static void mpegvideo_extract_headers(AVCodecParserContext *s,
                                      AVCodecContext *avctx,
                                      const uint8_t *buf, int buf_size)
{
    ParseContext1 *pc = s->priv_data;
    const uint8_t *buf_end;
    const uint8_t *buf_start= buf;
    uint32_t start_code;
    int frame_rate_index, ext_type, bytes_left;
    int frame_rate_ext_n, frame_rate_ext_d;
    int picture_structure, top_field_first, repeat_first_field, progressive_frame;
    int horiz_size_ext, vert_size_ext, bit_rate_ext;
//FIXME replace the crap with get_bits()
    s->repeat_pict = 0;
    buf_end = buf + buf_size;
    while (buf < buf_end) {
        start_code= -1;
        buf= ff_find_start_code(buf, buf_end, &start_code);
        bytes_left = buf_end - buf;
        switch(start_code) {
        case PICTURE_START_CODE:
            if (bytes_left >= 2) {
                s->pict_type = (buf[1] >> 3) & 7;
            }
            break;
        case SEQ_START_CODE:
            if (bytes_left >= 7) {
                pc->width  = (buf[0] << 4) | (buf[1] >> 4);
                pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
                avcodec_set_dimensions(avctx, pc->width, pc->height);
                frame_rate_index = buf[3] & 0xf;
                pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
                pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
                avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
                avctx->codec_id = CODEC_ID_MPEG1VIDEO;
                avctx->sub_id = 1;
            }
            break;
        case EXT_START_CODE:
            if (bytes_left >= 1) {
                ext_type = (buf[0] >> 4);
                switch(ext_type) {
                case 0x1: /* sequence extension */
                    if (bytes_left >= 6) {
                        horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
                        vert_size_ext = (buf[2] >> 5) & 3;
                        bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
                        frame_rate_ext_n = (buf[5] >> 5) & 3;
                        frame_rate_ext_d = (buf[5] & 0x1f);
                        pc->progressive_sequence = buf[1] & (1 << 3);
                        avctx->has_b_frames= !(buf[5] >> 7);
                        pc->width  |=(horiz_size_ext << 12);
                        pc->height |=( vert_size_ext << 12);
                        avctx->bit_rate += (bit_rate_ext << 18) * 400;
                        avcodec_set_dimensions(avctx, pc->width, pc->height);
                        avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
                        avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
                        avctx->codec_id = CODEC_ID_MPEG2VIDEO;
                        avctx->sub_id = 2; /* forces MPEG2 */
                    }
                    break;
                case 0x8: /* picture coding extension */
                    if (bytes_left >= 5) {
                        picture_structure = buf[2]&3;
                        top_field_first = buf[3] & (1 << 7);
                        repeat_first_field = buf[3] & (1 << 1);
                        progressive_frame = buf[4] & (1 << 7);
                        /* check if we must repeat the frame */
                        if (repeat_first_field) {
                            if (pc->progressive_sequence) {
                                if (top_field_first)
                                    s->repeat_pict = 4;
                                else
                                    s->repeat_pict = 2;
                            } else if (progressive_frame) {
                                s->repeat_pict = 1;
                            }
                        }
                    }
                    break;
                }
            }
            break;
        case -1:
            goto the_end;
        default:
            /* we stop parsing when we encounter a slice. It ensures
               that this function takes a negligible amount of time */
            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE)
                goto the_end;
            break;
        }
    }
 the_end: ;
}
static void mpegvideo_extract_headers(AVCodecParserContext *s,
                                      AVCodecContext *avctx,
                                      const uint8_t *buf, int buf_size)
{
    ParseContext1 *pc = s->priv_data;
    const uint8_t *buf_end;
    const uint8_t *buf_start= buf;
    uint32_t start_code;
    int frame_rate_index, ext_type, bytes_left;
    int frame_rate_ext_n, frame_rate_ext_d;
    int picture_structure, top_field_first, repeat_first_field, progressive_frame;
    int horiz_size_ext, vert_size_ext, bit_rate_ext;

