_books=get_bits(gb, 4)+1;

            /* allocate mem for booklist */
            floor_setup->data.t0.book_list=
                av_malloc(floor_setup->data.t0.num_books);
            if(!floor_setup->data.t0.book_list) { return 1; }
            /* read book indexes */
            {
                int idx;
                uint_fast8_t book_idx;
                for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
                    book_idx=get_bits(gb, 8);
                    floor_setup->data.t0.book_list[idx]=book_idx;
                    if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
                        max_codebook_dim=vc->codebooks[book_idx].dimensions;

                    if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)
                        return 1;
                }
            }

            create_map( vc, i );

            /* allocate mem for lsp coefficients */
            {
                /* codebook dim is for padding if codebook dim doesn't *
                 * divide order+1 then we need to read more data       */
                floor_setup->data.t0.lsp=
                    av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
                              * sizeof(float));
                if(!floor_setup->data.t0.lsp) { return 1; }
            }

#ifdef V_DEBUG /* debug output parsed headers */
            AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
            AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
            AV_DEBUG("floor0 bark map size: %u\n",
              floor_setup->data.t0.bark_map_size);
            AV_DEBUG("floor0 amplitude bits: %u\n",
              floor_setup->data.t0.amplitude_bits);
            AV_DEBUG("floor0 amplitude offset: %u\n",
              floor_setup->data.t0.amplitude_offset);
            AV_DEBUG("floor0 number of books: %u\n",
              floor_setup->data.t0.num_books);
            AV_DEBUG("floor0 book list pointer: %p\n",
              floor_setup->data.t0.book_list);
            {
              int idx;
              for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
                AV_DEBUG( "  Book %d: %u\n",
                  idx+1,
                  floor_setup->data.t0.book_list[idx] );
              }
            }
#endif
        }
        else {
            av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
            return 1;
        }
    }
    return 0;
}

// Process residues part

static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
    GetBitContext *gb=&vc->gb;
    uint_fast8_t i, j, k;

    vc->residue_count=get_bits(gb, 6)+1;
    vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));

    AV_DEBUG(" There are %d residues. \n", vc->residue_count);

    for(i=0;i<vc->residue_count;++i) {
        vorbis_residue *res_setup=&vc->residues[i];
        uint_fast8_t cascade[64];
        uint_fast8_t high_bits;
        uint_fast8_t low_bits;

        res_setup->type=get_bits(gb, 16);

        AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);

        res_setup->begin=get_bits(gb, 24);
        res_setup->end=get_bits(gb, 24);
        res_setup->partition_size=get_bits(gb, 24)+1;
        res_setup->classifications=get_bits(gb, 6)+1;
        res_setup->classbook=get_bits(gb, 8);

        AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
          res_setup->classifications, res_setup->classbook);

        for(j=0;j<res_setup->classifications;++j) {
            high_bits=0;
            low_bits=get_bits(gb, 3);
            if (get_bits1(gb)) {
                high_bits=get_bits(gb, 5);
            }
            cascade[j]=(high_bits<<3)+low_bits;

            AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
        }

        res_setup->maxpass=0;
        for(j=0;j<res_setup->classifications;++j) {
            for(k=0;k<8;++k) {
                if (cascade[j]&(1<<k)) {
                        res_setup->books[j][k]=get_bits(gb, 8);

                    AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);

                    if (k>res_setup->maxpass) {
                        res_setup->maxpass=k;
                    }
                } else {
                    res_setup->books[j][k]=-1;
                }
            }
        }
    }
    return 0;
}

// Process mappings part

static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
    GetBitContext *gb=&vc->gb;
    uint_fast8_t i, j;

    vc->mapping_count=get_bits(gb, 6)+1;
    vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));

    AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);

    for(i=0;i<vc->mapping_count;++i) {
        vorbis_mapping *mapping_setup=&vc->mappings[i];

        if (get_bits(gb, 16)) {
            av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
            return 1;
        }
        if (get_bits1(gb)) {
            mapping_setup->submaps=get_bits(gb, 4)+1;
        } else {
            mapping_setup->submaps=1;
        }