    s->repeat_pict = 0;
    buf_end = buf + buf_size;
    while (buf < buf_end) {
        start_code= -1;
        buf= ff_find_start_code(buf, buf_end, &start_code);
        bytes_left = buf_end - buf;
        switch(start_code) {
        case PICTURE_START_CODE:
            if (bytes_left >= 2) {
                s->pict_type = (buf[1] >> 3) & 7;
            }
            break;
        case SEQ_START_CODE:
            if (bytes_left >= 7) {
                pc->width  = (buf[0] << 4) | (buf[1] >> 4);
                pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
                avcodec_set_dimensions(avctx, pc->width, pc->height);
                frame_rate_index = buf[3] & 0xf;
                pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
                pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
                avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
                avctx->codec_id = CODEC_ID_MPEG1VIDEO;
                avctx->sub_id = 1;
            }
            break;
        case EXT_START_CODE:
            if (bytes_left >= 1) {
                ext_type = (buf[0] >> 4);
                switch(ext_type) {
                case 0x1: 
                    if (bytes_left >= 6) {
                        horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
                        vert_size_ext = (buf[2] >> 5) & 3;
                        bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
                        frame_rate_ext_n = (buf[5] >> 5) & 3;
                        frame_rate_ext_d = (buf[5] & 0x1f);
                        pc->progressive_sequence = buf[1] & (1 << 3);
                        avctx->has_b_frames= !(buf[5] >> 7);
                        pc->width  |=(horiz_size_ext << 12);
                        pc->height |=( vert_size_ext << 12);
                        avctx->bit_rate += (bit_rate_ext << 18) * 400;
                        avcodec_set_dimensions(avctx, pc->width, pc->height);
                        avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
                        avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
                        avctx->codec_id = CODEC_ID_MPEG2VIDEO;
                        avctx->sub_id = 2; 
                    }
                    break;
                case 0x8: 
                    if (bytes_left >= 5) {
                        picture_structure = buf[2]&3;
                        top_field_first = buf[3] & (1 << 7);
                        repeat_first_field = buf[3] & (1 << 1);
                        progressive_frame = buf[4] & (1 << 7);
                        
                        if (repeat_first_field) {
                            if (pc->progressive_sequence) {
                                if (top_field_first)
                                    s->repeat_pict = 4;
                                else
                                    s->repeat_pict = 2;
                            } else if (progressive_frame) {
                                s->repeat_pict = 1;
                            }
                        }
                    }
                    break;
                }
            }
            break;
        case -1:
            goto the_end;
        default:
            

            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE)
                goto the_end;
            break;
        }
    }
 the_end: ;
}
static void FUNC_0(AVCodecParserContext *VAR_0,
                                      AVCodecContext *VAR_1,
                                      const uint8_t *VAR_2, int VAR_3)
{
    ParseContext1 *pc = VAR_0->priv_data;
    const uint8_t *VAR_4;
    const uint8_t *VAR_5= VAR_2;
    uint32_t start_code;
    int VAR_6, VAR_7, VAR_8;
    int VAR_9, VAR_10;
    int VAR_11, VAR_12, VAR_13, VAR_14;
    int VAR_15, VAR_16, VAR_17;

    VAR_0->repeat_pict = 0;
    VAR_4 = VAR_2 + VAR_3;
    while (VAR_2 < VAR_4) {
        start_code= -1;
        VAR_2= ff_find_start_code(VAR_2, VAR_4, &start_code);
        VAR_8 = VAR_4 - VAR_2;
        switch(start_code) {
        case PICTURE_START_CODE:
            if (VAR_8 >= 2) {
                VAR_0->pict_type = (VAR_2[1] >> 3) & 7;
            }
            break;
        case SEQ_START_CODE:
            if (VAR_8 >= 7) {
                pc->width  = (VAR_2[0] << 4) | (VAR_2[1] >> 4);
                pc->height = ((VAR_2[1] & 0x0f) << 8) | VAR_2[2];
                avcodec_set_dimensions(VAR_1, pc->width, pc->height);
                VAR_6 = VAR_2[3] & 0xf;
                pc->frame_rate.den = VAR_1->time_base.den = ff_frame_rate_tab[VAR_6].num;
                pc->frame_rate.num = VAR_1->time_base.num = ff_frame_rate_tab[VAR_6].den;
                VAR_1->bit_rate = ((VAR_2[4]<<10) | (VAR_2[5]<<2) | (VAR_2[6]>>6))*400;
                VAR_1->codec_id = CODEC_ID_MPEG1VIDEO;
                VAR_1->sub_id = 1;
            }
            break;
        case EXT_START_CODE:
            if (VAR_8 >= 1) {
                VAR_7 = (VAR_2[0] >> 4);
                switch(VAR_7) {
                case 0x1: 
                    if (VAR_8 >= 6) {
                        VAR_15 = ((VAR_2[1] & 1) << 1) | (VAR_2[2] >> 7);
                        VAR_16 = (VAR_2[2] >> 5) & 3;
                        VAR_17 = ((VAR_2[2] & 0x1F)<<7) | (VAR_2[3]>>1);
                        VAR_9 = (VAR_2[5] >> 5) & 3;
                        VAR_10 = (VAR_2[5] & 0x1f);
                        pc->progressive_sequence = VAR_2[1] & (1 << 3);
                        VAR_1->has_b_frames= !(VAR_2[5] >> 7);
                        pc->width  |=(VAR_15 << 12);
                        pc->height |=( VAR_16 << 12);
                        VAR_1->bit_rate += (VAR_17 << 18) * 400;
                        avcodec_set_dimensions(VAR_1, pc->width, pc->height);
                        VAR_1->time_base.den = pc->frame_rate.den * (VAR_9 + 1);
                        VAR_1->time_base.num = pc->frame_rate.num * (VAR_10 + 1);
                        VAR_1->codec_id = CODEC_ID_MPEG2VIDEO;
                        VAR_1->sub_id = 2; 
                    }
                    break;
                case 0x8: 
                    if (VAR_8 >= 5) {
                        VAR_11 = VAR_2[2]&3;
                        VAR_12 = VAR_2[3] & (1 << 7);
                        VAR_13 = VAR_2[3] & (1 << 1);
                        VAR_14 = VAR_2[4] & (1 << 7);
                        
                        if (VAR_13) {
                            if (pc->progressive_sequence) {
                                if (VAR_12)
                                    VAR_0->repeat_pict = 4;
                                else
                                    VAR_0->repeat_pict = 2;
                            } else if (VAR_14) {
                                VAR_0->repeat_pict = 1;
                            }
                        }
                    }
                    break;
                }
            }
            break;
        case -1:
            goto the_end;
        default:
            

            if (start_code >= SLICE_MIN_START_CODE &&
                start_code <= SLICE_MAX_START_CODE)
                goto the_end;
            break;
        }
    }
 the_end: ;
}
static void FUNC_0(AVCodecParserContext *VAR_0,
AVCodecContext *VAR_1,
const uint8_t *VAR_2, int VAR_3)
{ ParseContext1 *pc = VAR_0->priv_data; const uint8_t *VAR_4; const uint8_t *VAR_5= VAR_2; uint32_t start_code; int VAR_6, VAR_7, VAR_8; int VAR_9, VAR_10; int VAR_11, VAR_12, VAR_13, VAR_14; int VAR_15, VAR_16, VAR_17; VAR_0->repeat_pict = 0; VAR_4 = VAR_2 + VAR_3; while (VAR_2 < VAR_4) { start_code= -1; VAR_2= ff_find_start_code(VAR_2, VAR_4, &start_code); VAR_8 = VAR_4 - VAR_2; switch(start_code) { case PICTURE_START_CODE:
if (VAR_8 >= 2) { VAR_0->pict_type = (VAR_2[1] >> 3) & 7; } break; case SEQ_START_CODE:
if (VAR_8 >= 7) { pc->width  = (VAR_2[0] << 4) | (VAR_2[1] >> 4); pc->height = ((VAR_2[1] & 0x0f) << 8) | VAR_2[2]; avcodec_set_dimensions(VAR_1, pc->width, pc->height); VAR_6 = VAR_2[3] & 0xf; pc->frame_rate.den = VAR_1->time_base.den = ff_frame_rate_tab[VAR_6].num; pc->frame_rate.num = VAR_1->time_base.num = ff_frame_rate_tab[VAR_6].den; VAR_1->bit_rate = ((VAR_2[4]<<10) | (VAR_2[5]<<2) | (VAR_2[6]>>6))*400; VAR_1->codec_id = CODEC_ID_MPEG1VIDEO; VAR_1->sub_id = 1; } break; case EXT_START_CODE:
if (VAR_8 >= 1) { VAR_7 = (VAR_2[0] >> 4); switch(VAR_7) { case 0x1:
if (VAR_8 >= 6) { VAR_15 = ((VAR_2[1] & 1) << 1) | (VAR_2[2] >> 7); VAR_16 = (VAR_2[2] >> 5) & 3; VAR_17 = ((VAR_2[2] & 0x1F)<<7) | (VAR_2[3]>>1); VAR_9 = (VAR_2[5] >> 5) & 3; VAR_10 = (VAR_2[5] & 0x1f); pc->progressive_sequence = VAR_2[1] & (1 << 3); VAR_1->has_b_frames= !(VAR_2[5] >> 7); pc->width  |=(VAR_15 << 12); pc->height |=( VAR_16 << 12); VAR_1->bit_rate += (VAR_17 << 18) * 400; avcodec_set_dimensions(VAR_1, pc->width, pc->height); VAR_1->time_base.den = pc->frame_rate.den * (VAR_9 + 1); VAR_1->time_base.num = pc->frame_rate.num * (VAR_10 + 1); VAR_1->codec_id = CODEC_ID_MPEG2VIDEO; VAR_1->sub_id = 2; } break; case 0x8:
if (VAR_8 >= 5) { VAR_11 = VAR_2[2]&3; VAR_12 = VAR_2[3] & (1 << 7); VAR_13 = VAR_2[3] & (1 << 1); VAR_14 = VAR_2[4] & (1 << 7); if (VAR_13) { if (pc->progressive_sequence) { if (VAR_12)
VAR_0->repeat_pict = 4; else
VAR_0->repeat_pict = 2; } else if (VAR_14) { VAR_0->repeat_pict = 1; } } } break; } } break; case -1:
goto the_end; default:
if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE)
goto the_end; break; } } the_end: ; }